Question

我在查询上遇到了一个奇怪的问题，我只是使用2个日期进行搜索，我将数据库中的所有日期格式化为2012-12-02 00:00:00 mysql格式，但它只是简单忽略AND cslblicstat ='10'和wcxdate BETWEEN'$ date1'和'$ date2'并给我任何具有匹配类的东西。

$user = $session->username;
if(isset($_POST['carrier'])){
$carrier = $_POST['carrier'];
$class[] = $_POST['class'][0];
$date1 = $_POST['date1'];
$date1 = date("Y-m-d 00:01", strtotime($date1));
$date2 = $_POST['date2'];
$date2 = date("Y-m-d 59:59", strtotime($date2));

 foreach( $class as $key){
 $query =   "SELECT * FROM leads WHERE class1 = '$key' OR class2 = '$key' OR class3 = '$key' OR class4 = '$key' OR class5 = '$key' OR class6 = '$key' OR class7 = '$key' OR class8 = '$key' OR class9 = '$key' OR class10 = '$key' OR class11 = '$key' OR class12 = '$key' AND user = '' AND wccompcode = '$carrier' AND cslblicstat = '10' AND wcxdate BETWEEN '$date1' AND '$date2' LIMIT 100";
$sellead = mysql_query($query)or die(mysql_error());
while($leads = mysql_fetch_array($sellead)){

    $arrayl[] = $leads;
    $rowid = $leads['ID'];
    $update = mysql_query("UPDATE leads SET user = '$user' WHERE ID = '$rowid'")or die(mysql_error());

}
}
}

Answer 1

在SQL中，AND运算符的优先级高于OR。我想你只需要将ORed条件放入括号中：

SELECT * 
FROM leads
WHERE (class1 = '$key' OR class2 = '$key' OR ... OR class12 = '$key')
  AND user = '' 
  AND wccompcode = '$carrier' 
  AND cslblicstat = '10' 
  AND wcxdate BETWEEN '$date1' 
                  AND '$date2' 
LIMIT 100

如果对操作符的优先级有疑问，请使用括号（或参考手册）。

你也可以用IN：

写出这个条件

WHERE '$key' IN (class1, class2, ... , class12)
  AND user = ''
  ---

Answer 2

在MySQL中，在OR之前进行评估。所以你的WHERE子句等同于：

SELECT 1 OR 0 AND 0;

结果是真的：

+--------------+
| 1 OR 0 AND 0 |
+--------------+
|            1 |
+--------------+

另外，表达OR条件的语法更简单的方法是这样的：

WHERE '$key' IN ( class, class2, class3, ... ) AND ... ;

但是，只要你有像数字这样的列，它的真正含义就是你的架构可以改进。

MySQL在2个日期之间搜索

2 个答案: