php - 多个搜索查询的一个搜索框

Question

所以我有一个搜索框，可以搜索输入的任何内容（手机品牌、型号、操作系统和降价），并有一个循环根据是否满足搜索条件，在自己的框中显示每个结果。但是，当我添加多个查询时，其中两个有效，其余无效。代码如下：

mysql_select_db("bg29li", $con);
$phonesearch = $_POST['phonesearch'];

$sql = "SELECT * FROM `phones` JOIN manufacturer USING (ManufacturerID) JOIN operatingsystem USING (OSID) WHERE Price <='$phonesearch' ORDER BY `Price` DESC";
$sql = "SELECT * FROM `phones` JOIN manufacturer USING (ManufacturerID) JOIN operatingsystem USING (OSID) WHERE Model LIKE '%$phonesearch%'";
$sql = "SELECT * FROM `phones` JOIN manufacturer USING (ManufacturerID) JOIN operatingsystem USING (OSID) WHERE OSName LIKE '%$phonesearch%'";
$sql = "SELECT * FROM `phones` JOIN manufacturer USING (ManufacturerID) JOIN operatingsystem USING (OSID) WHERE Name LIKE '%$phonesearch%'";

$result = mysql_query($sql);

echo "<h2>Search Results:</h2>";
while($row = mysql_fetch_array($result))
{ ?>

在此示例中，似乎只有底部查询有效（获取与输入的品牌名称相同的手机）。我想知道是否有人可以帮我解决这个问题？

谢谢。

Answer 1

您正在覆盖变量$sql。将其减少为一个查询，如下所示：

SELECT *
FROM `phones`
JOIN manufacturer USING (ManufacturerID)
JOIN operatingsystem USING (OSID)
WHERE (Price <='$phonesearch')
  OR (Model LIKE '%$phonesearch%')
  OR (OSName LIKE '%$phonesearch%')
  OR (Name LIKE '%$phonesearch%')
ORDER BY `Price` DESC