tp5(thinkPHP5)框架实现多数据库查询的方法

<?php
// +----------------------------------------------------------------------
// | ThinkPHP [ WE CAN DO IT JUST THINK ]
// +----------------------------------------------------------------------
// | Copyright (c) 2006~2016 http://thinkphp.cn All rights reserved.
// +----------------------------------------------------------------------
// | Licensed ( http://www.apache.org/licenses/LICENSE-2.0 )
// +----------------------------------------------------------------------
// | Author: liu21st <liu21st@gmail.com>
// +----------------------------------------------------------------------
return [
  // 数据库类型
  'type'      => 'mysql',
  // 服务器地址
  'hostname'    => '',
  // 数据库名
  'database'    => '',
  // 数据库用户名
  'username'    => '',
  // 数据库密码
  'password'    => '',
  // 数据库连接端口
  'hostport'    => '3306',
  // 数据库编码默认采用utf8
  'charset'     => '',
  // 数据库表前缀
  'prefix'     => ''
];

<?php
namespace app\admin\model;
use think\Model;
use think\Db;
class LiveRecharge extends Model
{
  protected $db_app;
  function __construct()
  {
    $this->db_app = Db::connect('database_app');
  }
}

$this->db_app->table('order')->select();

<?php
namespace app\admin\model;
use think\Model;
use think\Db;
class LiveRecharge extends Model
{
  protected $db_app;
  function __construct()
  {
    $this->db_app = Db::connect('database_app');
  }
  // 获取分页
  public function getList($customer_id = '',$nickname = '',$paytime = '',$pagesize = '')
  {
    $pagesize = $pagesize && $pagesize > 0 ? $pagesize : config('default_page_size');
    $where = array();
    $where['o.type'] = 3;
    if ($customer_id) {
      $where['o.uid'] = $customer_id;
    }
    if ($nickname) {
      $where['c.NickName'] = ['like','%'.$nickname.'%'];
    }
    if ($paytime) {
      $where['o.addtime'] = array(['>',$paytime.' 00:00'], ['<',$paytime.' 23:59']);
    }
    $result = $this->db_app->table('order')
      ->alias('o')
      ->where($where)
      ->join('customer c','o.uid = c.Id')
      ->field('o.*,c.NickName as nickname')->paginate($pagesize,false,[
        'query' => [
          'customer_id'=>$customer_id,
          'nickname'=>$nickname,
          'paytime'=>$paytime
        ]
      ]);
    $page = $result->render(); // 分页
    $data = $result->all(); // 数据
    foreach ($data as $k=>$v) {
      $data[$k]['diamond'] = intval($v['money'])*10;
    }
    //    dump($this->db_app->getLastSql());
    $total_diamond = $this->db_app->table('order')->where('type',3)->sum('money*10');
    $outData['page'] = $page;
    $outData['data'] = $data;
    $outData['total_diamond'] = $total_diamond;
    return $outData;
  }
}