import { TypeORMError } from "../../error";
import { QueryRunnerAlreadyReleasedError } from "../../error/QueryRunnerAlreadyReleasedError";
import { TransactionNotStartedError } from "../../error/TransactionNotStartedError";
import { BaseQueryRunner } from "../../query-runner/BaseQueryRunner";
import { QueryResult } from "../../query-runner/QueryResult";
import { Table } from "../../schema-builder/table/Table";
import { TableColumn } from "../../schema-builder/table/TableColumn";
import { TableForeignKey } from "../../schema-builder/table/TableForeignKey";
import { TableIndex } from "../../schema-builder/table/TableIndex";
import { TableUnique } from "../../schema-builder/table/TableUnique";
import { View } from "../../schema-builder/view/View";
import { Broadcaster } from "../../subscriber/Broadcaster";
import { InstanceChecker } from "../../util/InstanceChecker";
import { OrmUtils } from "../../util/OrmUtils";
import { Query } from "../Query";
import { MetadataTableType } from "../types/MetadataTableType";
/**
 * Runs queries on a single mysql database connection.
 */
export class AuroraMysqlQueryRunner extends BaseQueryRunner {
    // -------------------------------------------------------------------------
    // Constructor
    // -------------------------------------------------------------------------
    constructor(driver, client) {
        super();
        this.driver = driver;
        this.connection = driver.connection;
        this.client = client;
        this.broadcaster = new Broadcaster(this);
    }
    // -------------------------------------------------------------------------
    // Public Methods
    // -------------------------------------------------------------------------
    /**
     * Creates/uses database connection from the connection pool to perform further operations.
     * Returns obtained database connection.
     */
    async connect() {
        return {};
    }
    /**
     * Releases used database connection.
     * You cannot use query runner methods once its released.
     */
    release() {
        this.isReleased = true;
        if (this.databaseConnection)
            this.databaseConnection.release();
        return Promise.resolve();
    }
    /**
     * Starts transaction on the current connection.
     */
    async startTransaction(isolationLevel) {
        this.isTransactionActive = true;
        try {
            await this.broadcaster.broadcast("BeforeTransactionStart");
        }
        catch (err) {
            this.isTransactionActive = false;
            throw err;
        }
        if (this.transactionDepth === 0) {
            await this.client.startTransaction();
        }
        else {
            await this.query(`SAVEPOINT typeorm_${this.transactionDepth}`);
        }
        this.transactionDepth += 1;
        await this.broadcaster.broadcast("AfterTransactionStart");
    }
    /**
     * Commits transaction.
     * Error will be thrown if transaction was not started.
     */
    async commitTransaction() {
        if (!this.isTransactionActive)
            throw new TransactionNotStartedError();
        await this.broadcaster.broadcast("BeforeTransactionCommit");
        if (this.transactionDepth > 1) {
            await this.query(`RELEASE SAVEPOINT typeorm_${this.transactionDepth - 1}`);
        }
        else {
            await this.client.commitTransaction();
            this.isTransactionActive = false;
        }
        this.transactionDepth -= 1;
        await this.broadcaster.broadcast("AfterTransactionCommit");
    }
    /**
     * Rollbacks transaction.
     * Error will be thrown if transaction was not started.
     */
    async rollbackTransaction() {
        if (!this.isTransactionActive)
            throw new TransactionNotStartedError();
        await this.broadcaster.broadcast("BeforeTransactionRollback");
        if (this.transactionDepth > 1) {
            await this.query(`ROLLBACK TO SAVEPOINT typeorm_${this.transactionDepth - 1}`);
        }
        else {
            await this.client.rollbackTransaction();
            this.isTransactionActive = false;
        }
        this.transactionDepth -= 1;
        await this.broadcaster.broadcast("AfterTransactionRollback");
    }
    /**
     * Executes a raw SQL query.
     */
    async query(query, parameters, useStructuredResult = false) {
        if (this.isReleased)
            throw new QueryRunnerAlreadyReleasedError();
        const raw = await this.client.query(query, parameters);
        const result = new QueryResult();
        result.raw = raw;
        if (raw?.hasOwnProperty("records") && Array.isArray(raw.records)) {
            result.records = raw.records;
        }
        if (raw?.hasOwnProperty("numberOfRecordsUpdated")) {
            result.affected = raw.numberOfRecordsUpdated;
        }
        if (!useStructuredResult) {
            return result.raw;
        }
        return result;
    }
    /**
     * Returns raw data stream.
     */
    stream(query, parameters, onEnd, onError) {
        if (this.isReleased)
            throw new QueryRunnerAlreadyReleasedError();
        return new Promise(async (ok, fail) => {
            try {
                const databaseConnection = await this.connect();
                const stream = databaseConnection.query(query, parameters);
                if (onEnd)
                    stream.on("end", onEnd);
                if (onError)
                    stream.on("error", onError);
                ok(stream);
            }
            catch (err) {
                fail(err);
            }
        });
    }
    /**
     * Returns all available database names including system databases.
     */
    async getDatabases() {
        return Promise.resolve([]);
    }
    /**
     * Returns all available schema names including system schemas.
     * If database parameter specified, returns schemas of that database.
     */
    async getSchemas(database) {
        throw new TypeORMError(`MySql driver does not support table schemas`);
    }
    /**
     * Checks if database with the given name exist.
     */
    async hasDatabase(database) {
        const result = await this.query(`SELECT * FROM \`INFORMATION_SCHEMA\`.\`SCHEMATA\` WHERE \`SCHEMA_NAME\` = '${database}'`);
        return result.length ? true : false;
    }
    /**
     * Loads currently using database
     */
    async getCurrentDatabase() {
        const query = await this.query(`SELECT DATABASE() AS \`db_name\``);
        return query[0]["db_name"];
    }
    /**
     * Checks if schema with the given name exist.
     */
    async hasSchema(schema) {
        throw new TypeORMError(`MySql driver does not support table schemas`);
    }
    /**
     * Loads currently using database schema
     */
    async getCurrentSchema() {
        const query = await this.query(`SELECT SCHEMA() AS \`schema_name\``);
        return query[0]["schema_name"];
    }
    /**
     * Checks if table with the given name exist in the database.
     */
    async hasTable(tableOrName) {
        const parsedTableName = this.driver.parseTableName(tableOrName);
        const sql = `SELECT * FROM \`INFORMATION_SCHEMA\`.\`COLUMNS\` WHERE \`TABLE_SCHEMA\` = '${parsedTableName.database}' AND \`TABLE_NAME\` = '${parsedTableName.tableName}'`;
        const result = await this.query(sql);
        return result.length ? true : false;
    }
    /**
     * Checks if column with the given name exist in the given table.
     */
    async hasColumn(tableOrName, column) {
        const parsedTableName = this.driver.parseTableName(tableOrName);
        const columnName = InstanceChecker.isTableColumn(column)
            ? column.name
            : column;
        const sql = `SELECT * FROM \`INFORMATION_SCHEMA\`.\`COLUMNS\` WHERE \`TABLE_SCHEMA\` = '${parsedTableName.database}' AND \`TABLE_NAME\` = '${parsedTableName.tableName}' AND \`COLUMN_NAME\` = '${columnName}'`;
        const result = await this.query(sql);
        return result.length ? true : false;
    }
    /**
     * Creates a new database.
     */
    async createDatabase(database, ifNotExist) {
        const up = ifNotExist
            ? `CREATE DATABASE IF NOT EXISTS \`${database}\``
            : `CREATE DATABASE \`${database}\``;
        const down = `DROP DATABASE \`${database}\``;
        await this.executeQueries(new Query(up), new Query(down));
    }
    /**
     * Drops database.
     */
    async dropDatabase(database, ifExist) {
        const up = ifExist
            ? `DROP DATABASE IF EXISTS \`${database}\``
            : `DROP DATABASE \`${database}\``;
        const down = `CREATE DATABASE \`${database}\``;
        await this.executeQueries(new Query(up), new Query(down));
    }
    /**
     * Creates a new table schema.
     */
    async createSchema(schemaPath, ifNotExist) {
        throw new TypeORMError(`Schema create queries are not supported by MySql driver.`);
    }
    /**
     * Drops table schema.
     */
    async dropSchema(schemaPath, ifExist) {
        throw new TypeORMError(`Schema drop queries are not supported by MySql driver.`);
    }
    /**
     * Creates a new table.
     */
    async createTable(table, ifNotExist = false, createForeignKeys = true) {
        if (ifNotExist) {
            const isTableExist = await this.hasTable(table);
            if (isTableExist)
                return Promise.resolve();
        }
        const upQueries = [];
        const downQueries = [];
        upQueries.push(this.createTableSql(table, createForeignKeys));
        downQueries.push(this.dropTableSql(table));
        // we must first drop indices, than drop foreign keys, because drop queries runs in reversed order
        // and foreign keys will be dropped first as indices. This order is very important, because we can't drop index
        // if it related to the foreign key.
        // createTable does not need separate method to create indices, because it create indices in the same query with table creation.
        table.indices.forEach((index) => downQueries.push(this.dropIndexSql(table, index)));
        // if createForeignKeys is true, we must drop created foreign keys in down query.
        // createTable does not need separate method to create foreign keys, because it create fk's in the same query with table creation.
        if (createForeignKeys)
            table.foreignKeys.forEach((foreignKey) => downQueries.push(this.dropForeignKeySql(table, foreignKey)));
        return this.executeQueries(upQueries, downQueries);
    }
    /**
     * Drop the table.
     */
    async dropTable(target, ifExist, dropForeignKeys = true) {
        // It needs because if table does not exist and dropForeignKeys or dropIndices is true, we don't need
        // to perform drop queries for foreign keys and indices.
        if (ifExist) {
            const isTableExist = await this.hasTable(target);
            if (!isTableExist)
                return Promise.resolve();
        }
        // if dropTable called with dropForeignKeys = true, we must create foreign keys in down query.
        const createForeignKeys = dropForeignKeys;
        const tablePath = this.getTablePath(target);
        const table = await this.getCachedTable(tablePath);
        const upQueries = [];
        const downQueries = [];
        if (dropForeignKeys)
            table.foreignKeys.forEach((foreignKey) => upQueries.push(this.dropForeignKeySql(table, foreignKey)));
        table.indices.forEach((index) => upQueries.push(this.dropIndexSql(table, index)));
        upQueries.push(this.dropTableSql(table));
        downQueries.push(this.createTableSql(table, createForeignKeys));
        await this.executeQueries(upQueries, downQueries);
    }
    /**
     * Creates a new view.
     */
    async createView(view, syncWithMetadata = false) {
        const upQueries = [];
        const downQueries = [];
        upQueries.push(this.createViewSql(view));
        if (syncWithMetadata)
            upQueries.push(await this.insertViewDefinitionSql(view));
        downQueries.push(this.dropViewSql(view));
        if (syncWithMetadata)
            downQueries.push(await this.deleteViewDefinitionSql(view));
        await this.executeQueries(upQueries, downQueries);
    }
    /**
     * Drops the view.
     */
    async dropView(target) {
        const viewName = InstanceChecker.isView(target) ? target.name : target;
        const view = await this.getCachedView(viewName);
        const upQueries = [];
        const downQueries = [];
        upQueries.push(await this.deleteViewDefinitionSql(view));
        upQueries.push(this.dropViewSql(view));
        downQueries.push(await this.insertViewDefinitionSql(view));
        downQueries.push(this.createViewSql(view));
        await this.executeQueries(upQueries, downQueries);
    }
    /**
     * Renames a table.
     */
    async renameTable(oldTableOrName, newTableName) {
        const upQueries = [];
        const downQueries = [];
        const oldTable = InstanceChecker.isTable(oldTableOrName)
            ? oldTableOrName
            : await this.getCachedTable(oldTableOrName);
        const newTable = oldTable.clone();
        const { database } = this.driver.parseTableName(oldTable);
        newTable.name = database ? `${database}.${newTableName}` : newTableName;
        // rename table
        upQueries.push(new Query(`RENAME TABLE ${this.escapePath(oldTable)} TO ${this.escapePath(newTable)}`));
        downQueries.push(new Query(`RENAME TABLE ${this.escapePath(newTable)} TO ${this.escapePath(oldTable)}`));
        // rename index constraints
        newTable.indices.forEach((index) => {
            // build new constraint name
            const columnNames = index.columnNames
                .map((column) => `\`${column}\``)
                .join(", ");
            const newIndexName = this.connection.namingStrategy.indexName(newTable, index.columnNames, index.where);
            // build queries
            let indexType = "";
            if (index.isUnique)
                indexType += "UNIQUE ";
            if (index.isSpatial)
                indexType += "SPATIAL ";
            if (index.isFulltext)
                indexType += "FULLTEXT ";
            upQueries.push(new Query(`ALTER TABLE ${this.escapePath(newTable)} DROP INDEX \`${index.name}\`, ADD ${indexType}INDEX \`${newIndexName}\` (${columnNames})`));
            downQueries.push(new Query(`ALTER TABLE ${this.escapePath(newTable)} DROP INDEX \`${newIndexName}\`, ADD ${indexType}INDEX \`${index.name}\` (${columnNames})`));
            // replace constraint name
            index.name = newIndexName;
        });
        // rename foreign key constraint
        newTable.foreignKeys.forEach((foreignKey) => {
            // build new constraint name
            const columnNames = foreignKey.columnNames
                .map((column) => `\`${column}\``)
                .join(", ");
            const referencedColumnNames = foreignKey.referencedColumnNames
                .map((column) => `\`${column}\``)
                .join(",");
            const newForeignKeyName = this.connection.namingStrategy.foreignKeyName(newTable, foreignKey.columnNames);
            // build queries
            let up = `ALTER TABLE ${this.escapePath(newTable)} DROP FOREIGN KEY \`${foreignKey.name}\`, ADD CONSTRAINT \`${newForeignKeyName}\` FOREIGN KEY (${columnNames}) ` +
                `REFERENCES ${this.escapePath(this.getTablePath(foreignKey))}(${referencedColumnNames})`;
            if (foreignKey.onDelete)
                up += ` ON DELETE ${foreignKey.onDelete}`;
            if (foreignKey.onUpdate)
                up += ` ON UPDATE ${foreignKey.onUpdate}`;
            let down = `ALTER TABLE ${this.escapePath(newTable)} DROP FOREIGN KEY \`${newForeignKeyName}\`, ADD CONSTRAINT \`${foreignKey.name}\` FOREIGN KEY (${columnNames}) ` +
                `REFERENCES ${this.escapePath(this.getTablePath(foreignKey))}(${referencedColumnNames})`;
            if (foreignKey.onDelete)
                down += ` ON DELETE ${foreignKey.onDelete}`;
            if (foreignKey.onUpdate)
                down += ` ON UPDATE ${foreignKey.onUpdate}`;
            upQueries.push(new Query(up));
            downQueries.push(new Query(down));
            // replace constraint name
            foreignKey.name = newForeignKeyName;
        });
        await this.executeQueries(upQueries, downQueries);
        // rename old table and replace it in cached tabled;
        oldTable.name = newTable.name;
        this.replaceCachedTable(oldTable, newTable);
    }
    /**
     * Creates a new column from the column in the table.
     */
    async addColumn(tableOrName, column) {
        const table = InstanceChecker.isTable(tableOrName)
            ? tableOrName
            : await this.getCachedTable(tableOrName);
        const clonedTable = table.clone();
        const upQueries = [];
        const downQueries = [];
        const skipColumnLevelPrimary = clonedTable.primaryColumns.length > 0;
        upQueries.push(new Query(`ALTER TABLE ${this.escapePath(table)} ADD ${this.buildCreateColumnSql(column, skipColumnLevelPrimary, false)}`));
        downQueries.push(new Query(`ALTER TABLE ${this.escapePath(table)} DROP COLUMN \`${column.name}\``));
        // create or update primary key constraint
        if (column.isPrimary && skipColumnLevelPrimary) {
            // if we already have generated column, we must temporary drop AUTO_INCREMENT property.
            const generatedColumn = clonedTable.columns.find((column) => column.isGenerated &&
                column.generationStrategy === "increment");
            if (generatedColumn) {
                const nonGeneratedColumn = generatedColumn.clone();
                nonGeneratedColumn.isGenerated = false;
                nonGeneratedColumn.generationStrategy = undefined;
                upQueries.push(new Query(`ALTER TABLE ${this.escapePath(table)} CHANGE \`${column.name}\` ${this.buildCreateColumnSql(nonGeneratedColumn, true)}`));
                downQueries.push(new Query(`ALTER TABLE ${this.escapePath(table)} CHANGE \`${nonGeneratedColumn.name}\` ${this.buildCreateColumnSql(column, true)}`));
            }
            const primaryColumns = clonedTable.primaryColumns;
            let columnNames = primaryColumns
                .map((column) => `\`${column.name}\``)
                .join(", ");
            upQueries.push(new Query(`ALTER TABLE ${this.escapePath(table)} DROP PRIMARY KEY`));
            downQueries.push(new Query(`ALTER TABLE ${this.escapePath(table)} ADD PRIMARY KEY (${columnNames})`));
            primaryColumns.push(column);
            columnNames = primaryColumns
                .map((column) => `\`${column.name}\``)
                .join(", ");
            upQueries.push(new Query(`ALTER TABLE ${this.escapePath(table)} ADD PRIMARY KEY (${columnNames})`));
            downQueries.push(new Query(`ALTER TABLE ${this.escapePath(table)} DROP PRIMARY KEY`));
            // if we previously dropped AUTO_INCREMENT property, we must bring it back
            if (generatedColumn) {
                const nonGeneratedColumn = generatedColumn.clone();
                nonGeneratedColumn.isGenerated = false;
                nonGeneratedColumn.generationStrategy = undefined;
                upQueries.push(new Query(`ALTER TABLE ${this.escapePath(table)} CHANGE \`${nonGeneratedColumn.name}\` ${this.buildCreateColumnSql(column, true)}`));
                downQueries.push(new Query(`ALTER TABLE ${this.escapePath(table)} CHANGE \`${column.name}\` ${this.buildCreateColumnSql(nonGeneratedColumn, true)}`));
            }
        }
        // create column index
        const columnIndex = clonedTable.indices.find((index) => index.columnNames.length === 1 &&
            index.columnNames[0] === column.name);
        if (columnIndex) {
            upQueries.push(this.createIndexSql(table, columnIndex));
            downQueries.push(this.dropIndexSql(table, columnIndex));
        }
        else if (column.isUnique) {
            const uniqueIndex = new TableIndex({
                name: this.connection.namingStrategy.indexName(table, [
                    column.name,
                ]),
                columnNames: [column.name],
                isUnique: true,
            });
            clonedTable.indices.push(uniqueIndex);
            clonedTable.uniques.push(new TableUnique({
                name: uniqueIndex.name,
                columnNames: uniqueIndex.columnNames,
            }));
            upQueries.push(new Query(`ALTER TABLE ${this.escapePath(table)} ADD UNIQUE INDEX \`${uniqueIndex.name}\` (\`${column.name}\`)`));
            downQueries.push(new Query(`ALTER TABLE ${this.escapePath(table)} DROP INDEX \`${uniqueIndex.name}\``));
        }
        await this.executeQueries(upQueries, downQueries);
        clonedTable.addColumn(column);
        this.replaceCachedTable(table, clonedTable);
    }
    /**
     * Creates a new columns from the column in the table.
     */
    async addColumns(tableOrName, columns) {
        for (const column of columns) {
            await this.addColumn(tableOrName, column);
        }
    }
    /**
     * Renames column in the given table.
     */
    async renameColumn(tableOrName, oldTableColumnOrName, newTableColumnOrName) {
        const table = InstanceChecker.isTable(tableOrName)
            ? tableOrName
            : await this.getCachedTable(tableOrName);
        const oldColumn = InstanceChecker.isTableColumn(oldTableColumnOrName)
            ? oldTableColumnOrName
            : table.columns.find((c) => c.name === oldTableColumnOrName);
        if (!oldColumn)
            throw new TypeORMError(`Column "${oldTableColumnOrName}" was not found in the "${table.name}" table.`);
        let newColumn = undefined;
        if (InstanceChecker.isTableColumn(newTableColumnOrName)) {
            newColumn = newTableColumnOrName;
        }
        else {
            newColumn = oldColumn.clone();
            newColumn.name = newTableColumnOrName;
        }
        await this.changeColumn(table, oldColumn, newColumn);
    }
    /**
     * Changes a column in the table.
     */
    async changeColumn(tableOrName, oldColumnOrName, newColumn) {
        const table = InstanceChecker.isTable(tableOrName)
            ? tableOrName
            : await this.getCachedTable(tableOrName);
        let clonedTable = table.clone();
        const upQueries = [];
        const downQueries = [];
        const oldColumn = InstanceChecker.isTableColumn(oldColumnOrName)
            ? oldColumnOrName
            : table.columns.find((column) => column.name === oldColumnOrName);
        if (!oldColumn)
            throw new TypeORMError(`Column "${oldColumnOrName}" was not found in the "${table.name}" table.`);
        if ((newColumn.isGenerated !== oldColumn.isGenerated &&
            newColumn.generationStrategy !== "uuid") ||
            oldColumn.type !== newColumn.type ||
            oldColumn.length !== newColumn.length ||
            oldColumn.generatedType !== newColumn.generatedType) {
            await this.dropColumn(table, oldColumn);
            await this.addColumn(table, newColumn);
            // update cloned table
            clonedTable = table.clone();
        }
        else {
            if (newColumn.name !== oldColumn.name) {
                // We don't change any column properties, just rename it.
                upQueries.push(new Query(`ALTER TABLE ${this.escapePath(table)} CHANGE \`${oldColumn.name}\` \`${newColumn.name}\` ${this.buildCreateColumnSql(oldColumn, true, true)}`));
                downQueries.push(new Query(`ALTER TABLE ${this.escapePath(table)} CHANGE \`${newColumn.name}\` \`${oldColumn.name}\` ${this.buildCreateColumnSql(oldColumn, true, true)}`));
                // rename index constraints
                clonedTable.findColumnIndices(oldColumn).forEach((index) => {
                    // build new constraint name
                    index.columnNames.splice(index.columnNames.indexOf(oldColumn.name), 1);
                    index.columnNames.push(newColumn.name);
                    const columnNames = index.columnNames
                        .map((column) => `\`${column}\``)
                        .join(", ");
                    const newIndexName = this.connection.namingStrategy.indexName(clonedTable, index.columnNames, index.where);
                    // build queries
                    let indexType = "";
                    if (index.isUnique)
                        indexType += "UNIQUE ";
                    if (index.isSpatial)
                        indexType += "SPATIAL ";
                    if (index.isFulltext)
                        indexType += "FULLTEXT ";
                    upQueries.push(new Query(`ALTER TABLE ${this.escapePath(table)} DROP INDEX \`${index.name}\`, ADD ${indexType}INDEX \`${newIndexName}\` (${columnNames})`));
                    downQueries.push(new Query(`ALTER TABLE ${this.escapePath(table)} DROP INDEX \`${newIndexName}\`, ADD ${indexType}INDEX \`${index.name}\` (${columnNames})`));
                    // replace constraint name
                    index.name = newIndexName;
                });
                // rename foreign key constraints
                clonedTable
                    .findColumnForeignKeys(oldColumn)
                    .forEach((foreignKey) => {
                    // build new constraint name
                    foreignKey.columnNames.splice(foreignKey.columnNames.indexOf(oldColumn.name), 1);
                    foreignKey.columnNames.push(newColumn.name);
                    const columnNames = foreignKey.columnNames
                        .map((column) => `\`${column}\``)
                        .join(", ");
                    const referencedColumnNames = foreignKey.referencedColumnNames
                        .map((column) => `\`${column}\``)
                        .join(",");
                    const newForeignKeyName = this.connection.namingStrategy.foreignKeyName(clonedTable, foreignKey.columnNames);
                    // build queries
                    let up = `ALTER TABLE ${this.escapePath(table)} DROP FOREIGN KEY \`${foreignKey.name}\`, ADD CONSTRAINT \`${newForeignKeyName}\` FOREIGN KEY (${columnNames}) ` +
                        `REFERENCES ${this.escapePath(this.getTablePath(foreignKey))}(${referencedColumnNames})`;
                    if (foreignKey.onDelete)
                        up += ` ON DELETE ${foreignKey.onDelete}`;
                    if (foreignKey.onUpdate)
                        up += ` ON UPDATE ${foreignKey.onUpdate}`;
                    let down = `ALTER TABLE ${this.escapePath(table)} DROP FOREIGN KEY \`${newForeignKeyName}\`, ADD CONSTRAINT \`${foreignKey.name}\` FOREIGN KEY (${columnNames}) ` +
                        `REFERENCES ${this.escapePath(this.getTablePath(foreignKey))}(${referencedColumnNames})`;
                    if (foreignKey.onDelete)
                        down += ` ON DELETE ${foreignKey.onDelete}`;
                    if (foreignKey.onUpdate)
                        down += ` ON UPDATE ${foreignKey.onUpdate}`;
                    upQueries.push(new Query(up));
                    downQueries.push(new Query(down));
                    // replace constraint name
                    foreignKey.name = newForeignKeyName;
                });
                // rename old column in the Table object
                const oldTableColumn = clonedTable.columns.find((column) => column.name === oldColumn.name);
                clonedTable.columns[clonedTable.columns.indexOf(oldTableColumn)].name = newColumn.name;
                oldColumn.name = newColumn.name;
            }
            if (this.isColumnChanged(oldColumn, newColumn, true)) {
                upQueries.push(new Query(`ALTER TABLE ${this.escapePath(table)} CHANGE \`${oldColumn.name}\` ${this.buildCreateColumnSql(newColumn, true)}`));
                downQueries.push(new Query(`ALTER TABLE ${this.escapePath(table)} CHANGE \`${newColumn.name}\` ${this.buildCreateColumnSql(oldColumn, true)}`));
            }
            if (newColumn.isPrimary !== oldColumn.isPrimary) {
                // if table have generated column, we must drop AUTO_INCREMENT before changing primary constraints.
                const generatedColumn = clonedTable.columns.find((column) => column.isGenerated &&
                    column.generationStrategy === "increment");
                if (generatedColumn) {
                    const nonGeneratedColumn = generatedColumn.clone();
                    nonGeneratedColumn.isGenerated = false;
                    nonGeneratedColumn.generationStrategy = undefined;
                    upQueries.push(new Query(`ALTER TABLE ${this.escapePath(table)} CHANGE \`${generatedColumn.name}\` ${this.buildCreateColumnSql(nonGeneratedColumn, true)}`));
                    downQueries.push(new Query(`ALTER TABLE ${this.escapePath(table)} CHANGE \`${nonGeneratedColumn.name}\` ${this.buildCreateColumnSql(generatedColumn, true)}`));
                }
                const primaryColumns = clonedTable.primaryColumns;
                // if primary column state changed, we must always drop existed constraint.
                if (primaryColumns.length > 0) {
                    const columnNames = primaryColumns
                        .map((column) => `\`${column.name}\``)
                        .join(", ");
                    upQueries.push(new Query(`ALTER TABLE ${this.escapePath(table)} DROP PRIMARY KEY`));
                    downQueries.push(new Query(`ALTER TABLE ${this.escapePath(table)} ADD PRIMARY KEY (${columnNames})`));
                }
                if (newColumn.isPrimary === true) {
                    primaryColumns.push(newColumn);
                    // update column in table
                    const column = clonedTable.columns.find((column) => column.name === newColumn.name);
                    column.isPrimary = true;
                    const columnNames = primaryColumns
                        .map((column) => `\`${column.name}\``)
                        .join(", ");
                    upQueries.push(new Query(`ALTER TABLE ${this.escapePath(table)} ADD PRIMARY KEY (${columnNames})`));
                    downQueries.push(new Query(`ALTER TABLE ${this.escapePath(table)} DROP PRIMARY KEY`));
                }
                else {
                    const primaryColumn = primaryColumns.find((c) => c.name === newColumn.name);
                    primaryColumns.splice(primaryColumns.indexOf(primaryColumn), 1);
                    // update column in table
                    const column = clonedTable.columns.find((column) => column.name === newColumn.name);
                    column.isPrimary = false;
                    // if we have another primary keys, we must recreate constraint.
                    if (primaryColumns.length > 0) {
                        const columnNames = primaryColumns
                            .map((column) => `\`${column.name}\``)
                            .join(", ");
                        upQueries.push(new Query(`ALTER TABLE ${this.escapePath(table)} ADD PRIMARY KEY (${columnNames})`));
                        downQueries.push(new Query(`ALTER TABLE ${this.escapePath(table)} DROP PRIMARY KEY`));
                    }
                }
                // if we have generated column, and we dropped AUTO_INCREMENT property before, we must bring it back
                if (generatedColumn) {
                    const nonGeneratedColumn = generatedColumn.clone();
                    nonGeneratedColumn.isGenerated = false;
                    nonGeneratedColumn.generationStrategy = undefined;
                    upQueries.push(new Query(`ALTER TABLE ${this.escapePath(table)} CHANGE \`${nonGeneratedColumn.name}\` ${this.buildCreateColumnSql(generatedColumn, true)}`));
                    downQueries.push(new Query(`ALTER TABLE ${this.escapePath(table)} CHANGE \`${generatedColumn.name}\` ${this.buildCreateColumnSql(nonGeneratedColumn, true)}`));
                }
            }
            if (newColumn.isUnique !== oldColumn.isUnique) {
                if (newColumn.isUnique === true) {
                    const uniqueIndex = new TableIndex({
                        name: this.connection.namingStrategy.indexName(table, [
                            newColumn.name,
                        ]),
                        columnNames: [newColumn.name],
                        isUnique: true,
                    });
                    clonedTable.indices.push(uniqueIndex);
                    clonedTable.uniques.push(new TableUnique({
                        name: uniqueIndex.name,
                        columnNames: uniqueIndex.columnNames,
                    }));
                    upQueries.push(new Query(`ALTER TABLE ${this.escapePath(table)} ADD UNIQUE INDEX \`${uniqueIndex.name}\` (\`${newColumn.name}\`)`));
                    downQueries.push(new Query(`ALTER TABLE ${this.escapePath(table)} DROP INDEX \`${uniqueIndex.name}\``));
                }
                else {
                    const uniqueIndex = clonedTable.indices.find((index) => {
                        return (index.columnNames.length === 1 &&
                            index.isUnique === true &&
                            !!index.columnNames.find((columnName) => columnName === newColumn.name));
                    });
                    clonedTable.indices.splice(clonedTable.indices.indexOf(uniqueIndex), 1);
                    const tableUnique = clonedTable.uniques.find((unique) => unique.name === uniqueIndex.name);
                    clonedTable.uniques.splice(clonedTable.uniques.indexOf(tableUnique), 1);
                    upQueries.push(new Query(`ALTER TABLE ${this.escapePath(table)} DROP INDEX \`${uniqueIndex.name}\``));
                    downQueries.push(new Query(`ALTER TABLE ${this.escapePath(table)} ADD UNIQUE INDEX \`${uniqueIndex.name}\` (\`${newColumn.name}\`)`));
                }
            }
        }
        await this.executeQueries(upQueries, downQueries);
        this.replaceCachedTable(table, clonedTable);
    }
    /**
     * Changes a column in the table.
     */
    async changeColumns(tableOrName, changedColumns) {
        for (const { oldColumn, newColumn } of changedColumns) {
            await this.changeColumn(tableOrName, oldColumn, newColumn);
        }
    }
    /**
     * Drops column in the table.
     */
    async dropColumn(tableOrName, columnOrName) {
        const table = InstanceChecker.isTable(tableOrName)
            ? tableOrName
            : await this.getCachedTable(tableOrName);
        const column = InstanceChecker.isTableColumn(columnOrName)
            ? columnOrName
            : table.findColumnByName(columnOrName);
        if (!column)
            throw new TypeORMError(`Column "${columnOrName}" was not found in table "${table.name}"`);
        const clonedTable = table.clone();
        const upQueries = [];
        const downQueries = [];
        // drop primary key constraint
        if (column.isPrimary) {
            // if table have generated column, we must drop AUTO_INCREMENT before changing primary constraints.
            const generatedColumn = clonedTable.columns.find((column) => column.isGenerated &&
                column.generationStrategy === "increment");
            if (generatedColumn) {
                const nonGeneratedColumn = generatedColumn.clone();
                nonGeneratedColumn.isGenerated = false;
                nonGeneratedColumn.generationStrategy = undefined;
                upQueries.push(new Query(`ALTER TABLE ${this.escapePath(table)} CHANGE \`${generatedColumn.name}\` ${this.buildCreateColumnSql(nonGeneratedColumn, true)}`));
                downQueries.push(new Query(`ALTER TABLE ${this.escapePath(table)} CHANGE \`${nonGeneratedColumn.name}\` ${this.buildCreateColumnSql(generatedColumn, true)}`));
            }
            // dropping primary key constraint
            const columnNames = clonedTable.primaryColumns
                .map((primaryColumn) => `\`${primaryColumn.name}\``)
                .join(", ");
            upQueries.push(new Query(`ALTER TABLE ${this.escapePath(clonedTable)} DROP PRIMARY KEY`));
            downQueries.push(new Query(`ALTER TABLE ${this.escapePath(clonedTable)} ADD PRIMARY KEY (${columnNames})`));
            // update column in table
            const tableColumn = clonedTable.findColumnByName(column.name);
            tableColumn.isPrimary = false;
            // if primary key have multiple columns, we must recreate it without dropped column
            if (clonedTable.primaryColumns.length > 0) {
                const columnNames = clonedTable.primaryColumns
                    .map((primaryColumn) => `\`${primaryColumn.name}\``)
                    .join(", ");
                upQueries.push(new Query(`ALTER TABLE ${this.escapePath(clonedTable)} ADD PRIMARY KEY (${columnNames})`));
                downQueries.push(new Query(`ALTER TABLE ${this.escapePath(clonedTable)} DROP PRIMARY KEY`));
            }
            // if we have generated column, and we dropped AUTO_INCREMENT property before, and this column is not current dropping column, we must bring it back
            if (generatedColumn && generatedColumn.name !== column.name) {
                const nonGeneratedColumn = generatedColumn.clone();
                nonGeneratedColumn.isGenerated = false;
                nonGeneratedColumn.generationStrategy = undefined;
                upQueries.push(new Query(`ALTER TABLE ${this.escapePath(table)} CHANGE \`${nonGeneratedColumn.name}\` ${this.buildCreateColumnSql(generatedColumn, true)}`));
                downQueries.push(new Query(`ALTER TABLE ${this.escapePath(table)} CHANGE \`${generatedColumn.name}\` ${this.buildCreateColumnSql(nonGeneratedColumn, true)}`));
            }
        }
        // drop column index
        const columnIndex = clonedTable.indices.find((index) => index.columnNames.length === 1 &&
            index.columnNames[0] === column.name);
        if (columnIndex) {
            clonedTable.indices.splice(clonedTable.indices.indexOf(columnIndex), 1);
            upQueries.push(this.dropIndexSql(table, columnIndex));
            downQueries.push(this.createIndexSql(table, columnIndex));
        }
        else if (column.isUnique) {
            // we splice constraints both from table uniques and indices.
            const uniqueName = this.connection.namingStrategy.uniqueConstraintName(table, [
                column.name,
            ]);
            const foundUnique = clonedTable.uniques.find((unique) => unique.name === uniqueName);
            if (foundUnique)
                clonedTable.uniques.splice(clonedTable.uniques.indexOf(foundUnique), 1);
            const indexName = this.connection.namingStrategy.indexName(table, [
                column.name,
            ]);
            const foundIndex = clonedTable.indices.find((index) => index.name === indexName);
            if (foundIndex)
                clonedTable.indices.splice(clonedTable.indices.indexOf(foundIndex), 1);
            upQueries.push(new Query(`ALTER TABLE ${this.escapePath(table)} DROP INDEX \`${indexName}\``));
            downQueries.push(new Query(`ALTER TABLE ${this.escapePath(table)} ADD UNIQUE INDEX \`${indexName}\` (\`${column.name}\`)`));
        }
        upQueries.push(new Query(`ALTER TABLE ${this.escapePath(table)} DROP COLUMN \`${column.name}\``));
        downQueries.push(new Query(`ALTER TABLE ${this.escapePath(table)} ADD ${this.buildCreateColumnSql(column, true)}`));
        await this.executeQueries(upQueries, downQueries);
        clonedTable.removeColumn(column);
        this.replaceCachedTable(table, clonedTable);
    }
    /**
     * Drops the columns in the table.
     */
    async dropColumns(tableOrName, columns) {
        for (const column of [...columns]) {
            await this.dropColumn(tableOrName, column);
        }
    }
    /**
     * Creates a new primary key.
     */
    async createPrimaryKey(tableOrName, columnNames) {
        const table = InstanceChecker.isTable(tableOrName)
            ? tableOrName
            : await this.getCachedTable(tableOrName);
        const clonedTable = table.clone();
        const up = this.createPrimaryKeySql(table, columnNames);
        const down = this.dropPrimaryKeySql(table);
        await this.executeQueries(up, down);
        clonedTable.columns.forEach((column) => {
            if (columnNames.find((columnName) => columnName === column.name))
                column.isPrimary = true;
        });
        this.replaceCachedTable(table, clonedTable);
    }
    /**
     * Updates composite primary keys.
     */
    async updatePrimaryKeys(tableOrName, columns) {
        const table = InstanceChecker.isTable(tableOrName)
            ? tableOrName
            : await this.getCachedTable(tableOrName);
        const clonedTable = table.clone();
        const columnNames = columns.map((column) => column.name);
        const upQueries = [];
        const downQueries = [];
        // if table have generated column, we must drop AUTO_INCREMENT before changing primary constraints.
        const generatedColumn = clonedTable.columns.find((column) => column.isGenerated && column.generationStrategy === "increment");
        if (generatedColumn) {
            const nonGeneratedColumn = generatedColumn.clone();
            nonGeneratedColumn.isGenerated = false;
            nonGeneratedColumn.generationStrategy = undefined;
            upQueries.push(new Query(`ALTER TABLE ${this.escapePath(table)} CHANGE \`${generatedColumn.name}\` ${this.buildCreateColumnSql(nonGeneratedColumn, true)}`));
            downQueries.push(new Query(`ALTER TABLE ${this.escapePath(table)} CHANGE \`${nonGeneratedColumn.name}\` ${this.buildCreateColumnSql(generatedColumn, true)}`));
        }
        // if table already have primary columns, we must drop them.
        const primaryColumns = clonedTable.primaryColumns;
        if (primaryColumns.length > 0) {
            const columnNames = primaryColumns
                .map((column) => `\`${column.name}\``)
                .join(", ");
            upQueries.push(new Query(`ALTER TABLE ${this.escapePath(table)} DROP PRIMARY KEY`));
            downQueries.push(new Query(`ALTER TABLE ${this.escapePath(table)} ADD PRIMARY KEY (${columnNames})`));
        }
        // update columns in table.
        clonedTable.columns
            .filter((column) => columnNames.indexOf(column.name) !== -1)
            .forEach((column) => (column.isPrimary = true));
        const columnNamesString = columnNames
            .map((columnName) => `\`${columnName}\``)
            .join(", ");
        upQueries.push(new Query(`ALTER TABLE ${this.escapePath(table)} ADD PRIMARY KEY (${columnNamesString})`));
        downQueries.push(new Query(`ALTER TABLE ${this.escapePath(table)} DROP PRIMARY KEY`));
        // if we already have generated column or column is changed to generated, and we dropped AUTO_INCREMENT property before, we must bring it back
        const newOrExistGeneratedColumn = generatedColumn
            ? generatedColumn
            : columns.find((column) => column.isGenerated &&
                column.generationStrategy === "increment");
        if (newOrExistGeneratedColumn) {
            const nonGeneratedColumn = newOrExistGeneratedColumn.clone();
            nonGeneratedColumn.isGenerated = false;
            nonGeneratedColumn.generationStrategy = undefined;
            upQueries.push(new Query(`ALTER TABLE ${this.escapePath(table)} CHANGE \`${nonGeneratedColumn.name}\` ${this.buildCreateColumnSql(newOrExistGeneratedColumn, true)}`));
            downQueries.push(new Query(`ALTER TABLE ${this.escapePath(table)} CHANGE \`${newOrExistGeneratedColumn.name}\` ${this.buildCreateColumnSql(nonGeneratedColumn, true)}`));
            // if column changed to generated, we must update it in table
            const changedGeneratedColumn = clonedTable.columns.find((column) => column.name === newOrExistGeneratedColumn.name);
            changedGeneratedColumn.isGenerated = true;
            changedGeneratedColumn.generationStrategy = "increment";
        }
        await this.executeQueries(upQueries, downQueries);
        this.replaceCachedTable(table, clonedTable);
    }
    /**
     * Drops a primary key.
     */
    async dropPrimaryKey(tableOrName) {
        const table = InstanceChecker.isTable(tableOrName)
            ? tableOrName
            : await this.getCachedTable(tableOrName);
        const up = this.dropPrimaryKeySql(table);
        const down = this.createPrimaryKeySql(table, table.primaryColumns.map((column) => column.name));
        await this.executeQueries(up, down);
        table.primaryColumns.forEach((column) => {
            column.isPrimary = false;
        });
    }
    /**
     * Creates a new unique constraint.
     */
    async createUniqueConstraint(tableOrName, uniqueConstraint) {
        throw new TypeORMError(`MySql does not support unique constraints. Use unique index instead.`);
    }
    /**
     * Creates a new unique constraints.
     */
    async createUniqueConstraints(tableOrName, uniqueConstraints) {
        throw new TypeORMError(`MySql does not support unique constraints. Use unique index instead.`);
    }
    /**
     * Drops a unique constraint.
     */
    async dropUniqueConstraint(tableOrName, uniqueOrName) {
        throw new TypeORMError(`MySql does not support unique constraints. Use unique index instead.`);
    }
    /**
     * Drops a unique constraints.
     */
    async dropUniqueConstraints(tableOrName, uniqueConstraints) {
        throw new TypeORMError(`MySql does not support unique constraints. Use unique index instead.`);
    }
    /**
     * Creates a new check constraint.
     */
    async createCheckConstraint(tableOrName, checkConstraint) {
        throw new TypeORMError(`MySql does not support check constraints.`);
    }
    /**
     * Creates a new check constraints.
     */
    async createCheckConstraints(tableOrName, checkConstraints) {
        throw new TypeORMError(`MySql does not support check constraints.`);
    }
    /**
     * Drops check constraint.
     */
    async dropCheckConstraint(tableOrName, checkOrName) {
        throw new TypeORMError(`MySql does not support check constraints.`);
    }
    /**
     * Drops check constraints.
     */
    async dropCheckConstraints(tableOrName, checkConstraints) {
        throw new TypeORMError(`MySql does not support check constraints.`);
    }
    /**
     * Creates a new exclusion constraint.
     */
    async createExclusionConstraint(tableOrName, exclusionConstraint) {
        throw new TypeORMError(`MySql does not support exclusion constraints.`);
    }
    /**
     * Creates a new exclusion constraints.
     */
    async createExclusionConstraints(tableOrName, exclusionConstraints) {
        throw new TypeORMError(`MySql does not support exclusion constraints.`);
    }
    /**
     * Drops exclusion constraint.
     */
    async dropExclusionConstraint(tableOrName, exclusionOrName) {
        throw new TypeORMError(`MySql does not support exclusion constraints.`);
    }
    /**
     * Drops exclusion constraints.
     */
    async dropExclusionConstraints(tableOrName, exclusionConstraints) {
        throw new TypeORMError(`MySql does not support exclusion constraints.`);
    }
    /**
     * Creates a new foreign key.
     */
    async createForeignKey(tableOrName, foreignKey) {
        const table = InstanceChecker.isTable(tableOrName)
            ? tableOrName
            : await this.getCachedTable(tableOrName);
        // new FK may be passed without name. In this case we generate FK name manually.
        if (!foreignKey.name)
            foreignKey.name = this.connection.namingStrategy.foreignKeyName(table, foreignKey.columnNames);
        const up = this.createForeignKeySql(table, foreignKey);
        const down = this.dropForeignKeySql(table, foreignKey);
        await this.executeQueries(up, down);
        table.addForeignKey(foreignKey);
    }
    /**
     * Creates a new foreign keys.
     */
    async createForeignKeys(tableOrName, foreignKeys) {
        const promises = foreignKeys.map((foreignKey) => this.createForeignKey(tableOrName, foreignKey));
        await Promise.all(promises);
    }
    /**
     * Drops a foreign key.
     */
    async dropForeignKey(tableOrName, foreignKeyOrName) {
        const table = InstanceChecker.isTable(tableOrName)
            ? tableOrName
            : await this.getCachedTable(tableOrName);
        const foreignKey = InstanceChecker.isTableForeignKey(foreignKeyOrName)
            ? foreignKeyOrName
            : table.foreignKeys.find((fk) => fk.name === foreignKeyOrName);
        if (!foreignKey)
            throw new TypeORMError(`Supplied foreign key was not found in table ${table.name}`);
        const up = this.dropForeignKeySql(table, foreignKey);
        const down = this.createForeignKeySql(table, foreignKey);
        await this.executeQueries(up, down);
        table.removeForeignKey(foreignKey);
    }
    /**
     * Drops a foreign keys from the table.
     */
    async dropForeignKeys(tableOrName, foreignKeys) {
        const promises = foreignKeys.map((foreignKey) => this.dropForeignKey(tableOrName, foreignKey));
        await Promise.all(promises);
    }
    /**
     * Creates a new index.
     */
    async createIndex(tableOrName, index) {
        const table = InstanceChecker.isTable(tableOrName)
            ? tableOrName
            : await this.getCachedTable(tableOrName);
        // new index may be passed without name. In this case we generate index name manually.
        if (!index.name)
            index.name = this.generateIndexName(table, index);
        const up = this.createIndexSql(table, index);
        const down = this.dropIndexSql(table, index);
        await this.executeQueries(up, down);
        table.addIndex(index, true);
    }
    /**
     * Creates a new indices
     */
    async createIndices(tableOrName, indices) {
        const promises = indices.map((index) => this.createIndex(tableOrName, index));
        await Promise.all(promises);
    }
    /**
     * Drops an index.
     */
    async dropIndex(tableOrName, indexOrName) {
        const table = InstanceChecker.isTable(tableOrName)
            ? tableOrName
            : await this.getCachedTable(tableOrName);
        const index = InstanceChecker.isTableIndex(indexOrName)
            ? indexOrName
            : table.indices.find((i) => i.name === indexOrName);
        if (!index)
            throw new TypeORMError(`Supplied index ${indexOrName} was not found in table ${table.name}`);
        // old index may be passed without name. In this case we generate index name manually.
        if (!index.name)
            index.name = this.generateIndexName(table, index);
        const up = this.dropIndexSql(table, index);
        const down = this.createIndexSql(table, index);
        await this.executeQueries(up, down);
        table.removeIndex(index, true);
    }
    /**
     * Drops an indices from the table.
     */
    async dropIndices(tableOrName, indices) {
        const promises = indices.map((index) => this.dropIndex(tableOrName, index));
        await Promise.all(promises);
    }
    /**
     * Clears all table contents.
     * Note: this operation uses SQL's TRUNCATE query which cannot be reverted in transactions.
     */
    async clearTable(tableOrName) {
        await this.query(`TRUNCATE TABLE ${this.escapePath(tableOrName)}`);
    }
    /**
     * Removes all tables from the currently connected database.
     * Be careful using this method and avoid using it in production or migrations
     * (because it can clear all your database).
     */
    async clearDatabase(database) {
        const dbName = database ? database : this.driver.database;
        if (dbName) {
            const isDatabaseExist = await this.hasDatabase(dbName);
            if (!isDatabaseExist)
                return Promise.resolve();
        }
        else {
            throw new TypeORMError(`Can not clear database. No database is specified`);
        }
        const isAnotherTransactionActive = this.isTransactionActive;
        if (!isAnotherTransactionActive)
            await this.startTransaction();
        try {
            const selectViewDropsQuery = `SELECT concat('DROP VIEW IF EXISTS \`', table_schema, '\`.\`', table_name, '\`') AS \`query\` FROM \`INFORMATION_SCHEMA\`.\`VIEWS\` WHERE \`TABLE_SCHEMA\` = '${dbName}'`;
            const dropViewQueries = await this.query(selectViewDropsQuery);
            await Promise.all(dropViewQueries.map((q) => this.query(q["query"])));
            const disableForeignKeysCheckQuery = `SET FOREIGN_KEY_CHECKS = 0;`;
            const dropTablesQuery = `SELECT concat('DROP TABLE IF EXISTS \`', table_schema, '\`.\`', table_name, '\`') AS \`query\` FROM \`INFORMATION_SCHEMA\`.\`TABLES\` WHERE \`TABLE_SCHEMA\` = '${dbName}'`;
            const enableForeignKeysCheckQuery = `SET FOREIGN_KEY_CHECKS = 1;`;
            await this.query(disableForeignKeysCheckQuery);
            const dropQueries = await this.query(dropTablesQuery);
            await Promise.all(dropQueries.map((query) => this.query(query["query"])));
            await this.query(enableForeignKeysCheckQuery);
            if (!isAnotherTransactionActive) {
                await this.commitTransaction();
            }
        }
        catch (error) {
            try {
                // we throw original error even if rollback thrown an error
                if (!isAnotherTransactionActive) {
                    await this.rollbackTransaction();
                }
            }
            catch (rollbackError) { }
            throw error;
        }
    }
    // -------------------------------------------------------------------------
    // Protected Methods
    // -------------------------------------------------------------------------
    async loadViews(viewNames) {
        const hasTable = await this.hasTable(this.getTypeormMetadataTableName());
        if (!hasTable) {
            return [];
        }
        if (!viewNames) {
            viewNames = [];
        }
        const currentDatabase = await this.getCurrentDatabase();
        const viewsCondition = viewNames
            .map((tableName) => {
            let { database, tableName: name } = this.driver.parseTableName(tableName);
            if (!database) {
                database = currentDatabase;
            }
            return `(\`t\`.\`schema\` = '${database}' AND \`t\`.\`name\` = '${name}')`;
        })
            .join(" OR ");
        const query = `SELECT \`t\`.*, \`v\`.\`check_option\` FROM ${this.escapePath(this.getTypeormMetadataTableName())} \`t\` ` +
            `INNER JOIN \`information_schema\`.\`views\` \`v\` ON \`v\`.\`table_schema\` = \`t\`.\`schema\` AND \`v\`.\`table_name\` = \`t\`.\`name\` WHERE \`t\`.\`type\` = '${MetadataTableType.VIEW}' ${viewsCondition ? `AND (${viewsCondition})` : ""}`;
        const dbViews = await this.query(query);
        return dbViews.map((dbView) => {
            const view = new View();
            const db = dbView["schema"] === currentDatabase
                ? undefined
                : dbView["schema"];
            view.database = dbView["schema"];
            view.name = this.driver.buildTableName(dbView["name"], undefined, db);
            view.expression = dbView["value"];
            return view;
        });
    }
    /**
     * Loads all tables (with given names) from the database and creates a Table from them.
     */
    async loadTables(tableNames) {
        // if no tables given then no need to proceed
        if (tableNames && tableNames.length === 0) {
            return [];
        }
        const dbTables = [];
        const currentDatabase = await this.getCurrentDatabase();
        if (!tableNames) {
            const tablesSql = `SELECT TABLE_NAME, TABLE_SCHEMA FROM \`INFORMATION_SCHEMA\`.\`TABLES\``;
            dbTables.push(...(await this.query(tablesSql)));
        }
        else {
            const tablesCondition = tableNames
                .map((tableName) => {
                let [database, name] = tableName.split(".");
                if (!name) {
                    name = database;
                    database = this.driver.database || currentDatabase;
                }
                return `(\`TABLE_SCHEMA\` = '${database}' AND \`TABLE_NAME\` = '${name}')`;
            })
                .join(" OR ");
            const tablesSql = `SELECT TABLE_NAME, TABLE_SCHEMA FROM \`INFORMATION_SCHEMA\`.\`TABLES\` WHERE ` +
                tablesCondition;
            dbTables.push(...(await this.query(tablesSql)));
        }
        if (dbTables.length === 0) {
            return [];
        }
        const columnsCondition = dbTables
            .map(({ TABLE_NAME, TABLE_SCHEMA }) => {
            return `(\`TABLE_SCHEMA\` = '${TABLE_SCHEMA}' AND \`TABLE_NAME\` = '${TABLE_NAME}')`;
        })
            .join(" OR ");
        const columnsSql = `SELECT * FROM \`INFORMATION_SCHEMA\`.\`COLUMNS\` WHERE ` +
            columnsCondition;
        const primaryKeySql = `SELECT * FROM \`INFORMATION_SCHEMA\`.\`KEY_COLUMN_USAGE\` WHERE \`CONSTRAINT_NAME\` = 'PRIMARY' AND (${columnsCondition})`;
        const collationsSql = `SELECT \`SCHEMA_NAME\`, \`DEFAULT_CHARACTER_SET_NAME\` as \`CHARSET\`, \`DEFAULT_COLLATION_NAME\` AS \`COLLATION\` FROM \`INFORMATION_SCHEMA\`.\`SCHEMATA\``;
        const indicesCondition = dbTables
            .map(({ TABLE_NAME, TABLE_SCHEMA }) => {
            return `(\`s\`.\`TABLE_SCHEMA\` = '${TABLE_SCHEMA}' AND \`s\`.\`TABLE_NAME\` = '${TABLE_NAME}')`;
        })
            .join(" OR ");
        const indicesSql = `SELECT \`s\`.* FROM \`INFORMATION_SCHEMA\`.\`STATISTICS\` \`s\` ` +
            `LEFT JOIN \`INFORMATION_SCHEMA\`.\`REFERENTIAL_CONSTRAINTS\` \`rc\` ON \`s\`.\`INDEX_NAME\` = \`rc\`.\`CONSTRAINT_NAME\` ` +
            `WHERE (${indicesCondition}) AND \`s\`.\`INDEX_NAME\` != 'PRIMARY' AND \`rc\`.\`CONSTRAINT_NAME\` IS NULL`;
        const foreignKeysCondition = dbTables
            .map(({ TABLE_NAME, TABLE_SCHEMA }) => {
            return `(\`kcu\`.\`TABLE_SCHEMA\` = '${TABLE_SCHEMA}' AND \`kcu\`.\`TABLE_NAME\` = '${TABLE_NAME}')`;
        })
            .join(" OR ");
        const foreignKeysSql = `SELECT \`kcu\`.\`TABLE_SCHEMA\`, \`kcu\`.\`TABLE_NAME\`, \`kcu\`.\`CONSTRAINT_NAME\`, \`kcu\`.\`COLUMN_NAME\`, \`kcu\`.\`REFERENCED_TABLE_SCHEMA\`, ` +
            `\`kcu\`.\`REFERENCED_TABLE_NAME\`, \`kcu\`.\`REFERENCED_COLUMN_NAME\`, \`rc\`.\`DELETE_RULE\` \`ON_DELETE\`, \`rc\`.\`UPDATE_RULE\` \`ON_UPDATE\` ` +
            `FROM \`INFORMATION_SCHEMA\`.\`KEY_COLUMN_USAGE\` \`kcu\` ` +
            `INNER JOIN \`INFORMATION_SCHEMA\`.\`REFERENTIAL_CONSTRAINTS\` \`rc\` ON \`rc\`.\`constraint_name\` = \`kcu\`.\`constraint_name\` ` +
            `WHERE ` +
            foreignKeysCondition;
        const [dbColumns, dbPrimaryKeys, dbCollations, dbIndices, dbForeignKeys,] = await Promise.all([
            this.query(columnsSql),
            this.query(primaryKeySql),
            this.query(collationsSql),
            this.query(indicesSql),
            this.query(foreignKeysSql),
        ]);
        // create tables for loaded tables
        return dbTables.map((dbTable) => {
            const table = new Table();
            const dbCollation = dbCollations.find((coll) => coll["SCHEMA_NAME"] === dbTable["TABLE_SCHEMA"]);
            const defaultCollation = dbCollation["COLLATION"];
            const defaultCharset = dbCollation["CHARSET"];
            // We do not need to join database name, when database is by default.
            const db = dbTable["TABLE_SCHEMA"] === currentDatabase
                ? undefined
                : dbTable["TABLE_SCHEMA"];
            table.database = dbTable["TABLE_SCHEMA"];
            table.name = this.driver.buildTableName(dbTable["TABLE_NAME"], undefined, db);
            // create columns from the loaded columns
            table.columns = dbColumns
                .filter((dbColumn) => dbColumn["TABLE_NAME"] === dbTable["TABLE_NAME"] &&
                dbColumn["TABLE_SCHEMA"] === dbTable["TABLE_SCHEMA"])
                .map((dbColumn) => {
                const columnUniqueIndices = dbIndices.filter((dbIndex) => {
                    return (dbIndex["TABLE_NAME"] === dbTable["TABLE_NAME"] &&
                        dbIndex["TABLE_SCHEMA"] ===
                            dbTable["TABLE_SCHEMA"] &&
                        dbIndex["COLUMN_NAME"] ===
                            dbColumn["COLUMN_NAME"] &&
                        parseInt(dbIndex["NON_UNIQUE"], 10) === 0);
                });
                const tableMetadata = this.connection.entityMetadatas.find((metadata) => this.getTablePath(table) ===
                    this.getTablePath(metadata));
                const hasIgnoredIndex = columnUniqueIndices.length > 0 &&
                    tableMetadata &&
                    tableMetadata.indices.some((index) => {
                        return columnUniqueIndices.some((uniqueIndex) => {
                            return (index.name === uniqueIndex["INDEX_NAME"] &&
                                index.synchronize === false);
                        });
                    });
                const isConstraintComposite = columnUniqueIndices.every((uniqueIndex) => {
                    return dbIndices.some((dbIndex) => dbIndex["INDEX_NAME"] ===
                        uniqueIndex["INDEX_NAME"] &&
                        dbIndex["COLUMN_NAME"] !==
                            dbColumn["COLUMN_NAME"]);
                });
                const tableColumn = new TableColumn();
                tableColumn.name = dbColumn["COLUMN_NAME"];
                tableColumn.type = dbColumn["DATA_TYPE"].toLowerCase();
                // Unsigned columns are handled differently when it comes to width.
                // Hence, we need to set the unsigned attribute before we check the width.
                tableColumn.zerofill =
                    dbColumn["COLUMN_TYPE"].includes("zerofill");
                tableColumn.unsigned =
                    tableColumn.zerofill ||
                        dbColumn["COLUMN_TYPE"].includes("unsigned");
                if (this.driver.unsignedColumnTypes.includes(tableColumn.type)) {
                    const width = dbColumn["COLUMN_TYPE"].substring(dbColumn["COLUMN_TYPE"].indexOf("(") + 1, dbColumn["COLUMN_TYPE"].indexOf(")"));
                    tableColumn.width =
                        width &&
                            !this.isDefaultColumnWidth(table, tableColumn, parseInt(width))
                            ? parseInt(width)
                            : undefined;
                }
                if (dbColumn["COLUMN_DEFAULT"] === null ||
                    dbColumn["COLUMN_DEFAULT"] === undefined) {
                    tableColumn.default = undefined;
                }
                else {
                    tableColumn.default =
                        dbColumn["COLUMN_DEFAULT"] === "CURRENT_TIMESTAMP"
                            ? dbColumn["COLUMN_DEFAULT"]
                            : `'${dbColumn["COLUMN_DEFAULT"]}'`;
                }
                if (dbColumn["EXTRA"].indexOf("on update") !== -1) {
                    tableColumn.onUpdate = dbColumn["EXTRA"].substring(dbColumn["EXTRA"].indexOf("on update") + 10);
                }
                if (dbColumn["GENERATION_EXPRESSION"]) {
                    tableColumn.asExpression =
                        dbColumn["GENERATION_EXPRESSION"];
                    tableColumn.generatedType =
                        dbColumn["EXTRA"].indexOf("VIRTUAL") !== -1
                            ? "VIRTUAL"
                            : "STORED";
                }
                tableColumn.isUnique =
                    columnUniqueIndices.length > 0 &&
                        !hasIgnoredIndex &&
                        !isConstraintComposite;
                tableColumn.isNullable = dbColumn["IS_NULLABLE"] === "YES";
                tableColumn.isPrimary = dbPrimaryKeys.some((dbPrimaryKey) => {
                    return (dbPrimaryKey["TABLE_NAME"] ===
                        dbColumn["TABLE_NAME"] &&
                        dbPrimaryKey["TABLE_SCHEMA"] ===
                            dbColumn["TABLE_SCHEMA"] &&
                        dbPrimaryKey["COLUMN_NAME"] ===
                            dbColumn["COLUMN_NAME"]);
                });
                tableColumn.zerofill =
                    dbColumn["COLUMN_TYPE"].indexOf("zerofill") !== -1;
                tableColumn.isGenerated =
                    dbColumn["EXTRA"].indexOf("auto_increment") !== -1;
                if (tableColumn.isGenerated)
                    tableColumn.generationStrategy = "increment";
                tableColumn.comment =
                    typeof dbColumn["COLUMN_COMMENT"] === "string" &&
                        dbColumn["COLUMN_COMMENT"].length === 0
                        ? undefined
                        : dbColumn["COLUMN_COMMENT"];
                if (dbColumn["CHARACTER_SET_NAME"])
                    tableColumn.charset =
                        dbColumn["CHARACTER_SET_NAME"] === defaultCharset
                            ? undefined
                            : dbColumn["CHARACTER_SET_NAME"];
                if (dbColumn["COLLATION_NAME"])
                    tableColumn.collation =
                        dbColumn["COLLATION_NAME"] === defaultCollation
                            ? undefined
                            : dbColumn["COLLATION_NAME"];
                // check only columns that have length property
                if (this.driver.withLengthColumnTypes.indexOf(tableColumn.type) !== -1 &&
                    dbColumn["CHARACTER_MAXIMUM_LENGTH"]) {
                    const length = dbColumn["CHARACTER_MAXIMUM_LENGTH"].toString();
                    tableColumn.length = !this.isDefaultColumnLength(table, tableColumn, length)
                        ? length
                        : "";
                }
                if (tableColumn.type === "decimal" ||
                    tableColumn.type === "double" ||
                    tableColumn.type === "float") {
                    if (dbColumn["NUMERIC_PRECISION"] !== null &&
                        !this.isDefaultColumnPrecision(table, tableColumn, dbColumn["NUMERIC_PRECISION"]))
                        tableColumn.precision = parseInt(dbColumn["NUMERIC_PRECISION"]);
                    if (dbColumn["NUMERIC_SCALE"] !== null &&
                        !this.isDefaultColumnScale(table, tableColumn, dbColumn["NUMERIC_SCALE"]))
                        tableColumn.scale = parseInt(dbColumn["NUMERIC_SCALE"]);
                }
                if (tableColumn.type === "enum" ||
                    tableColumn.type === "simple-enum" ||
                    tableColumn.type === "set") {
                    const colType = dbColumn["COLUMN_TYPE"];
                    const items = colType
                        .substring(colType.indexOf("(") + 1, colType.lastIndexOf(")"))
                        .split(",");
                    tableColumn.enum = items.map((item) => {
                        return item.substring(1, item.length - 1);
                    });
                    tableColumn.length = "";
                }
                if ((tableColumn.type === "datetime" ||
                    tableColumn.type === "time" ||
                    tableColumn.type === "timestamp") &&
                    dbColumn["DATETIME_PRECISION"] !== null &&
                    dbColumn["DATETIME_PRECISION"] !== undefined &&
                    !this.isDefaultColumnPrecision(table, tableColumn, parseInt(dbColumn["DATETIME_PRECISION"]))) {
                    tableColumn.precision = parseInt(dbColumn["DATETIME_PRECISION"]);
                }
                return tableColumn;
            });
            // find foreign key constraints of table, group them by constraint name and build TableForeignKey.
            const tableForeignKeyConstraints = OrmUtils.uniq(dbForeignKeys.filter((dbForeignKey) => {
                return (dbForeignKey["TABLE_NAME"] === dbTable["TABLE_NAME"] &&
                    dbForeignKey["TABLE_SCHEMA"] === dbTable["TABLE_SCHEMA"]);
            }), (dbForeignKey) => dbForeignKey["CONSTRAINT_NAME"]);
            table.foreignKeys = tableForeignKeyConstraints.map((dbForeignKey) => {
                const foreignKeys = dbForeignKeys.filter((dbFk) => dbFk["CONSTRAINT_NAME"] ===
                    dbForeignKey["CONSTRAINT_NAME"]);
                // if referenced table located in currently used db, we don't need to concat db name to table name.
                const database = dbForeignKey["REFERENCED_TABLE_SCHEMA"] ===
                    currentDatabase
                    ? undefined
                    : dbForeignKey["REFERENCED_TABLE_SCHEMA"];
                const referencedTableName = this.driver.buildTableName(dbForeignKey["REFERENCED_TABLE_NAME"], undefined, database);
                return new TableForeignKey({
                    name: dbForeignKey["CONSTRAINT_NAME"],
                    columnNames: foreignKeys.map((dbFk) => dbFk["COLUMN_NAME"]),
                    referencedDatabase: dbForeignKey["REFERENCED_TABLE_SCHEMA"],
                    referencedTableName: referencedTableName,
                    referencedColumnNames: foreignKeys.map((dbFk) => dbFk["REFERENCED_COLUMN_NAME"]),
                    onDelete: dbForeignKey["ON_DELETE"],
                    onUpdate: dbForeignKey["ON_UPDATE"],
                });
            });
            // find index constraints of table, group them by constraint name and build TableIndex.
            const tableIndexConstraints = OrmUtils.uniq(dbIndices.filter((dbIndex) => {
                return (dbIndex["TABLE_NAME"] === dbTable["TABLE_NAME"] &&
                    dbIndex["TABLE_SCHEMA"] === dbTable["TABLE_SCHEMA"]);
            }), (dbIndex) => dbIndex["INDEX_NAME"]);
            table.indices = tableIndexConstraints.map((constraint) => {
                const indices = dbIndices.filter((index) => {
                    return (index["TABLE_SCHEMA"] === constraint["TABLE_SCHEMA"] &&
                        index["TABLE_NAME"] === constraint["TABLE_NAME"] &&
                        index["INDEX_NAME"] === constraint["INDEX_NAME"]);
                });
                const nonUnique = parseInt(constraint["NON_UNIQUE"], 10);
                return new TableIndex({
                    table: table,
                    name: constraint["INDEX_NAME"],
                    columnNames: indices.map((i) => i["COLUMN_NAME"]),
                    isUnique: nonUnique === 0,
                    isSpatial: constraint["INDEX_TYPE"] === "SPATIAL",
                    isFulltext: constraint["INDEX_TYPE"] === "FULLTEXT",
                });
            });
            return table;
        });
    }
    /**
     * Builds create table sql
     */
    createTableSql(table, createForeignKeys) {
        const columnDefinitions = table.columns
            .map((column) => this.buildCreateColumnSql(column, true))
            .join(", ");
        let sql = `CREATE TABLE ${this.escapePath(table)} (${columnDefinitions}`;
        // we create unique indexes instead of unique constraints, because MySql does not have unique constraints.
        // if we mark column as Unique, it means that we create UNIQUE INDEX.
        table.columns
            .filter((column) => column.isUnique)
            .forEach((column) => {
            const isUniqueIndexExist = table.indices.some((index) => {
                return (index.columnNames.length === 1 &&
                    !!index.isUnique &&
                    index.columnNames.indexOf(column.name) !== -1);
            });
            const isUniqueConstraintExist = table.uniques.some((unique) => {
                return (unique.columnNames.length === 1 &&
                    unique.columnNames.indexOf(column.name) !== -1);
            });
            if (!isUniqueIndexExist && !isUniqueConstraintExist)
                table.indices.push(new TableIndex({
                    name: this.connection.namingStrategy.uniqueConstraintName(table, [column.name]),
                    columnNames: [column.name],
                    isUnique: true,
                }));
        });
        // as MySql does not have unique constraints, we must create table indices from table uniques and mark them as unique.
        if (table.uniques.length > 0) {
            table.uniques.forEach((unique) => {
                const uniqueExist = table.indices.some((index) => index.name === unique.name);
                if (!uniqueExist) {
                    table.indices.push(new TableIndex({
                        name: unique.name,
                        columnNames: unique.columnNames,
                        isUnique: true,
                    }));
                }
            });
        }
        if (table.indices.length > 0) {
            const indicesSql = table.indices
                .map((index) => {
                const columnNames = index.columnNames
                    .map((columnName) => `\`${columnName}\``)
                    .join(", ");
                if (!index.name)
                    index.name = this.connection.namingStrategy.indexName(table, index.columnNames, index.where);
                let indexType = "";
                if (index.isUnique)
                    indexType += "UNIQUE ";
                if (index.isSpatial)
                    indexType += "SPATIAL ";
                if (index.isFulltext)
                    indexType += "FULLTEXT ";
                return `${indexType}INDEX \`${index.name}\` (${columnNames})`;
            })
                .join(", ");
            sql += `, ${indicesSql}`;
        }
        if (table.foreignKeys.length > 0 && createForeignKeys) {
            const foreignKeysSql = table.foreignKeys
                .map((fk) => {
                const columnNames = fk.columnNames
                    .map((columnName) => `\`${columnName}\``)
                    .join(", ");
                if (!fk.name)
                    fk.name = this.connection.namingStrategy.foreignKeyName(table, fk.columnNames);
                const referencedColumnNames = fk.referencedColumnNames
                    .map((columnName) => `\`${columnName}\``)
                    .join(", ");
                let constraint = `CONSTRAINT \`${fk.name}\` FOREIGN KEY (${columnNames}) REFERENCES ${this.escapePath(this.getTablePath(fk))} (${referencedColumnNames})`;
                if (fk.onDelete)
                    constraint += ` ON DELETE ${fk.onDelete}`;
                if (fk.onUpdate)
                    constraint += ` ON UPDATE ${fk.onUpdate}`;
                return constraint;
            })
                .join(", ");
            sql += `, ${foreignKeysSql}`;
        }
        if (table.primaryColumns.length > 0) {
            const columnNames = table.primaryColumns
                .map((column) => `\`${column.name}\``)
                .join(", ");
            sql += `, PRIMARY KEY (${columnNames})`;
        }
        sql += `) ENGINE=${table.engine || "InnoDB"}`;
        return new Query(sql);
    }
    /**
     * Builds drop table sql
     */
    dropTableSql(tableOrName) {
        return new Query(`DROP TABLE ${this.escapePath(tableOrName)}`);
    }
    createViewSql(view) {
        if (typeof view.expression === "string") {
            return new Query(`CREATE VIEW ${this.escapePath(view)} AS ${view.expression}`);
        }
        else {
            return new Query(`CREATE VIEW ${this.escapePath(view)} AS ${view
                .expression(this.connection)
                .getQuery()}`);
        }
    }
    async insertViewDefinitionSql(view) {
        const currentDatabase = await this.getCurrentDatabase();
        const expression = typeof view.expression === "string"
            ? view.expression.trim()
            : view.expression(this.connection).getQuery();
        return this.insertTypeormMetadataSql({
            type: MetadataTableType.VIEW,
            schema: currentDatabase,
            name: view.name,
            value: expression,
        });
    }
    /**
     * Builds drop view sql.
     */
    dropViewSql(viewOrPath) {
        return new Query(`DROP VIEW ${this.escapePath(viewOrPath)}`);
    }
    /**
     * Builds remove view sql.
     */
    async deleteViewDefinitionSql(viewOrPath) {
        const currentDatabase = await this.getCurrentDatabase();
        const viewName = InstanceChecker.isView(viewOrPath)
            ? viewOrPath.name
            : viewOrPath;
        return this.deleteTypeormMetadataSql({
            type: MetadataTableType.VIEW,
            schema: currentDatabase,
            name: viewName,
        });
    }
    /**
     * Builds create index sql.
     */
    createIndexSql(table, index) {
        const columns = index.columnNames
            .map((columnName) => `\`${columnName}\``)
            .join(", ");
        let indexType = "";
        if (index.isUnique)
            indexType += "UNIQUE ";
        if (index.isSpatial)
            indexType += "SPATIAL ";
        if (index.isFulltext)
            indexType += "FULLTEXT ";
        return new Query(`CREATE ${indexType}INDEX \`${index.name}\` ON ${this.escapePath(table)} (${columns})`);
    }
    /**
     * Builds drop index sql.
     */
    dropIndexSql(table, indexOrName) {
        const indexName = InstanceChecker.isTableIndex(indexOrName)
            ? indexOrName.name
            : indexOrName;
        return new Query(`DROP INDEX \`${indexName}\` ON ${this.escapePath(table)}`);
    }
    /**
     * Builds create primary key sql.
     */
    createPrimaryKeySql(table, columnNames) {
        const columnNamesString = columnNames
            .map((columnName) => `\`${columnName}\``)
            .join(", ");
        return new Query(`ALTER TABLE ${this.escapePath(table)} ADD PRIMARY KEY (${columnNamesString})`);
    }
    /**
     * Builds drop primary key sql.
     */
    dropPrimaryKeySql(table) {
        return new Query(`ALTER TABLE ${this.escapePath(table)} DROP PRIMARY KEY`);
    }
    /**
     * Builds create foreign key sql.
     */
    createForeignKeySql(table, foreignKey) {
        const columnNames = foreignKey.columnNames
            .map((column) => `\`${column}\``)
            .join(", ");
        const referencedColumnNames = foreignKey.referencedColumnNames
            .map((column) => `\`${column}\``)
            .join(",");
        let sql = `ALTER TABLE ${this.escapePath(table)} ADD CONSTRAINT \`${foreignKey.name}\` FOREIGN KEY (${columnNames}) ` +
            `REFERENCES ${this.escapePath(this.getTablePath(foreignKey))}(${referencedColumnNames})`;
        if (foreignKey.onDelete)
            sql += ` ON DELETE ${foreignKey.onDelete}`;
        if (foreignKey.onUpdate)
            sql += ` ON UPDATE ${foreignKey.onUpdate}`;
        return new Query(sql);
    }
    /**
     * Builds drop foreign key sql.
     */
    dropForeignKeySql(table, foreignKeyOrName) {
        const foreignKeyName = InstanceChecker.isTableForeignKey(foreignKeyOrName)
            ? foreignKeyOrName.name
            : foreignKeyOrName;
        return new Query(`ALTER TABLE ${this.escapePath(table)} DROP FOREIGN KEY \`${foreignKeyName}\``);
    }
    /**
     * Escapes a given comment so it's safe to include in a query.
     */
    escapeComment(comment) {
        if (!comment || comment.length === 0) {
            return `''`;
        }
        comment = comment
            .replace(/\\/g, "\\\\") // MySQL allows escaping characters via backslashes
            .replace(/'/g, "''")
            .replace(/\u0000/g, ""); // Null bytes aren't allowed in comments
        return `'${comment}'`;
    }
    /**
     * Escapes given table or view path.
     */
    escapePath(target) {
        const { database, tableName } = this.driver.parseTableName(target);
        if (database && database !== this.driver.database) {
            return `\`${database}\`.\`${tableName}\``;
        }
        return `\`${tableName}\``;
    }
    /**
     * Builds a part of query to create/change a column.
     */
    buildCreateColumnSql(column, skipPrimary, skipName = false) {
        let c = "";
        if (skipName) {
            c = this.connection.driver.createFullType(column);
        }
        else {
            c = `\`${column.name}\` ${this.connection.driver.createFullType(column)}`;
        }
        if (column.asExpression)
            c += ` AS (${column.asExpression}) ${column.generatedType ? column.generatedType : "VIRTUAL"}`;
        // if you specify ZEROFILL for a numeric column, MySQL automatically adds the UNSIGNED attribute to that column.
        if (column.zerofill) {
            c += " ZEROFILL";
        }
        else if (column.unsigned) {
            c += " UNSIGNED";
        }
        if (column.enum)
            c += ` (${column.enum
                .map((value) => "'" + value + "'")
                .join(", ")})`;
        if (column.charset)
            c += ` CHARACTER SET "${column.charset}"`;
        if (column.collation)
            c += ` COLLATE "${column.collation}"`;
        if (!column.isNullable)
            c += " NOT NULL";
        if (column.isNullable)
            c += " NULL";
        if (column.isPrimary && !skipPrimary)
            c += " PRIMARY KEY";
        if (column.isGenerated && column.generationStrategy === "increment")
            // don't use skipPrimary here since updates can update already exist primary without auto inc.
            c += " AUTO_INCREMENT";
        if (column.comment)
            c += ` COMMENT ${this.escapeComment(column.comment)}`;
        if (column.default !== undefined && column.default !== null)
            c += ` DEFAULT ${column.default}`;
        if (column.onUpdate)
            c += ` ON UPDATE ${column.onUpdate}`;
        return c;
    }
    /**
     * Checks if column display width is by default.
     */
    isDefaultColumnWidth(table, column, width) {
        // if table have metadata, we check if length is specified in column metadata
        if (this.connection.hasMetadata(table.name)) {
            const metadata = this.connection.getMetadata(table.name);
            const columnMetadata = metadata.findColumnWithDatabaseName(column.name);
            if (columnMetadata && columnMetadata.width)
                return false;
        }
        const defaultWidthForType = this.connection.driver.dataTypeDefaults &&
            this.connection.driver.dataTypeDefaults[column.type] &&
            this.connection.driver.dataTypeDefaults[column.type].width;
        if (defaultWidthForType) {
            // In MariaDB & MySQL 5.7, the default widths of certain numeric types are 1 less than
            // the usual defaults when the column is unsigned.
            // This also applies to Aurora MySQL.
            const typesWithReducedUnsignedDefault = [
                "int",
                "tinyint",
                "smallint",
                "mediumint",
            ];
            const needsAdjustment = typesWithReducedUnsignedDefault.indexOf(column.type) !== -1;
            if (column.unsigned && needsAdjustment) {
                return defaultWidthForType - 1 === width;
            }
            else {
                return defaultWidthForType === width;
            }
        }
        return false;
    }
    /**
     * Change table comment.
     */
    changeTableComment(tableOrName, comment) {
        throw new TypeORMError(`aurora-mysql driver does not support change table comment.`);
    }
}

//# sourceMappingURL=AuroraMysqlQueryRunner.js.map
