MySQL 存储过程参数验证

Question

我想知道将验证错误从 MySQL 存储过程返回到 PHP 应用程序的最佳做法是什么。我已经看到Signals 和字符串都在使用，但我正在寻找一种自动处理错误的方法，以便将它们映射到表单字段。

例如，如果我有一个注册表单，我需要确保系统中不存在该电子邮件。所以我需要存储过程来返回一个 key => value ex。 "email" => "Duplicate entry for email"

我还认为将消息（将发送到客户端）存储在数据库中可能没有意义。离开上面的电子邮件示例，"email" => "1062"，然后在 PHP 应用程序中，有一个地图，1062 => "$key already exists."

我很高兴能够保持键 =>（值/错误消息）关联，以便 AJAX 响应对象可以包含类似的东西

// Http Status 400
{ "email": "Email already exists", "name": "Name is required" }

这样email和name的key就直接和他们输入的“name”和“email”相关联了。

<form>
  <input name="name"/>
  <input name="email"/>
  <input type="submit" value="Submit"/>
</form>


<?php
  $sanitizedInput = $_POST; //Pretend this data is actually sanitized.
  $pdo = new PDO($dsn, $username, $password);
  $stmt = $pdo->prepare("CALL registerUser(?, ?)");
  $stmt->bindParam(1, $sanitizedInput["name"]);
  $stmt->bindParam(2, $sanitizedInput["email"]);

  #Whats the best method for processing?
  try{
      if($stmt->execute()){

      }else{

      }
  }catch(PDOException $e){
     //I want to prevent doing string comparisons if possible
     //Signal example
     //It seems like this step could be automated and reused.
     //For example, if we allow a user to update their email address,
     //we could have the string 'Duplicate entry for email' in the
     //codebase twice, and it seems like the process could be easily broken.
     if($stmt->errorInfo[2] == 'Duplicate entry for email'){
        return array('email' => 'Email already exists');
     }
  }
?>

#SQL
signal sqlstate = '45000' set message_text = 'Duplicate entry for email'

 create procedure registerUser(
   name varchar(50),
   email varchar(50)
 )
 begin
 declare emailExists int(0);

 select count(*) into emailExists from users where email = email;

 if emailExists = 0 then
     insert into users values(default, name, email);
 else
     //Return {email: 'Duplicate entry for email'}
 end

结束

Answer 1

为什么要在存储过程中运行验证？为什么不先使用 php 来验证格式。然后第二个检查将是这个查询

SELECT 1 FROM emails where email = 'abc@nb.com' LIMIT 1

如果这个查询返回 1 表示记录存在？

如果你想使用存储过程，这在此处是一种过度杀戮。

您可以使用SQLEXCEPTION HANDLER

类似的东西

DECLARE CONTINUE HANDLER FOR SQLEXCEPTION
    BEGIN
        GET DIAGNOSTICS CONDITION 1
        @err_sqlstate = RETURNED_SQLSTATE,
        @err_message = MESSAGE_TEXT,
        @err_num = MYSQL_ERRNO;

        SET @hasError = TRUE;
    END;

运行查询后，您可以执行以下操作

IF(@hasError)

 SELECT CONCAT("[",
      GROUP_CONCAT(
           CONCAT("{message:'", @err_message,"'"),
           CONCAT(",sqlState:'",@err_sqlstate),"'}")
      )
 ,"]") AS jSON
END IF;