绑定参数到 Db::raw laravel 查询

Posted 2023-02-23

【中文标题】绑定参数到 Db::raw laravel 查询

【英文标题】：Binding parameter to Db::raw laravel query

【发布时间】：2017-06-14 07:34:30

【问题描述】：

我有以下原始查询：

$results = Db::select( Db::raw("SELECT HOUR(created_at) as hour, COUNT(*) as count
                       FROM `visited`
                       WHERE created_at >= DATE_SUB(NOW(),INTERVAL 16 DAY)
                       GROUP BY HOUR(created_at)") );

我需要参数化天间隔，所以我尝试了这个：

$days = 16;
$results = Db::select( Db::raw("SELECT HOUR(created_at) as hour, COUNT(*) as count
                       FROM `visited`
                       WHERE created_at >= DATE_SUB(NOW(),INTERVAL :days DAY)
                       GROUP BY HOUR(created_at)", ["days" => $days]) );

但我收到以下错误：

“SQLSTATE[HY000]：一般错误：2031

显然绑定不起作用。我做错了什么？

【参考方案1】：

试试这个：

$results = DB::select('SELECT HOUR(created_at) as hour, COUNT(*) as count FROM visited WHERE created_at >= DATE_SUB(NOW(),INTERVAL ? DAY) GROUP BY HOUR(created_at)', [16]);

您甚至可以使用命名绑定：

$results = DB::select('SELECT HOUR(created_at) as hour, COUNT(*) as count FROM visited WHERE created_at >= DATE_SUB(NOW(),INTERVAL :days DAY) GROUP BY HOUR(created_at)', ['days' => 16]);

不需要使用DB::raw()，只需使用DB::select() 进行简单的原始选择查询：https://laravel.com/docs/master/database#running-queries