THINKphp中复杂的查询

• 字符串拼接查询

  案例一:拼接字符串(多条件查询)        

  $where = '';   //定义字符串,用于拼接满足条件的数据字段
          $value = [];　 // 定义空数组,用于接收值
          if(!empty($nickname)){
              $where .= ' and nickname = :nickname'; //数据表字段
              $value['nickname'] = $nickname;  //赋值
          }
          if(!empty($phone)){
              $where .= ' and mobile = :mobile';
              $value['mobile'] = $phone;
          }
          if(!empty($user_status)){
              $where .= ' and user_status = :user_status';
              $value['user_status'] = $user_status;
          }
  
          if(!empty($reg_start_end)){
              $start_end = explode('|',$reg_start_end);
              if(!empty($start_end[0])){
                  $where .= ' and create_time > :start_time';
                  $value['start_time'] = strtotime($start_end[0]);
              }
              if(!empty($start_end[1])){
                  $where .= ' and create_time <= :end_time';
                  $value['end_time'] = strtotime($start_end[1]);
              }
          }
  
          if(!empty($is_proxy)){
              $where .= ' and is_proxy = :is_proxy';
              $value['is_proxy'] = $is_proxy;
          }
          if(!empty($sex)){
              $where .= ' and gender = :gender';
              $value['gender'] = $sex;
          }$list  = $obj->whereraw('1=1'.$where.'', $value)->limit($limit_start, $limit_length)->order('create_time', 'asc')->select();  //查询满足条件的数据
  　　     db::table('表名') ->whereraw('id = :id and name like :name ', ['id' => 0, 'name' => 'thinkphp%']) ->select();  //形成的原生sql语句.
  
  
  
  案例二:快捷查询
  快捷查询方式是一种多字段相同查询条件的简化写法，可以进一步简化查询条件的写法，在多个字段之间用|分割表示or查询，用&分割表示and查询，可以实现下面的查询，例如：
  

  db::table('think_user')
      ->where('name|title','like','%thinkphp%')
      ->where('create_time&update_time','>',0)
      ->find();
  
  生成的查询sql如下：
  select * from `think_user` where ( `name` like 'thinkphp%' or `title` like 'thinkphp%' ) and ( `create_time` > 0 and `update_time` > 0 ) limit 1 

  select * from `think_user` where ( `name` like 'thinkphp%' or `title` like 'thinkphp%' ) and ( `create_time` > 0 and `update_time` > 0 ) limit 1;
  
  
  
  案例三: 拼接字符串查询
  $where  = '';
    if ($status != 'all') {
          $where .= ' and status=' . $status;  //拼接满足条件的表字段
  }