不要在循環中對數據庫進行操作

不要在循環中對數據庫進行操作

性能非常低下，應改為用IN查詢

示例：

1、在循環中查詢數據庫，增加gv_title屬性(性能低下)

foreach ($res['data'] as &$val)

{

$gamesql??? =?? 'SELECT `gv_title` FROM

`mzw_game_version` WHERE `gv_id` =

'.$val['gv_id'];

$gamequery? =?? $this->db->query( $gamesql

);

$val['gv_title']??????? =?? isset(

$gamequery->row()->gv_title ) ? $gamequery->row()->gv_title :

'';

$val['select_name_cf']????????? =

'';

$val['do_name_cf']?????????????

=

'';

$val['iTotalRecords']??????????

=

$res['total'];

$val['iTotalDisplayRecords']??? =

$res['total'];

$val['gc_client']??????????????

=

$arr_client[$val['gc_client']];

$val['gc_hide']????????????????

=

$arr_hide[$val['gc_is_hide']];

$val['gc_top']?????????????????

=

$arr_top[$val['gc_is_top']];

$val['gc_top_time']????????????

= date( 'Y-m-d H:i:s', $val['gc_top_time']

);

$val['gc_create_time']????????? =

date( 'Y-m-d H:i:s', $val['gc_create_time']

);

}

2、改用 IN 查詢，速度提高至少10倍

foreach ($res['data'] as &$val)

{

$vid[]?????????????????????????

= $val['gv_id'];

color=#ff0000>//將gv_id存入到數組

$val['select_name_cf']????????? =

'';

$val['do_name_cf']?????????????

=

'';

$val['iTotalRecords']??????????

=

$res['total'];

$val['iTotalDisplayRecords']??? =

$res['total'];

$val['gc_client']??????????????

=

$arr_client[$val['gc_client']];

$val['gc_hide']????????????????

=

$arr_hide[$val['gc_is_hide']];

$val['gc_top']?????????????????

=

$arr_top[$val['gc_is_top']];

$val['gc_top_time']????????????

= date( 'Y-m-d H:i:s', $val['gc_top_time']

);

$val['gc_create_time']????????? =

date( 'Y-m-d H:i:s', $val['gc_create_time']

);

}

if ( empty( $vid ) )??? $vid =

array(0);

$vid_str??? =?? implode( ',', $vid

);

$sql??????? =?? "SELECT

gv_title,gv_id FROM mzw_game_version WHERE gv_id IN ({$vid_str})";

color=#ff0000>//用IN方法對id數組進行查詢

$query????? =?? $this->db->query( $sql

);

$title_res? =??

$query->result_array();

$title_arr? =??

array();

foreach ($title_res as $k => $v)

{

$title_arr[$v['gv_id']] =??

$v['gv_title'];

}

foreach ($res['data'] as &$val)

{

$val['gv_title']??? =??

$title_arr[$val['gv_id']];

}

一鍵復制

編輯

Web IDE

原始數據

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歷史

總結

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