php批量修改表結構

 1 <?php
 2 set_time_limit(0);
 3 $con = mysql_connect("localhost", "root", "root");
 4 $dbname = "db";
 5 if ($con) {
 6   if (mysql_select_db($dbname, $con)) {
 7     $sql = "show tables like 'pre_tb_%'";
 8     $ret = mysql_query($sql);
 9     while($row = mysql_fetch_assoc($ret)){
10       $info1[] = $row;
11     }
12     foreach ($info1 as $v) {
13       $chidarr1[] = substr($v['Tables_in_multiopen (pre_tb_%)'],7);//獲取標記號
14     }
15     foreach ($chidarr1 as $val) {
16       $tabname = 'stat_adclick_'.$val;
17       $sql = "alter table $tabname add column c2 int default 0 after p";
18       mysql_query($sql);
19       $sql = "alter table $tabname DROP PRIMARY KEY";
20       mysql_query($sql);
21       $sql = "alter table $tabname add primary key(c2,p)";
22       mysql_query($sql);
23       $sql = "alter table $tabname drop index old_index";
24       mysql_query($sql);
25       $sql = "create index idx_newincex on $tabname (c2,p)";
26       mysql_query($sql);
27     }
28   }
29 }
30 mysql_close($con);
31 ?>