本項目中關聯了2個數據庫
'default' => env('DB_CONNECTION', 'mysql'), //默認使用mysql為連接庫
'connections' => [
'mysql' => [
'driver' => 'mysql',
'host' => '192.168.0.xx',
'database' => 'database',
'username' => 'root',
'password' => '',
'charset' => 'utf8',
'collation' => 'utf8_unicode_ci',
'prefix' => 'tb_',
'strict' => false,
],
'mysql_snapshot' => [
'driver' => 'mysql',
'host' => env('DB_HOST_SNAPSHOT', '192.168.0.xx'),
'database' => env('DB_DATABASE_SNAPSHOT', 'snapshot'),
'username' => env('DB_USERNAME_SNAPSHOT', 'root'),
'password' => env('DB_PASSWORD_SNAPSHOT', ''),
'charset' => 'utf8',
'collation' => 'utf8_unicode_ci',
'prefix' => 'tb_',
'strict' => false,
],
],
在某個需求中，需要使用子查詢獲取snapshot快照表庫的關聯數據，從而實現以下sql邏輯
SELECT ... From
(SELECT
sum(game_count) AS sum_count,
max(game_count) AS max_count,
game_room_id,
record_date
FROM
`tb_xx_snapshot`
WHERE
record_date BETWEEN '2017-05-17' AND '2017-05-23'
AND
type = '1'
GROUP BY
game_room_id) as main
INNER JOIN `tb_xx_snapshot` AS `tb_gg` ON tb_gg.game_count = main.max_count and tb_gg.game_room_id = main.game_room_id
where
tb_gg.record_date BETWEEN '2017-05-17' AND '2017-05-23'
AND
tb_gg.type = '1'
GROUP BY
tb_gg.game_room_id;
其中子查詢主要用到以下query builder語句
$query = DB::table('xx_snapshot')->where('xx','yy')->groupBy('xx');
$main = DB::connection('mysql_snapshot')
->table(DB::raw("({$query->toSql()}) as tb_main"))
->mergeBindings($query->getQuery()) // 綁定參數，否則sql語句會只有'?'
->get();
而join語句中可傳入匿名函數重新構造，如再其中加多幾個連接條件，或者查詢條件
$con = DB::table('xx_snapshot')
->join('xx_snapshot as gg', function ($query) {
$query->on('gg.game_count', '=', 'xx_snapshot.max_count')
->on('gg.game_room_id', '=', 'xx_snapshot.game_room_id')
->where('gg.xx','123';
})
實現上述需求完整代碼如下：
$subQuery= GameroomModel::select(DB::raw('sum(game_count) as sum_count,max(game_count) as max_count,record_date,game_room_id'))
->whereBetween('record_date',[$beginDay,$endDay])
->where('type','1')
->groupBy('game_room_id');
$main = DB::connection('mysql_snapshot')
->table(DB::raw("({$subQuery->toSql()}) as tb_main"))
->mergeBindings($playerGame->getQuery())
->join('gameroom_snapshot as gg', function ($join) {
$join->on('gg.game_count', '=', 'main.max_count')
->on('gg.game_room_id', '=', 'main.game_room_id');
})
- >select('main.max_count','main.sum_count','gg.record_date','main.game_room_id')
->whereBetween('gg.record_date',[$beginDay,$endDay])
->groupBy('main.game_room_id')
->get();
代碼中子查詢和外層都group by了一次，應該可以再優化一下.
以上這篇關于laravel 子查詢 join的使用就是小編分享給大家的全部內容了，希望能給大家一個參考，也希望大家多多支持腳本之家。
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