如何在Laravel Join语句中“ SET SQL_BIG_SELECTS = 1”

Question

当我尝试执行6个联接的数据库查询时，出现以下错误消息：

SQLSTATE[42000]: Syntax error or access violation: 1104 The SELECT would examine more than MAX_JOIN_SIZE rows; check your WHERE and use SET SQL_BIG_SELECTS=1 or SET MAX_JOIN_SIZE=# if the SELECT is okay

 $results = DB::table('table_1')
->join('table_2', 'table_1.id', '=', 'table_2.id')

...

我的问题是： 如何在Laravel查询中设置“ SET SQL_BIG_SELECTS = 1”？

Answer 1

我找到了解决方案:)

在app / config / database.php中

更改以下内容：

'mysql' => [
        'driver'    => 'mysql',
        'host'      => env('DB_HOST', 'localhost'),
        'database'  => env('DB_DATABASE', 'forge'),
        'username'  => env('DB_USERNAME', 'forge'),
        'password'  => env('DB_PASSWORD', ''),
        'charset'   => 'utf8',
        'collation' => 'utf8_unicode_ci',
        'prefix'    => '',
        'strict'    => false,
    ],

至：

'mysql' => [
        'driver'    => 'mysql',
        'host'      => env('DB_HOST', 'localhost'),
        'database'  => env('DB_DATABASE', 'forge'),
        'username'  => env('DB_USERNAME', 'forge'),
        'password'  => env('DB_PASSWORD', ''),
        'charset'   => 'utf8',
        'collation' => 'utf8_unicode_ci',
        'prefix'    => '',
        'options'   => array(
            PDO::MYSQL_ATTR_INIT_COMMAND => 'SET SESSION SQL_BIG_SELECTS=1',
        ),
        'strict'    => false,
    ],

我添加了“选项”数组并定义了SQL_BIG_SELECTS

如此，我们可以根据需要配置PDO！

希望这对其他人有用;）