Learn how to use rollback in SQL transactions to maintain data integrity by undoing changes if an error occurs during execution.
SQL>ALTERSYSTEMSETundo_tablespace='undotbs1'; System altered. --紧接着在该回话中删除undo2,提示正在使用 SQL>DROPTABLESPACE undo2; DROPTABLESPACE undo2 * ERROR at line 1: ORA-30013:undo tablespace'UNDO2'iscurrentlyinuse --在session1中提交事务 SQL>COMMIT; Commitcomplete. --在session2中再次删...
The rollback SQL statement is used to manually rollback transactions in MS SQL Server. 回滚SQL语句用于在MS SQL Server中手动回滚事务。 Transactions in SQL Server are used to execute a set of SQL statements in a group. With transactions, either all the statements in a group execute or none o...
使用数据库 —— USE 数据库名称 了解数据库 —— SHOW 数据库名称 查看数据库中的表 —— SHOW TABLES 查看表中列的消息 —— SHOW COLIMNS from 表名(DESCRIBE 表名) 自动增量 ——AUTO_INCREMENT 主键—— PRIMARY KEY 第4章检索数据库 SELECT语句: 检索一个列: SELECT 列名 FROM 表名 检索多个列: S...
In this tutorial, we’ll learn how to use COMMIT, ROLLBACK, and SAVEPOINT to run a user-managed transaction within a MySQL database. 2. Transactions A database transaction is a unit of SQL work. Furthermore, each SQL statement runs within a separate transaction by default. Therefore, these...
SQL Көшіру USE tempdb; GO CREATE TABLE ValueTable ([value] INT); GO DECLARE @TransactionName VARCHAR(20) = 'Transaction1'; BEGIN TRANSACTION @TransactionName INSERT INTO ValueTable VALUES (1), (2); ROLLBACK TRANSACTION @TransactionName; INSERT INTO ValueTable VALUES (3), (4)...
要使用多语句事务,请使用 SQL 语句 SET autocommit = 0 关闭自动提交,并根据需要使用 COMMIT 或 ROLLBACK 结束每个事务。要启用自动提交,请以 START TRANSACTION 开始每个事务,并以 COMMIT 或 ROLLBACK 结束它。以下示例显示了两个事务。第一个是提交的;第二个是回滚。 To use multiple-statement transactions, sw...
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The following example creates aSqlConnectionand aSqlTransaction. It also demonstrates how to use theBeginTransaction(),Commit(), andRollback()methods. The transaction is rolled back on any error.Try/Catcherror handling is used to handle any errors when attempting to commit or roll back the trans...
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