SQL server 分页方法小结
这里面介绍一下常用的分页方法：1.使用top来分页
select top @pageSize * from table where id not in
(select top @pageSize*(@pageIndex-1) id from table)
SELECT * FROM (
SELECT TOP 页面容量 * FROM (
SELECT TOP 页面容量*当前页码 * FROM
表 WHERE 条件 ORDER BY 字段A ASC
) AS TEMPTABLE1 ORDER BY 字段A DESC
) AS TEMPTABLE2 ORDER BY 字段A ASC
2.使用 ROW_NUMBER()OVER
SELECT * FROM (SELECT ROW_NUMBER() OVER (order by T.字段名 desc )AS Row, T.*from 表名 TWHERE 条件 ) TT WHERE TT.Row between 起始位置and 结束位置;
StringBuilder strSql = new StringBuilder();
strSql.Append("SELECT * FROM ( ");
strSql.Append(" SELECT ROW_NUMBER() OVER (");
if (!string.IsNullOrWhiteSpace(orderby.Trim()))
{
strSql.Append("order by T." + orderby);
}
else
{
strSql.Append("order by T.ID desc");
}
strSql.Append(")AS Row, T.*from TableName T ");
if (!string.IsNullOrWhiteSpace(strWhere.Trim()))
{
strSql.Append(" WHERE " + strWhere);
}
strSql.Append(" ) TT");
strSql.AppendFormat(" WHERE TT.Row between {0} and {1}", startIndex, endIndex);
3.使用分页存储过程
if exists (select * from dbo.sysobjects where id = object_id(N'.') and OBJECTPROPERTY(id, N'IsProcedure') = 1)
drop procedure .
GO
CREATE PROCEDURE .
@PCount int output, --总页数输出
@RCount int output, --总记录数输出
@sys_Table nvarchar(100), --查询表名
@sys_Key varchar(50), --主键
@sys_Fields nvarchar(500), --查询字段
@sys_Where nvarchar(3000), --查询条件
@sys_Order nvarchar(100), --排序字段
@sys_Begin int, --开始位置
@sys_PageIndex int, --当前页数
@sys_PageSize int --页大小
AS
SET NOCOUNT ON
SET ANSI_WARNINGS ON
IF @sys_PageSize < 0 OR @sys_PageIndex < 0
BEGIN
RETURN
END
DECLARE @new_where1 NVARCHAR(3000)
DECLARE @new_order1 NVARCHAR(100)
DECLARE @new_order2 NVARCHAR(100)
DECLARE @Sql NVARCHAR(4000)
DECLARE @SqlCount NVARCHAR(4000)
DECLARE @Top int
if(@sys_Begin <=0)
set @sys_Begin=0
else
set @sys_Begin=@sys_Begin-1
IF ISNULL(@sys_Where,'') = ''
SET @new_where1 = ' '
ELSE
SET @new_where1 = ' WHERE ' + @sys_Where
IF ISNULL(@sys_Order,'') <> ''
BEGIN
SET @new_order1 = ' ORDER BY ' + Replace(@sys_Order,'desc','')
SET @new_order1 = Replace(@new_order1,'asc','desc')
SET @new_order2 = ' ORDER BY ' + @sys_Order
END
ELSE
BEGIN
SET @new_order1 = ' ORDER BY ID DESC'
SET @new_order2 = ' ORDER BY ID ASC'
END
SET @SqlCount = 'SELECT @RCount=COUNT(1),@PCount=CEILING((COUNT(1)+0.0)/'
+ CAST(@sys_PageSize AS NVARCHAR)+') FROM ' + @sys_Table + @new_where1
EXEC SP_EXECUTESQL @SqlCount,N'@RCount INT OUTPUT,@PCount INT OUTPUT',
@RCount OUTPUT,@PCount OUTPUT
IF @sys_PageIndex > CEILING((@RCount+0.0)/@sys_PageSize) --如果输入的当前页数大于实际总页数,则把实际总页数赋值给当前页数
BEGIN
SET @sys_PageIndex =CEILING((@RCount+0.0)/@sys_PageSize)
END
set @sql = 'select '+ @sys_fields +' from ' + @sys_Table + ' w1 '
+ ' where '+ @sys_Key +' in ('
+'select top '+ ltrim(str(@sys_PageSize)) +' ' + @sys_Key + ' from '
+'('
+'select top ' + ltrim(STR(@sys_PageSize * @sys_PageIndex + @sys_Begin)) + ' ' + @sys_Key + ' FROM '
+ @sys_Table + @new_where1 + @new_order2
+') w ' + @new_order1
+') ' + @new_order2
print(@sql)
Exec(@sql)
GO
create proc .
(
@pageindex int, ---当前页的索引
@pagesiz int,--一页显示多少条
@tablename nvarchar(100),---要分页的表名
@prikey varchar(50),--要分页的表名的主键
@condtion varchar(5000),----查询条件
@pagecount int out----按照查询条件查询出的总页数
)
as
-----第一步构建查询的sql语句--------
declare @sql nvarchar(4000), ---查询语句
@recrdcount int,----记录数据的总行数
@startindex int,---当前页的第一条数据的行号
@endindex int----当前页的最后一条数据的行号
set @sql = 'Select @rCount= count(*)From '+@tablename+' Where 1= 1 ';---查询除所有的数据并得到数据行数
if @condtion is not null and @condtion <>N''---当查询条件不为空的时候和不等于“”
begin
set @sql=@sql+@condtion;---@sql+查询条件
end
print @sql
----利用sp_executesql这个存储过程来执行@sql，
--N'@rcount int out 同@sql中的@rcount对应声明变量，将@recrdcount赋值替换@rcount
exec sp_executesql @sql,N'@rcount int out',@recrdcount out;
---计算最大分页数
set @pagecount=CEILING(@recrdcount*1.0/@pagesiz);--ceiling函数就是将小数位抹去并在整数位加1，
if(@pageindex>@pagecount)---当当前页的页码大于最大页的页码
begin
set @pageindex=@pagecount ---设置当前页的页码为最大页的页码
end
set @startindex=(@pageindex-1)*@pagesiz+1---设置当前页的起始行号
set @endindex =@pageindex*@pagesiz ----设置当前页的最后一条数据的行号
---构建分页的sql
set @sql=''
set @sql='select row_number() over (order by '+@prikey+' asc)as rowid,*from ' + @tablename +' where 1=1'---开窗函数获取当前查询表的数据行数
if @condtion is not null and @condtion <>N'' --如果查询条件不为空
begin
set @sql=@sql+@condtion ---为sql加上查询条件
end
set @sql = 'Select * From ('+@sql+') as tc where tc.rowid between '+convert(varchar(5),@startIndex)+' and '+convert(varchar(5),@endIndex)+'';
print @sql
exec (@sql)
GO
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