分页存储过程及.NET代码

/*
    author:修改schema,原作tag
    description:通用分页存储过程
    date:2006/09/22
*/
ALTER PROCEDURE dbo.SPY_Page
@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, 查询表的记录总数
@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 !='SCHEMA'
            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 != 'SCHEMA' 
                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 != 'SCHEMA'
            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)
	RETURN

.NET代码

private const String m_tableName = "EnterpriseList";    //表名
        private const String m_getFields = "*";       //获取的字段
        private const String m_orderField = "AddDate";//默认排序字段
        private const Boolean m_doCount = false;      //不统计总记录数
        private const Boolean m_orderType = true;    //降序
        private const String m_strWhere = "SCHEMA";

 #region SPY_EnterpriseList_get_bysql
        /// 

        /// 根据条件来访列表,分页
        /// 
        /// 每页记录数
        /// 页索引
        /// 条件语句
        /// 返回eventdirOR的集合
        public List SPY_EnterpriseList_get_bysql(Int32 pageSize, Int32 pageIndex, String strWhere)
        {
            IDataReader dr = null;
            try
            {
                Database db = DatabaseFactory.CreateDatabase();
                Object[] paras = sql.getSqlParaToPage(m_tableName, m_getFields, m_orderField, pageSize, pageIndex, m_doCount, m_orderType, strWhere);

                dr = db.ExecuteReader("SPY_Page", paras);

                List obj = new List();
                while (dr.Read())
                {
                    obj.Add(new EnterpriseList(dr));
                }
                return obj;
            }
            catch (Exception ex)
            {
                throw new Exception(ex.Message);
            }
            finally
            {
                #region finally

                if (dr != null)
                    dr.Dispose();

                #endregion
            }
        }
        #endregion

        #region SPY_EnterpriseList_get_bysqlTocount
        /// 

        /// 根据条件来访列表,返回记录个数
        /// 
        /// 每页记录数
        /// 页索引
        /// 条件语句
        /// 返回整形值
        public Int32 SPY_EnterpriseList_get_bysqlTocount(Int32 pageSize, Int32 pageIndex, String strWhere)
        {
            IDataReader dr = null;
            try
            {
                Database db = DatabaseFactory.CreateDatabase();
                //参数中的true表示统计总个数
                Object[] paras = sql.getSqlParaToPage(m_tableName, m_getFields, m_orderField, pageSize, pageIndex, true, m_orderType, strWhere);
                dr = db.ExecuteReader("SPY_Page", paras);
                while (dr.Read())
                {
                    //返回记录总个数
                    return Convert.ToInt32(dr["Total"]);
                }
                return 0;
            }
            catch (Exception ex)
            {
                throw new Exception(ex.Message);
            }
            finally
            {
                #region finally

                if (dr != null)
                    dr.Dispose();

                #endregion
            }
        }
        #endregion