c# - 如何使用EF执行带有输入和输出参数的存储过程？

Question

我使用的是 EF 代码优先方法，并且我使用迁移创建了存储过程，如下所示:

public override void Up()
    {
        Sql(@"CREATE TYPE IdsList AS TABLE   
                    ( 
                    Id Int
                    )
                    GO

                    Create Procedure getChildIds(
                    @IdsList dbo.IdsList ReadOnly
                    )
                    As
                    Begin
                    WITH RecursiveCTE AS
                    (
                        SELECT Id
                        FROM dbo.PhysicalObjects
                        WHERE ParentId in (Select * from @IdsList)
                        --Where Id=108
                        UNION ALL

                        SELECT t.Id
                        FROM dbo.PhysicalObjects t
                        INNER JOIN RecursiveCTE cte ON t.ParentId = cte.Id
                    )
                    SELECT * FROM RecursiveCTE
                    End");
    }

    public override void Down()
    {
        Sql(@"Drop Type IdsList
                Go
                Drop Procedure getChildIds");
    }

现在，如果我转到 sql server management studio 并执行以下脚本:

Declare @Ids dbo.IdsList

Insert into @Ids
SELECT 1

Exec getChildIds @Ids

它将成功执行，但现在我正尝试按如下方式执行该存储过程:

 var idsList = new SqlParameter {ParameterName = "idsList",  Value = new int[] { 1,2,3,4,5} };

 var idParams = new SqlParameter("idParams", SqlDbType.Structured)
            {
                Direction = System.Data.ParameterDirection.Output
            };

var results = dbContext.Database.SqlQuery<int>("getChildIds @idsList, @idParams out", idsList,idParams) ;

var idsResult = (List<int>)idParams.Value;

它不返回任何东西。

那么如何执行带有表类型输入和输出参数的存储过程呢？

Answer 1

您必须以不同的方式获取您的数据:

You cannot return data in a table-valued parameter. Table-valued parameters are input-only; the OUTPUT keyword is not supported.