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thinkphp的CURD和查询方式介绍_php技巧

May 17, 2016 am 08:52 AM
thinkphp inquiry mode

对数据的读取 Read

复制代码 代码如下:

$m=new Model('User');

$m=M('User');

select

$m->select();//获取所有数据,以数组形式返回

find

$m->find($id);//获取单条数据

getField(字段名)//获取一个具体的字段值

$arr=$m->where('id=2')->getField('username');


三、ThinkPHP 3 创建数据    (重点)

对数据的添加 Create

复制代码 代码如下:

$m=new Model('User');

$m=M('User');

$m->字段名=值

$m->add();


返回值是新增的id号

四、ThinkPHP 3 删除数据    (重点)

复制代码 代码如下:

$m=M('User');

$m->delete(2);               //删除id为2的数据

$m->where('id=2')->delete(); //与上面效果相同,也是删除id为2的数据


返回值是受影响行数

五、ThinkPHP 3 更新数据    (重点)

复制代码 代码如下:

$m=M('User');

$data['id']=1;

$data['username']='ztz2';

$m->save($data);            


返回值是受影响行数

============================================

一、普通查询方式

二、表达式查询方式

三、区间查询

四、统计查询

五、SQL直接查询

一、普通查询方式

a、字符串

复制代码 代码如下:

$arr=$m->where("sex=0 and username='gege'")->find();

b、数组
复制代码 代码如下:

$data['sex']=0;

$data['username']='gege';

$arr=$m->where($data)->find();


注意:这种方式默认是and的关系,如果使用or关系,需要添加数组值
复制代码 代码如下:

$data['sex']=0;

$data['username']='gege';

$data['_logic']='or';


二、表达式查询方式
复制代码 代码如下:

$data['id']=array('lt',6);

$arr=$m->where($data)->select();


EQ 等于

NEQ不等于

GT 大于

EGT大于等于

LT 小于

ELT小于等于

LIKE 模糊查询

复制代码 代码如下:

$data['username']=array('like','%ge');

$arr=$m->where($data)->select();

NOTLIKE

$data['username']=array('notlike','%ge%'); //notlike中间没有空格

    $arr=$m->where($data)->select();


 

注意:如果一个字段要匹配多个通配符

复制代码 代码如下:

$data['username']=array('like',array('%ge%','%2%','%五%'),'and');//如果没有第三个值,默认关系是or关系

$arr=$m->where($data)->select();

BETWEEN

$data['id']=array('between',array(5,7));

$arr=$m->where($data)->select();

//SELECT * FROM `tp_user` WHERE ( (`id` BETWEEN 5 AND 7 ) )

$data['id']=array('not between',array(5,7));//注意,not 和 between中间一定要有空格

$arr=$m->where($data)->select();

IN

$data['id']=array('in',array(4,6,7));

$arr=$m->where($data)->select();

//SELECT * FROM `tp_user` WHERE ( `id` IN (4,6,7) )

$data['id']=array('not in',array(4,6,7));

$arr=$m->where($data)->select();

//SELECT * FROM `tp_user` WHERE ( `id` NOT IN (4,6,7) )

三、区间查询

复制代码 代码如下:

$data['id']=array(array('gt',4),array('lt',10));//默认关系是 and 的关系

//SELECT * FROM `tp_user` WHERE ( (`id` > 4) AND (`id`

$data['id']=array(array('gt',4),array('lt',10),'or') //关系就是or的关系

$data['name']=array(array('like','%2%'),array('like','%五%'),'gege','or');


四、统计查询

count //获取个数

max   //获取最大数

min   //获取最小数

avg   //获取平均数

sum   //获取总和

五、SQL直接查询

a、query 主要数处理读取数据的

成功返回数据的结果集

失败返回boolean false

复制代码 代码如下:

$m=M();

$result=$m->query("select *  from t_user where id >50");

var_dump($result);


b、execute 用于更新个写入操作

成功返回影响行数

失败返回boolean false

复制代码 代码如下:

$m=M();

$result=$m->execute("insert into t_user(`username`) values('ztz3')");

var_dump($result);

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