实体框架存储过程表值参数

Question

我正在尝试调用接受表值参数的存储过程.我知道实体框架中没有直接支持这个,但据我所知,你可以使用ExecuteStoreQuery命令off来实现ObjectContext.我有一个通用的实体框架存储库,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);
}

命令字符串最终如下:

EXEC someStoredProcedureName {0},{1},{2},{3},{4},{5},{6},{7}

我试图在接受表值参数的存储过程上运行此方法,并且它会中断.我在这里读到需要的类型SqlParameter参数和表值参数需要SqlDbType设置为Structured.所以我这样做了,我得到一个错误说明:

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'.

如果我恢复到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.

有没有办法传递表值参数ExecuteStoreQuery？此外,我实际上使用Entity Framework Code First并将其转换DbContext为an ObjectContext来获取ExecuteStoreQuery方法.这是必要的还是我可以这样做DbContext？

Answer 1

UPDATE

我在Nuget Package上添加了对此的支持 - https://github.com/Fodsuk/EntityFrameworkExtras#nuget(EF4,EF5,EF6 )

查看GitHub存储库以获取代码示例.

稍微偏离问题,但对于尝试将用户定义的表传递到存储过程的人来说,这一点毫无用处.在玩了Nick的例子和其他Stackoverflow帖子之后,我想出了这个:

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);
    }
}

并且存储过程如下所示:

ALTER PROCEDURE [dbo].[usp_RaiseWarnings_rs]
    (@CaseID int, 
     @UserID uniqueidentifier = '846454D9-DE72-4EF4-ABE2-16EC3710EA0F', --Admin
     @Warnings dbo.udt_Warnings READONLY
)
AS

用户定义的表如下所示:

CREATE TYPE [dbo].[udt_Warnings] AS TABLE(
    [WarningCode] [nvarchar](5) NULL,
    [StatusID] [int] NULL,
    [DecisionID] [int] NULL,
    [Criticality] [int] NULL DEFAULT ((0))
)

我发现的限制因素包括:

1. 您传入的参数ExecuteStoreCommand必须与存储过程中的参数保持一致
2. 您必须将每列都传递到用户定义的表中,即使它们具有默认值.所以我的UDT上似乎没有IDENTITY(1,1)NOT NULL列

Answer 2

好的,所以这是一个2018更新:端到端解决方案,它描述了如何使用来自Entity Framework的表参数调用存储过程而没有nuget包

我正在使用EF 6.xx,SQL Server 2012和VS2017

1.您的表值参数

假设你有一个像这样定义的简单表类型(只有一列)

go
create type GuidList as table (Id uniqueidentifier)

2.您的存储过程

和一个包含多个参数的存储过程:

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

3. SQL代码使用此存储过程

在SQL中你会使用类似的东西:

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'

4. C#代码使用此存储过程

以下是如何从实体框架(WebAPI内部)调用存储过程:

    [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);
        }
    }
}

我希望它有所帮助!

Answer 3

我想在这个问题上分享我的解决方案:

我有几个表值参数的存储过程,我发现如果你这样调用它:

var query = dbContext.ExecuteStoreQuery<T>(@"
EXECUTE [dbo].[StoredProcedure] @SomeParameter, @TableValueParameter1, @TableValueParameter2", spParameters[0], spParameters[1], spParameters[2]);
var list = query.ToList();

你得到一个没有记录的清单.

但我玩了更多,这条线给了我一个想法:

var query = dbContext.ExecuteStoreQuery<T>(@"
EXECUTE [dbo].[StoredProcedure] 'SomeParameterValue', @TableValueParameter1, @TableValueParameter2",  spParameters[1], spParameters[2]);
var list = query.ToList();

我在命令文本中使用其实际值'SomeParameterValue'更改了参数@SomeParameter.并且它有效:)这意味着如果我们在参数中有其他东西而不是SqlDbType.Structured,它不会正确地传递它们而我们什么也得不到.我们需要用它们的值替换实际参数.

所以,我的解决方案如下:

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;
}

代码肯定可以更优化,但我希望这会有所帮助.

Answer 4

var sqlp = new SqlParameter("@param3", my function to get datatable);
sqlp.SqlDbType = System.Data.SqlDbType.Structured;
sqlp.TypeName = "dbo.mytypename";

  var v = entitycontext.Database.SqlQuery<bool?>("exec [MyStorProc] @param1,@param2,@param3,@param4", new SqlParameter[]
                    {
                        new SqlParameter("@param1",value here),
                        new SqlParameter("@param2",value here),

                        sqlp,
                        new SqlParameter("@param4",value here)

                    }).FirstOrDefault();