java sqlserver分页查询_实现sqlserver分页查询语句

实现sqlserver分页查询语句

sqlServer:

一次查询,数据库只返回一页的数据。而不是取出所有的数据。

pagesize: 每页显示记录数

cureentpage:当前页数

select * from (   select TOP pagesize * from ( SELECT TOP pagesize*cureentpage   * from my_table   ORDER BY id ASC ) as amyTable   ORDER BY id DESC ) as bmyTable   ORDER BY id ASC

假设共有有8条记录,每页显示3条记录,id 为3,6,7,37

第一页(首页)

select * from (   select TOP 3  * from ( SELECT TOP 3*1   * from my_table   ORDER BY id ASC ) as amyTable   ORDER BY id DESC ) as bmyTable   ORDER BY id ASC

第二页

select * from (   select TOP 3  * from ( SELECT TOP 3*2  * from my_table   ORDER BY id ASC ) as amyTable   ORDER BY id DESC ) as bmyTable   ORDER BY id ASC

第三页(尾页)

select * from (   select TOP 8-2*3  * from ( SELECT TOP 8-3*2  * from my_table   ORDER BY id ASC ) as amyTable   ORDER BY id DESC ) as bmyTable   ORDER BY id ASC

相关文档:

大部分人都知道用oledb来读取数据到dataset,但是读取之后怎么处理dataset就千奇百怪了。很多人通过循环来拼接sql,这样做不但容易出错而且效率低下,System.Data.SqlClient.SqlBulkCopy 对于新手来说还是比较陌生的,这个就是传说中效率极高的bcp,6万多数据从excel导入到sql只需要4.5秒。

using System;

......

写了一个存储过程对视图进行分页查询,但数据增多后发现基效率低得要命,三万多条数据要查询一个半小时都没出来,这不是要了命,于是想到了索引,应用过后仍无济于事。最后对sql进行分析和实践中得出,使用临时表可以大大加快视图的查询速度,见如下sql语句

性能超低的视图分页sql语句:

select top 100 * from

view_c ......

字符串函数:

● ASCII('a')=97---返回字母a对应的ASCII码

● CHAR('48')=0---返回48这个ASCII码对应的字符

● LCASE('ABcdE')="abced" 或 LOWER('ABcdE')="abced"(将给定字符串转为小写)

● UCASE('ABcdE')="ABCDE" 或 UPPER('ABcdE')="ABCDE"(将给定字符串转为大写)

● LTRIM('  fgf gh  ')="fgf ......

第一种 JavaScript连接数据库:

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