Question

上帝该死我对MYSQL查询的语法感到困惑。

这是否正确...无法在互联网上找到类似的条目。

$query_game_string = '';

while($game = mysql_fetch_assoc($get_game_list)){
    $query_game_string .= ' OR target = "' . $game['id'] . '" AND ancestors = "0"';   
}

echo '' . $query_game_string . '';  

//prints: OR target = "11" AND ancestors = "0" OR target = "12" AND ancestors = "0" OR target = "27" AND ancestors = "0" OR target = "29" AND ancestors = "0" OR target = "32" AND ancestors = "0"


        $database->connect(); 

            $comments = mysql_query(
                'SELECT * 
                    FROM ' . $database->db_prefix . 'comments 
                        WHERE user_id = "' . $user->user_object["id"] . '"' .
                        $query_game_string . '                                    
                        ORDER BY created DESC'
            , $database->connection_handle);                     

        $database->close();

所以实际的查询总是：

'SELECT * 
    FROM ' . $database->db_prefix . 'comments 
        WHERE user_id = "' . $user->user_object["id"] . '"' .
        'OR target = "11" AND ancestors = "0" OR target = "12" AND ancestors = "0" OR target = "27" AND ancestors = "0" OR target = "29" AND ancestors = "0" OR target = "32" AND ancestors = "0"' . '                                    
        ORDER BY created DESC'

语法还可以吗？

Answer 1

不确切地知道你在寻找什么，但可能你需要括号：

OR (target = "11" AND ancestors = "0")
OR (target = "12" AND ancestors = "0")
OR (target = "27" AND ancestors = "0")
OR (target = "29" AND ancestors = "0")
OR (target = "32" AND ancestors = "0")

php实现：

while($game = mysql_fetch_assoc($get_game_list))
{
    $query_game_string .= ' OR (target = "' . $game['id'] . '" AND ancestors = "0")';   
}

简化查询的一种方法是使用IN操作数

 OR target IN("11","12","27","29","32") AND ancestors = "0"

PHP：

$targets = array();
while($game = mysql_fetch_assoc($get_game_list))
{
    $targets[] = '"'.$game['id'].'"';   
}
$query_game_string = ' OR target IN (' . implode(",",$targets) . ') AND ancestors = "0"';

在哪里或多次使用MYSQL

1 个答案: