thinkPHP多表查询及分页功能实现方法示例

// 异步请求试卷夹下某一个试卷夹的列表public function ajaxLists() {  extract($_GET);  $page = intval($_GET['p']);  $prefix = C('DB_PREFIX');  $collect = $prefix . 'collect';  $resource = $prefix . 'resource';  if ($keyword) {    $arr = preg_split('/ /', $keyword);    // 搜索标签    foreach ($arr as $value) {      $id = A('Home/Papers')->trunWordToId(array($value));      if ($id) {        $where['resource.rta_id'][] = array('LIKE', '%,' . $id . ',%');      }      $where['resource.re_title'][] = array('LIKE', '%' . $value . '%');    }    if ($where['resource.rta_id']) {      $where['resource.rta_id'][] = 'AND';    }    if ($where['resource.re_title']) {      $where['resource.re_title'][] = 'OR';    }    if ($where['resource.re_title'] && $where['resource.rta_id']) {      $where['_logic'] = 'OR';    }  }  if ($where) {    $map['_complex'] = $where;  }  $map['collect.a_id'] = $this->authInfo['a_id'];  $map['_string'] = 'collect.col_object_id = resource.re_id';  // 总数  $count = M()->table("$collect collect, $resource resource")->where($map)->count();  // 总页数  $regNum = ceil($count/6);  // 验证当前请求页码是否大于总页数  $page = $page > $regNum ? $regNum : $page;  // 引入ajax分页库  import("@.ORG.Util.AjaxPage");  $Page = new AjaxPage($count, 6);  $list['page'] = trim($Page->show());  $list['list'] = M()->table("$collect collect, $resource resource")->where($map)->order('col_id DESC')->limit($Page->firstRow . ',' . $Page->listRows)->field('collect.col_id,collect.col_object_id,resource.re_id,resource.re_title,resource.re_created,resource.re_collect_count,resource.re_score_count,resource.re_score_num,resource.rta_id')->select();  // 获取试卷的标签  $wheree['rta_id'] = array('IN', trim(str_replace(',,', ',', implode('', getValueByField($list['list'], 'rta_id'))), ','));  $tag = setArrayByField(M('ResourceTag')->where($wheree)->field('rta_id,rta_title')->select(), 'rta_id');  // 把标签和试卷对应  foreach ($list['list'] as $key => &$value) {    $str = '';    foreach ($tag as $k => $v) {      if (strpos($value['rta_id'], ',' . $k . ',') !== FALSE) {        $str .= ' | ' . $v['rta_title'];      }      $value['rta_title'] = trim($str, ' |');    }    if ($keyword) {      foreach ($arr as $vv) {        if (strpos($value['re_title'], $vv) !== FALSE) {          $value['re_title'] = str_replace($vv, '<font color=/'red/'>' . $vv . '</font>', $value['re_title']);        }        if (strpos($value['rta_title'], $vv) !== FALSE) {          $value['rta_title'] = str_replace($vv, '<font color=/'red/'>' . $vv . '</font>', $value['rta_title']);        }      }    }    $value['re_created'] = date('Y-m-d', $value['re_created']);  }  echo json_encode($list);}