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asp.net海量分页数据存储过程

2012-12-18 15:42 405 查看

存储过程1

CREATE
PROCEDURE pagination

@tblName varchar(255),
-- 表名
@strGetFields varchar(1000) =
'*',
-- 需要返回的列
@fldName varchar(255)='',
-- 排序的字段名
@PageSize int ,
-- 页尺寸
@PageIndex int,
-- 页码
@doCount bit ,
-- 返回记录总数, 非 0 值则返回

@OrderType bit ,
-- 设置排序类型, 非 0 值则降序

@strWhere varchar(1500) =
''
-- 查询条件 (注意: 不要加 where)

AS

declare @strSQL
varchar(5000)
-- 主语句
declare @strTmp
varchar(110)
-- 临时变量
declare @strOrder
varchar(400)
-- 排序类型

if @doCount != 0
begin

if @strWhere !=''

set @strSQL =
"select count(*) as Total from [" + @tblName +
"] where "+@strWhere

else

set @strSQL =
"select count(*) as Total from [" + @tblName +
"]"

end

--以上代码的意思是如果@doCount传递过来的不是0，就执行总数统计。以下的所有代码都是@doCount为0的情况

else

begin

if @OrderType != 0
begin

set @strTmp =
"<(select min"

set @strOrder =
" order by [" + @fldName +"] desc"

--如果@OrderType不是0，就执行降序，这句很重要！

end

else

begin

set @strTmp =
">(select max"

set @strOrder =
" order by [" + @fldName +"] asc"

end

if @PageIndex = 1
begin

if @strWhere != ''

set @strSQL =
"select top " + str(@PageSize) +" "+@strGetFields+
" from [" + @tblName +
"] where " + @strWhere +
" " + @strOrder

else

set @strSQL =
"select top " + str(@PageSize) +" "+@strGetFields+
" from ["+ @tblName +
"] "+ @strOrder

--如果是第一页就执行以上代码，这样会加快执行速度

end

else

begin

--以下代码赋予了@strSQL以真正执行的SQL代码

set @strSQL =
"select top " + str(@PageSize) +" "+@strGetFields+
" from ["

+ @tblName + "] where [" + @fldName +
"]" + @strTmp +
"(["+ @fldName +
"]) from (select top " + str((@PageIndex-1)*@PageSize) +
" ["+ @fldName +
"] from [" + @tblName +
"]" + @strOrder +
") as tblTmp)"+ @strOrder

if @strWhere != ''

set @strSQL =
"select top " + str(@PageSize) +" "+@strGetFields+
" from ["

+ @tblName + "] where [" + @fldName +
"]" + @strTmp +
"(["

+ @fldName + "]) from (select top " + str((@PageIndex-1)*@PageSize) +
" ["

+ @fldName + "] from [" + @tblName +
"] where " + @strWhere +
" "

+ @strOrder + ") as tblTmp) and " + @strWhere +
" " + @strOrder

end

end

exec (@strSQL)

GO

调用的程序
private static DataSet GetCustomersData(string tblName, string strGetFields,string fldName,
int PageSize,
int PageIndex,
int doCount,
int OrderType, string strWhere)

{
string connString = ConfigurationSettings.AppSettings["connstr"];

SqlConnection conn = new SqlConnection(connString);

SqlCommand comm = new SqlCommand("pagination3", conn);

comm.Parameters.Add(new SqlParameter("@tblName", SqlDbType.VarChar));//表名

comm.Parameters[0].Value =tblName ;
comm.Parameters.Add(new SqlParameter("@strGetFields", SqlDbType.VarChar));//返回的列

comm.Parameters[1].Value = strGetFields;
comm.Parameters.Add(new SqlParameter("@fldName", SqlDbType.VarChar));//排序的字段名

comm.Parameters[2].Value = fldName;
comm.Parameters.Add(new SqlParameter("@PageSize",SqlDbType.Int));//页尺寸

comm.Parameters[3].Value = PageSize;
comm.Parameters.Add(new SqlParameter("@PageIndex", SqlDbType.Int));//页码

comm.Parameters[4].Value = PageIndex;
comm.Parameters.Add(new SqlParameter("@doCount", SqlDbType.Int));//是否返回记录总数，0为不返回，1为返回

comm.Parameters[5].Value = doCount;
comm.Parameters.Add(new SqlParameter("@OrderType", SqlDbType.Int));//设置排序类型，0为升序，非0为降序

comm.Parameters[6].Value = OrderType;
comm.Parameters.Add(new SqlParameter("@strWhere", SqlDbType.VarChar));//where语句

comm.Parameters[7].Value = strWhere;
comm.CommandType = CommandType.StoredProcedure;
SqlDataAdapter dataAdapter = new SqlDataAdapter(comm);

DataSet ds = new DataSet();
dataAdapter.Fill(ds);
return ds;

}

存储过程2

CREATE
PROCEDURE [dbo].[GetRecordFromPage]

@SelectList VARCHAR(2000),
--欲选择字段列表
@TableSource VARCHAR(100),
--表名或视图表
@SearchCondition VARCHAR(2000),
--查询条件
@OrderExpression VARCHAR(1000),
--排序表达式
@PageIndex INT = 1,
--页号,从0开始
@PageSize INT = 10
--页尺寸
AS

BEGIN

IF @SelectList IS
NULL
OR LTRIM(RTRIM(@SelectList)) =
''

BEGIN

SET @SelectList =
'*'

END

PRINT @SelectList

SET @SearchCondition =
ISNULL(@SearchCondition,'')

SET @SearchCondition = LTRIM(RTRIM(@SearchCondition))

IF @SearchCondition <> ''

BEGIN

IF UPPER(SUBSTRING(@SearchCondition,1,5)) <>
'WHERE'

BEGIN

SET @SearchCondition =
'WHERE ' + @SearchCondition

END

END

PRINT @SearchCondition

SET @OrderExpression =
ISNULL(@OrderExpression,'')

SET @OrderExpression = LTRIM(RTRIM(@OrderExpression))

IF @OrderExpression <> ''

BEGIN

IF UPPER(SUBSTRING(@OrderExpression,1,5)) <>
'WHERE'

BEGIN

SET @OrderExpression =
'ORDER BY ' + @OrderExpression

END

END

PRINT @OrderExpression

IF @PageIndex IS
NULL
OR @PageIndex < 1

BEGIN

SET @PageIndex = 1

END

PRINT @PageIndex
IF @PageSize IS
NULL
OR @PageSize < 1

BEGIN

SET @PageSize = 10

END

PRINT @PageSize

DECLARE @SqlQuery
VARCHAR(4000)

SET @SqlQuery='SELECT '+@SelectList+',RowNumber

FROM

(SELECT
' + @SelectList + ',ROW_NUMBER() OVER(
'+ @OrderExpression +')
AS RowNumber

FROM
'+@TableSource+'
'+ @SearchCondition +')
AS RowNumberTableSource

WHERE RowNumber
BETWEEN ' +
CAST(((@PageIndex - 1)* @PageSize+1)
AS
VARCHAR)

+ ' AND ' +

CAST((@PageIndex * @PageSize)
AS
VARCHAR)

-- ORDER BY ' + @OrderExpression

PRINT @SqlQuery
SET NOCOUNT
ON

EXECUTE(@SqlQuery)

SET NOCOUNT
OFF

RETURN @@RowCount

END

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