根据用户级别 CASE v. IF 过滤结果

Question

Okay I am having an issue with this.好的，我对此有疑问。

I have 2 different tables that I am trying use to restrict access to records.我有 2 个不同的表，我试图用它们来限制对记录的访问。

Users are based on 4 levels.用户基于 4 个级别。 lvl 1 being the highest and lvl 4 being the lowest. 1级最高，4级最低。

The users table has 7 fields.用户表有 7 个字段。 The other table also has the fields below indicated by {train_...}另一个表也有下面由 {train_...} 指示的字段

userID (AI) Int用户 ID (AI) Int
** UserLogin varchar ** 用户登录 varchar
UserPass Password用户密码
UserEmail email varchar UserEmail 电子邮件 varchar
UserActive Y/N int UserActive Y/N int
** UserAgency varchar ** UserAgency varchar
** UserComp varchar ** UserComp varchar
** UserMSC varchar ** 用户MSC varchar
** UserSubMSC int ** UserSubMSC int
** UserLevel int ** 用户级别 int
** indicates these are set to variables once the user signs in. ** 表示这些在用户登录后设置为变量。

In my php code I have tried IF statements, and In my SQL I have tried CASE statements.在我的 php 代码中，我尝试了 IF 语句，而在我的 SQL 中，我尝试了 CASE 语句。

I cannot get the IF statement to function, as I keep getting a syntax error.我无法使 IF 语句起作用，因为我不断收到语法错误。 Parse Error: unexpected } on line ....解析错误：意外的} 在线....

The CASE statement works for the SQL, however, it causes issues with dynamic searches once the form is loaded. CASE 语句适用于 SQL，但是，一旦加载表单，它就会导致动态搜索出现问题。

The If Statment If 语句
[] are global variables and {} indicate field names. [] 是全局变量，{} 表示字段名称。

if ('[usr_level]' == 1) 
{ 
    '{train_agencyID}' == '[agencyID]'
}
elseif ('[usr_level]' == 2)
{ 
    '{train_componentID}' == '[componentID]'
}
elseif ('[usr_level]' == 3)
{ 
    '{train_UnitMSC}' == '[mscID]'
}
elseif ('[usr_level]' == 4)
{ 
    '{train_Unit_Comp}' == '[submscID]'
};

The CASE Statement案例声明

WHERE '[usr_level]'
  CASE WHEN '[usr_level]' = 1 THEN 
    train_agencyID = '[agencyID]' 
  END
  OR
  CASE WHEN '[usr_level]' = 2 THEN
    train_componentID = '[componentID]' 
  END
  OR
  CASE WHEN '[usr_level]' = 3 THEN
    train_UnitMSC = '[mscID]'
  END
  OR
  CASE WHEN '[usr_level]' = 4 THEN
    train_Unit_Comp = '[submscID]'
  END

I've been racking my brain for 3 days now and I'm missing something simple but for the life of my I cannot figure this out.我已经绞尽脑汁 3 天了，我错过了一些简单的东西，但在我的一生中，我无法弄清楚这一点。

Answer 1

I think this may work for you, here is a basic switch statement with php.我认为这可能对你有用，这是一个带有 php 的基本 switch 语句。

<!DOCTYPE html>
<html lang="en" dir="ltr">
  <head>
    <meta charset="utf-8">
    <title></title>
  </head>
  <body>
    <form  method="post">
    <input type="text" name="user_level"  />
    <input type="submit" value="submit" />
    </form>
  </body>
</html>

<?php


$user_level = filter_input(INPUT_POST, 'user_level');

switch($user_level) {
    case '1':
       $train_agencyID = 'agencyID';
        break;
    case '2':
        $train_componentID = 'componentID';
        break;
    case '3':
         $train_UnitMSC = 'mscID';
    case '4':
         $train_Unit_Comp = 'submscID';
         break;
         default:
         $error = "Invalid selection.";
    }

  if(isset($train_agencyID)) {
    echo $train_agencyID;
  }
  elseif(isset($train_componentID)) {
    echo $train_componentID;
  }
  elseif(isset($train_UnitMSC)) {
    echo $train_UnitMSC;
  }
  elseif(isset($train_Unit_Comp)) {
    echo $train_Unit_Comp;
  }
 ?>

I added more code so you can test this and see the output for yourself.我添加了更多代码，以便您可以对此进行测试并亲自查看输出。

根据用户级别 CASE v. IF 过滤结果

问题描述

1 个解决方案

解决方案1
0 2018-08-21 02:14:31

根据用户级别 CASE v. IF 过滤结果

问题描述

1 个解决方案

解决方案1 0 2018-08-21 02:14:31

解决方案1
0 2018-08-21 02:14:31