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                # 組件源碼 ``` /** * <b>方法描述:</b> 查詢(總條數) <br/> * <b>創建者:</b> admin <br/> * <b>創建時間:</b> 2020-09-14 16:54:32 <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 entity * 入參|查詢條件|{@link com.baomidou.mybatisplus.extension.activerecord.Model} * @param cnt * 出參|行數|int * @return -1 異常<br/> * 0 失敗<br/> * 1 成功<br/> */ @Component(label = "查詢(總條數)", style = "判斷型", type = "同步組件", comment = "根據條件統計數據表數據,返回數據庫符合條件的數量,條件為空時統計全部", version = "1.0.0", deprecated = false, author = "admin", date = "2020-09-14 04:54:32") @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 = "entity", comment = "查詢條件", type = com.baomidou.mybatisplus.extension.activerecord.Model.class)}) @OutParams(param = {@Param(name = "cnt", comment = "行數", type = int.class)}) @Returns( returns = {@Return(id = "-1", desp = "異常"), @Return(id = "0", desp = "失敗"), @Return(id = "1", desp = "成功")}) @Order(value = 2) public static ResultBase P_selectCount(String poolName, String className, Model entity) { try { AppLog.debug("根據主鍵查詢數據 組件參數,poolName={},className={},entity={}", poolName, className, entity); if (StringUtil.isEmpty(className)) { return ResultBase.newFailureResult("TPTD0013", "參數錯誤:執行類參數【className】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.selectCount); if (method != null) { AppLog.debug("開始執行相應的Mapper 方法"); Object obj = method.invoke(maper, Wrappers.lambdaQuery(entity)); ResultBase result = ResultBase.newSuccessResult(obj); return result; } } catch (Exception e) { AppLog.error(e); return ResultBase.newExceptionResult("TPTD0015", "方法調用錯誤,類:" + className + "調用:" + MybatisPlusMapperMehtod.selectCount + " 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.selectCount); } ``` # 交易中組件使用方式 ![](https://img.kancloud.cn/c7/32/c732ba402b9445bff7e3502f0c4a0a7d_1868x891.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"` 查詢條件:傳入一個實體類對象作為查詢條件,條件為空時統計全部,示例: `__INNER__["user"]` ## 出口參數 行數:根據條件統計數據表數據,返回數據庫符合條件的數量,示例: `__INNER__["count"]` > 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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