ORMBase对象/关系型数据库映射在MVC中的应用(二)
3、DataBase基类，查询方法返回值是List<T>,并且是分页的，ThePart.dll版本2.0中封装了一个PageInfo类，作为分页的类型。这种方法很机械，也很狗血..建议大家不这么用，下面这个例子是项目中同事写的。为了DataBase这个基类的操作数据库返回值各种类型，让人们知道各种情况的数据都可以处理。的这么一个目的，我还是把例子贴出来。我自己都难得去费神看。
public static
List<SportsBetRecords> SportsGetListPager(string SaleID, string UserName,
string status, string classtype, string StarTime, string EndTime, int? pSize,
int? pIndex, out int count)
{
pSize =
pSize ??
10; //每页最大记录数
pIndex = pIndex ??
1; //当前第几页
PagerInfo pager = new
PagerInfo(); //ThePart.dll中封装的这么一个分页类PagerInfo
pager.ProcName = "pr_Pager2005"; //需要的数据库的存储过程
pager.TableNames =
"SportsBetRecords"; //需要操作的数据库表名
pager.PageSize =
(int)pSize; //最大记录数
pager.CurrentPage =
(int)pIndex; //当前第几页
StringBuilder sb = new StringBuilder("1=1 and SaleID=‘" + SaleID +
"‘"); //可变字符串的条件
if
(!string.IsNullOrEmpty(UserName))
sb.Append(" and UserName=‘" + UserName +
"‘");
if
(!string.IsNullOrEmpty(StarTime) &&
!string.IsNullOrEmpty(EndTime))
sb.Append(" and [T] between ‘" + Convert.ToDateTime(StarTime) + "‘ and ‘" +
Convert.ToDateTime(EndTime).AddDays(1) +
"‘");
pager.Condition =
sb.ToString(); //sql里面where后的条件
pager.Count =
1;
pager.Fields =
"*";
pager.IndexName =
"Id";
pager.OrderNames = "[T]
desc";
List<SportsBetRecords> recordList =
ORMBase.GetList<SportsBetRecords>(ref
pager);
count =
pager.Count;
return recordList;
}
以下是相应该存储过程：
USE [Casino]
GO
/****** Object: StoredProcedure
[dbo].[pr_Pager2005] Script Date: 05/13/2014 15:05:28
******/
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
ALTER
PROCEDURE [dbo].[pr_Pager2005]
(
@TableNames VARCHAR(4000), -- 表名
@Fields
VARCHAR(1000) = ‘*‘, -- 需要返回的列(不能有相同的字段出现，如有相同字段，可把第一个外的其它字段转为别名，如：b.ID As
bID)
@Condition VARCHAR(1500) = ‘‘, --
查询条件
@IndexName VARCHAR(20) = ‘ID‘, --
主索引字段(此处作废，只为兼容)
@PageSize INT = 20, -- 每页记录数
@CurrentPage INT = 1, -- 当前页码
@OrderNames VARCHAR(50) = ‘‘, -- 排序字段，要包括排序类型
@OrderType BIT = 1, -- 排序类型,0-降序 1-升序(默认)(此处作废，只为兼容)
@Count INT=null OUTPUT ,
@Distinct VARCHAR(9)=‘‘,
--去重复记录distinct
@GroupBy VARCHAR(100)=‘‘,
@TSQL nVARCHAR(4000)=‘‘ OUTPUT
--本次执行的TSQL语句或在分页前执行的TSQL
)
AS
DECLARE @SQL
nVARCHAR(max) -- 主语句
DECLARE @OrderBy VARCHAR(300) --
排序
DECLARE @StartRow INT,@ENDRow INT
SET @SQL = ‘‘
BEGIN
SET NOCOUNT
ON
IF(@CurrentPage<1)
SET @CurrentPage = 1
SET @StartRow =
(@CurrentPage-1)*@PageSize+1
SET
@ENDRow = @CurrentPage*@PageSize
IF(@Condition != ‘‘)
SET @Condition = ‘ Where ‘ + @Condition
IF(@GroupBy!=‘‘)
SET @GroupBy = ‘ Group By ‘ +
@GroupBy
IF(@Distinct!=‘‘)
SET @Distinct = @Distinct + ‘ ‘
IF(@OrderNames = ‘‘)
SET @OrderBy = ‘‘
ELSE
SET
@OrderBy = ‘ Order By ‘ + @OrderNames
IF ((@Count is not null) And @Count > 0 )
BEGIN
IF(@GroupBy=‘‘)
SET @SQL = @TSQL + ‘ Select ‘
+@Distinct+ ‘ @c=Count(0) From ‘ + @TableNames + @Condition
ELSE
SET @SQL = @TSQL
+ ‘ Select ‘ +@Distinct+ ‘ @c=Count(0) From (Select 0 As ID From ‘ + @TableNames
+ @Condition + @GroupBy +‘) As T‘
EXEC sp_executesql @SQL,N‘@c INT OUTPUT‘,@Count
OUTPUT
END
--以下实现了带Group By和不带Group By的情况
IF(@GroupBy=‘‘)
Begin
SET @SQL
= @TSQL + ‘ With T1 As ( Select ‘ + @Distinct + @Fields + ‘,Row_Number() Over (‘
+ @OrderBy +‘) As RowNo From ‘ + @TableNames + @Condition + ‘ )
‘
SET @SQL = @SQL +
‘Select * From T1 Where RowNo Between ‘ + Cast(@StartRow As VARCHAR) + ‘ And ‘ +
Cast(@ENDRow AS VARCHAR)
END
ELSE
Begin
SET @SQL = @TSQL + ‘ With T1 As ( Select ‘ + @Distinct
+ @Fields +‘ From ‘ + @TableNames + @Condition + @GroupBy + ‘ )
‘
SET @SQL = @SQL +
‘Select * From (Select *,Row_Number() Over (‘ + @OrderBy +‘) As RowNo From T1)
As T2 Where RowNo Between ‘ + Cast(@StartRow As VARCHAR) + ‘ And ‘ +
Cast(@ENDRow As VARCHAR)
END
END
EXEC (@SQL)
4、直接返回所有List表记录：不需要查询条件和写sql语句。 实体类.GetList<实体类>(0)
public static List<BetResultInfo>
BetRInfo()
{
return
BetResultInfo.GetList<BetResultInfo>(0);
}
5、更新数据表字段的值： 实体类.Update(实体的实例对象，"需要修改的字段值")
public static int Update(W88BetRecords
item)
{
return
W88BetRecords.Update(item, "Id=" + item.Id.Value + "and
TerraceId=2");
}
6、查询出单个的值，值是个Object类型：实体类.ExecSQLObj("数据库名","完整的Sql语句",new Object[]{});
///
<summary>
///
根据等级ID查询限注值范围
///
</summary>
/// <param
name="gradeID"></param>
///
<returns></returns>
public static string GetRegardByID(int
gradeID)
{
string
sql = "select LimitValue from Regard where GradeID=" +
gradeID;
return Convert.ToString(Regard.ExecSQLObj("Casino", sql, new object[] {
}));
}