Asp.net mvc 带有输出参数的ExecuteSqlCommand
我正在ASP.NET MVC3应用程序中使用实体框架,并尝试使用以下代码:Asp.net mvc 带有输出参数的ExecuteSqlCommand,asp.net-mvc,entity-framework,asp.net-mvc-3,Asp.net Mvc,Entity Framework,Asp.net Mvc 3,我正在ASP.NET MVC3应用程序中使用实体框架,并尝试使用以下代码: var token = ""; this.Database.ExecuteSqlCommand("exec dbo.MyUsp", new SqlParameter("token", token)); 我的存储过程签名是: CREATE PROCEDURE MyUSP(@token varchar(10) OUT) (...) 当我使用这段代码时,我得到一个错误,说参数“@token”是预期的,但没有提供 如何告诉E
var token = "";
this.Database.ExecuteSqlCommand("exec dbo.MyUsp", new SqlParameter("token", token));
我的存储过程签名是:
CREATE PROCEDURE MyUSP(@token varchar(10) OUT)
(...)
当我使用这段代码时,我得到一个错误,说参数“@token”是预期的,但没有提供
如何告诉EF令牌参数用于输出?您需要在参数中指示方向。例如,尝试以下方法:
var p = new SqlParameter("token", token);
p.Direction = ParameterDirection.InputOutput;
this.Database.ExecuteSqlCommand("exec dbo.MyUsp", p);
我最终用这个来让它工作,但我相信有一个更为优化的方法:
var p = new SqlParameter
{
ParameterName = "token",
DbType = System.Data.DbType.String,
Size = 100,
Direction = System.Data.ParameterDirection.Output
};
var resp = this.Database.SqlQuery<String>("exec dbo.usp_GetRequestToken @token", p);
return resp.First();
var p=新的SqlParameter
{
ParameterName=“令牌”,
DbType=System.Data.DbType.String,
尺寸=100,
方向=System.Data.ParameterDirection.Output
};
var resp=this.Database.SqlQuery(“exec dbo.usp_GetRequestToken@token”,p);
返回resp.First();
下面是我使用DevArt驱动程序为Oracle所做的工作。我有一个名为P_SID.SID_PGet的package.proc,它返回一个字符串值。程序是:
PROCEDURE SID_PGet(io_SID OUT varchar2) is
Begin
io_SID:=GetSID; -- GetSID just goes off and gets the actual value
End;
下面是我如何调用它并检索SID值(我首先将其与EF 4.1代码一起使用,此方法在DbContext中):
//
///从数据库中获取下一个SID值
///
///X12345格式的字符串
公共字符串GetNextSId()
{
var parameter=new Devart.Data.Oracle.oracleparter(“io_SID”,Devart.Data.Oracle.OracleDbType.VarChar,ParameterDirection.Output);
this.Database.ExecuteSqlCommand(“BEGIN P_SID.SID_PGet(:io_SID);END;”,参数);
var sid=参数。值为字符串;
返回sid;
}
我用以下SQL和实体框架代码解决了这个问题
SP:
ALTER PROCEDURE [dbo].[SaveSingleColumnValueFromGrid]
(
@TableName VARCHAR(200),
@ColumnName VARCHAR (200),
@CompareField VARCHAR(200),
@CompareValue VARCHAR(200),
@NewValue VARCHAR(200),
@Result INT OUTPUT
)
AS
BEGIN
DECLARE @SqlString NVARCHAR(2000),
@id INTEGER = 0;
IF @CompareValue = ''
BEGIN
SET @SqlString = 'INSERT INTO ' + @TableName + ' ( ' + @ColumnName + ' ) VALUES ( ''' + @NewValue + ''' ) ; SELECT @id = SCOPE_IDENTITY()';
EXECUTE sp_executesql @SqlString, N'@id INTEGER OUTPUT', @id OUTPUT
END
ELSE
BEGIN
SET @SqlString = 'UPDATE ' + @TableName + ' SET ' + @ColumnName + ' = ''' + @NewValue + ''' WHERE ' + @CompareField + ' = ''' + @CompareValue + '''';
EXECUTE sp_executesql @SqlString
set @id = @@ROWCOUNT
END
SELECT @Result = @id
END
public FieldUpdateResult SaveSingleColumnValueFromGrid(string tableName, string tableSetFieldName, string updatedValue, string tableCompareFieldName, string uniqueFieldValue)
{
var fieldUpdateResult = new FieldUpdateResult() ;
var isNewRecord = false;
if (string.IsNullOrWhiteSpace(uniqueFieldValue))
{
uniqueFieldValue = string.Empty;
isNewRecord = true;
}
using (var dbContext = new DBEntities())
{
var resultParameter = new SqlParameter("@Result", SqlDbType.Int)
{
Direction = ParameterDirection.Output
};
var recordsAffected = dbContext.Database.ExecuteSqlCommand("SaveSingleColumnValueFromGrid @TableName,@ColumnName,@CompareField,@CompareValue,@NewValue,@Result out",
new SqlParameter("@TableName", tableName),
new SqlParameter("@ColumnName", tableSetFieldName),
new SqlParameter("@CompareField", tableCompareFieldName),
new SqlParameter("@CompareValue", uniqueFieldValue),
new SqlParameter("@NewValue", updatedValue),
resultParameter);
fieldUpdateResult.Success = recordsAffected > 0;
if (isNewRecord)
{
fieldUpdateResult.NewId = (int)resultParameter.Value;
}
else
{
fieldUpdateResult.AffectedRows = (int)resultParameter.Value;
}
}
return fieldUpdateResult;
}
实体框架代码:
ALTER PROCEDURE [dbo].[SaveSingleColumnValueFromGrid]
(
@TableName VARCHAR(200),
@ColumnName VARCHAR (200),
@CompareField VARCHAR(200),
@CompareValue VARCHAR(200),
@NewValue VARCHAR(200),
@Result INT OUTPUT
)
AS
BEGIN
DECLARE @SqlString NVARCHAR(2000),
@id INTEGER = 0;
IF @CompareValue = ''
BEGIN
SET @SqlString = 'INSERT INTO ' + @TableName + ' ( ' + @ColumnName + ' ) VALUES ( ''' + @NewValue + ''' ) ; SELECT @id = SCOPE_IDENTITY()';
EXECUTE sp_executesql @SqlString, N'@id INTEGER OUTPUT', @id OUTPUT
END
ELSE
BEGIN
SET @SqlString = 'UPDATE ' + @TableName + ' SET ' + @ColumnName + ' = ''' + @NewValue + ''' WHERE ' + @CompareField + ' = ''' + @CompareValue + '''';
EXECUTE sp_executesql @SqlString
set @id = @@ROWCOUNT
END
SELECT @Result = @id
END
public FieldUpdateResult SaveSingleColumnValueFromGrid(string tableName, string tableSetFieldName, string updatedValue, string tableCompareFieldName, string uniqueFieldValue)
{
var fieldUpdateResult = new FieldUpdateResult() ;
var isNewRecord = false;
if (string.IsNullOrWhiteSpace(uniqueFieldValue))
{
uniqueFieldValue = string.Empty;
isNewRecord = true;
}
using (var dbContext = new DBEntities())
{
var resultParameter = new SqlParameter("@Result", SqlDbType.Int)
{
Direction = ParameterDirection.Output
};
var recordsAffected = dbContext.Database.ExecuteSqlCommand("SaveSingleColumnValueFromGrid @TableName,@ColumnName,@CompareField,@CompareValue,@NewValue,@Result out",
new SqlParameter("@TableName", tableName),
new SqlParameter("@ColumnName", tableSetFieldName),
new SqlParameter("@CompareField", tableCompareFieldName),
new SqlParameter("@CompareValue", uniqueFieldValue),
new SqlParameter("@NewValue", updatedValue),
resultParameter);
fieldUpdateResult.Success = recordsAffected > 0;
if (isNewRecord)
{
fieldUpdateResult.NewId = (int)resultParameter.Value;
}
else
{
fieldUpdateResult.AffectedRows = (int)resultParameter.Value;
}
}
return fieldUpdateResult;
}
我看到每个人都缺少的主要部分是@Param之后需要的OUT关键字。这对我很有用。没有在文本中明确地添加“@Param1,@Param2(etc)”,它抱怨没有提供参数。如果不在命令文本中添加“OUTPUT”,它将无法返回值。谢谢若存储过程只返回输出参数,那个么我必须使用EXECUTESQLCOMAND(此处仅显示)而不是SqlQuery。
var db = new DBContext();
var outParam = new SqlParameter
{
ParameterName = "@Param",
DbType = System.Data.DbType.String,
Size = 20,
Direction = System.Data.ParameterDirection.Output
};
var r = db.Database.ExecuteSqlCommand("EXEC MyStoredProd @Param OUT",outParam );
Console.WriteLine(outParam.Value);