php批量修改表结构实例

废话不多说，直接上代码

    <?php
    set_time_limit(0);
    $con = mysql_connect("localhost", "root", "root");
    $dbname = "db";
    if ($con) {
     if (mysql_select_db($dbname, $con)) {
      $sql = "show tables like 'pre_tb_%'";
      $ret = mysql_query($sql);
      while($row = mysql_fetch_assoc($ret)){
       $info1[] = $row;
      }
      foreach ($info1 as $v) {
       $chidarr1[] = substr($v['Tables_in_multiopen (pre_tb_%)'],7);//获取标记号
      }
      foreach ($chidarr1 as $val) {
       $tabname = 'stat_adclick_'.$val;
       $sql = "alter table $tabname add column c2 int default 0 after p";
       mysql_query($sql);
       $sql = "alter table $tabname DROP PRIMARY KEY";
       mysql_query($sql);
       $sql = "alter table $tabname add primary key(c2,p)";
       mysql_query($sql);
       $sql = "alter table $tabname drop index old_index";
       mysql_query($sql);
       $sql = "create index idx_newincex on $tabname (c2,p)";
       mysql_query($sql);
      }
     }
    }
    mysql_close($con);
    ?>

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