Laravel : Syntax error or access violation: 1055 Error

[yehlu]

https://segmentfault.com/a/1190000008383053

public function uploads($count)
{
$items = \DB::table('article')
->select('pcode.name', \DB::raw('count(*) as upload_count'))
->leftJoin('pcode', 'article.organization_id', '=', 'pcode.id')
->where([
['pcode.type', '=', "organization_type"],
['article.status', '=', 1]
])
->groupBy('organization_id');
return $items->paginate($count);
}
上面这样一段代码, 测试服务器很好, 上线后报错了.
Syntax error or access violation: 1055 Error : MySQL : isn't in GROUP BY
云云

后来Google了一下说是sql_mode设置导致的问题, 修改 config/database.php这个配置 strict => false

'mysql' => [
'driver' => 'mysql',
'host' => env('DB_HOST', 'localhost'),
'port' => env('DB_PORT', '3306'),
'database' => env('DB_DATABASE', 'forge'),
'username' => env('DB_USERNAME', 'forge'),
'password' => env('DB_PASSWORD', ''),
'charset' => 'utf8',
'collation' => 'utf8_unicode_ci',
'prefix' => '',
'strict' => false,
'engine' => null,
],
然后试了一下 果然问题解决了 ,然后仔细查阅了一下原因:

查询mysql 1055错误码发现问题为在mysql的配置中如果设置了sql_mode包含
ONLY_FULL_GROUP_BY值得话，在进行查询时需要将select的字段都包含在group by 中。
即 select x,y from xxx group by x,y
否则就会报错

总结:

laravel 5.3 是默认开启 mysql严格模式的.
mysql在严格模式下, 并且开启了ONLY_FULL_GROUP_BY的情况下,
group by 的字段没有出现在 select 的语句中会报错.关闭了严格模式就不会报错.