| // Licensed to the Apache Software Foundation (ASF) under one or more |
| // contributor license agreements. See the NOTICE file distributed with |
| // this work for additional information regarding copyright ownership. |
| // The ASF licenses this file to You under the Apache License, Version 2.0 |
| // (the "License"); you may not use this file except in compliance with |
| // the License. You may obtain a copy of the License at |
| // |
| // http://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, software |
| // distributed under the License is distributed on an "AS IS" BASIS, |
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| // See the License for the specific language governing permissions and |
| // limitations under the License. |
| = Transactions |
| |
| IMPORTANT: Support for link:transactions/mvcc[SQL transactions] is currently in the beta stage. For production use, consider key-value transactions. |
| |
| Ignite supports the following statements that allow users to start, commit, or rollback a transaction. |
| |
| [source,sql] |
| ---- |
| BEGIN [TRANSACTION] |
| |
| COMMIT [TRANSACTION] |
| |
| ROLLBACK [TRANSACTION] |
| ---- |
| |
| - The `BEGIN` statement begins a new transaction. |
| - `COMMIT` commits the current transaction. |
| - `ROLLBACK` rolls back the current transaction. |
| |
| NOTE: DDL statements are not supported inside transactions. |
| |
| == Description |
| |
| The `BEGIN`, `COMMIT` and `ROLLBACK` commands allow you to manage SQL Transactions. A transaction is a sequence of SQL operations that starts with the `BEGIN` statement and ends with the `COMMIT` statement. Either all of the operations in a transaction succeed or they all fail. |
| |
| The `ROLLBACK [TRANSACTION]` statement undoes all updates made since the last time a `COMMIT` or `ROLLBACK` command was issued. |
| |
| == Example |
| Add a person and update the city population by 1 in a single transaction. |
| |
| [source,sql] |
| ---- |
| BEGIN; |
| |
| INSERT INTO Person (id, name, city_id) VALUES (1, 'John Doe', 3); |
| |
| UPDATE City SET population = population + 1 WHERE id = 3; |
| |
| COMMIT; |
| ---- |
| |
| Roll back the changes made by the previous commands. |
| |
| [source,sql] |
| ---- |
| BEGIN; |
| |
| INSERT INTO Person (id, name, city_id) VALUES (1, 'John Doe', 3); |
| |
| UPDATE City SET population = population + 1 WHERE id = 3; |
| ---- |
| |
