進階特性—預存程序呼叫與結果集資料處理


針對於預存過程,JDBC模組提供了IProcedureOperator操作器介面及其預設介面實作類別DefaultProcedureOperator來幫助你完成,儲存過程有以下幾種調用方式,舉例說明:

  • 有輸入參數無輸出參數:

    #
    IConnectionHolder _conn = JDBC.get().getDefaultConnectionHolder();
    try {
        // 执行名称为`procedure_name`的存储过程,并向该存储过程转入两个字符串参数
        IProcedureOperator<Object[]> _opt = new DefaultProcedureOperator<Object[]>("procedure_name", _conn)
                .addParameter("param1")
                .addParameter("param2")
                .execute(IResultSetHandler.ARRAY);
        // 遍历结果集集合
        for (List<Object[]> _item : _opt.getResultSets()) {
            ResultSetHelper.bind(_item).forEach(new ResultSetHelper.ItemHandler() {
                public boolean handle(ResultSetHelper.ItemWrapper wrapper, int row) throws Exception {
                    System.out.println(wrapper.toObject(new ArchiveVObject()).toJSON());
                    return true;
                }
            });
        }
    } finally {
        _conn.release();
    }
  • ##有輸入輸出參數:

    IConnectionHolder _conn = JDBC.get().getDefaultConnectionHolder();
    try {
        // 通过addOutParameter方法按存储过程输出参数顺序指定JDBC参数类型
        new DefaultProcedureOperator("procedure_name", _conn)
                .addParameter("param1")
                .addParameter("param2")
                .addOutParameter(Types.VARCHAR)
                .execute(new IProcedureOperator.IOutResultProcessor() {
                    public void process(int idx, int paramType, Object result) throws Exception {
                        System.out.println(result);
                    }
                });
    } finally {
        _conn.release();
    }
  • #另一種寫法:

    ##
    JDBC.get().openSession(new ISessionExecutor<List<List<Object[]>>>() {
        public List<List<Object[]>> execute(ISession session) throws Exception {
            // 创建存储过程操作器对象
            IProcedureOperator<Object[]> _opt = new DefaultProcedureOperator<Object[]>("procedure_name", session.getConnectionHolder())
                    .addParameter("param1")
                    .addParameter("param2")
                    .addOutParameter(Types.VARCHAR)
                    .addOutParameter(Types.INTEGER)
                    .setOutResultProcessor(new IProcedureOperator.IOutResultProcessor() {
                        public void process(int idx, int paramType, Object result) throws Exception {
                            System.out.println(result);
                        }
                    }).setResultSetHandler(IResultSetHandler.ARRAY);
            // 执行
            _opt.execute();
            return _opt.getResultSets();
        }
    });
  • #