文章目錄
#相關免費學習推薦：mysql影片教學
一、MySQL的事務控制(Transaction Control Language)
(1)事務的特性(ACID)
事務指的是邏輯上的一組操作，組成這組操作的邏輯單元要麼一起成功，要麼一起失敗。
(2)MySQL的交易控制
set autocommit = false;
rollback;
commit ;
#(3)mysql事務示範
☆查看已經存在的emp表：
mysql> select * from emp;+-------+--------+--------+------+------------+----------+--------+--------+| empno | ename | job | mgr | hiredate | sal | commit | deptno |+-------+--------+--------+------+------------+----------+--------+--------+| 1002 | 白展堂 | clerk | 1001 | 1983-05-09 | 7000.00 | 200.00 | 10 || 1003 | 李大嘴 | clerk | 1002 | 1980-07-08 | 8000.00 | 100.00 | 10 || 1004 | 吕秀才 | clerk | 1002 | 1985-11-12 | 4000.00 | NULL | 10 || 1005 | 郭芙蓉 | clerk | 1002 | 1985-03-04 | 4000.00 | NULL | 10 || 1007 | 小白 | clerk | 1001 | 2019-11-25 | 5555.00 | 500.00 | NULL || 2001 | 胡一菲 | leader | NULL | 1994-03-04 | 15000.00 | NULL | 20 || 2002 | 陈美嘉 | manger | 2001 | 1993-05-24 | 10000.00 | 300.00 | 20 || 2003 | 吕子乔 | clerk | 2002 | 1995-05-19 | 7300.00 | 100.00 | 20 || 2004 | 张伟 | clerk | 2002 | 1994-10-12 | 8000.00 | 500.00 | 20 || 2005 | 曾小贤 | clerk | 2002 | 1993-05-10 | 9000.00 | 700.00 | 20 || 3001 | 刘梅 | leader | NULL | 1968-08-08 | 13000.00 | NULL | 30 || 3002 | 夏冬梅 | manger | 3001 | 1968-09-21 | 10000.00 | 600.00 | 30 || 3003 | 夏雪 | clerk | 3002 | 1989-09-21 | 8000.00 | 300.00 | 30 || 3004 | 张一山 | clerk | 3002 | 1991-06-16 | 8000.00 | 200.00 | 30 || 3007 | 嫦娥 | clerk | NULL | NULL | NULL | NULL | 10 |+-------+--------+--------+------+------------+----------+--------+--------+15 rows in set (0.00 sec)
①設定手動提交：
mysql> set autocommit=false;Query OK, 0 rows affected (0.03 sec)
②在emp表中插入一則ename為mary的語句：
mysql> insert into emp(ename,job,commit)
-> values('mary','clerk',300);Query OK, 1 row affected (0.02 sec)mysql> select * from emp;+-------+--------+--------+------+------------+----------+--------+--------+| empno | ename | job | mgr | hiredate | sal | commit | deptno |+-------+--------+--------+------+------------+----------+--------+--------+| 1002 | 白展堂 | clerk | 1001 | 1983-05-09 | 7000.00 | 200.00 | 10 || 1003 | 李大嘴 | clerk | 1002 | 1980-07-08 | 8000.00 | 100.00 | 10 || 1004 | 吕秀才 | clerk | 1002 | 1985-11-12 | 4000.00 | NULL | 10 || 1005 | 郭芙蓉 | clerk | 1002 | 1985-03-04 | 4000.00 | NULL | 10 || 1007 | 小白 | clerk | 1001 | 2019-11-25 | 5555.00 | 500.00 | NULL || 2001 | 胡一菲 | leader | NULL | 1994-03-04 | 15000.00 | NULL | 20 || 2002 | 陈美嘉 | manger | 2001 | 1993-05-24 | 10000.00 | 300.00 | 20 || 2003 | 吕子乔 | clerk | 2002 | 1995-05-19 | 7300.00 | 100.00 | 20 || 2004 | 张伟 | clerk | 2002 | 1994-10-12 | 8000.00 | 500.00 | 20 || 2005 | 曾小贤 | clerk | 2002 | 1993-05-10 | 9000.00 | 700.00 | 20 || 3001 | 刘梅 | leader | NULL | 1968-08-08 | 13000.00 | NULL | 30 || 3002 | 夏冬梅 | manger | 3001 | 1968-09-21 | 10000.00 | 600.00 | 30 || 3003 | 夏雪 | clerk | 3002 | 1989-09-21 | 8000.00 | 300.00 | 30 || 3004 | 张一山 | clerk | 3002 | 1991-06-16 | 8000.00 | 200.00 | 30 || 3007 | 嫦娥 | clerk | NULL | NULL | NULL | NULL | 10 || 4008 | mary | clerk | NULL | NULL | NULL | 300.00 | NULL |+-------+--------+--------+------+------------+----------+--------+--------+16 rows in set (0.00 sec)③使用rollback回滾
mysql> rollback;Query OK, 0 rows affected (0.00 sec)mysql> select * from emp;+-------+--------+--------+------+------------+----------+--------+--------+| empno | ename | job | mgr | hiredate | sal | commit | deptno |+-------+--------+--------+------+------------+----------+--------+--------+| 1002 | 白展堂 | clerk | 1001 | 1983-05-09 | 7000.00 | 200.00 | 10 || 1003 | 李大嘴 | clerk | 1002 | 1980-07-08 | 8000.00 | 100.00 | 10 || 1004 | 吕秀才 | clerk | 1002 | 1985-11-12 | 4000.00 | NULL | 10 || 1005 | 郭芙蓉 | clerk | 1002 | 1985-03-04 | 4000.00 | NULL | 10 || 1007 | 小白 | clerk | 1001 | 2019-11-25 | 5555.00 | 500.00 | NULL || 2001 | 胡一菲 | leader | NULL | 1994-03-04 | 15000.00 | NULL | 20 || 2002 | 陈美嘉 | manger | 2001 | 1993-05-24 | 10000.00 | 300.00 | 20 || 2003 | 吕子乔 | clerk | 2002 | 1995-05-19 | 7300.00 | 100.00 | 20 || 2004 | 张伟 | clerk | 2002 | 1994-10-12 | 8000.00 | 500.00 | 20 || 2005 | 曾小贤 | clerk | 2002 | 1993-05-10 | 9000.00 | 700.00 | 20 || 3001 | 刘梅 | leader | NULL | 1968-08-08 | 13000.00 | NULL | 30 || 3002 | 夏冬梅 | manger | 3001 | 1968-09-21 | 10000.00 | 600.00 | 30 || 3003 | 夏雪 | clerk | 3002 | 1989-09-21 | 8000.00 | 300.00 | 30 || 3004 | 张一山 | clerk | 3002 | 1991-06-16 | 8000.00 | 200.00 | 30 || 3007 | 嫦娥 | clerk | NULL | NULL | NULL | NULL | 10 |+-------+--------+--------+------+------------+----------+--------+--------+15 rows in set (0.00 sec)
發現mary沒有插入成功，因為手動提交後進行和回滾；如果使用commit進行提交就無法回滾成功，因為直接插入進資料庫中了。
二、JDBC的交易控制
(1)JDBC交易簡介
(2)JDBC交易的API
conn.setAutoCommit(false);//将JDBC事务设置手动提交conn.commit();conn.rollback();
(3)JDBC交易控制模擬
(模擬交易)TrasactionDemo：#####在emp表中修改ename名為hellen的記錄,將其job從leader修改為clerk,獎金commit從600降低至300。
package jdbc;import java.sql.Connection;import java.sql.PreparedStatement;import java.sql.SQLException;import util.JdbcUtil;/**
* JDBC事务控制
*
* @author Administrator
*
*/public class TestTrasaction {
public static void main(String[] args) {
Connection conn = null;
PreparedStatement pstm = null;
PreparedStatement pstm1 = null;
try {
// 获得连接
conn = JdbcUtil.getConnection();
//将JDBC事务设置手动提交
conn.setAutoCommit(false);
// ①降职操作
String sql = "updata emp set job = 'clerk' where ename = 'hellen'";
pstm = conn.prepareStatement(sql);
pstm.executeUpdate();
// ②降奖金操作
String sql1 = "updata emp set commit='3000' where ename = 'hellen'";
pstm1 = conn.prepareStatement(sql1);
pstm1.executeUpdate();
//提交事务
conn.commit();
} catch (Exception e) {
//事务回滚
try {
conn.rollback();
} catch (SQLException e1) {
e1.printStackTrace();
}
} finally {
try {
JdbcUtil.release(null, pstm, null);
JdbcUtil.release(null, pstm1, conn);
} catch (Exception e) {
e.printStackTrace();
}
}
}}以上是介紹MySQL和JDBC的事務控制(TCL)的詳細內容。更多資訊請關注PHP中文網其他相關文章！
