Mysql支持事务处理

Mysql支持事务处理

转贴——让Mysql支持事务处理
摘自:http://www.web-bbs.com/forum/read.php?tid=15
在RedHat 7.2 下已经验证

一、在linux 6.2下安装
1.在mysql网站上下载稳定最大功能版本 （当前版本为 3.23.47-max）
2.注意你可以下载二进制版本没，而不需要编译；不必下载RPM版本
3.我们将安装mysql server到/usr/local下，故cd /usr/local
5.解开下载档案 tar zxvf /root/mysql-max-3.23.47-pc-linux-gnu-i686.tar.gz ./
6.有空你可以看看 INSTALL-BINARY，或直接按下面的步骤操作
7.
shell> groupadd mysql
shell> useradd -g mysql mysql
shell> cd /usr/local
shell> gunzip < /path/to/mysql-VERSION-OS.tar.gz | tar xvf -
shell> ln -s mysql-VERSION-OS mysql
shell> cd mysql
shell> scripts/mysql_install_db
shell> chown -R root /usr/local/mysql
shell> chown -R mysql /usr/local/mysql/data
shell> chgrp -R mysql /usr/local/mysql
shell> chown -R root /usr/local/mysql/bin
shell> vi startmysqld
上面这个命令是要编辑一个启动脚本，内容如下，不要包括虚线哦！
#---不要这一行--------------------------------------------------------------------
#!/bin/sh
cd /usr/local/mysql
./bin/safe_mysqld --user=mysql &
cd -
#---不要这一行---------------------------------------------------------------------
shell> chmod 775 startmysqld
shell> vi /etc/rc.d/rc.local
上面这个命令是准备把启动mysql命令加入系统启动文件中，这样机器一启动完，mysql server也就启动了，在文件的最后一行加入：/usr/local/mysql/bin/startmysqld，关闭vi退出。
shell>startmysqd
这时出现下面的消息，如果没有报错就继续8，否则检查上面的步骤
Starting mysqld daemon with databases from /usr/local/mysql-max-3.23.47-pc-linux-gnu-i686/data
8. shell>mysqladmin -uroot shutdown
9. shell>cd /usr/local/mysql
shell>cp support-files/my-small.cnf data/my.cnf
shell>vi data/my.cnf
这里把innodb开关打开，去掉那些#象下面一样。
innodb_data_home_dir = /usr/local/mysql/var/
innodb_data_file_path = ibdata1:100M
innodb_data_home_dir = /usr/local/mysql/var/
innodb_log_group_home_dir = /usr/local/mysql/var/
innodb_log_arch_dir = /usr/local/mysql/var/
set-variable = innodb_mirrored_log_groups=1
set-variable = innodb_log_files_in_group=3
set-variable = innodb_log_file_size=5M
set-variable = innodb_log_buffer_size=8M
innodb_flush_log_at_trx_commit=1
innodb_log_archive=0
set-variable = innodb_buffer_pool_size=16M
set-variable = innodb_additional_mem_pool_size=2M
set-variable = innodb_file_io_threads=4
set-variable = innodb_lock_wait_timeout=50
上面的配置把innodb的数据，日志等文件都保存在/usr/local/mysql/var下，下面就要创建这个目录了
10. shell>mkdir var
shell>chown mysql.mysql var
shell>chmod g+w var
注意要使得改目录mysql用户能写，innodb不会自动创建目录
11. shell>startmysqld
shell>mysql -uroot
希望你能看到：

mysql> show variables like "have_%";
+-------------------+--------+
| Variable_name | Value |
+-------------------+--------+
| have_bdb | YES |
| have_gemini | NO |
| have_innodb | YES |
| have_isam | YES |
| have_raid | NO |
| have_openssl | NO |
+-------------------+--------+
6 rows in set (0.00 sec)

如果是这样的，那么我们就可以创建一张支持事务处理的表来试试了
1.mysqladmin -uroot creat innodb 创建一个数据库
2.mysql innodb 进入mysql client

mysql> CREATE TABLE CUSTOMER (A INT, B CHAR (20), INDEX (A)) TYPE = InnoDB;
Query OK, 0 rows affected (0.02 sec)
mysql> set autocommit=0;
Query OK, 0 rows affected (0.00 sec)
mysql> INSERT INTO CUSTOMER VALUES(0,"Rainman");
Query OK, 1 row affected (0.00 sec)
mysql> COMMIT;
Query OK, 0 rows affected (0.02 sec)
mysql> SELECT * FROM CUSTOMER;
+------+---------+
| A | B |
+------+---------+
| 0 | Rainman |
+------+---------+
1 row in set (0.01 sec)
mysql> INSERT INTO CUSTOMER VALUES(1,"Rainman2");
Query OK, 1 row affected (0.00 sec)
mysql> SELECT * FROM CUSTOMER;
+------+----------+
| A | B |
+------+----------+
| 0 | Rainman |
| 1 | Rainman2 |
+------+----------+
2 rows in set (0.00 sec)
mysql> ROLLBACK;
Query OK, 0 rows affected (0.02 sec)
mysql> SELECT * FROM CUSTOMER;
+------+---------+
| A | B |
+------+---------+
| 0 | Rainman |
+------+---------+
1 row in set (0.00 sec)
mysql> COMMIT;