这是我的DataAccessLayer
public string GetMinISecPer(ISecuritySummmary iSecObj)
{
try
{
string miniSecPer = null;
SelectCommand cmd = new SelectCommand(SPConst.GetMinIsecPer);
cmd["@SubISUName"] = iSecObj.SubISUName;
using (DBDataReaderWrapper reader = cmd.Execute())
{
while (reader.Read())
{
double miniSecPercent = Convert.ToDouble(reader.String["testValue"]);
miniSecPer = Convert.ToString(miniSecPercent);
}
}
return miniSecPer;
}
catch (Exception e)
{
return "";
}
}
这是我的存储过程
ALTER PROCEDURE [dbo].[GetMinIsecPer]
@SubISUName varchar(max)
AS
BEGIN
DECLARE @MinIsecPer float;
DECLARE @testValue varchar(20);
set @testValue='value';
set @MinIsecPer=(select MIN(iSecComplPer) from ISecurityStatistics IST
left outer join Relationship R on R.Id=IST.RelationshipId
left outer join SubISU SI on SI.Id=R.SubISUId
where SI.SubISUName=@SubISUName and UploadedDate=(SELECT MAX(UploadedDate) FROM ISecurityStatistics))
set @testValue=(select cast(@MinIsecPer as varchar(20)))
select cast(@testValue as varchar(20))
SELECT
SQL_VARIANT_PROPERTY(@testValue, 'BaseType'),
SQL_VARIANT_PROPERTY(@testValue, 'Precision'),
SQL_VARIANT_PROPERTY(@testValue, 'Scale'),
SQL_VARIANT_PROPERTY(@testValue, 'MaxLength')
END
我的SP的输出是
(No column name)
72
(No column name) (No column name) (No column name) (No column name)
varchar 0 0 20
在此SP中,从表ISecurityStatistics获取min%,subISU和Relationship是主表,以获取作为参数传递给它的subISUName。
但是在DataAccessLayer中我得到错误"索引超出范围异常"
请帮我解决问题..提前谢谢..
答案 0 :(得分:4)
这是因为即使没有设置名称,您也试图按名称访问该值。
使用:
reader[0].ToString()
或者你可以命名专栏:
select cast(@testValue as varchar(20)) As [testValue]
然后打电话给你现在做的事。