<?php
/**
 * 友链服务
 * @author wesmielr
 */
namespace app\index\service;
use think\Db;
class LinkService
{
    /**
     * 获取友链列表
     * @param $params 参数
     * @param int $num 获取数量
     * @param string $field 字段
     * @return array
     * @throws \think\db\exception\DataNotFoundException
     * @throws \think\db\exception\ModelNotFoundException
     * @throws \think\exception\DbException
     */
    public static function getList($params, $num=6, $field=''){
        $field = $field? $field : 'id,name,catname,url,image,target';
        return Db::name('link')->where(['status'=> 1])
            ->where(function($query) use($params){
                $catname = isset($params['catname'])? trim($params['catname']) : '';
                if($catname){
                    $query->where('catname', $catname);
                }
            })
            ->field($field)
            ->order('list_order')
            ->limit($num)
            ->select()
            ->toArray();
    }

}