Exemplo n.º 1
0
        public static void DeriveParameters(VirtuosoCommand command)
        {
            if (command == null)
            {
                throw new ArgumentNullException("command");
            }

            if (command.CommandType != CommandType.StoredProcedure)
            {
                throw new InvalidOperationException("DeriveParameters supports only stored procedures.");
            }

            VirtuosoConnection connection = (VirtuosoConnection)command.Connection;

            if (connection == null)
            {
                throw new InvalidOperationException("The Connection property is not set.");
            }
            if (connection.State == ConnectionState.Closed)
            {
                throw new InvalidOperationException("The connection is closed.");
            }

            IInnerCommand      innerCommand = null;
            VirtuosoDataReader reader       = null;

            try
            {
                innerCommand = connection.innerConnection.CreateInnerCommand(null);
                innerCommand.GetProcedureColumns(command.CommandText);
                reader = new VirtuosoDataReader(connection, innerCommand, null, CommandBehavior.Default, false);

                command.Parameters.Clear();
                while (reader.Read())
                {
                    CLI.InOutType iotype = (CLI.InOutType)reader.GetInt16(reader.GetOrdinal("COLUMN_TYPE"));

                    ParameterDirection direction;
                    switch (iotype)
                    {
                    case CLI.InOutType.SQL_PARAM_INPUT:
                        direction = ParameterDirection.Input;
                        break;

                    case CLI.InOutType.SQL_PARAM_OUTPUT:
                        direction = ParameterDirection.Output;
                        break;

                    case CLI.InOutType.SQL_PARAM_INPUT_OUTPUT:
                        direction = ParameterDirection.InputOutput;
                        break;

                    case CLI.InOutType.SQL_PARAM_RETURN_VALUE:
                        direction = ParameterDirection.ReturnValue;
                        break;

                    default:
#if MONO
                        direction = ParameterDirection.Input;
#endif
                        continue;
                    }

                    string name = reader.GetString(reader.GetOrdinal("COLUMN_NAME"));
                    if (name == "" && iotype == CLI.InOutType.SQL_PARAM_RETURN_VALUE)
                    {
                        name = "ReturnValue";
                    }

                    CLI.SqlType sqlType = (CLI.SqlType)reader.GetInt16(reader.GetOrdinal("DATA_TYPE"));
                    DataType    type    = DataTypeInfo.MapSqlType(sqlType);
                    if (type == null)
                    {
                        throw new SystemException("Unknown data type");
                    }

                    int sizeOrdinal = reader.GetOrdinal("COLUMN_SIZE");
                    if (sizeOrdinal < 0)
                    {
                        sizeOrdinal = reader.GetOrdinal("PRECISION");
                    }
                    int size = reader.IsDBNull(sizeOrdinal) ? 0 : reader.GetInt32(sizeOrdinal);

                    int scaleOrdinal = reader.GetOrdinal("DECIMAL_DIGITS");
                    if (scaleOrdinal < 0)
                    {
                        scaleOrdinal = reader.GetOrdinal("SCALE");
                    }
                    short scale = reader.IsDBNull(scaleOrdinal) ? (short)0 : reader.GetInt16(scaleOrdinal);

                    int          nullableOrdinal = reader.GetOrdinal("NULLABLE");
                    CLI.Nullable nullable        = (CLI.Nullable)reader.GetInt16(nullableOrdinal);
                    bool         isNullable      = (nullable != CLI.Nullable.SQL_NO_NULLS);

                    VirtuosoParameter parameter = (VirtuosoParameter)command.CreateParameter();
                    parameter.ParameterName = name;
                    parameter.Direction     = direction;
                    parameter.VirtDbType    = type.vdbType;
                    parameter.Size          = type.GetFieldSize(size);
                    parameter.Precision     = type.GetPrecision(size);
                    parameter.Scale         = (byte)scale;
                    parameter.IsNullable    = isNullable;
                    command.Parameters.Add(parameter);
                }
            }
            finally
            {
                if (reader != null)
                {
                    reader.Close();
                }
                if (innerCommand != null)
                {
                    innerCommand.Dispose();
                }
            }
        }