如何在laravel中捕获查询异常以查看其是否失败? [英] How do I catch a query exception in laravel to see if it fails?

问题描述

我要做的就是验证查询.

All I'm trying to do is verify a query.

'SELECT * from table_that_does_not_exist'

在没有错误的情况下，我想知道它失败了，所以我可以返回一个指出错误:表不存在"或一般错误的响应.

Without that erroring out, I'd like to know it failed so I can return a response that states "Error: table does not exist" or the generic error.

推荐答案

捕获任何sql语法或查询错误的最简单方法是在为查询提供闭包后捕获Illuminate\Database\QueryException:

The simplest way to catch any sql syntax or query errors is to catch an Illuminate\Database\QueryException after providing closure to your query:

try { 
  $results = \DB::connection("example")
    ->select(\DB::raw("SELECT * FROM unknown_table"))
    ->first(); 
    // Closures include ->first(), ->get(), ->pluck(), etc.
} catch(\Illuminate\Database\QueryException $ex){ 
  dd($ex->getMessage()); 
  // Note any method of class PDOException can be called on $ex.
}

如果有任何错误，程序将根据需要die(var_dump(...)).

If there are any errors, the program will die(var_dump(...)) whatever it needs to.

注意:对于命名空间，如果该类未包含在use语句中，则需要先\.

Note: For namespacing, you need to first \ if the class is not included as a use statement.

也可供参考: Laravel 5.1 API-查询异常

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