Java Spring JDBC Oracle存储过程返回null [重复]

Question

可能重复：
Spring's Stored Procedure - results coming back from procedure always empty.

我有以下代码，虽然我知道调用应该会产生内容，但我总是返回一个空的结果集，谁能告诉我为什么？

ParameterizedRowMapper<ExamPaper> mapper = new ParameterizedRowMapper<ExamPaper>() {

  public ExamPaper mapRow(ResultSet rs, int rowNum) throws SQLException {


    logger.info("in the row mapper with"+rs.toString());
    logger.info("in the row mapper with x no of rows " +rowNum);

    ExamPaper examPaper = new ExamPaper();
    examPaper.setCampus(rs.getString("campus"));
    examPaper.setTitle(rs.getString("title"));
    examPaper.setPaper(rs.getString("paper"));
    examPaper.setCode(rs.getString("code"));
    examPaper.year.add(rs.getString("year"));
    examPaper.semester.add(rs.getString("semester"));
    return examPaper;
  }
};

Map params = new HashMap();
params.put("ic_search_string","fluid");
params.put("ic_location_flag", "unmc");
logger.info("calling stored procedure");
OracleStoredProcedure storedProcedure = new OracleStoredProcedure(getDataSource(),"pkg_exam_papers.p_get_exam_papers",logger, mapper);

Map results = storedProcedure.execute(params);
logger.info(results.size());

---

public class OracleStoredProcedure extends StoredProcedure 
{
  private Log logger;
  public OracleStoredProcedure(DataSource dataSource,String storedProcedureName, Log logger,ParameterizedRowMapper mapper)
  {
    super();
    this.logger = logger;

    setDataSource(dataSource);
    setFunction(false);
    setSql(storedProcedureName)

    declareParameter(new SqlParameter("ic_search_string", OracleTypes.VARCHAR));
    declareParameter(new SqlParameter("ic_location_flag", OracleTypes.VARCHAR));
    declareParameter(new SqlOutParameter("orc_results", OracleTypes.CURSOR, mapper));
    declareParameter(new SqlOutParameter("on_errcode", OracleTypes.INTEGER));
    declareParameter(new SqlOutParameter("oc_errmess", OracleTypes.CHAR));

    compile();

  }

  public Map execute(Map parameters)
  {
    Map out = new HashMap();

    try 
    {
      out = super.execute(parameters);
    }
    catch (NullPointerException nullPointerException)
    {
      logger.error("Exception when executing stored procedure: " + nullPointerException.getMessage());
    }
    catch(Exception exception)
    {
      logger.error("Exception when executing stored procedure: " + exception.getMessage());
    }

    return out;
  }
}

Answer 1

乍一看还不错。您是否尝试过在 sqlDeveloper 中使用相同的参数对同一个数据库运行存储过程，以确保它实际返回结果？

Answer 2

我认为一年前的另一个类似问题回答了您的问题：Spring's Stored Procedure - results coming back from procedure always empty