【下载文档:  php批量修改表结构实例.txt 】

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php批量修改表结构实例
废话不多说，直接上代码
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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