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峰回掠影的博客
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+=   -=   *=   /= 

上面的运算符 会把初始值和右边的值进行处理,处理结果 在复制给左边的变量

 

if  适合不确定的判断

switch 适合确定多少个值的判断

 

数据库

插入数据库数据

INSERT  INTO   '数据库名'( ‘字段’,‘age’,‘’)

VALUES('数据',‘24 ’,‘数据’)

修改数据

UPDATE  ‘表面’SET  '字段名'=‘修改内容’

WHERE   条件  ''

 

删除 

DELETE ROM   '表面'

WHERE 'ID' = '1'

查询

SELECT  * FROM  '表名'

WHERE ' ID' = 4

ORDER BY   ID  asc  正序

 desc 倒序

LIMIT   条

 

 

CREATE  

UPDATE

RETRIEVE

DELETE

 

 

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