Java Spring JDBC Oracle 存储过程返回 null

Question

可能的重复：
Spring 的存储过程 - 从过程返回的结果始终为空。

我有以下代码，虽然我知道调用应该产生内容，但我总是返回一个空结果集，任何人都可以建议为什么吗？

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 中使用相同的参数针对同一数据库运行存储过程以确保它实际返回结果？

Answer 2

我认为一年前另一个类似的问题回答了您的问题： Spring 的存储过程 - 从过程返回的结果始终为空