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{CockroachDriver} from \"../driver/cockroachdb/CockroachDriver\";\nimport {OracleDriver} from \"../driver/oracle/OracleDriver\";\nimport {QueryBuilder} from \"./QueryBuilder\";\nimport {ObjectLiteral} from \"../common/ObjectLiteral\";\nimport {ObjectType} from \"../common/ObjectType\";\nimport {Connection} from \"../connection/Connection\";\nimport {QueryRunner} from \"../query-runner/QueryRunner\";\nimport {SqlServerDriver} from \"../driver/sqlserver/SqlServerDriver\";\nimport {PostgresDriver} from \"../driver/postgres/PostgresDriver\";\nimport {WhereExpression} from \"./WhereExpression\";\nimport {Brackets} from \"./Brackets\";\nimport {DeleteResult} from \"./result/DeleteResult\";\nimport {ReturningStatementNotSupportedError} from \"../error/ReturningStatementNotSupportedError\";\nimport {SqljsDriver} from \"../driver/sqljs/SqljsDriver\";\nimport {MysqlDriver} from \"../driver/mysql/MysqlDriver\";\nimport {BroadcasterResult} from \"../subscriber/BroadcasterResult\";\nimport {EntitySchema} from \"../index\";\n\n/**\n * Allows to build complex sql queries in a fashion way and execute those queries.\n */\nexport class DeleteQueryBuilder<Entity> extends QueryBuilder<Entity> implements WhereExpression {\n\n // -------------------------------------------------------------------------\n // Constructor\n // -------------------------------------------------------------------------\n\n constructor(connectionOrQueryBuilder: Connection|QueryBuilder<any>, queryRunner?: QueryRunner) {\n super(connectionOrQueryBuilder as any, queryRunner);\n this.expressionMap.aliasNamePrefixingEnabled = false;\n }\n\n // -------------------------------------------------------------------------\n // Public Implemented Methods\n // -------------------------------------------------------------------------\n\n /**\n * Gets generated sql query without parameters being replaced.\n */\n getQuery(): string {\n let sql = this.createDeleteExpression();\n return sql.trim();\n }\n\n /**\n * Executes sql generated by query builder and returns raw database results.\n */\n async execute(): Promise<DeleteResult> {\n const [sql, parameters] = this.getQueryAndParameters();\n const queryRunner = this.obtainQueryRunner();\n let transactionStartedByUs: boolean = false;\n\n try {\n\n // start transaction if it was enabled\n if (this.expressionMap.useTransaction === true && queryRunner.isTransactionActive === false) {\n await queryRunner.startTransaction();\n transactionStartedByUs = true;\n }\n\n // call before deletion methods in listeners and subscribers\n if (this.expressionMap.callListeners === true && this.expressionMap.mainAlias!.hasMetadata) {\n const broadcastResult = new BroadcasterResult();\n queryRunner.broadcaster.broadcastBeforeRemoveEvent(broadcastResult, this.expressionMap.mainAlias!.metadata);\n if (broadcastResult.promises.length > 0) await Promise.all(broadcastResult.promises);\n }\n\n // execute query\n const deleteResult = new DeleteResult();\n const result = await queryRunner.query(sql, parameters);\n\n const driver = queryRunner.connection.driver;\n if (driver instanceof MysqlDriver) {\n deleteResult.raw = result;\n deleteResult.affected = result.affectedRows;\n\n } else if (driver instanceof SqlServerDriver || driver instanceof PostgresDriver || driver instanceof CockroachDriver) {\n deleteResult.raw = result[0] ? result[0] : null;\n // don't return 0 because it could confuse. null means that we did not receive this value\n deleteResult.affected = typeof result[1] === \"number\" ? result[1] : null;\n\n } else if (driver instanceof OracleDriver) {\n deleteResult.affected = result;\n\n } else {\n deleteResult.raw = result;\n }\n\n // call after deletion methods in listeners and subscribers\n if (this.expressionMap.callListeners === true && this.expressionMap.mainAlias!.hasMetadata) {\n const broadcastResult = new BroadcasterResult();\n queryRunner.broadcaster.broadcastAfterRemoveEvent(broadcastResult, this.expressionMap.mainAlias!.metadata);\n if (broadcastResult.promises.length > 0) await Promise.all(broadcastResult.promises);\n }\n\n // close transaction if we started it\n if (transactionStartedByUs)\n await queryRunner.commitTransaction();\n\n return deleteResult;\n\n } catch (error) {\n\n // rollback transaction if we started it\n if (transactionStartedByUs) {\n try {\n await queryRunner.rollbackTransaction();\n } catch (rollbackError) { }\n }\n throw error;\n\n } finally {\n if (queryRunner !== this.queryRunner) { // means we created our own query runner\n await queryRunner.release();\n }\n if (this.connection.driver instanceof SqljsDriver && !queryRunner.isTransactionActive) {\n await this.connection.driver.autoSave();\n }\n }\n }\n\n // -------------------------------------------------------------------------\n // Public Methods\n // -------------------------------------------------------------------------\n\n /**\n * Specifies FROM which entity's table select/update/delete will be executed.\n * Also sets a main string alias of the selection data.\n */\n from<T>(entityTarget: ObjectType<T>|EntitySchema<T>|string, aliasName?: string): DeleteQueryBuilder<T> {\n entityTarget = entityTarget instanceof EntitySchema ? entityTarget.options.name : entityTarget;\n const mainAlias = this.createFromAlias(entityTarget, aliasName);\n this.expressionMap.setMainAlias(mainAlias);\n return (this as any) as DeleteQueryBuilder<T>;\n }\n\n /**\n * Sets WHERE condition in the query builder.\n * If you had previously WHERE expression defined,\n * calling this function will override previously set WHERE conditions.\n * Additionally you can add parameters used in where expression.\n */\n where(where: Brackets|string|((qb: this) => string)|ObjectLiteral|ObjectLiteral[], parameters?: ObjectLiteral): this {\n this.expressionMap.wheres = []; // don't move this block below since computeWhereParameter can add where expressions\n const condition = this.computeWhereParameter(where);\n if (condition)\n this.expressionMap.wheres = [{ type: \"simple\", condition: condition }];\n if (parameters)\n this.setParameters(parameters);\n return this;\n }\n\n /**\n * Adds new AND WHERE condition in the query builder.\n * Additionally you can add parameters used in where expression.\n */\n andWhere(where: Brackets|string|((qb: this) => string), parameters?: ObjectLiteral): this {\n this.expressionMap.wheres.push({ type: \"and\", condition: this.computeWhereParameter(where) });\n if (parameters) this.setParameters(parameters);\n return this;\n }\n\n /**\n * Adds new OR WHERE condition in the query builder.\n * Additionally you can add parameters used in where expression.\n */\n orWhere(where: Brackets|string|((qb: this) => string), parameters?: ObjectLiteral): this {\n this.expressionMap.wheres.push({ type: \"or\", condition: this.computeWhereParameter(where) });\n if (parameters) this.setParameters(parameters);\n return this;\n }\n\n /**\n * Adds new AND WHERE with conditions for the given ids.\n */\n whereInIds(ids: any|any[]): this {\n return this.where(this.createWhereIdsExpression(ids));\n }\n\n /**\n * Adds new AND WHERE with conditions for the given ids.\n */\n andWhereInIds(ids: any|any[]): this {\n return this.andWhere(this.createWhereIdsExpression(ids));\n }\n\n /**\n * Adds new OR WHERE with conditions for the given ids.\n */\n orWhereInIds(ids: any|any[]): this {\n return this.orWhere(this.createWhereIdsExpression(ids));\n }\n /**\n * Optional returning/output clause.\n * This will return given column values.\n */\n output(columns: string[]): this;\n\n /**\n * Optional returning/output clause.\n * Returning is a SQL string containing returning statement.\n */\n output(output: string): this;\n\n /**\n * Optional returning/output clause.\n */\n output(output: string|string[]): this;\n\n /**\n * Optional returning/output clause.\n */\n output(output: string|string[]): this {\n return this.returning(output);\n }\n\n /**\n * Optional returning/output clause.\n * This will return given column values.\n */\n returning(columns: string[]): this;\n\n /**\n * Optional returning/output clause.\n * Returning is a SQL string containing returning statement.\n */\n returning(returning: string): this;\n\n /**\n * Optional returning/output clause.\n */\n returning(returning: string|string[]): this;\n\n /**\n * Optional returning/output clause.\n */\n returning(returning: string|string[]): this {\n\n // not all databases support returning/output cause\n if (!this.connection.driver.isReturningSqlSupported())\n throw new ReturningStatementNotSupportedError();\n\n this.expressionMap.returning = returning;\n return this;\n }\n\n // -------------------------------------------------------------------------\n // Protected Methods\n // -------------------------------------------------------------------------\n\n /**\n * Creates DELETE express used to perform query.\n */\n protected createDeleteExpression() {\n const tableName = this.getTableName(this.getMainTableName());\n const whereExpression = this.createWhereExpression();\n const returningExpression = this.createReturningExpression();\n\n if (returningExpression && (this.connection.driver instanceof PostgresDriver || this.connection.driver instanceof CockroachDriver)) {\n return `DELETE FROM ${tableName}${whereExpression} RETURNING ${returningExpression}`;\n\n } else if (returningExpression !== \"\" && this.connection.driver instanceof SqlServerDriver) {\n return `DELETE FROM ${tableName} OUTPUT ${returningExpression}${whereExpression}`;\n\n } else {\n return `DELETE FROM ${tableName}${whereExpression}`;\n }\n }\n\n}\n"],"sourceRoot":".."}
|
