Question

我有一组处理数据库连接的函数。我想在这里添加另一个连接，这样我就可以与当前的数据库同时访问另一个数据库。有什么建议？

我正在寻找解决方案的原因是因为我使用的脚本具有非常复杂的查询，我希望能够简单地在其前面添加数据库名称，而不是重写那些复杂的查询。

以下是连接数据库的功能：

function db(){

    $this->host = DATABASE_HOST;
    $this->port = DATABASE_PORT;
    $this->socket = DATABASE_SOCK;
    $this->dbname = DATABASE_NAME;
    $this->user = DATABASE_USER;
    $this->password = DATABASE_PASS;
    $this->current_arr_type = MYSQL_ASSOC;

    //  connect to db automatically
    if (empty($GLOBALS['bx_db_link'])) {
        $this->connect();
        $GLOBALS['gl_db_cache'] = array();
        $GLOBALS['bx_db_param'] = array();
    }
    else
        $this->link = $GLOBALS['bx_db_link'];

    if(empty($GLOBALS['bx_db_param']))
        $GLOBALS['bx_db_param'] = new BxDolParams($this);

    $this->oParams = &$GLOBALS['bx_db_param'];
}

/**
 * connect to database with appointed parameters
 */
function connect()
{
    $full_host = $this->host;
    $full_host .= $this->port ? ':'.$this->port : '';
    $full_host .= $this->socket ? ':'.$this->socket : '';

    $this->link = @mysql_pconnect($full_host, $this->user, $this->password);
    if (!$this->link)
        $this->error('Database connect failed', true);

    if (!$this->select_db())
        $this->error('Database select failed', true);

    $this->res("SET NAMES 'utf8'");
    $this->res("SET sql_mode = ''");

    $GLOBALS['bx_db_link'] = $this->link;
}

function select_db()
{
    return @mysql_select_db($this->dbname, $this->link) or $this->error('Cannot complete query (select_db)');
}

/**
 * close mysql connection
 */
function close()
{
    mysql_close($this->link);
}

这是一个我不想重写的Query示例。我只需要连接到单独数据库上的Profiles表：

$sQuery = "
    SELECT
        `tp`.`ID` as `id`,
        `tp`.`NickName` AS `username`,
        `tp`.`Headline` AS `headline`,
        `tp`.`Sex` AS `sex`,
        `tp`.`DateOfBirth` AS `date_of_birth`,
        `tp`.`Country` AS `country`,
        `tp`.`City` AS `city`,
        `tp`.`DescriptionMe` AS `description`,
        `tp`.`Email` AS `email`,
        DATE_FORMAT(`tp`.`DateReg`,  '" . $sDateFormat . "' ) AS `registration`,
        DATE_FORMAT(`tp`.`DateLastLogin`,  '" . $sDateFormat . "' ) AS `last_login`,
        `tp`.`Status` AS `status`,
        IF(`tbl`.`Time`='0' OR DATE_ADD(`tbl`.`DateTime`, INTERVAL `tbl`.`Time` HOUR)>NOW(), 1, 0) AS `banned`, 
        `tl`.`ID` AS `ml_id`, 
        IF(ISNULL(`tl`.`Name`),'', `tl`.`Name`) AS `ml_name`
        " . $sSelectClause . "
    FROM `Profiles` AS `tp` 
    LEFT JOIN `sys_admin_ban_list` AS `tbl` ON `tp`.`ID`=`tbl`.`ProfID`
    LEFT JOIN `sys_acl_levels_members` AS `tlm` ON `tp`.`ID`=`tlm`.`IDMember` AND `tlm`.`DateStarts` < NOW() AND (`tlm`.`DateExpires`>NOW() || ISNULL(`tlm`.`DateExpires`))  
    LEFT JOIN `sys_acl_levels` AS `tl` ON `tlm`.`IDLevel`=`tl`.`ID` 
    " . $sJoinClause . "
    WHERE
        1 AND (`tp`.`Couple`=0 OR `tp`.`Couple`>`tp`.`ID`)" . $sWhereClause . "
    " . $sGroupClause . "
    ORDER BY `tp`.`" . $aParams['view_order'] . "` " . $aParams['view_order_way'] . "
    LIMIT " . $aParams['view_start'] . ", " . $aParams['view_per_page'];

Answer 1

您可以重新构建类以保存连接数组，然后将连接索引添加到类中的每个方法。

$db->query(1, ".....");
$db->connect(1, "localhost", "username", "password");

一个时髦的方法可能是引入一个getConnection()方法，选择一个数据库连接作为当前连接，然后像这样执行你的查询：

$db->getConnection(1)->connect("localhost", "username", "password", "database");
$db->getConnection(1)->query(".....");

该方法必须看起来像这样：

function getConnection($conn)
 {
  $this->useConnection = $conn;
  return $this;
 }

显然，对于这种方法，您的类中的每个方法都必须对useConnection属性敏感。

添加另一个数据库连接到函数

1 个答案: