init source

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

@@ -0,0 +1,80 @@
+'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;