Discuz x2.5 x3.0如何配置连接多个数据库同时使用

修改 conf/config_global.php

$_config['db']['map']=array('表名1'=>'2','表名2'=>'2);  

//这里面2对应映射配置  
$_config['db']['2']['dbhost'] = 'localhost';  
$_config['db']['2']['dbuser'] = 'root';  
$_config['db']['2']['dbpw'] = '';  
$_config['db']['2']['dbcharset'] = 'gbk';  
$_config['db']['2']['pconnect'] = '0';  
$_config['db']['2']['dbname'] = '数据库名';  
//这个参数其实没有用，要照我随后的修改就可以用了  
$_config['db']['2']['tablepre'] = 'cdb_';  

修改 source/class/db/db_driver_mysql.php 找到 table_name 函数

    function table_name($tablename) {
        if(!empty($this->map) && !empty($this->map[$tablename])) {
            $id = $this->map[$tablename];
            if(!$this->link[$id]) {
                $this->connect($id);
            }
            $this->curlink = $this->link[$id];
            //增加了这一句
            return $this->config[$id]['tablepre'].$tablename;
        } else {
            $this->curlink = $this->link[1];
        }
        return $this->tablepre.$tablename;
    }

执行连接

print_r(DB::fetch_first("SELECT * FROM ".DB::table('nav')." limit 1"));