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 ); ?> |