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Within Expo, all database operations happen in a\n * transaction context, so issuing a `BEGIN TRANSACTION` command is\n * redundant and will result in the following error:\n * \n * `Error: Error code 1: cannot start a transaction within a transaction`\n * \n * Instead, we keep track of a `Transaction` object in `this.transaction`\n * and continue using the same object until we wish to commit the\n * transaction.\n */\n async startTransaction(): Promise<void> {\n if (this.isTransactionActive && typeof this.transaction !== \"undefined\")\n throw new TransactionAlreadyStartedError();\n\n this.isTransactionActive = true;\n }\n\n /**\n * Commits transaction.\n * Error will be thrown if transaction was not started.\n * Since Expo will automatically commit the transaction once all the\n * callbacks of the transaction object have been completed, \"committing\" a\n * transaction in this driver's context means that we delete the transaction\n * object and set the stage for the next transaction.\n */\n async commitTransaction(): Promise<void> {\n if (!this.isTransactionActive && typeof this.transaction === \"undefined\")\n throw new TransactionNotStartedError();\n\n this.isTransactionActive = false;\n this.transaction = undefined;\n }\n\n /**\n * Rollbacks transaction.\n * Error will be thrown if transaction was not started.\n * This method's functionality is identical to `commitTransaction()` because\n * the transaction lifecycle is handled within the Expo transaction object.\n * Issuing separate statements for `COMMIT` or `ROLLBACK` aren't necessary.\n */\n async rollbackTransaction(): Promise<void> {\n if (!this.isTransactionActive && typeof this.transaction === \"undefined\")\n throw new TransactionNotStartedError();\n\n this.isTransactionActive = false;\n this.transaction = undefined;\n }\n\n /**\n * Executes a given SQL query.\n */\n query(query: string, parameters?: any[]): Promise<any> {\n if (this.isReleased)\n throw new QueryRunnerAlreadyReleasedError();\n\n return new Promise<any>(async (ok, fail) => {\n const databaseConnection = await this.connect();\n this.driver.connection.logger.logQuery(query, parameters, this);\n const queryStartTime = +new Date();\n // All Expo SQL queries are executed in a transaction context\n databaseConnection.transaction((transaction: ITransaction) => {\n if (typeof this.transaction === \"undefined\") {\n this.startTransaction();\n this.transaction = transaction;\n }\n this.transaction.executeSql(query, parameters, (t: ITransaction, result: IResultSet) => {\n // log slow queries if maxQueryExecution time is set\n const maxQueryExecutionTime = this.driver.connection.options.maxQueryExecutionTime;\n const queryEndTime = +new Date();\n const queryExecutionTime = queryEndTime - queryStartTime;\n if (maxQueryExecutionTime && queryExecutionTime > maxQueryExecutionTime) {\n this.driver.connection.logger.logQuerySlow(queryExecutionTime, query, parameters, this);\n }\n \n // return id of inserted row, if query was insert statement.\n if (query.substr(0, 11) === \"INSERT INTO\") {\n ok(result.insertId);\n }\n else {\n let resultSet = [];\n for (let i = 0; i < result.rows.length; i++) {\n resultSet.push(result.rows.item(i));\n }\n ok(resultSet);\n }\n }, (t: ITransaction, err: any) => {\n this.driver.connection.logger.logQueryError(err, query, parameters, this);\n fail(new QueryFailedError(query, parameters, err));\n });\n }, (err: any) => {\n this.rollbackTransaction();\n }, () => {\n this.isTransactionActive = false;\n this.transaction = undefined;\n });\n });\n }\n}\n"],"sourceRoot":"../.."}
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