Question

在表单中，用户需要检查将收到简报的选项，例如：

<input type="checkbox" name="male"  value="1" />
<input type="checkbox" name="female"  value="1" />
<input type="checkbox" name="person" value="1" />
<input type="checkbox" name="company" value="1" />

但我有问题如何使用选中的选项

为db创建查询

到目前为止，我有这个代码，但它并不好，因为时事通讯必须一直是1，之后我有OR，因为当我把AND而不能得到我需要的结果时：

if($options['male']) {
            $sqlAddMale = " OR gender = 2 ";
        }
        if($options['female']) {
            $sqlAddFemale = " OR gender = 1 ";
        }
        if($options['person']) {
            $sqlAddPerson = " OR VAT = '' ";
        }
        if($options['company']) {
            $sqlAddCompany = " OR VAT <> '' ";
        }

        $query = "
            SELECT email FROM users WHERE newsletter=1
            ".$sqlAddMale."
            ".$sqlAddFemale."
            ".$sqlAddPerson."
            ".$sqlAddCompany."          
            ";

Answer 1

我想你需要这样的东西：

$placeOr = false;
if($options['male']) {
    $placeOr = true;
    $sqlAddMale = " (newsletter=1 AND gender = 2) ";
}
if($options['female']) {
    $sqlAddFemale = (($placeOr)?" Or ":"");
    $sqlAddFemale .= " (newsletter=1 AND gender = 1) ";
    $placeOr = true;
}
if($options['person']) {
    $sqlAddPerson = (($placeOr)?" Or ":"");
    $sqlAddPerson .= " (newsletter=1 AND VAT = '') ";
    $placeOr = true;
}
if($options['company']) {
    $sqlAddCompany = (($placeOr)?" Or ":"");
    $sqlAddCompany .= " (newsletter=1 AND VAT <> '') ";
    $placeOr = true;
}

$query = "
    SELECT email FROM users WHERE 
    ".$sqlAddMale."
    ".$sqlAddFemale."
    ".$sqlAddPerson."
    ".$sqlAddCompany."          
    ";

Answer 2

以下是如何解决问题，使用一个变量构建where子句，在添加第一个条件时使用AND operater，否则使用OR

$sqlString = '';
if($options['male']) {
         $sqlString = " AND gender = 2 ";
    }
    if($options['female']) {
        if(!$sqlString) $sqlString = " AND gender = 1 ";
        else
            $sqlString .= " OR gender = 1 ";
    }
    if($options['person']) {
        if(!$sqlString) $sqlString = " AND VAT = '' ";
        else
            $sqlString .= " OR VAT = '' ";
    }
    if($options['company']) {
        if(!$sqlString) $sqlString = " AND VAT <> '' ";
        else 
           $sqlString .= " OR VAT <> '' ";
    }

    $query = "SELECT email FROM users WHERE newsletter=1'".$sqlString."'";

选择多个条件

2 个答案: