sequelize/lib/dialects/abstract/query-generator/transaction.js

Sequelize is a promise-based Node.js ORM tool for Postgres, MySQL, MariaDB, SQLite, Microsoft SQL Server, Amazon Redshift and Snowflake’s Data Cloud. It features solid transaction support, relations, eager and lazy loading, read replication and more.

'use strict';

const uuidv4 = require('uuid').v4;

const TransactionQueries = {
  /**
   * Returns a query that sets the transaction isolation level.
   *
   * @param  {string} value   The isolation level.
   * @param  {object} options An object with options.
   * @returns {string}         The generated sql query.
   * @private
   */
  setIsolationLevelQuery(value, options) {
    if (options.parent) {
      return;
    }

    return `SET TRANSACTION ISOLATION LEVEL ${value};`;
  },

  generateTransactionId() {
    return uuidv4();
  },

  /**
   * Returns a query that starts a transaction.
   *
   * @param  {Transaction} transaction
   * @returns {string}         The generated sql query.
   * @private
   */
  startTransactionQuery(transaction) {
    if (transaction.parent) {
      // force quoting of savepoint identifiers for postgres
      return `SAVEPOINT ${this.quoteIdentifier(transaction.name, true)};`;
    }

    return 'START TRANSACTION;';
  },

  deferConstraintsQuery() {},

  setConstraintQuery() {},
  setDeferredQuery() {},
  setImmediateQuery() {},

  /**
   * Returns a query that commits a transaction.
   *
   * @param  {Transaction} transaction An object with options.
   * @returns {string}         The generated sql query.
   * @private
   */
  commitTransactionQuery(transaction) {
    if (transaction.parent) {
      return;
    }

    return 'COMMIT;';
  },

  /**
   * Returns a query that rollbacks a transaction.
   *
   * @param  {Transaction} transaction
   * @returns {string}         The generated sql query.
   * @private
   */
  rollbackTransactionQuery(transaction) {
    if (transaction.parent) {
      // force quoting of savepoint identifiers for postgres
      return `ROLLBACK TO SAVEPOINT ${this.quoteIdentifier(transaction.name, true)};`;
    }

    return 'ROLLBACK;';
  }
};

module.exports = TransactionQueries;