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                ThinkChat2.0新版上線,更智能更精彩,支持會話、畫圖、視頻、閱讀、搜索等,送10W Token,即刻開啟你的AI之旅 廣告
                # 組件源碼 ``` /** * <b>方法描述:</b> 查詢(ID) <br/> * <b>創建者:</b> admin <br/> * <b>創建時間:</b> 2020-09-14 15:47:29 <br/> * * @param poolName * 入參|數據源名稱|{@link java.lang.String} * @param className * 入參|執行操作類名|{@link java.lang.String} * @param id * 入參|查詢主鍵|{@link java.io.Serializable} * @param entry * 出參|查詢結果|{@link Object} * @return -1 異常<br/> * 0 失敗<br/> * 2 無數據<br/> * 1 成功<br/> */ @Component(label = "查詢(ID)", style = "判斷型", type = "同步組件", comment = "根據數據庫主鍵查詢數據表數據,返回數據庫封裝實體對象.", version = "1.0.0", deprecated = false, author = "admin", date = "2020-09-14 03:47:29") @InParams(param = {@Param(name = "poolName", comment = "數據源名稱", type = java.lang.String.class), @Param(name = "className", comment = "執行操作類名", type = java.lang.String.class), @Param(name = "id", comment = "查詢主鍵", type = java.io.Serializable.class)}) @OutParams(param = {@Param(name = "entry", comment = "查詢結果", type = Object.class)}) @Returns(returns = {@Return(id = "-1", desp = "異常"), @Return(id = "0", desp = "失敗"), @Return(id = "2", desp = "無數據"), @Return(id = "1", desp = "成功")}) @Order(value = 2) public static ResultBase P_selectById(String poolName, String className, Serializable id) { try { AppLog.debug("根據主鍵查詢數據 組件參數,poolName={},className={},id={}", poolName, className, id); if (StringUtil.isEmpty(className)) { return ResultBase.newFailureResult("TPTD0013", "參數錯誤:執行類參數【className】不能為空"); } if (id == null) { return ResultBase.newFailureResult("TPTD0014", "參數錯誤:查詢主鍵【id】不能為空"); } if (id instanceof String) { if (StringUtil.isEmpty(id.toString())) { return ResultBase.newFailureResult("TPTD0014", "參數錯誤:查詢主鍵【id】不能為空"); } } setDatasource(poolName); Object maper = BundleUtil.getService(className); if (maper == null) { return ResultBase.newFailureResult("TPTD0010", "錯誤:當前環境未找到[" + className + "]的可用數據庫操作Mapper 實例"); } Method method = getMethod(maper.getClass(), className, MybatisPlusMapperMehtod.selectById); if (method != null) { AppLog.debug("開始執行相應的Mapper 方法"); Object obj = method.invoke(maper, id); ResultBase result = ResultBase.newSuccessResult(obj); if (obj == null) { return new ResultBase(2); } else { return result; } } } catch (Exception e) { AppLog.error(e); return ResultBase.newExceptionResult("TPTD0015", "方法調用錯誤,類:" + className + "調用:" + MybatisPlusMapperMehtod.selectById + " 方法錯誤" + AppLog.errorMsg(e)); } return ResultBase.newFailureResult("TPTD0016", "方法調用錯誤,類:" + className + "沒有可執行方法:" + MybatisPlusMapperMehtod.selectById); } ``` # 交易中組件使用方式 ![](https://img.kancloud.cn/12/a8/12a85a3832d066293eb5fa48a802e47a_1870x893.png) # 參數說明及示例 ## 入口參數 數據源名稱:使用的數據源名稱,可以為空 執行操作類名:執行 SQL 語句的類,示例: `"data.test.test.mapper.TUserMapper"` 查詢主鍵:根據數據庫主鍵查詢數據表數據,示例: `1` ## 出口參數 查詢結果:返回數據庫封裝實體對象,示例: `__INNER__["result"]` > 當交易部署到微服務上時,數據源在微服務界面上配置。
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