sql语句排序

1，sqlserver中给top动态传值。

          DECLARE @topn AS int"

            SET @topn=?"

select Top  (@topn) * from user_info where   order by green_beans desc,nativeQuery=true)

sql server:

读取前10条：select top (10) * from table1 where 1=1 

读取后10条：select top (10) * from table1 order by id desc

2，mysql：

select * from table1 where 1=1 limit 10 

3，oracle：

select * from table1 where rownum<=10   

4,sql语句查询名次：

select Rank from (select RANK() OVER(order by green_beans desc,create_date asc) as Rank, open_id from bmc_weixin_user_info) R   where R.open_id = ‘11’

5,sqlserver中设置主键自增长：

        @Id

@Column(name="id")

@GeneratedValue(strategy=GenerationType.IDENTITY)

public Long getId() {

return id;

}

设置时间：

newPrizeRecord.setDate(Calendar.getInstance().getTime());

在mybatis中<=号的表示方法：<![CDATA[ and tran_time <= #{date2} ]]>