Dear Sirs,
I know you’re probably tired from shaving your yak, but I’ve been doing research on this topic for a few months now with very little luck. Is there a way you can pass a list object from C# over to a stored procedure?

I was able to do something similar by using XML and multiple single arrays, but not with the entire list object. My list object contains several rows with several fields of various data types. I’m able to do this in SQL Server, but now that we are converting over to Oracle, I’m trying to find a way to accomplish this.

I'm currently using the following setup:

• Visual Studio 2017
• .NET Framework 4.6.1
• Oracle.ManagedDataAccess 18.6.0

Here’s my C# code:

public class Automobile
        {
            public string Make { get; set; }
            public string Model { get; set; }
            public int Year { get; set; }
            public string Country { get; set; }
        }

using Oracle.ManagedDataAccess.Client;
        using Oracle.ManagedDataAccess.Types;

        [WebMethod(EnableSession = true)]
        [ScriptMethod(ResponseFormat = ResponseFormat.Json)]
        public string InsertCars(List<Automobile> myCars, int userID)
        {
            DataSet dataSet = new DataSet();

            using (OracleConnection sqlConnection = new OracleConnection(OracleDBConnection))
            {
                using (OracleCommand sqlCommand = new OracleCommand("sp_InsertCars", sqlConnection))
                {
                    sqlConnection.Open();
                    sqlCommand.CommandType = CommandType.StoredProcedure;

                    sqlCommand.Parameters.Add(
                        new OracleParameter
                        {
                            CollectionType = OracleCollectionType.PLSQLAssociativeArray,
                            Direction = ParameterDirection.Input,
                            ParameterName = "p_CarList",
                            UdtTypeName = "tt_Automobile",
                            Size = myCars.Count,
                            Value = myCars.ToArray()
                        }
                    );

                    sqlCommand.Parameters.Add(
                        new OracleParameter
                        {
                            OracleDbType = OracleDbType.Int32,
                            Direction = ParameterDirection.Input,
                            ParameterName = "p_UserID",
                            Value = userID
                        }
                    );

                    sqlCommand.Parameters.Add(
                        new OracleParameter
                        {
                            OracleDbType = OracleDbType.RefCursor,
                            Direction = ParameterDirection.Output,
                            ParameterName = "o_Cursor"
                        }
                    );

                    using (OracleDataAdapter sqlAdapter = new OracleDataAdapter(sqlCommand))
                    {
                        sqlAdapter.SelectCommand = sqlCommand;
                        sqlAdapter.Fill(dataSet);
                    }
                }

                return JsonConvert.SerializeObject(dataSet);
            }
        }

Below is my Oracle code:

CREATE TABLE tblCars
        (
            RecordID INT GENERATED BY DEFAULT  AS IDENTITY NOMINVALUE NOMAXVALUE INCREMENT BY 1 START WITH 1 NOCACHE NOCYCLE NOORDER,
            Make     NVARCHAR2(100)   NULL,
            Model    NVARCHAR2(100)   NULL,
            Year     INT     NULL,
            Country  NVARCHAR2(100)   NULL,
            UserID   INT              NULL
        );

        CREATE OR REPLACE TYPE ot_Automobile AS OBJECT
        ( 
            Make varchar2(100),
            Model varchar2(100),
            Year int,
            Country varchar2(100)
        );

        CREATE OR REPLACE TYPE tt_Automobile AS TABLE OF ot_Automobile;

        CREATE OR REPLACE PROCEDURE sp_InsertCars 
        (
            p_CarList In tt_Automobile,
            p_UserID In integer,
            o_Cursor Out Sys_RefCursor
        )
        AS
        BEGIN
            DBMS_Output.Enable;

            For RowItem In (Select * From Table(p_CarList))
            Loop
            Insert Into tblCars 
            (
                Make, 
                Model, 
                Year, 
                Country, 
                UserID
            )
            Values(
                RowItem.Make,
                RowItem.Model,
                RowItem.Year,
                RowItem.Country,
                p_UserID
            );        
            End Loop;

            -- Return our results after insert
            Open o_Cursor For
            Select Make, Model, Year, Country From tblCars Where UserID = p_UserID;

        EXCEPTION
            When Others Then
            DBMS_Output.Put_Line('SQL Error: ' || SQLERRM);        

        END sp_InsertCars;

        COMMIT
        /

I know my code doesn’t work and I’m no expert, but any help would be greatly appreciated.

Thank you so much!