我有以下代码用于多个数据库连接。这不是好设计。一切都是静止的。但不知道如何改进它。我可以添加更多功能,如准备查询,但目前我想要好/干净的设计。我试图制作多重设计模式。要求是这样的,首先我将连接1个数据库,然后获取所有其他mysql客户端的数据库详细信息,然后循环并连接每个数据库并执行某些操作。所以,我需要多个连接。
<?php
class db_class{
private static $instance = array();
private function __construct(){ }
public static function get_instance($type , $db_detail_array=array()){
$host = $db_detail_array['host'];
$username = $db_detail_array['username'];
$database = $db_detail_array['database'];
$password = $db_detail_array['password'];
if(empty($host) or empty($username) or empty($database) or empty($password)){
return;
}
if(empty(self::$instance[$type])) {
self::$instance[$type] = new mysqli($host, $username, $password, $database);
if (@self::$instance[$type]->connect_errno) {
echo self::$last_err = "Connect failed";
}
}
}
static function fetch_assoc($query,$type){
$db_query = self::run_query($query,$type);
$rows = array();
while($row = @$db_query->fetch_assoc()){
$rows[] = $row;
}
$db_query->free();
return($rows);
}
static function escape($type,$value){
$value = self::$instance[$type]->real_escape_string($value);
return($value);
}
static function run_query($query,$type){
self::$instance[$type]->ping();
$db_query = self::$instance[$type]->query($query);
if(self::$instance[$type]->error){
echo self::$last_err = self::$instance[$type]->error;echo "<p>$query, $type</p>";
return;
}
return($db_query) ;
}
static function num_rows($query,$type){
$db_query = self::run_query($query,$type);
$num_rows = $db_query->num_rows;
return($num_rows);
}
static function disconnect($type){
@self::$db_obj[$type]->close();
}
}
?>