\u4e8b\u52a1\u5904\u7406\u5728\u5404\u79cd\u7ba1\u7406\u7cfb\u7edf\u4e2d\u90fd\u6709\u7740\u5e7f\u6cdb\u7684\u5e94\u7528\uff0c\u6bd4\u5982\u4eba\u5458\u7ba1\u7406\u7cfb\u7edf\uff0c\u5f88\u591a\u540c\u6b65\u6570\u636e\u5e93\u64cd\u4f5c\u5927\u90fd\u9700\u8981\u7528\u5230\u4e8b\u52a1\u5904\u7406\u3002\u6bd4\u5982\u8bf4\uff0c\u5728\u4eba\u5458\u7ba1\u7406\u7cfb\u7edf\u4e2d\uff0c\u4f60\u5220\u9664\u4e00\u4e2a\u4eba\u5458\uff0c\u4f60\u5373\u9700\u8981\u5220\u9664\u4eba\u5458\u7684\u57fa\u672c\u8d44\u6599\uff0c\u4e5f\u8981\u5220\u9664\u548c\u8be5\u4eba\u5458\u76f8\u5173\u7684\u4fe1\u606f\uff0c\u5982\u4fe1\u7bb1\uff0c\u6587\u7ae0\u7b49\u7b49\uff0c\u8fd9\u6837\uff0c\u8fd9\u4e9b\u6570\u636e\u5e93\u64cd\u4f5c\u8bed\u53e5\u5c31\u6784\u6210\u4e00\u4e2a\u4e8b\u52a1\uff01
\u5220\u9664\u7684SQL\u8bed\u53e5
delete from userinfo where ~~~
delete from mail where ~~
delete from article where~~
~~
\u5982\u679c\u6ca1\u6709\u4e8b\u52a1\u5904\u7406\uff0c\u5728\u4f60\u5220\u9664\u7684\u8fc7\u7a0b\u4e2d\uff0c\u5047\u8bbe\u51fa\u9519\u4e86\uff0c\u53ea\u6267\u884c\u4e86\u7b2c\u4e00\u53e5\uff0c\u90a3\u4e48\u5176\u540e\u679c\u662f\u96be\u4ee5\u60f3\u8c61\u7684\uff01
\u4f46\u7528\u4e8b\u52a1\u5904\u7406\u3002\u5982\u679c\u5220\u9664\u51fa\u9519\uff0c\u4f60\u53ea\u8981rollback\u5c31\u53ef\u4ee5\u53d6\u6d88\u5220\u9664\u64cd\u4f5c\uff08\u5176\u5b9e\u662f\u53ea\u8981\u4f60\u6ca1\u6709commit\u4f60\u5c31\u6ca1\u6709\u786e\u5b9e\u7684\u6267\u884c\u8be5\u5220\u9664\u64cd\u4f5c\uff09<\/p>\n
\u4e00\u822c\u6765\u8bf4\uff0c\u5728\u5546\u52a1\u7ea7\u7684\u5e94\u7528\u4e2d\uff0c\u90fd\u5fc5\u987b\u8003\u8651\u4e8b\u52a1\u5904\u7406\u7684\uff01<\/p>\n
MYSQL\u7684\u4e8b\u52a1\u5904\u7406\u529f\u80fd\uff01
\u4e00\u76f4\u4ee5\u6765\u6211\u90fd\u4ee5\u4e3aMYSQL\u4e0d\u652f\u6301\u4e8b\u52a1\u5904\u7406\uff0c\u6240\u4ee5\u5728\u5904\u7406\u591a\u4e2a\u6570\u636e\u8868\u7684\u6570\u636e\u65f6\uff0c\u4e00\u76f4\u90fd\u5f88\u9ebb\u70e6\uff08\u6211\u662f\u4e0d\u5f97\u4e0d\u5c06\u5176\u5199\u5165\u6587\u672c\u6587\u4ef6\uff0c\u5728\u7cfb\u7edf\u91cd\u65b0\u52a0\u8f7d\u5f97\u65f6\u5019\u624d\u5199\u5165\u6570\u636e\u5e93\u4ee5\u9632\u51fa\u9519\uff09\uff5e\u4eca\u5929\u53d1\u73b0MYSQL\u6570\u636e\u5e93\u4ece4.1\u5c31\u5f00\u59cb\u652f\u6301\u4e8b\u52a1\u529f\u80fd\uff0c\u636e\u8bf45.0\u5c06\u5f15\u5165\u5b58\u50a8\u8fc7\u7a0b^_^
\u5148\u7b80\u5355\u4ecb\u7ecd\u4e00\u4e0b\u4e8b\u52a1\u5427\uff01\u4e8b\u52a1\u662fDBMS\u5f97\u6267\u884c\u5355\u4f4d\u3002\u5b83\u7531\u6709\u9650\u5f97\u6570\u636e\u5e93\u64cd\u4f5c\u5e8f\u5217\u7ec4\u6210\u5f97\u3002\u4f46\u4e0d\u662f\u4efb\u610f\u5f97\u6570\u636e\u5e93\u64cd\u4f5c\u5e8f\u5217\u90fd\u80fd\u6210\u4e3a\u4e8b\u52a1\u3002\u4e00\u822c\u6765\u8bf4\uff0c\u4e8b\u52a1\u662f\u5fc5\u987b\u6ee1\u8db34\u4e2a\u6761\u4ef6\uff08ACID\uff09
\u539f\u5b50\u6027\uff08Autmic\uff09\uff1a\u4e8b\u52a1\u5728\u6267\u884c\u6027\uff0c\u8981\u505a\u5230\u201c\u8981\u4e48\u4e0d\u505a\uff0c\u8981\u4e48\u5168\u505a\uff01\u201d\uff0c\u5c31\u662f\u8bf4\u4e0d\u5141\u8bb8\u4e8b\u52a1\u90e8\u5206\u5f97\u6267\u884c\u3002\u5373\u4f7f\u56e0\u4e3a\u6545\u969c\u800c\u4f7f\u4e8b\u52a1\u4e0d\u80fd\u5b8c\u6210\uff0c\u5728rollback\u65f6\u4e5f\u8981\u6d88\u9664\u5bf9\u6570\u636e\u5e93\u5f97\u5f71\u54cd\uff01
\u4e00\u81f4\u6027\uff08Consistency\uff09\uff1a\u4e8b\u52a1\u5f97\u64cd\u4f5c\u5e94\u8be5\u4f7f\u4f7f\u6570\u636e\u5e93\u4ece\u4e00\u4e2a\u4e00\u81f4\u72b6\u6001\u8f6c\u53d8\u5012\u53e6\u4e00\u4e2a\u4e00\u81f4\u5f97\u72b6\u6001\uff01\u5c31\u62ff\u7f51\u4e0a\u8d2d\u7269\u6765\u8bf4\u5427\uff0c\u4f60\u53ea\u6709\u5373\u8ba9\u5546\u54c1\u51fa\u5e93\uff0c\u53c8\u8ba9\u5546\u54c1\u8fdb\u5165\u987e\u5ba2\u5f97\u8d2d\u7269\u7bee\u624d\u80fd\u6784\u6210\u4e8b\u52a1\uff01
\u9694\u79bb\u6027\uff08Isolation\uff09\uff1a\u5982\u679c\u591a\u4e2a\u4e8b\u52a1\u5e76\u53d1\u6267\u884c\uff0c\u5e94\u8c61\u5404\u4e2a\u4e8b\u52a1\u72ec\u7acb\u6267\u884c\u4e00\u6837\uff01
\u6301\u4e45\u6027\uff08Durability\uff09\uff1a\u4e00\u4e2a\u6210\u529f\u6267\u884c\u5f97\u4e8b\u52a1\u5bf9\u6570\u636e\u5e93\u5f97\u4f5c\u7528\u662f\u6301\u4e45\u5f97\uff0c\u5373\u4f7f\u6570\u636e\u5e93\u5e94\u6545\u969c\u51fa\u9519\uff0c\u4e5f\u5e94\u8be5\u80fd\u591f\u6062\u590d\uff01
MYSQL\u7684\u4e8b\u52a1\u5904\u7406\u4e3b\u8981\u6709\u4e24\u79cd\u65b9\u6cd5\u3002
1\u3001\u7528begin,rollback,commit\u6765\u5b9e\u73b0
begin \u5f00\u59cb\u4e00\u4e2a\u4e8b\u52a1
rollback \u4e8b\u52a1\u56de\u6eda
commit \u4e8b\u52a1\u786e\u8ba4
2\u3001\u76f4\u63a5\u7528set\u6765\u6539\u53d8mysql\u7684\u81ea\u52a8\u63d0\u4ea4\u6a21\u5f0f
MYSQL\u9ed8\u8ba4\u662f\u81ea\u52a8\u63d0\u4ea4\u7684\uff0c\u4e5f\u5c31\u662f\u4f60\u63d0\u4ea4\u4e00\u4e2aQUERY\uff0c\u5b83\u5c31\u76f4\u63a5\u6267\u884c\uff01\u6211\u4eec\u53ef\u4ee5\u901a\u8fc7
set autocommit=0 \u7981\u6b62\u81ea\u52a8\u63d0\u4ea4
set autocommit=1 \u5f00\u542f\u81ea\u52a8\u63d0\u4ea4
\u6765\u5b9e\u73b0\u4e8b\u52a1\u7684\u5904\u7406\u3002
\u4f46\u6ce8\u610f\u5f53\u4f60\u7528 set autocommit=0 \u7684\u65f6\u5019\uff0c\u4f60\u4ee5\u540e\u6240\u6709\u7684SQL\u90fd\u5c06\u505a\u4e3a\u4e8b\u52a1\u5904\u7406\uff0c\u76f4\u5230\u4f60\u7528commit\u786e\u8ba4\u6216rollback\u7ed3\u675f\uff0c\u6ce8\u610f\u5f53\u4f60\u7ed3\u675f\u8fd9\u4e2a\u4e8b\u52a1\u7684\u540c\u65f6\u4e5f\u5f00\u542f\u4e86\u4e2a\u65b0\u7684\u4e8b\u52a1\uff01\u6309\u7b2c\u4e00\u79cd\u65b9\u6cd5\u53ea\u5c06\u5f53\u524d\u7684\u4f5c\u4e3a\u4e00\u4e2a\u4e8b\u52a1\uff01
\u4e2a\u4eba\u63a8\u8350\u4f7f\u7528\u7b2c\u4e00\u79cd\u65b9\u6cd5\uff01
MYSQL\u4e2d\u53ea\u6709INNODB\u548cBDB\u7c7b\u578b\u7684\u6570\u636e\u8868\u624d\u80fd\u652f\u6301\u4e8b\u52a1\u5904\u7406\uff01\u5176\u4ed6\u7684\u7c7b\u578b\u662f\u4e0d\u652f\u6301\u7684\uff01\uff08\u5207\u8bb0\uff01\uff09<\/i><\/p>\n
\u4f8b\u5b50\uff1a
mysql> use test;
Database changed
mysql> CREATE TABLE `dbtest`(
-> id int(4)
-> ) TYPE=INNODB;
Query OK, 0 rows affected, 1 warning (0.05 sec)<\/p>\n
mysql> select * from dbtest
-> ;
Empty set (0.01 sec)<\/p>\n
mysql> begin;
Query OK, 0 rows affected (0.00 sec)<\/p>\n
mysql> insert into dbtest value(5);
Query OK, 1 row affected (0.00 sec)<\/p>\n
mysql> insert into dbtest value(6);
Query OK, 1 row affected (0.00 sec)<\/p>\n
mysql> commit;
Query OK, 0 rows affected (0.00 sec)<\/p>\n
mysql> select * from dbtest;
+——+
| id |
+——+
| 5 |
| 6 |
+——+
2 rows in set (0.00 sec)<\/p>\n
mysql> begin;
Query OK, 0 rows affected (0.00 sec)<\/p>\n
mysql> insert into dbtest values(7);
Query OK, 1 row affected (0.00 sec)<\/p>\n
mysql> rollback;
Query OK, 0 rows affected (0.00 sec)<\/p>\n
mysql> select * from dbtest;
+——+
| id |
+——+
| 5 |
| 6 |
+——+
2 rows in set (0.00 sec)<\/p>\n
mysql><\/p>\n
*************************************************<\/p>\n
[PHP]
function Tran( $sql ) {
$judge = 1;
mysql_query(‘begin’);
foreach ($sql as $v) {
if ( !mysql_query($v) ) {
$judge = 0;
}
}
if ($judge == 0) {
mysql_query(‘rollback’);
return false;
}
elseif ($judge == 1) {
mysql_query(‘commit’);
return true;
}
}
[\/PHP]<\/p>\n
************************************************<\/p>\n
<?php
$handler=mysql_connect(“localhost”,”root”,””);
mysql_select_db(“task”);
mysql_query(“SET AUTOCOMMIT=0”);\/\/\u8bbe\u7f6e\u4e3a\u4e0d\u81ea\u52a8\u63d0\u4ea4\uff0c\u56e0\u4e3aMYSQL\u9ed8\u8ba4\u7acb\u5373\u6267\u884c
mysql_query(“BEGIN”);\/\/\u5f00\u59cb\u4e8b\u52a1\u5b9a\u4e49
if(!mysql_query(“insert into trans (id) values(‘2’)”))
{
mysql_query(“ROOLBACK”);\/\/\u5224\u65ad\u5f53\u6267\u884c\u5931\u8d25\u65f6\u56de\u6eda
}
if(!mysql_query(“insert into trans (id) values(‘4’)”))
{
mysql_query(“ROOLBACK”);\/\/\u5224\u65ad\u6267\u884c\u5931\u8d25\u56de\u6eda
}
mysql_query(“COMMIT”);\/\/\u6267\u884c\u4e8b\u52a1
mysql_close($handler);
?><\/p>\n