douyang2530 2016-04-12 03:25
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使用PHP在mysql查询中创建动态AND子句

I am writing SQL Query based on array values but I am getting the wrong result.

For Example if my array values are ['PAK','USA'] then Query should be:-

Select * From `search` WHERE country = 'PAK' AND country = 'USA'

and if array values are ['USA','China'] then Query should be:-

Select * From `search` WHERE country = 'USA' AND country = 'China'

and so on..

I am doing this but I am getting the wrong result like this:-

SELECT * FROM `search` WHERE country = '' AND country = 'Pakistan' AND country = 'United States'

I am wondering why country = '' is always adding at the beginning of Query.. This is why I am getting the wrong result. Please help me out. Thanks in advance.. Below is my code..

PHP

$query_parts = array();

foreach($_POST['countryArray'] as $array){          
    $query_parts[] = "'".$array."'";
}
$string = implode(' AND country = ', $query_parts);
//echo $string;

$query =  "SELECT * FROM `search` WHERE country = {$string}";

echo $query;
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1条回答 默认 最新

  • dtjzpg5313 2016-04-12 03:27
    关注

    The code is fine.

    But, blank elements from array are not restricted.

    The array $_POST['countryArray'] has a blank element.

    You can filter it with array_filter():

    $_POST['countryArray'] = array_filter($_POST['countryArray']);
    

    Final Code:

    $query_parts = array();
    $_POST['countryArray'] = array_filter($_POST['countryArray']);
    foreach($_POST['countryArray'] as $array){
      $query_parts[] = "'".$array."'";
    }
    $string = implode(' AND country = ', $query_parts);
    //echo $string;
    $query =  "SELECT * FROM `search` WHERE country = {$string}";
    echo $query;
    
    本回答被题主选为最佳回答 , 对您是否有帮助呢?
    评论
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