php批量修改表结构实例_PHP教程

php批量修改表结构实例

2021-05-21 16:06jingxian PHP教程

下面小编就为大家带来一篇php批量修改表结构实例。小编觉得挺不错的，现在就分享给大家，也给大家做个参考。一起跟随小编过来看看吧

废话不多说，直接上代码

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									<?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);

									?>