利用Sql Server的top分页查询的通用构造方式

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Sql Server中，假设一个查询sql为querySql，该sql为任意条件的组合，我们把它当作子查询结果表，可利用Sql Server的top来构造通用的分页查询sql：

if (pageInfo.getPageNum() == 1) {
      pagenatedSql = "select top " + pageInfo.pageSize + " * from (" + sql + ") as t1 " ;
}
else {
      pagenatedSql = "select top " + pageInfo.pageSize + " * from (" + sql + ") as t1 " +
            " where (t1." + indexKey + " > (select max(t3." + indexKey + ")" + 
            " from (select top " + (pageInfo.pageNum - 1) * pageInfo.pageSize + " t2." + indexKey + " from (" + sql + ") as t2 order by t2." + indexKey + ") as t3" +
            " )) order by t1." + indexKey;
}

其中pageInfo.getPageNum()为当前页号（从1开始）；pageInfo.getPageSize()为每页行数；indexKey为表中索引列，通常为递增的主键。

第二种方式：
pagesize： 每页显示记录数
cureentpage：当前页数

select * from (   select TOP pagesize * FROM ( SELECT TOP pagesize*cureentpage   * from user_table   ORDER BY id ASC ) as aSysTable   ORDER BY id DESC ) as bSysTable   ORDER BY id ASC