一、查询
Yii::app()->db->createCommand($sql)->queryAll();//查询所有行数据
Yii::app()->db->createCommand($sql)->queryRow();//查询第一行数据
Yii::app()->db->createCommand($sql)->queryColumn();//查询第一列数据
Yii::app()->db->createCommand($sql)->queryScalar();//查询第一行的第一字段
二、执行
Yii::app()->db->createCommand($sql)->execute();//创建、更新、删除，的执行
三、插入insert
$result =Yii::app()->db->createCommand()->insert('table表名', array(
'column1'=>$value1,
'column2'=>$value2,
'column3'=>$value3, 'create_time' => time(), ));获取插入id号：Yii::app()->db->getLastInsertID()
四、更新update
$result =Yii::app()->db->createCommand()->update('table表名', array(
'column1' => $value1 , 'column2' => $value2 ,'column3'=>$value3,
'update_time'=> time(),
),
"id=:id",array(':id'=>$id)
);
五、删除delete
$result =Yii::app()->db->createCommand()->delete('table表名',
"id=:id",array(':id'=>$id)
); 六、select其他写法 单表查询 $goodsTypes = Yii::app()->db->createCommand() ->select('type_id, type_name') ->from('goods_type') ->where('status=1') ->queryAll(); 连表查询 $goods = Yii::app()->db->createCommand() ->from('goods g') ->select('g.good_id, g.good_name, gt.type_name, g.price, g.buy_nums, g.commit_nums, g.create_time') ->join('goods_type gt', 'g.good_type=gt.type_id') ->where('g.`status`=1 and gt.`status`=1') ->order('g.create_time desc') ->queryAll(); // 首先要实例化一个CDbCommand对象 $command = Yii::app()->db->createCommand(); // 注意参数留空了。。 // 可用的方法列表如下： ->select(): SELECT子句 ->selectDistinct(): SELECT子句，并保持了记录的唯一性 ->from(): 构建FROM子句 ->where(): 构建WHERE子句 ->join(): 在FROM子句中构建INNER JOIN 子句 ->leftJoin(): 在FROM子句中构建左连接子句 ->rightJoin(): 在FROM子句中构建右连接子句 ->crossJoin(): 添加交叉查询片段(没用过) ->naturalJoin(): 添加一个自然连接子片段 ->group(): GROUP BY子句 ->having(): 类似于WHERE的子句，但要与GROUP BY连用 ->order(): ORDER BY子句 ->limit(): LIMIT子句的第一部分 ->offset(): LIMIT子句的第二部分 ->union(): appends a UNION query fragment举个实际的例子吧：
//查询列表 $command=Yii::app()->db->createCommand(); $command->select("a.*,b.user_name as create_user, e.department_name, c.supplier_name,c.supplier_operator,c.supplier_product,d.bank_name"); $command->from("ab_supplier_refund a"); $command->Leftjoin("ab_user b","a.create_user_id = b.id"); $command->Leftjoin("ab_suppliers c","a.supplier_id = c.supplier_id"); $command->Leftjoin("ab_bank d","a.bank_id = d.id"); $command->Leftjoin("ab_department e","b.user_department = e.id"); $command->andwhere("a.status != -1"); if(isset($where['start_time'])) { $command->andwhere("a.create_time >= " . $where['start_time']);//开始时间 } if(isset($where['end_time'])) { $command->andwhere("a.create_time <= " . $where['end_time']);//结束时间 } if(isset($where['search_all'])) { $search_all = strtr($where['search_all'], array('%'=>'\%', '_'=>'\_')); $in_int=intval($search_all); $command->andwhere("a.id ={$in_int} or b.user_name like '%{$search_all}%' or c.supplier_name like '%{$search_all}%' or c.supplier_operator in {$where['supplier_operator_or']} or c.supplier_product like '%{$search_all}%' or d.bank_name like '%{$search_all}%' "); } if(isset($where['refund_status'])) { $command->andwhere("a.status = " . $where['refund_status']); } if(isset($where['refund_id'])) { $command->andwhere("a.id = " . $where['refund_id']); } if(isset($where['create_user'])) { $command->andwhere("b.user_name like " . $where['create_user']); } if(isset($where['supplier_name'])) { $command->andwhere("c.supplier_name like " . $where['supplier_name']); } if(isset($where['supplier_operator'])) { $command->andwhere("c.supplier_operator = " . $where['supplier_operator']); } if(isset($where['supplier_product'])) { $command->andwhere("c.supplier_product like " . $where['supplier_product']); } if(isset($where['bank_name'])) { $command->andwhere("d.bank_name like " . $where['bank_name']); } if(isset($where['bank_id'])) { $command->andwhere("d.id = " . $where['bank_id']); } //排序条件 if(isset($order['refund_id'])){ $command->order(" a.id ".$order['refund_id']); } if(isset($order['create_time'])){ $command->order(" a.create_time ".$order['create_time']); } $command->limit($length, $start); $list=$command->queryAll();一般这样调用：
