Normalize setAutocommit/setIsolation level for postgres/mysql

lib/dialects/abstract/query-generator.js

@@ -537,11 +537,11 @@ module.exports = (function() {
      * @return {String}        The generated sql query.
      */
     setAutocommitQuery: function(value) {
-      throwMethodUndefined('setAutocommitQuery')
+      return "SET autocommit = " + (!!value ? 1 : 0) + ";"
     },
 
     setIsolationLevelQuery: function(value) {
-      throwMethodUndefined('setIsolationLevelQuery')
+      return "SET SESSION TRANSACTION ISOLATION LEVEL " + value + ";"
     },
 
     /**

lib/dialects/mysql/query-generator.js

@@ -303,20 +303,6 @@ module.exports = (function() {
     /**
      * Returns a query that starts a transaction.
      *
-     * @param  {Boolean} value A boolean that states whether autocommit shall be done or not.
-     * @return {String}        The generated sql query.
-     */
-    setAutocommitQuery: function(value) {
-      return "SET autocommit = " + (!!value ? 1 : 0) + ";"
-    },
-
-    setIsolationLevelQuery: function(value) {
-      return "SET SESSION TRANSACTION ISOLATION LEVEL " + value + ";"
-    },
-
-    /**
-     * Returns a query that starts a transaction.
-     *
      * @param  {Object} options An object with options.
      * @return {String}         The generated sql query.
      */

lib/dialects/postgres/query-generator.js

@@ -860,20 +860,6 @@ module.exports = (function() {
     /**
      * Returns a query that starts a transaction.
      *
-     * @param  {Boolean} value A boolean that states whether autocommit shall be done or not.
-     * @return {String}        The generated sql query.
-     */
-    setAutocommitQuery: function(value) {
-      return "SET autocommit = " + (!!value ? 1 : 0) + ";"
-    },
-
-    setIsolationLevelQuery: function(value) {
-      return "SET SESSION TRANSACTION ISOLATION LEVEL " + value + ";"
-    },
-
-    /**
-     * Returns a query that starts a transaction.
-     *
      * @param  {Object} options An object with options.
      * @return {String}         The generated sql query.
      */