thinkphp3.2.3 sql操作

数据库操作

1、查询多条记录，返回：二维数组

$result = $model->select();

$result = $model->field()->select();

$result = $model->where()->select();

$result = $model->order()->select();

$result = $model->limit()->select();

$result = $model->field()->where()->order()->limit()->select();

2、删除记录，返回：受影响的行数

$result = $model->delete();

$result = $model->where()->delete();

3、添加记录，返回：主键值(主键自增长)、受影响的行数(主键不是自增长)

$result = $model->add(一维关联的数组);

$result = $model->data(一维关联的数组)->add();

4、查询一条记录，返回：一维关联数组

$result = $model->find();

$result = $model->field()->find();

$result = $model->where()->find();

5、修改记录，返回：受影响的行数

$result = $model->save(一维关联数组);

$result = $model->where()->save(一维关联数组);

6、执行select语句，返回：二维数组

$result = M()->query("select语句");

7、执行insert、update、delete语句，返回：受影响的行数

$result = M()->execute("insert|update|delete语句");

8、聚合查询，返回：数字

$result = $model->where()->count();

$result = $model->where()->sum(字段);

$result = $model->where()->avg(字段);

$result = $model->where()->max(字段);

$result = $model->where()->min(字段);

9、多表查询

$result = $model->join("多表查询")->select();

$result = $model->join("多表查询")->find();

$newsInfo = M("newsarticles")->join("newstypes on newsarticles.typeId=newstypes.typeId")->select();

10、修改一个指定的字段

$result = $model->where()->save(一维关联数组);

$result = $model->where()->setField("字段名","字段值");

11、查询一个指定的字段

$result = $model->where()->getField("字段名");

12、让字段值递增

$result = $model->where()->setInc("字段名");//让字段值加1

$result = $model->where()->setInc("字段名",3);//让字段值加3

13、让字段值递减

$result = $model->where()->setDec("字段名");//让字段值减1

$result = $model->where()->setDec("字段名",3);//让字段值减3

SELECT * FROM [user] WHERE username LIKE '%三%'

Sql代码

select * from user where username like '%huxiao';

select * from user where username like 'huxiao%';

select * from user where username like '%huxiao%';

另外，如果需要找出username中既有“三”又有“四”的记录，请使用and条件

SELECT * FROM ［user］ WHERE u_name LIKE ‘%三%’ AND u_name LIKE ‘%四%’

若使用 SELECT * FROM ［user］ WHERE u_name LIKE ‘%三%四%’

虽然能搜索出“三二四”，但不能搜索出符合条件的“张四三”。

_：表示任意单个字符。匹配单个任意字符，它常用来限制表达式的字符长度语句：（可以代表一个中文字符）

Sql代码

select * from user where username like '_';

--------------------- 本文来自信纸的CSDN 博客，全文地址请点击：https://blog.csdn.net/bobby__star/article/details/70863562?utm_source=copy

thinkphp3.2.3 sql操作

猜你喜欢