ThinkPHP多表查询处理
ThinkPHP多表连接查询处理
ThinkPHP关联查询(多表查询)
网上找到三种方法:table()、join()、原生SQL语句查询。(以下三种方法输出结果一致,并且很好的保留了ThinkPHP自己的分页功能)
第一种:table()方法
实例:需要连接查询两张表(表agent和表transinfo)
$Model=new Model();
$sqlcount="select count(*) as mycount from agent a ,transinfo t where t.clientId=a.id and t.transType like '%agent%' and a.id in (".$agent_str.")";
$listCount = $Model ->query($sqlcount);
$Page = new Page ( $listCount[0][mycount], 2 );
$show = $Page->show ();
$list = $Model->table('agent a, transinfo t')->where("t.clientId=a.id and t.transType like '%agent%' and a.id in (".$agent_str.")")->limit ( $Page->firstRow . ',' . $Page->listRows )->select();
//echo $Model->getLastSql();
$this->assign('list',$list);// 赋值数据集
$this->assign('page',$show);// 赋值分页输出
第二种:join()方法
实例:需要连接查询两张表(表agent和表transinfo)
$Model=new Model();
$agentModel = $Model->Table("agent");
$listCount = $agentModel->join(" AS a RIGHT JOIN transinfo t ON t.clientId=a.id and t.transType like '%agent%' and a.id in (".$agent_str.")")
->field("count(*) as mycount")
->select();
$Page = new Page ( $listCount[0][mycount], 2 );
$show = $Page->show ();
$Model=new Model();
$agentModel = $Model->Table("agent");
$list = $agentModel->join(" AS a RIGHT JOIN transinfo t ON t.clientId=a.id and t.transType like '%agent%' and a.id in (".$agent_str.") order by t.id DESC limit ".$Page->firstRow.",".$Page->listRows)
->field("a.*,t.*")
->select();
//echo $agentModel->getLastSql();
$this->assign('list',$list);// 赋值数据集
$this->assign('page',$show);// 赋值分页输出
提示:你也可以这样实例化更简洁(官方推荐的):$agentModel = M('Agent'); // 实例化User对象
第三种:原生SQL语句查询法
$Model=new Model();
$sqlcount="select count(*) as mycount from agent a ,transinfo t where t.clientId=a.id ".$where. " and t.transType like '%agent%' and a.id in (".$agent_str.")";
$listCount = $Model ->query($sqlcount);
$Page = new Page($listCount[0]['mycount'],2);// 实例化分页类 传入总记录数和每页显示的记录数
$show = $Page->show();
$sqlList="select t.*,a.* from agent a ,transinfo t where t.clientId=a.id ".$where. " and t.transType like '%agent%' and a.id in (".$agent_str.") limit {$Page->firstRow},{$Page->listRows}";
$list = $Model ->query($sqlList);
$this->assign('list',$list);// 赋值数据集
$this->assign('page',$show);// 赋值分页输出
参考资料:
http://hi.baidu.com/wjlhh001/item/18d9a91031081b5e2a3e22af
http://www.yunda51.com/304.html
http://www.w3school.com.cn/sql/sql_join_right.asp
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