# 组件源码 ``` /** * <b>方法描述：</b> 查询(list) <br/> * <b>创建者：</b> admin <br/> * <b>创建时间：</b> 2020-09-14 17:01:24 <br/> * * @param poolName * 入参|数据源名称|{@link java.lang.String} * @param className * 入参|执行操作类名|{@link java.lang.String} * @param entity * 入参|条件|{@link com.baomidou.mybatisplus.extension.activerecord.Model} * @param list * 出参|查询条数|{@link java.util.List} * @return -1 异常<br/> * 0 失败<br/> * 2 无数据<br/> * 1 成功<br/> */ @Component(label = "查询(list)", style = "判断型", type = "同步组件", comment = "根据条件查询符合的全部数据，参数为空时查询全部", version = "1.0.0", deprecated = false, author = "admin", date = "2020-09-14 05:01:24") @InParams(param = {@Param(name = "poolName", comment = "数据源名称", type = java.lang.String.class), @Param(name = "className", comment = "执行操作类名", type = java.lang.String.class), @Param(name = "entity", comment = "条件", type = com.baomidou.mybatisplus.extension.activerecord.Model.class)}) @OutParams(param = {@Param(name = "list", comment = "查询条数", type = java.util.List.class)}) @Returns(returns = {@Return(id = "-1", desp = "异常"), @Return(id = "0", desp = "失败"), @Return(id = "2", desp = "无数据"), @Return(id = "1", desp = "成功")}) @Order(value = 2) public static ResultBase P_selectList(String poolName, String className, Model entity) { try { AppLog.debug("根据字段查询数据 组件参数：poolName={},className={},map={}", poolName, className, entity); if (StringUtil.isEmpty(className)) { return ResultBase.newFailureResult("TPTD0001", "参数错误：执行类参数【className】不能为空"); } setDatasource(poolName); Object maper = BundleUtil.getService(className); if (maper == null) { return ResultBase.newFailureResult("TPTD0010", "错误:当前环境未找到[" + className + "]的可用数据库操作Mapper 实例"); } Method method = getMethod(maper.getClass(), className, MybatisPlusMapperMehtod.selectList); if (method != null) { AppLog.debug("开始执行相应的Mapper 方法"); List list = (List)method.invoke(maper, Wrappers.update(entity)); if (list.isEmpty()) return new ResultBase(2); return ResultBase.newSuccessResult(list); } } catch (Exception e) { AppLog.error(e); return ResultBase.newExceptionResult("TPTD0003", "方法调用错误，类:" + className + "调用：" + MybatisPlusMapperMehtod.selectList + " 方法错误" + AppLog.errorMsg(e)); } return ResultBase.newFailureResult("TPTD0004", "方法调用错误，类:" + className + "没有可执行方法：" + MybatisPlusMapperMehtod.selectList); } ``` # 交易中组件使用方式  # 参数说明及示例 ## 入口参数 数据源名称：使用的数据源名称，可以为空 执行操作类名：执行 SQL 语句的类，示例： `"data.test.test.mapper.TUserMapper"` 条件：传入一个实体对象当做查询条件，为空时查询全部 ## 出口参数 查询条数：根据输入条件查询数据，示例： `__INNER__["list"]` > 当交易部署到微服务上时，数据源在微服务界面上配置。