How to pass DataTable as a parameter to Stored Pro

问题:

My code looks like this:

public void InsertSampleData(DataTable tempTable)
    {
       session.Transaction.Commit();
        var connection = session.GetSessionImplementation().Connection;
        using (var sqlConnection = (SqlConnection)connection)
        {
            using (var cmd = sqlConnection.CreateCommand())
            {
                cmd.CommandType = CommandType.StoredProcedure;
                cmd.CommandText = "dbo.insertData";
                cmd.Parameters.Add("@sItems", SqlDbType.Structured);
                var sqlParam = cmd.Parameters["@Items"];
                sqlParam.Direction = ParameterDirection.Input;
                sqlParam.TypeName = "[dbo].[DataItemType]";
                sqlParam.Value = tempTable;
                cmd.ExecuteNonQuery();
            }
        }
    }

The code works fine but if I do not commit the transaction it throws an exception as shown

System.InvalidOperationException: ExecuteNonQuery requires the command to have a transaction when the connection assigned to the command is in a pending local transaction. The Transaction property of the command has not been initialized.

But I don't want the transaction to be commited yet before completing the whole operation. How can I achieve this??

回答1:

the issue is that the transaction was supposed to use has been committed and already has been disposed, thus either instantiate a new SqlConnection or get a new session and then run the query as part of the new session.

public void InsertSampleData(DataTable tempTable)
{
    session.Transaction.Commit();

    using (var sqlConnection = new SqlConnection(session.GetSessionImplementation()
                                       .Connection.ConnectionString))
    {
        using (var cmd = sqlConnection.CreateCommand())
        {
            cmd.CommandType = CommandType.StoredProcedure;
            cmd.CommandText = "dbo.insertData";
            cmd.Parameters.Add("@sItems", SqlDbType.Structured);
            var sqlParam = cmd.Parameters["@Items"];
            sqlParam.Direction = ParameterDirection.Input;
            sqlParam.TypeName = "[dbo].[DataItemType]";
            sqlParam.Value = tempTable;
            cmd.ExecuteNonQuery();
        }
    }
}

or

public void InsertSampleData(DataTable tempTable)
    {
       session.Transaction.Commit();
        var connection = session.SessionFactory.OpenSession().GetSessionImplementation().Connection;
        using (var sqlConnection = (SqlConnection)connection)
        {
            using (var cmd = sqlConnection.CreateCommand())
            {
                cmd.CommandType = CommandType.StoredProcedure;
                cmd.CommandText = "dbo.insertData";
                cmd.Parameters.Add("@sItems", SqlDbType.Structured);
                var sqlParam = cmd.Parameters["@Items"];
                sqlParam.Direction = ParameterDirection.Input;
                sqlParam.TypeName = "[dbo].[DataItemType]";
                sqlParam.Value = tempTable;
                cmd.ExecuteNonQuery();
            }
        }
    }

BTW, why are using SQLConnection why arent you exexurting the query using the Nhibernate Session, you could do the everything that you are doing right now using the Nhibernate Session.

session.CreateSQLQuery(<your sql>)
.SetParameters()   //and various other API to set your parameters
.ExecuteUpdate();