查询PHP/MySql和/或高级搜索

Question

我是php和mysql的新手,所以我需要一些查询帮助.这是我的SQL查询

SELECT * FROM table1 WHERE (Name LIKE '%$keyword%' OR ZipCode LIKE '%$keyword%') AND Category LIKE '$category' AND Country LIKE '$country' LIMIT $start, $limit

现在我想做的事情就是

1. 此查询应使用带有name关键字的文本字段在Name或ZipCode中搜索列名.这是关键字匹配Name列或ZipCode.
2. 如果未输入关键字且仅从下拉列表中选择国家/地区,则查询也应有效.
3. 如果没有输入关键字或国家/地区,并且只从下拉列表中选择了某个类别,则查询也应该有效.

换句话说,如果选择了关键字,国家或类别中的任何一个,则搜索应相应地显示结果.此外,如果输入所有字段,它也应该工作.我设法做了一半,但有时它给了我错误的结果.请帮忙.

Answer 1

您可以检查设置了哪些字段,并在运行时进行相应的查询.你可以这样做:

$query = "";
$keyword = $_REQUEST['keyword'];
$country = $_REQUEST['country'];
$category = $_REQUEST['category'];
if(isset($keyword)){//if keyword set goes here
   $query = "SELECT * FROM table1 WHERE Name LIKE '%$keyword%' OR ZipCode LIKE '%$keyword%' OR country LIKE '%$keyword%'";
   if(isset($category)){
     $query .= "AND category LIKE '$category'";
   }
   if(isset($country)){
     $query . = "AND country LIKE '$country'"
   }
}else if (isset($category)){ //if keyword not set but category set then goes here
  $query = "SELECT * FROM table1 WHERE category LIKE '$category'";
  if(isset($country)){
    $query . = "AND country LIKE '$country'";
  }
}else if(isset($country)){//if only country set goes here
  $query = "SELECT * FROM table1 WHERE country LIKE '$country'"
}