Query languages ​​commonly used in ThinkPHP

This article mainly introduces a summary of common query languages ​​​​in ThinkPHP. It is a commonly used technique in ThinkPHP. It is very practical in project development. Friends in need can refer to it.

This article summarizes the examples of ThinkPHP Commonly used query languages ​​in are provided for your reference. I believe it can bring some help to everyone's ThinkPHP development. The details are as follows:

1. Ordinary query:

When the query brings in where conditions, etc., there are at least three forms

1. Characters String form:

&#39;id>5 and id<9&#39;

2. Array form:

The sample code is as follows:

$user=M('user');
$data['username']='liwenkai';
$list=$user->where(array('username'=>'liwenkai'))->select();
$list=$user->where($data)->select();

3. Object form:

The sample code is as follows:

$user=M('user');
$a=new stdClass();
$a->username='liwenkai';
$list=$user->where($a)->select();

4. Query expression:

EQ                                                                                                                                                                       can be equal to
NEQ                         can not be equal to
GT              can be greater than
EG can             can be greater than or equal to
LT               can ELT Less than or equal to
LIKE Equivalent to like
[NOT] BETWEEN in SQL
Commonly used forms:

$data['字段名']=array('是表达式','查询条件');

In addition

$data['liwenkai']='liwenkai';

is actually equivalent to

$data['liwenkai']=array('eq','liwenkai');

The example is as follows:

$data['username']=array('like','peng%');
$list=$user->where($data)->select();

Examples are as follows:

$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');

The example is as follows:

$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);

##4. Compound query:

$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);

(id<30)and ( (username=pengyanjie) or (password like p%) )

5. Statistical query:

echo $user->count();
echo &#39;<br>&#39;;
echo $user->max(&#39;id&#39;);
echo &#39;<br>&#39;;
echo $user->where(&#39;id<30&#39;)->min(&#39;id&#39;);
echo &#39;<br>&#39;;
echo $user->avg(&#39;id&#39;);
echo &#39;<br>&#39;;
echo $user->sum(&#39;id&#39;);

6. Positioning query:

$user=new AdvModel('user');//实例化高级模型AdvModel
//$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

7. SQL query:

1.excute() is mainly used for updating and Write:

$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() is mainly used to query:

$user=M();
$list=$user->query('select * from aoli_user order by id desc');
dump($list);

The example is as follows:

$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);

The above is the entire content of this article. I hope it will be helpful to everyone’s study. For more related content, please pay attention to the PHP Chinese website!

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