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Merged
merged 5 commits into from
May 25, 2020
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*: udpate begin and commit statements #3301

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59e8b5a
*: udpate `begin` and `commit` statements
zimulala May 22, 2020
3c45080
Merge branch 'pingcap/docs-special-week' into zimuxia/txn-sql
zimulala May 25, 2020
2a7868e
Merge branch 'docs-special-week' into txn
zimulala May 25, 2020
9d613ac
Update wording
lilin90 May 25, 2020
43b201a
Merge branch 'docs-special-week' into txn
lilin90 May 25, 2020
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Binary file modified media/sqlgram/BeginTransactionStmt.png
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4 changes: 3 additions & 1 deletion sql-statements/sql-statement-begin.md
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Expand Up @@ -61,10 +61,12 @@ Query OK, 0 rows affected (0.01 sec)

## MySQL 兼容性

`BEGIN` 语句与 MySQL 完全兼容。如有任何兼容性差异，请在 GitHub 上[提交 issue](/report-issue.md)。
TiDB 在执行 `BEGIN` 语句时，可以带上 `PESSIMISTIC` 或者 `OPTIMISTIC` 选项表明此语句开启事务的类型。

## 另请参阅

* [COMMIT](/sql-statements/sql-statement-commit.md)
* [ROLLBACK](/sql-statements/sql-statement-rollback.md)
* [START TRANSACTION](/sql-statements/sql-statement-start-transaction.md)
* [TiDB 乐观事务模型](/optimistic-transaction.md)
* [TiDB 悲观事务模型](/pessimistic-transaction.md)
7 changes: 5 additions & 2 deletions sql-statements/sql-statement-commit.md
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Expand Up @@ -17,6 +17,10 @@ aliases: ['/docs-cn/dev/reference/sql/statements/commit/']

![CommitStmt](/media/sqlgram/CommitStmt.png)

**CompletionTypeWithinTransaction:**

![CompletionTypeWithinTransaction](/media/sqlgram/CompletionTypeWithinTransaction.png)

## 示例

{{< copyable "sql" >}}
Expand Down Expand Up @@ -61,8 +65,7 @@ Query OK, 0 rows affected (0.01 sec)

## MySQL 兼容性

* 在 MySQL 中，除了有多个 primary 的群组复制以外，`COMMIT` 语句通常不会导致错误。相比之下，TiDB 使用乐观并发控制，冲突可能导致 `COMMIT` 返回错误。
* 默认情况下，`UNIQUE` 和 `PRIMARY KEY` 约束检查将延迟直至语句提交。可通过设置 `tidb_constraint_check_in_place=TRUE` 来改变该行为。
* 对于 `COMMIT` 语句中的 `CompletionTypeWithinTransaction` 选项，目前只在语法上支持。

## 另请参阅

Expand Down