我有几个存储过程读取同一个表并以相同的布局返回数据。其中一个存储过程导致在存储为位的字段上发生无效的强制转换异常。 SqlDataReader认为它是int32。
样本表
create table dbo.SampleTable
(
Id INT NOT NULL IDENTITY(1,1),
SomeText VARCHAR(40),
BoolValue BIT
)
示例存储过程
create proc SampleProcedure
as
select Id,
SomeText,
BoolValue
go
示例扩展类
using System;
using System.Data.SqlClient;
namespace SampleApp.Extensions{
public static class SampleModelExtension{
private const int INDEX_ID = 0;
private const int INDEX_SOMETEXT = 1;
private const int INDEX_BOOLVALUE = 2;
public static SampleModel ToSampleModel(this SqlDataReader rdr){
SampleModel myModel = new SampleModel();
myModel.Id = !rdr.IsDbNull(INDEX_ID) ? rdr.GetInt32(INDEX_ID) : 0;
myModel.SomeText = !rdr.IsDbNull(INDEX_SOMETEXT) ? rdr.GetString(INDEX_SOMETEXT) : String.Empty;
myModel.Boolvalue = !rdr.IsDbNull(INDEX_BOOLVALUE) ? rdr.GetBool(INDEX_BOOLVALUE) : false;
return myModel;
}
}
}
示例存储库类
using SampleApp.Extensions;
using System;
using System.Collections.Generic;
using System.Data.SqlCient;
namespace SampleApp {
public SampleRepository : BaseDataConnection {
public List<SampleModel> GetSampleData(){
SqlCommand cmd = new SqlCommand("SampleProcedure", base.Connection);
List<SampleModel> retVal = new List<SampleModel>();
using(SqlDataReader rdr = base.GetDataReader(cmd)){
while(rdr.Read()){
retVal.Add(rdr.ToSampleModel());
}
}
return retVal;
}
public List<SampleModel> GetMoreSampleData(){
SqlCommand cmd = new SqlCommand("AnotherSampleProcedure", base.Connection);
List<SampleModel> retVal = new List<SampleModel>();
using(SqlDataReader rdr = base.GetDataReader(cmd)){
while(rdr.Read()){
retVal.Add(rdr.ToSampleModel());
}
}
return retVal;
}
}
}
这与我的设置类似。在我的代码中，我有一个扩展方法，它将SqlDataReader转换为SampleModel的类型，以便在存储库类的所有加载方法中重用该扩展方法。正是由于这种方法，我知道它正在使用所有其他方法。
关于为什么它会将列视为int而不是一点点的任何想法？
实际存储过程
ALTER PROCEDURE [dbo].[GetAllActiveScheduledEventsByDateRange]
@SiteGuid VARCHAR(38),
@StartDate DATE,
@EndDate DATE
AS
SELECT se.EventId,
se.AvailableDate,
se.StartTime,
se.NumberOfPatrons,
se.AgeOfPatrons,
se.ContactEmailAddress,
se.ContactPhone,
se.ContactName,
se.EventTypeId,
se.PartyName,
se.ConfirmationDateTime,
se.ReminderDateTime,
se.UserComments,
se.AdminComments,
se.Active,
se.CheckInTime,
se.CheckOutTime,
se.GunSize,
(
Select Count(p.playerid) from
(select * from waiver2 where waiverid in (
(Select WaiverId
from Waiver2
inner join
(
Select max(CreateDateTime) as LatestDate, PlayerId
from Waiver2
WHERE siteguid = @SiteGuid
Group by PlayerId
) SubMax
on Waiver2.CreateDateTime = SubMax.LatestDate
and Waiver2.PlayerId = SubMax.PlayerId))) w,
player p, PlayDateTime updt
where p.playerid = w.playerid
and p.playerid = updt.PlayerId
and updt.EventId = se.EventId) AS WaiverCount,
se.DepositAmount,
se.CreateDateTime,
se.PaymentReminderDateTime,
se.PaymentStatusId,
se.PackageId
FROM ScheduledEvent se
WHERE se.SiteGuid = @SiteGuid
AND se.AvailableDate BETWEEN @StartDate AND @EndDate
AND se.PaymentStatusId < '99'
AND se.Active = 1
ORDER BY se.StartTime, se.ContactName
Active列是抛出错误的列。它被定义为BIT并被索引为第14列。
导致问题的实际存储过程
ALTER proc [dbo].[W2_GetAllActiveScheduledEventsByDateWithWaivers]
@SiteGuid VARCHAR(38),
@AvailableDate DATE
AS
SELECT se.EventId,
se.AvailableDate,
se.StartTime,
se.NumberOfPatrons,
se.AgeOfPatrons,
se.ContactEmailAddress,
se.ContactPhone,
se.ContactName,
se.EventTypeId,
se.PartyName,
se.ConfirmationDateTime,
se.ReminderDateTime,
se.UserComments,
se.AdminComments,
se.Active,
se.CheckInTime,
se.CheckOutTime,
se.GunSize,
(
Select Count(p.playerid) from
(
select * from waiver2 where waiverid in
(
(
Select WaiverId
from Waiver2
inner join
(
Select max(CreateDateTime) as LatestDate, PlayerId
from Waiver2
WHERE siteguid = @SiteGuid
Group by PlayerId
) SubMax
on Waiver2.CreateDateTime = SubMax.LatestDate
and Waiver2.PlayerId = SubMax.PlayerId
and DateDiff(year,Waiver2.CreateDateTime,GETDATE()) = 0
)
)
) w,
player p, PlayDateTime updt
where p.playerid = w.playerid
and p.playerid = updt.PlayerId
and updt.EventId = se.EventId
and ((
FLOOR(DATEDIFF(day,p.DateOfBirth,GETDATE())/365.242199) >= 18
and
w.ParentId is null
)
or
(
FLOOR(DATEDIFF(day,p.DateOfBirth,GETDATE())/365.242199) < 18
and
w.ParentId is not null
))
) AS WaiverCount,
se.DepositAmount,
se.CreateDateTime,
se.PaymentReminderDateTime,
se.PaymentStatusId,
se.PackageId
FROM ScheduledEvent se
WHERE se.SiteGuid = @SiteGuid
AND se.AvailableDate = @AvailableDate
AND se.PaymentStatusId <= '90'
AND se.Active = 1
--ORDER BY se.StartTime, se.ContactName
union select null,
pdt.PlayDate,
pdt.PlayTime,
null,
null,
null,
null,
null,
null,
'Walk-up Players',
null,
null,
null,
null,
1,
null,
null,
null,
COUNT('x') AS WaiverCount,
0,
null,
null,
null,
null
from PlayDateTime pdt
where pdt.PlayDate = @AvailableDate
and pdt.EventId is null
and pdt.PlayerId in (
Select p.playerid from
(select * from waiver2 where waiverid in (
(Select WaiverId
from Waiver2
inner join
(
Select max(CreateDateTime) as LatestDate, PlayerId
from Waiver2
WHERE siteguid = @SiteGuid
Group by PlayerId
) SubMax
on Waiver2.CreateDateTime = SubMax.LatestDate
and Waiver2.PlayerId = SubMax.PlayerId
and DateDiff(year,Waiver2.CreateDateTime,GETDATE()) = 0))) w,
player p
where p.playerid = w.playerid
and ((
FLOOR(DATEDIFF(day,p.DateOfBirth,GETDATE())/365.242199) >= 18
and
w.ParentId is null
)
or
(
FLOOR(DATEDIFF(day,p.DateOfBirth,GETDATE())/365.242199) < 18
and
w.ParentId is not null
))
)
group by pdt.PlayDate, pdt.PlayTime
order by 2, 3, 10
这是实际的扩展类（更改名称以保护无辜者）
namespace MyNameSpace.Svc.Core.Extensions.Registration {
public static class ScheduledEventExtension {
#region attributes
private const int INDEX_ID = 0;
private const int INDEX_DATE = 1;
private const int INDEX_STARTTIME = 2;
private const int INDEX_NUMBEROFPATRONS = 3;
private const int INDEX_AGEOFPATRONS = 4;
private const int INDEX_CONTACTEMAIL = 5;
private const int INDEX_CONTACTPHONE = 6;
private const int INDEX_CONTACTNAME = 7;
private const int INDEX_EVENTTYPE = 8;
private const int INDEX_PARTYNAME = 9;
private const int INDEX_CONFIRMDATE = 10;
private const int INDEX_REMINDDATE = 11;
private const int INDEX_USERCOMMENTS = 12;
private const int INDEX_ADMINCOMMENTS = 13;
private const int INDEX_ACTIVE = 14;
private const int INDEX_CHECKINTIME = 15;
private const int INDEX_CHECKOUTTIME = 16;
private const int INDEX_GUNSIZE = 17;
private const int INDEX_WAIVERCOUNT = 18;
private const int INDEX_DEPOSITAMOUNT = 19;
private const int INDEX_CREATEDATETIME = 20;
private const int INDEX_PAYMENTREMINDERDATETIME = 21;
private const int INDEX_PAYMENTSTATUS = 22;
private const int INDEX_PACKAGEID = 23;
#endregion
#region methods
public static ScheduledEvent ToScheduledEvent(this SqlDataReader rdr) {
ScheduledEvent retVal = new ScheduledEvent();
retVal.Id = !rdr.IsDBNull(INDEX_ID) ? rdr.GetInt32(INDEX_ID) : 0;
retVal.SelectedDate.SelectedDate = !rdr.IsDBNull(INDEX_DATE) ? rdr.GetDateTime(INDEX_DATE) : DateTime.MinValue;
retVal.SelectedDate.StartTime = !rdr.IsDBNull(INDEX_STARTTIME) ? rdr.GetTimeSpan(INDEX_STARTTIME) : TimeSpan.MinValue;
int numOfPatrons = 0;
int.TryParse(rdr.GetString(INDEX_NUMBEROFPATRONS), out numOfPatrons);
retVal.NumberOfPatrons = numOfPatrons;
retVal.AgeOfPatrons = !rdr.IsDBNull(INDEX_AGEOFPATRONS) ? rdr.GetString(INDEX_AGEOFPATRONS) : string.Empty;
retVal.ContactEmailAddress = !rdr.IsDBNull(INDEX_CONTACTEMAIL) ? rdr.GetString(INDEX_CONTACTEMAIL) : string.Empty;
retVal.ContactPhone = !rdr.IsDBNull(INDEX_CONTACTPHONE) ? rdr.GetString(INDEX_CONTACTPHONE) : string.Empty;
retVal.ContactName = !rdr.IsDBNull(INDEX_CONTACTNAME) ? rdr.GetString(INDEX_CONTACTNAME) : string.Empty;
// event type is obsolete
retVal.PartyName = !rdr.IsDBNull(INDEX_PARTYNAME) ? rdr.GetString(INDEX_PARTYNAME) : string.Empty;
retVal.ConfirmationDateTime = !rdr.IsDBNull(INDEX_CONFIRMDATE) ? rdr.GetDateTime(INDEX_CONFIRMDATE) : DateTime.MinValue;
retVal.ReminderDateTime = !rdr.IsDBNull(INDEX_REMINDDATE) ? rdr.GetDateTime(INDEX_REMINDDATE) : DateTime.MinValue;
retVal.Comments = !rdr.IsDBNull(INDEX_USERCOMMENTS) ? rdr.GetString(INDEX_USERCOMMENTS) : string.Empty;
retVal.AdminComments = !rdr.IsDBNull(INDEX_ADMINCOMMENTS) ? rdr.GetString(INDEX_ADMINCOMMENTS) : string.Empty;
retVal.Active = !rdr.IsDBNull(INDEX_ACTIVE) ? rdr.GetBoolean(INDEX_ACTIVE) : false;
retVal.CheckInDateTime = !rdr.IsDBNull(INDEX_CHECKINTIME) ? rdr.GetDateTime(INDEX_CHECKINTIME) : DateTime.MinValue;
retVal.CheckOoutDateTime = !rdr.IsDBNull(INDEX_CHECKOUTTIME) ? rdr.GetDateTime(INDEX_CHECKOUTTIME) : DateTime.MinValue;
// gun size is obsolete
retVal.WaiverCount = !rdr.IsDBNull(INDEX_WAIVERCOUNT) ? rdr.GetInt32(INDEX_WAIVERCOUNT) : 0;
retVal.DepositAmount = !rdr.IsDBNull(INDEX_DEPOSITAMOUNT) ? rdr.GetDecimal(INDEX_DEPOSITAMOUNT) : 0;
retVal.CreateDateTime = !rdr.IsDBNull(INDEX_CREATEDATETIME) ? rdr.GetDateTime(INDEX_CREATEDATETIME) : DateTime.MinValue;
retVal.PaymentReminderDateTime = !rdr.IsDBNull(INDEX_PAYMENTREMINDERDATETIME) ? rdr.GetDateTime(INDEX_PAYMENTREMINDERDATETIME) : DateTime.MinValue;
retVal.PaymentStatus = !rdr.IsDBNull(INDEX_PAYMENTSTATUS) ? PaymentStatusExtension.ToPaymentStatusEnum(rdr.GetString(INDEX_PAYMENTSTATUS)) : PaymentStatusEnum.Unpaid;
retVal.SelectedPackage.Id = !rdr.IsDBNull(INDEX_PACKAGEID) ? rdr.GetInt32(INDEX_PACKAGEID) : 0;
return retVal;
}
#endregion
}
}
这是我的存储库类（再次稍作修改）
using MyNameSpace.Svc.Core.Extensions;
using MyNameSpace.Svc.Core.Extensions.Registration;
using MyNameSpace.Svc.Core.Interfaces.Registration;
using MyNameSpace.Svc.Core.Models.Registration;
using System;
using System.Collections.Generic;
using System.Data.SqlClient;
namespace MyNameSpace.Svc.Impl.Repositories.Registration {
public class ScheduledEventRepositoryImpl : DatabaseConnection, IScheduledEventRepository {
#region attributes
private const string PARMNAME_RETURN = "retval";
private const string PARMNAME_ID = "EventId";
private const string PARMNAME_GUID = "SiteGuid";
private const string PARMNAME_AVAILABLEDATE = "AvailableDate";
private const string PARMNAME_STARTTIME = "StartTime";
private const string PARMNAME_NUMPATRONS = "NumberOfPatrons";
private const string PARMNAME_AGEPATRONS = "AgeOfPatrons";
private const string PARMNAME_CONTACTEMAIL = "ContactEmailAddress";
private const string PARMNAME_CONTACTPHONE = "ContactPhone";
private const string PARMNAME_CONTACTNAME = "ContactName";
private const string PARMNAME_PARTYNAME = "PartyName";
private const string PARMNAME_CONFDATE = "ConfirmationDateTime";
private const string PARMNAME_REMINDDATE = "ReminderDateTime";
private const string PARMNAME_USERCOMMENTS = "UserComments";
private const string PARMNAME_ADMINCOMMENTS = "AdminComments";
private const string PARMNAME_CHECKINTIME = "CheckInTime";
private const string PARMNAME_CHECKOUTTIME = "CheckOutTime";
private const string PARMNAME_DEPOSITAMT = "DepositAmount";
private const string PARMNAME_CREATEDATE = "CreateDateTime";
private const string PARMNAME_PAYMENTREMINDDATE = "PaymentReminderDateTime";
private const string PARMNAME_PAYMENTSTATUS = "PaymentStatusId";
private const string PARMNAME_PKGID = "PackageId";
private const string PARMNAME_EMAIL = "EmailAddress";
private const string PARMNAME_DAYSOUT = "DaysOut";
private const string PARMNAME_EVENTTYPE = "EventTypeId";
private const string PARMNAME_STARTDATE = "StartDate";
private const string PARMNAME_ENDDATE = "EndDate";
private const string SPNAME_GETALLACTIVEBYDATERANGE = "GetAllActiveScheduledEventsByDateRange";
private const string SPNAME_GETALLACTIVEBYDATEWITHWAIVERS = "W2_GetAllActiveScheduledEventsByDateWithWaivers";
#endregion
#region methods
public List<ScheduledEvent> GetAllActiveScheduledEventsByDateRange(Guid siteGuid, DateTime startDate, DateTime endDate) {
List<ScheduledEvent> retVal = new List<ScheduledEvent>();
SqlCommand cmd = new SqlCommand(SPNAME_GETALLACTIVEBYDATERANGE, base.Connection);
cmd.Parameters.AddWithValue(PARMNAME_GUID, siteGuid.ToFormattedString());
cmd.Parameters.AddWithValue(PARMNAME_STARTDATE, startDate);
cmd.Parameters.AddWithValue(PARMNAME_ENDDATE, endDate);
using(SqlDataReader rdr = base.GetDataReader(cmd)) {
while(rdr.Read()) {
retVal.Add(rdr.ToScheduledEvent());
}
}
return retVal;
}
public List<ScheduledEvent> GetAllActiveScheduledEventsByDateWithWaivers(Guid siteGuid, DateTime availableDate) {
List<ScheduledEvent> retVal = new List<ScheduledEvent>();
using(SqlDataReader rdr = base.GetDataReader(SPNAME_GETALLACTIVEBYDATEWITHWAIVERS, PARMNAME_AVAILABLEDATE, availableDate, siteGuid)) {
while(rdr.Read()) {
retVal.Add(rdr.ToScheduledEvent());
}
}
return retVal;
}
#endregion
}
}
答案 0 :(得分：11)
高度怀疑＆＃34; SqlDataReader认为它是int32＆＃34;。 SqlDataReader只知道每个字段是什么，因为RDBMS发送结果集的模式以及结果集。因此该列（或更准确地说：结果集中的该字段） 是int。
在最初的3个代码示例中（标记为＆＃34;实际＆＃34;），存储过程与名称或参数中的存储库类调用的proc不匹配。
现在代码示例已更新，真正的proc（如问题评论中所述）有一个UNION，其中同一列的文字1被选中。文字1的默认类型为INT，因此BIT字段由INT隐式投放到UNION中。
如果你想看到这一点，请尝试以下方法（通过SQL Server 2012中引入的sys.dm_exec_describe_first_result_set查看结果集的模式）：
SELECT [system_type_name]
FROM sys.dm_exec_describe_first_result_set('SELECT CONVERT(BIT, 1) AS [BITorINT?]',
NULL, NULL);
-- bit
SELECT [system_type_name]
FROM sys.dm_exec_describe_first_result_set('SELECT 1 AS [BITorINT?]', NULL, NULL);
-- int
SELECT [system_type_name]
FROM sys.dm_exec_describe_first_result_set('SELECT CONVERT(BIT, 1) AS [BITorINT?]
UNION ALL
SELECT 1', NULL, NULL);
-- int
下次提示：
答案 1 :(得分：0)
内部sql server将位值转换为tiny int，因此union会尝试评估并确定这两个值现在是这个数据类型。
1和null将导致最有可能的int数据类型