In the actual project, multiple data sources and sub-tables are involved, so shardingsphere is used. In order to simplify the code, mybatis plus is introduced
version:
mybatis plus：3.3.2
springboot：2.1.5
shardingsphere ： 4.0.0-RC2
Error message :
Caused by: org.mybatis.spring.MyBatisSystemException: nested exception is org.apache.ibatis.exceptions.PersistenceException:
### Error querying database. Cause: java.lang.ClassCastException: java.lang.Long cannot be cast to java.lang.Integer
### The error may exist in com/cxm/db/mapper/bi/CxmBiDemoDAO.java (best guess)
### The error may involve defaultParameterMap
### The error occurred while setting parameters
### SQL: SELECT id,increased_stall_count FROM cxm_bi_demo LIMIT ?,?
### Cause: java.lang.ClassCastException: java.lang.Long cannot be cast to java.lang.Integer
at org.mybatis.spring.MyBatisExceptionTranslator.translateExceptionIfPossible(MyBatisExceptionTranslator.java:92)
at org.mybatis.spring.SqlSessionTemplate$SqlSessionInterceptor.invoke(SqlSessionTemplate.java:440)
at com.sun.proxy.$Proxy150.selectList(Unknown Source)
at org.mybatis.spring.SqlSessionTemplate.selectList(SqlSessionTemplate.java:223)
at com.baomidou.mybatisplus.core.override.MybatisMapperMethod.executeForIPage(MybatisMapperMethod.java:134)
at com.baomidou.mybatisplus.core.override.MybatisMapperMethod.execute(MybatisMapperMethod.java:96)
at com.baomidou.mybatisplus.core.override.MybatisMapperProxy.invoke(MybatisMapperProxy.java:96)
at com.sun.proxy.$Proxy157.selectPage(Unknown Source)
at com.cxm.service.CxmBaseServiceImpl.page(CxmBaseServiceImpl.java:292)
at com.cxm.service.CxmBaseServiceImpl.page(CxmBaseServiceImpl.java:307)
at com.cxm.service.CxmBaseServiceImpl$$FastClassBySpringCGLIB$$5d9c5448.invoke(<generated>)
at org.springframework.cglib.proxy.MethodProxy.invoke(MethodProxy.java:218)
at org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept(CglibAopProxy.java:684)
at com.cxm.service.impl.CxmBiDemoServiceImpl$$EnhancerBySpringCGLIB$$e0e43073.page(<generated>)
at com.cxm.service.impl.CxmBiDailyIncreasedStatisticServiceImpl.queryIn(CxmBiDailyIncreasedStatisticServiceImpl.java:86)
at com.cxm.service.impl.CxmBiDailyIncreasedStatisticServiceImpl$$FastClassBySpringCGLIB$$588bac5b.invoke(<generated>)
at org.springframework.cglib.proxy.MethodProxy.invoke(MethodProxy.java:218)
at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.invokeJoinpoint(CglibAopProxy.java:749)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:163)
at org.springframework.aop.framework.adapter.MethodBeforeAdviceInterceptor.invoke(MethodBeforeAdviceInterceptor.java:56)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:175)
at org.springframework.aop.aspectj.AspectJAfterAdvice.invoke(AspectJAfterAdvice.java:47)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:175)
at org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:93)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186)
at org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept(CglibAopProxy.java:688)
at com.cxm.service.impl.CxmBiDailyIncreasedStatisticServiceImpl$$EnhancerBySpringCGLIB$$bbed46d4.queryIn(<generated>)
at com.cxm.CxmRetailApplication.run(CxmRetailApplication.java:68)
at org.springframework.boot.SpringApplication.callRunner(SpringApplication.java:813)
... 5 common frames omitted
Caused by: org.apache.ibatis.exceptions.PersistenceException:
### Error querying database. Cause: java.lang.ClassCastException: java.lang.Long cannot be cast to java.lang.Integer
### The error may exist in com/cxm/db/mapper/bi/CxmBiDemoDAO.java (best guess)
### The error may involve defaultParameterMap
### The error occurred while setting parameters
### SQL: SELECT id,increased_stall_count FROM cxm_bi_demo LIMIT ?,?
### Cause: java.lang.ClassCastException: java.lang.Long cannot be cast to java.lang.Integer
at org.apache.ibatis.exceptions.ExceptionFactory.wrapException(ExceptionFactory.java:30)
at org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:149)
at org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:140)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.mybatis.spring.SqlSessionTemplate$SqlSessionInterceptor.invoke(SqlSessionTemplate.java:426)
... 32 common frames omitted
Caused by: java.lang.ClassCastException: java.lang.Long cannot be cast to java.lang.Integer
at org.apache.shardingsphere.core.optimize.sharding.segment.select.pagination.Pagination.getValue(Pagination.java:60)
at org.apache.shardingsphere.core.optimize.sharding.segment.select.pagination.Pagination.<init>(Pagination.java:54)
at org.apache.shardingsphere.core.optimize.sharding.segment.select.pagination.engine.LimitPaginationEngine.createPagination(LimitPaginationEngine.java:40)
at org.apache.shardingsphere.core.optimize.sharding.segment.select.pagination.engine.PaginationEngine.createPagination(PaginationEngine.java:50)
at org.apache.shardingsphere.core.optimize.sharding.engnie.dml.ShardingSelectOptimizeEngine.optimize(ShardingSelectOptimizeEngine.java:63)
at org.apache.shardingsphere.core.optimize.sharding.engnie.dml.ShardingSelectOptimizeEngine.optimize(ShardingSelectOptimizeEngine.java:47)
at org.apache.shardingsphere.core.route.router.sharding.ParsingSQLRouter.route(ParsingSQLRouter.java:72)
at org.apache.shardingsphere.core.route.PreparedStatementRoutingEngine.route(PreparedStatementRoutingEngine.java:66)
at org.apache.shardingsphere.core.PreparedQueryShardingEngine.route(PreparedQueryShardingEngine.java:60)
at org.apache.shardingsphere.core.BaseShardingEngine.executeRoute(BaseShardingEngine.java:86)
at org.apache.shardingsphere.core.BaseShardingEngine.shard(BaseShardingEngine.java:70)
at org.apache.shardingsphere.shardingjdbc.jdbc.core.statement.ShardingPreparedStatement.shard(ShardingPreparedStatement.java:224)
at org.apache.shardingsphere.shardingjdbc.jdbc.core.statement.ShardingPreparedStatement.execute(ShardingPreparedStatement.java:170)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.apache.ibatis.logging.jdbc.PreparedStatementLogger.invoke(PreparedStatementLogger.java:59)
at com.sun.proxy.$Proxy227.execute(Unknown Source)
at org.apache.ibatis.executor.statement.PreparedStatementHandler.query(PreparedStatementHandler.java:64)
at org.apache.ibatis.executor.statement.RoutingStatementHandler.query(RoutingStatementHandler.java:79)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.apache.ibatis.plugin.Plugin.invoke(Plugin.java:63)
at com.sun.proxy.$Proxy226.query(Unknown Source)
at com.baomidou.mybatisplus.core.executor.MybatisSimpleExecutor.doQuery(MybatisSimpleExecutor.java:67)
at org.apache.ibatis.executor.BaseExecutor.queryFromDatabase(BaseExecutor.java:324)
at org.apache.ibatis.executor.BaseExecutor.query(BaseExecutor.java:156)
at com.baomidou.mybatisplus.core.executor.MybatisCachingExecutor.query(MybatisCachingExecutor.java:163)
at com.baomidou.mybatisplus.core.executor.MybatisCachingExecutor.query(MybatisCachingExecutor.java:90)
at org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:147)
... 38 common frames omittedproblem analysis:
Trace the log and check the source code. It is found that a type conversion in the Pagination of shardingsphere is directly written to the int type.
Because the value worn in the paging parameter is of Long type, and the following method is directly cast to int, which leads to an error
private int getValue(final PaginationValueSegment paginationValueSegment, final List<Object> parameters) {
return paginationValueSegment instanceof ParameterMarkerPaginationValueSegment
? (int) parameters.get(((ParameterMarkerPaginationValueSegment) paginationValueSegment).getParameterIndex())
: ((NumberLiteralPaginationValueSegment) paginationValueSegment).getValue();
}Because the attribute in the paging object IPage of mybatisplus is long
solution:
1: Custom implementation of com.baomidou.mybatisplus.core.metadata.IPage;, modifying
private long size; private long current; to int type can fix this problem, but no coverage test is performed, and I don’t know if it will cause other problems
2: Re-pagination of shardingsphere
3: The shardingsphere-core is abandoned, the sub-database and sub-table are formed by Alibaba Cloud, and multiple data sources are implemented using AbstractRoutingDataSource custom annotations