浅述asp.net海量分页数据存储过程-技术开发专区

浅述asp.net海量分页数据存储过程

作者：谁伴我闯荡编辑：胡铭娅 2011-05-04 15:38 来源：cnblogs

【IT168 技术】数据分页是Web应用程序开发中经常使用的一种技术，也是提高Web数据访问性能的主要手段。本文结合ASP.NET，详细给出了两种ASP.NET海量分页数据存储的技术。

　　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（为了通用性，我写了一个方法，大家可以提意见，也可以对其进行修改，多多交换意见，共同进步）
  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：

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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