Laravel orderBy 列值错误

Question

我正在尝试按列值对结果进行排序，但它不起作用

$users = Comment::select([
            'id',
            'comment',
            'user_name',
            'product_id',
            'rating',
            'country',
            'status',
            'pin',
            'created_at',
        ])->where('shop_name',$shop)->where('product_id', $id)->with('images')->orderByRaw("IF(product_url = 'customer')  DESC")->orderByRaw("product_url = manually ASC")->orderBy('pin', 'desc')->orderBy('rating', 'desc')->with('pages')->get();

我添加了这段代码

->orderByRaw("IF(product_url = 'customer')  DESC")

我收到这个错误

"SQLSTATE[42000]: Syntax error or access violation: 1064 You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ') DESC, product_url = manually ASC, pin desc, rating desc' at line 1 (SQL: select id, comment, user_name, product_id, rating, country, status, pin, created_at from comments where shop_name = and product_id = order by IF(product_url = 'customer') DESC, product_url = manually ASC, pin desc, rating desc)

Answer 1

MySQL IF 函数接受三个个参数。

这个表达式无效：

  IF(product_url = 'customer')

因为只有一个参数提供给 IF() 函数。

我们可以这样做：

  IF(product_url = 'customer',1,0)

相当于更符合 ANSI 标准

  CASE WHEN product_url = 'customer' THEN 1 ELSE 0 END

MySQL shorthand 也可以

  ORDER BY product_url = 'customer'   DESC

相当于

  ORDER BY CASE
           WHEN product_url = 'customer' THEN 1 
           WHEN product_url IS NOT NULL  THEN 0
           ELSE NULL
           END   DESC

Laravel orderBy 列值错误

Laravel orderBy with column value error

php

mysql

sql

laravel

laravel-5.5