在mysql查询中使用多个WHERE条件

时间:2012-08-31 23:51:43

标签: php mysql

我正在尝试将多个WHERE条件应用于我的查询,如下所示:

$hotel="Hotel Name";
$data1=explode('/',$data1);
$newdata1=mktime(0, 0, 0, $data1[0], $data1[1], $data1[2]);
$newdata1=date("Y-m-d", $newdata1);

$data2=explode('/',$data2);
$newdata2=mktime(0, 0, 0, $data2[0], $data2[1], $data2[2]);
$newdata2=date("Y-m-d", $newdata2);

$filtro=mysql_query("SELECT * 
                    FROM hotels_rates_flat
                    WHERE htl_name = $hotel AND  
                          given_date>=$newdata1 AND 
                          given_date<=$newdata2 
                    ORDER BY htl_name, city_zone, given_date") 
             or die(mysql_error());

它返回以下错误:

* 您的SQL语法出错;查看与您的MySQL服务器版本对应的手册,以便在'do Hotel AND given_date&gt; = 2012-09-01 AND given_date&lt; = 2012-09-05 ORDER BY htl_nam'第1行附近使用正确的语法。*

这真让我烦心,因为我看不出任何明显的错误。

我将不胜感激。

谢谢

3 个答案:

答案 0 :(得分:2)

使用PDO来避免SQL注入和错误报告:

<?php
    $db = new PDO('mysql:host=localhost;dbname=testdb;charset=UTF-8', 'username', 'password', array(PDO::ATTR_EMULATE_PREPARES => false, PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION));
    $hotel="Hotel Name";                                                                                    
    $data1=explode('/',$data1);
    $newdata1=mktime(0, 0, 0, $data1[0], $data1[1], $data1[2]);
    $newdata1=date("Y-m-d", $newdata1);

    $data2=explode('/',$data2);
    $newdata2=mktime(0, 0, 0, $data2[0], $data2[1], $data2[2]);
    $newdata2=date("Y-m-d", $newdata2);

    try {
        $stmt = $db->query("SELECT * FROM `hotels_rates_flat` WHERE `htl_name` = :hotel AND (`given_date` BETWEEN :date1 AND :date2) ORDER BY `htl_name`, `city_zone`, `given_date`");
        $stmt->execute(array(':hotel' => $hotel,':date1' => $newdata1,':date2' => $newdata2));
        $results = $stmt->fetchAll(PDO::FETCH_ASSOC);
    } catch(PDOException $ex) {
        echo $ex->getMessage();
    }
    // use $results
?>

答案 1 :(得分:1)

问题的根源是引用。您应该使用带有占位符的预准备语句,并让mysql驱动程序弄清楚如何以语法上有效的方式插入值。

您可以使用与mysqli_类似的mysql_函数,只需添加一些额外的调用来处理参数。你确实需要一个显式的数据库句柄(我在下面称它为$dbh;它是从mysqli_connect()返回的),而不是像mysql_函数那样依赖于隐式的句柄。

$stmt = mysqli_prepare($dbh, 'SELECT * FROM hotels_rates_flat' 
                           . ' WHERE htl_name = ?'
                           .   ' AND given_date BETWEEN ? AND ?'
                           . ' ORDER BY htl_name, city_zone, given_date');

# the 'sss' means treat all three parameters as (s)trings
mysqli_bind_param($stmt, 'sss', $hotel, $newdata1, $newdata2) or die(mysqli_error($dbh));

$filtro = mysqli_stmt_execute($stmt) or die(mysqli_error($dbh));

或者你可以使用PDO,就像Mihai的回答一样,这有点不同。

答案 2 :(得分:-2)

您需要用单引号包围$hotel$newdata1$newdata2

SELECT * FROM hotels_rates_flat WHERE htl_name = '$hotel' AND ...

您也可以使用BETWEEN运算符,而不是写出小于&amp;大于:

AND given_date BETWEEN '$newdata1' AND '$newdata2'

您还应该stop using mysql_个函数。