C# 实体框架存储过程表值参数
我试图调用一个接受表值参数的存储过程。我知道实体框架还不直接支持这一点,但据我所知,您可以使用C# 实体框架存储过程表值参数,c#,entity-framework,stored-procedures,ef-code-first,table-valued-parameters,C#,Entity Framework,Stored Procedures,Ef Code First,Table Valued Parameters,我试图调用一个接受表值参数的存储过程。我知道实体框架还不直接支持这一点,但据我所知,您可以使用ObjectContext下的ExecuteStoreQuery命令来实现这一点。我有一个通用实体框架存储库,其中我有以下ExecuteStoredProcedure方法: public IEnumerable<T> ExecuteStoredProcedure<T>(string procedureName, params object[] parameters) {
ObjectContext
下的ExecuteStoreQuery
命令来实现这一点。我有一个通用实体框架存储库,其中我有以下ExecuteStoredProcedure
方法:
public IEnumerable<T> ExecuteStoredProcedure<T>(string procedureName, params object[] parameters)
{
StringBuilder command = new StringBuilder();
command.Append("EXEC ");
command.Append(procedureName);
command.Append(" ");
// Add a placeholder for each parameter passed in
for (int i = 0; i < parameters.Length; i++)
{
if (i > 0)
command.Append(",");
command.Append("{" + i + "}");
}
return this.context.ExecuteStoreQuery<T>(command.ToString(), parameters);
}
我尝试在一个接受表值参数的存储过程上运行此方法,但它会中断。我了解到参数需要是SqlParameter
类型,表值参数需要将SqlDbType
设置为Structured
。所以我这样做了,我得到了一个错误声明:
The table type parameter p6 must have a valid type name
因此,我将SqlParameter.TypeName设置为我在数据库上创建的用户定义类型的名称,然后当我运行查询时,我得到以下真正有用的错误:
Incorrect syntax near '0'.
如果我返回ADO.NET并执行数据读取器,我可以运行查询,但我希望使用数据上下文使其工作
是否有方法使用
ExecuteStoreQuery
传递表值参数?此外,我实际上首先使用实体框架代码,并将DbContext
转换为ObjectContext
,以获得可用的ExecuteStoreQuery
方法。这是必要的还是可以针对DbContext
执行此操作?更改字符串连接代码以生成类似以下内容:
EXEC someStoredProcedureName @p0,@p1,@p2,@p3,@p4,@p5,@p6,@p7
更新 我已经在Nuget软件包上添加了对此的支持-(EF4、EF5、EF6) 查看存储库中的代码示例
这个问题有点离题,但对于试图将用户定义的表传递到存储过程中的人来说仍然很有用。在研究了Nick的示例和其他Stackoverflow帖子后,我得出了以下结论:
class Program
{
static void Main(string[] args)
{
var entities = new NewBusinessEntities();
var dt = new DataTable();
dt.Columns.Add("WarningCode");
dt.Columns.Add("StatusID");
dt.Columns.Add("DecisionID");
dt.Columns.Add("Criticality");
dt.Rows.Add("EO01", 9, 4, 0);
dt.Rows.Add("EO00", 9, 4, 0);
dt.Rows.Add("EO02", 9, 4, 0);
var caseId = new SqlParameter("caseid", SqlDbType.Int);
caseId.Value = 1;
var userId = new SqlParameter("userid", SqlDbType.UniqueIdentifier);
userId.Value = Guid.Parse("846454D9-DE72-4EF4-ABE2-16EC3710EA0F");
var warnings = new SqlParameter("warnings", SqlDbType.Structured);
warnings.Value= dt;
warnings.TypeName = "dbo.udt_Warnings";
entities.ExecuteStoredProcedure("usp_RaiseWarnings_rs", userId, warnings, caseId);
}
}
public static class ObjectContextExt
{
public static void ExecuteStoredProcedure(this ObjectContext context, string storedProcName, params object[] parameters)
{
string command = "EXEC " + storedProcName + " @caseid, @userid, @warnings";
context.ExecuteStoreCommand(command, parameters);
}
}
存储过程如下所示:
EXEC someStoredProcedureName {0},{1},{2},{3},{4},{5},{6},{7}
ALTER PROCEDURE [dbo].[usp_RaiseWarnings_rs]
(@CaseID int,
@UserID uniqueidentifier = '846454D9-DE72-4EF4-ABE2-16EC3710EA0F', --Admin
@Warnings dbo.udt_Warnings READONLY
)
AS
CREATE TYPE [dbo].[udt_Warnings] AS TABLE(
[WarningCode] [nvarchar](5) NULL,
[StatusID] [int] NULL,
[DecisionID] [int] NULL,
[Criticality] [int] NULL DEFAULT ((0))
)
用户定义的表如下所示:
EXEC someStoredProcedureName {0},{1},{2},{3},{4},{5},{6},{7}
ALTER PROCEDURE [dbo].[usp_RaiseWarnings_rs]
(@CaseID int,
@UserID uniqueidentifier = '846454D9-DE72-4EF4-ABE2-16EC3710EA0F', --Admin
@Warnings dbo.udt_Warnings READONLY
)
AS
CREATE TYPE [dbo].[udt_Warnings] AS TABLE(
[WarningCode] [nvarchar](5) NULL,
[StatusID] [int] NULL,
[DecisionID] [int] NULL,
[Criticality] [int] NULL DEFAULT ((0))
)
我发现的制约因素包括:
ExecuteStoreCommand
的参数必须与存储过程中的参数顺序一致我想分享我对这个问题的解决方案: 我有几个带有表值参数的存储过程,我发现如果您这样调用它:
var query = dbContext.ExecuteStoreQuery<T>(@"
EXECUTE [dbo].[StoredProcedure] @SomeParameter, @TableValueParameter1, @TableValueParameter2", spParameters[0], spParameters[1], spParameters[2]);
var list = query.ToList();
var query=dbContext.ExecuteStoreQuery(@”
执行[dbo]。[StoredProcess]@SomeParameter、@TableValueParameter1、@TableValueParameter2”、spParameters[0]、spParameters[1]、spParameters[2]);
var list=query.ToList();
你会得到一个没有记录的列表
但我玩得更多,这句话给了我一个想法:
var query = dbContext.ExecuteStoreQuery<T>(@"
EXECUTE [dbo].[StoredProcedure] 'SomeParameterValue', @TableValueParameter1, @TableValueParameter2", spParameters[1], spParameters[2]);
var list = query.ToList();
var query=dbContext.ExecuteStoreQuery(@”
执行[dbo]。[StoredProcess]“SomeParameterValue”、@TableValueParameter1、@TableValueParameter2”、spParameters[1]、spParameters[2]);
var list=query.ToList();
我用命令文本中的实际值'SomeParameterValue'更改了参数@SomeParameter。
它成功了:)
这意味着,如果我们的参数中除了SqlDbType.Structured之外还有其他内容,它就不能正确地传递它们,我们将一无所获。
我们需要将实际参数替换为它们的值
因此,我的解决方案如下所示:
public static List<T> ExecuteStoredProcedure<T>(this ObjectContext dbContext, string storedProcedureName, params SqlParameter[] parameters)
{
var spSignature = new StringBuilder();
object[] spParameters;
bool hasTableVariables = parameters.Any(p => p.SqlDbType == SqlDbType.Structured);
spSignature.AppendFormat("EXECUTE {0}", storedProcedureName);
var length = parameters.Count() - 1;
if (hasTableVariables)
{
var tableValueParameters = new List<SqlParameter>();
for (int i = 0; i < parameters.Count(); i++)
{
switch (parameters[i].SqlDbType)
{
case SqlDbType.Structured:
spSignature.AppendFormat(" @{0}", parameters[i].ParameterName);
tableValueParameters.Add(parameters[i]);
break;
case SqlDbType.VarChar:
case SqlDbType.Char:
case SqlDbType.Text:
case SqlDbType.NVarChar:
case SqlDbType.NChar:
case SqlDbType.NText:
case SqlDbType.Xml:
case SqlDbType.UniqueIdentifier:
case SqlDbType.Time:
case SqlDbType.Date:
case SqlDbType.DateTime:
case SqlDbType.DateTime2:
case SqlDbType.DateTimeOffset:
case SqlDbType.SmallDateTime:
// TODO: some magic here to avoid SQL injections
spSignature.AppendFormat(" '{0}'", parameters[i].Value.ToString());
break;
default:
spSignature.AppendFormat(" {0}", parameters[i].Value.ToString());
break;
}
if (i != length) spSignature.Append(",");
}
spParameters = tableValueParameters.Cast<object>().ToArray();
}
else
{
for (int i = 0; i < parameters.Count(); i++)
{
spSignature.AppendFormat(" @{0}", parameters[i].ParameterName);
if (i != length) spSignature.Append(",");
}
spParameters = parameters.Cast<object>().ToArray();
}
var query = dbContext.ExecuteStoreQuery<T>(spSignature.ToString(), spParameters);
var list = query.ToList();
return list;
}
公共静态列表ExecuteStoreProcedure(此ObjectContext dbContext、string storedProcedureName、params SqlParameter[]参数)
{
var spSignature=新StringBuilder();
对象参数;
bool hasTableVariables=parameters.Any(p=>p.SqlDbType==SqlDbType.Structured);
AppendFormat(“执行{0}”,storedProcedureName);
var length=parameters.Count()-1;
if(hasTableVariables)
{
var tableValueParameters=新列表();
对于(int i=0;i
代码当然可以更优化,但我希望这会有所帮助。数据表方法是唯一的方法,但是构建数据表并手动填充它是很麻烦的。我想直接从m定义我的数据表
go
create procedure GenerateInvoice
@listIds GuidList readonly,
@createdBy uniqueidentifier,
@success int out,
@errorMessage nvarchar(max) out
as
begin
set nocount on;
begin try
begin tran;
--
-- Your logic goes here, let's say a cursor or something:
--
-- declare gInvoiceCursor cursor forward_only read_only for
--
-- bla bla bla
--
-- if (@brokenRecords > 0)
-- begin
-- RAISERROR(@message,16,1);
-- end
--
-- All good!
-- Bonne chance mon ami!
select @success = 1
select @errorMessage = ''
end try
begin catch
--if something happens let's be notified
if @@trancount > 0
begin
rollback tran;
end
declare @errmsg nvarchar(max)
set @errmsg =
(select 'ErrorNumber: ' + cast(error_number() as nvarchar(50))+
'ErrorSeverity: ' + cast(error_severity() as nvarchar(50))+
'ErrorState: ' + cast(error_state() as nvarchar(50))+
'ErrorProcedure: ' + cast(error_procedure() as nvarchar(50))+
'ErrorLine: ' + cast(error_number() as nvarchar(50))+
'error_message: ' + cast(error_message() as nvarchar(4000))
)
--save it if needed
print @errmsg
select @success = 0
select @errorMessage = @message
return;
end catch;
--at this point we can commit everything
if @@trancount > 0
begin
commit tran;
end
end
go
declare @p3 dbo.GuidList
insert into @p3 values('f811b88a-bfad-49d9-b9b9-6a1d1a01c1e5')
exec sp_executesql N'exec GenerateInvoice @listIds, @CreatedBy, @success',N'@listIds [dbo].[GuidList] READONLY,@CreatedBy uniqueidentifier',@listIds=@p3,@CreatedBy='FFFFFFFF-FFFF-FFFF-FFFF-FFFFFFFFFFFF'
[HttpPost]
[AuthorizeExtended(Roles = "User, Admin")]
[Route("api/BillingToDo/GenerateInvoices")]
public async Task<IHttpActionResult> GenerateInvoices(BillingToDoGenerateInvoice model)
{
try
{
using (var db = new YOUREntities())
{
//Build your record
var tableSchema = new List<SqlMetaData>(1)
{
new SqlMetaData("Id", SqlDbType.UniqueIdentifier)
}.ToArray();
//And a table as a list of those records
var table = new List<SqlDataRecord>();
for (int i = 0; i < model.elements.Count; i++)
{
var tableRow = new SqlDataRecord(tableSchema);
tableRow.SetGuid(0, model.elements[i]);
table.Add(tableRow);
}
//Parameters for your query
SqlParameter[] parameters =
{
new SqlParameter
{
SqlDbType = SqlDbType.Structured,
Direction = ParameterDirection.Input,
ParameterName = "listIds",
TypeName = "[dbo].[GuidList]", //Don't forget this one!
Value = table
},
new SqlParameter
{
SqlDbType = SqlDbType.UniqueIdentifier,
Direction = ParameterDirection.Input,
ParameterName = "createdBy",
Value = CurrentUser.Id
},
new SqlParameter
{
SqlDbType = SqlDbType.Int,
Direction = ParameterDirection.Output, // output!
ParameterName = "success"
},
new SqlParameter
{
SqlDbType = SqlDbType.NVarChar,
Size = -1, // "-1" equals "max"
Direction = ParameterDirection.Output, // output too!
ParameterName = "errorMessage"
}
};
//Do not forget to use "DoNotEnsureTransaction" because if you don't EF will start it's own transaction for your SP.
//In that case you don't need internal transaction in DB or you must detect it with @@trancount and/or XACT_STATE() and change your logic
await db.Database.ExecuteSqlCommandAsync(TransactionalBehavior.DoNotEnsureTransaction,
"exec GenerateInvoice @listIds, @createdBy, @success out, @errorMessage out", parameters);
//reading output values:
int retValue;
if (parameters[2].Value != null && Int32.TryParse(parameters[2].Value.ToString(), out retValue))
{
if (retValue == 1)
{
return Ok("Invoice generated successfully");
}
}
string retErrorMessage = parameters[3].Value?.ToString();
return BadRequest(String.IsNullOrEmpty(retErrorMessage) ? "Invoice was not generated" : retErrorMessage);
}
}
catch (Exception e)
{
return BadRequest(e.Message);
}
}
}