99 lines
3.8 KiB
Markdown
99 lines
3.8 KiB
Markdown
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## Mybatis-Plus
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### LambdaUpdateWapper 配合泛型使用报错：com.baomidou.mybatisplus.core.exceptions.MybatisPlusException: can not find lambda cache for this property [xxx] of entity [com.xxx.si.fss.ssf.ass.entity.xxx]
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```java
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public interface CloseV1Service<T extends CloseStatefulEntity> {
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BaseMapper<T> getBaseMapper();
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default void action(CloseOperateVO operateVO){
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if (NullUtils.isEmpty(operateVO.getId())){
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throw new MyException(RestResponse.MSG.PARAM_VALUE_ERROR).setMsg("未发现指定操作对象id");
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}
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T closeEntity = getBaseMapper().selectById(operateVO.getId());
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if (closeEntity==null){
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throw new MyException(RestResponse.MSG.NO_DATA_EXISTS);
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}
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closeEntity.closeable(operateVO.getCloseAction());
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LambdaUpdateWrapper<T> lambdaUpdateWrapper = Wrappers.lambdaUpdate();
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lambdaUpdateWrapper
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.eq(T::getId,operateVO.getId()) //此处抛出异常
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.set(T::getCloseStatus, operateVO.getCloseAction().getStepState());
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getBaseMapper().update(null,lambdaUpdateWrapper);
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}
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}
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```
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#### 原因：LambdaUpdateWrapper没有指定实体类类型
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#### 解决方法：为LambdaUpdateWrapper对象指定实体类类型
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```java
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@Validated
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public interface CloseV1Service<T extends CloseStatefulEntity> {
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Class<T> getTClass();
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BaseMapper<T> getBaseMapper();
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default void action(@NotNull(message = "操作VO对象不能为空") @Valid CloseOperateVO operateVO){
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if (NullUtils.isEmpty(operateVO.getId())){
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throw new MyException(RestResponse.MSG.PARAM_VALUE_ERROR).setMsg("未发现指定操作对象id");
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}
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T closeEntity = getBaseMapper().selectById(operateVO.getId());
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if (closeEntity==null){
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throw new MyException(RestResponse.MSG.NO_DATA_EXISTS);
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}
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closeEntity.closeable(operateVO.getCloseAction());
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//Wrappers.lambdaUpdate(getTClass()); 创建LambdaUpdate时指定实体类
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LambdaUpdateWrapper<T> lambdaUpdateWrapper = Wrappers.lambdaUpdate(getTClass());
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//或者lambdaUpdateWrapper.setEntityClass(getTClass());
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lambdaUpdateWrapper.eq(T::getId,operateVO.getId()).set(T::getCloseStatus, operateVO.getCloseAction().getStepState());
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getBaseMapper().update(null,lambdaUpdateWrapper);
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}
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}
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```
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### LambdaUpdateWapper 配合泛型使用出现错误：java.lang.BootstrapMethodError: call site initialization exception
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```java
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public interface CloseV1Service<T extends CloseStatefulEntity & CloseV1able> {
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Class<T> getTClass();
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BaseMapper<T> getBaseMapper();
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default void action(@NotNull(message = "操作VO对象不能为空") @Valid CloseOperateVO operateVO){
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if (NullUtils.isEmpty(operateVO.getId())){
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throw new MyException(RestResponse.MSG.PARAM_VALUE_ERROR).setMsg("未发现指定操作对象id");
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}
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T closeEntity = getBaseMapper().selectById(operateVO.getId());
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if (closeEntity==null){
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throw new MyException(RestResponse.MSG.NO_DATA_EXISTS);
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}
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closeEntity.closeable(operateVO.getCloseAction());
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LambdaUpdateWrapper<T> lambdaUpdateWrapper = Wrappers.lambdaUpdate(getTClass());
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lambdaUpdateWrapper
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.eq(T::getId,operateVO.getId()) //此处抛出异常 因为CloseStatefulEntity存在getId()方法 而CloseV1able不存在
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.set(T::getCloseStatus, operateVO.getCloseAction().getStepState());
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getBaseMapper().update(null,lambdaUpdateWrapper);
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}
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}
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```
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#### 原因：LambdaUpdateWrapper设置的泛型是因为有两个上界，LambdaUpdateWrapper使用方法引用时泛型的方法，这个方法只在泛型一个上界类中存在则抛出java.lang.BootstrapMethodError: call site initialization exception异常
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#### 解决办法：在两个上界中都添加用到的方法或者只设置一个上界
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