如何在Java，Spring中使用SimpleJdbcCall读取空值？

SimpleJdbcCall jdbcCall = new SimpleJdbcCall(jdbcTemplate)
        .withProcedureName("your_procedure_name");

jdbcCall.declareParameters(
        new SqlParameter("input_param", Types.INTEGER),
        new SqlOutParameter("output_param", Types.VARCHAR));

Map<String, Object> result = jdbcCall.execute();
String outputValue = (String) result.get("output_param");

if (outputValue == null) {
    // 处理空值的逻辑
} else {
    // 处理非空值的逻辑
}