ThinkPHP中的常用查询语言汇总,thinkphp语言汇总
ThinkPHP中的常用查询语言汇总,thinkphp语言汇总
本文实例汇总了ThinkPHP中的常用查询语言,供大家参考之用。相信能给大家ThinkPHP开发带来一定的帮助。具体如下:
一、普通查询:
在查询带入where条件等,最少有三种形式
1、字符串形式:
'id>5 and id<9'
2、数组形式:
示例代码如下:
$user=M('user'); $data['username']='liwenkai'; $list=$user->where(array('username'=>'liwenkai'))->select(); $list=$user->where($data)->select();
3、对象形式:
示例代码如下:
$user=M('user'); $a=new stdClass(); $a->username='liwenkai'; $list=$user->where($a)->select();
4、查询表达式:
EQ 等于
NEQ 不等于
GT 大于
EGT 大于等于
LT 小于
ELT 小于等于
LIKE 等价与sql中的like
[NOT] BETWEEN 查询区间
[NOT] IN 查询集合
EXP 指使用标准SQL语句,实现更加复杂的情况
常用形式:
$data['字段名']=array('是表达式','查询条件');
此外
$data['liwenkai']='liwenkai';
实际上等价于
$data['liwenkai']=array('eq','liwenkai');
示例如下:
$data['username']=array('like','peng%'); $list=$user->where($data)->select();
二、区间查询:
示例如下:
$user=M('user'); $data['id']=array(array('gt',20),array('lt',23),'and'); $list=$user->where($data)->select(); dump($list);
$data['username']=array(array('like','p%'),array('like','h%'),'or');
三、组合查询:
示例如下:
$user=M('user'); $data['username']='pengyanjie'; $data['password']=array('eq','pengyanjie'); $data['id']=array('lt',30); $data['_logic']='or'; $list=$user->where($data)->select(); dump($list);
四、复合查询:
示例如下:
$user=M('user'); $data['username']=array('eq','pengyanjie'); $data['password']=array('like','p%'); $data['_logic']='or'; $where['_complex']=$where; $where['id']=array('lt',30); $list=$user->where($data)->select(); dump($list);
相当于
(id<30)and ( (username=pengyanjie) or (password like p%) )
五、统计查询:
示例如下:
echo $user->count(); echo '<br>'; echo $user->max('id'); echo '<br>'; echo $user->where('id<30')->min('id'); echo '<br>'; echo $user->avg('id'); echo '<br>'; echo $user->sum('id');
六、定位查询:
示例如下:
$user=new AdvModel('user');//实例化高级模型AdvModel //$user=M('user','CommonModel');//或者将AdvModel用CommonModel来继承 $list=$user->order('id desc')->getN(2);//返回结果中的第三条 dump($list); $list=$user->order('id desc')->last();//返回最后一条 $list=$user->order('id desc')->first();//返回第一条
七、SQL查询:
1.excute()主要用于更新和写入:
$Model = new Model() // 实例化一个 model 对象 没有对应任何数据表 $Model->execute( "update think_user set name='thinkPHP' where status=1" );
2.query()主要用于查询:
$user=M(); $list=$user->query('select * from aoli_user order by id desc'); dump($list);
八、动态查询
示例如下:
$user=M('user'); $list=$user->getByusername('pengyanjie'); $list=$user->getByusername('pengyanjie'); dump($list);
$user=new AdvModel('user'); $list=$user->top5();//前5条 dump($list);
感兴趣的朋友可以在ThinkPHP项目中调试运行本文示例,相信会有新的收获。
$res=$student->field('id,name')->select();/*你要查询出所有的id和name 那么条件就不写了,否则不能查询出所有的最好在后面加个limit限制下数据量,万一是大型网站,海量数据,你的查询工具就卡了,浏览器刷屏了!*/
随着使用的深入,之前很多疑问都会不断的解开。
初学者不要抱着批判的眼光,每个功能都有其实际的使用意义,初期选用自己觉得喜欢的方法就行,等到了高手的层次再来挑刺。

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