Question

我正在尝试使用php构建一个sql查询，其中每个GET变量（如果设置）都会附加到查询中。例如：

$dbQuery = "SELECT * FROM orders WHERE deleted = 0 AND ({$dueQ} {$paidQ} {$completedQ} {etc. etc. etc.}) ";

每个参数的创建方式如下：

$due = $_GET['due'];
if (isset($due)) {
    $dueQ = " AND due = '0'";
}

所以我检查是否设置了每个get参数，如果是，则将该字符串添加到查询中。

我的问题是...... 如何创建查询，使第一个参数不以＆＃34; AND＆＃34;？开头？由于我不知道哪个是要添加到查询中的第一个参数，因此我无法找到一种方法来解释它不是以＆＃34; AND＆＃34;开头。现在查询读取＆＃34; AND 到期=＆＃39; 0＆＃39;与...＆＃34 ;.有意义吗？

Answer 1

您可以将参数添加到数组中，然后implode()将AND作为粘合剂添加：

$params = array();
if (isset($_GET['due']))
    $params[] = "due = '0'";

if (isset($_GET['paid']))
    $params[] = "paid = '0'";

...etc...

$dbQuery = "SELECT ... WHERE deleted = 0 AND ".implode(' AND ', $params);
//SELECT ... WHERE deleted = 0 AND due = '0' AND paid = '0'

Answer 2

使用布尔变量检查条件是否已经满足，并根据布尔变量的状态，逐步构造查询，如下所示：

$dbQuery = "SELECT * FROM orders WHERE deleted = 0";

$flag = false;

$due = $_GET['due'];
if(isset($dueQ)){
    $dbQuery .= " AND due = '0'"; 
    $flag = true;
}

if(isset($paidQ)){
    if($flag){
        $dbQuery .= " something = 'something'";
    }else{
        $dbQuery .= " AND somethingElse = 'somethingElse'";
        $flag = true;
    } 
}

if(isset($completedQ)){
    if($flag){
        $dbQuery .= " something = 'something'";
    }else{
        $dbQuery .= " AND somethingElse = 'somethingElse'";
        $flag = true;
    } 
}

// etc.

使用PHP参数构建mySQL查询 - ＆＃34;首先AND＆＃34;

2 个答案: