问题遇到的现象和发生背景
shardingsphere分表，查询多个表的数据是报空指针
问题相关代码，请勿粘贴截图
public Collection<String> doSharding(Collection<String> collection, ComplexKeysShardingValue<String> shardingValue) {
List<String> shardResults = new ArrayList<>();
SimpleDateFormat dateformat = new SimpleDateFormat("yyyyMM");
Calendar cal = Calendar.getInstance();
Map<String, Collection<String>> shardingValuesMap = shardingValue.getColumnNameAndShardingValuesMap();
Map<String, Range<String>> columnNameAndRangeValuesMap = shardingValue.getColumnNameAndRangeValuesMap();
if (shardingValuesMap.size() != 0) {
List<String> list = (List<String>) shardingValuesMap.get("id");
String subStr = getIndex("id", list.get(0));
shardResults.add(CERT_TABLE + "_" + subStr);
} else {
Range<String> shardKey = columnNameAndRangeValuesMap.get(DAY_COLUMN);
String startShardKey = shardKey.lowerEndpoint();
String endShardKey = shardKey.upperEndpoint();
// 获取开始的年
Date startTime = null;
// 获取结束的年
Date endTime = null;
try {
endTime = dateformat.parse(endShardKey);
startTime = dateformat.parse(startShardKey);
} catch (ParseException e) {
e.printStackTrace();
}
while (startTime.getTime() <= endTime.getTime()) {
shardResults.add(CERT_TABLE + "_" + dateformat.format(startTime));
cal.setTime(startTime);
cal.add(Calendar.MONTH, 1);
startTime = cal.getTime();
}
}
return shardResults;
}
rules:
sharding:
sharding-algorithms:
# 复合分片算法配置
shard-tb:
type: ShardTb
props:
algorithm-class-name: cn.ca.matrix.lra.server.configuration.sharding.ShardTb
tables:
T_OPS_CA_CERTIFICATE:
# 指定分表规则
actual-data-nodes: ds0.t_ops_ca_certificate_${2021..2025}0${1..9}, ds0.t_ops_ca_certificate_${2021..2025}${10..12}
table-strategy:
complex:
sharding-columns: OPERATE_MONTH,ID
sharding-algorithm-name: shard-tb
运行结果及报错内容
[matrix-lra] 2021-11-24 14:24:42.566 INFO 23416 --- [io-23110-exec-4] ShardingSphere-SQL : Actual SQL: ds0 ::: SELECT count(0) FROM T_OPS_CA_CERTIFICATE_202110 WHERE (operate_month BETWEEN ? AND ?) ::: [202110, 202111]
[matrix-lra] 2021-11-24 14:24:42.566 INFO 23416 --- [io-23110-exec-4] ShardingSphere-SQL : Actual SQL: ds0 ::: SELECT count(0) FROM T_OPS_CA_CERTIFICATE_202111 WHERE (operate_month BETWEEN ? AND ?) ::: [202110, 202111]
[matrix-lra] 2021-11-24 14:24:42.670 INFO 23416 --- [io-23110-exec-4] c.c.m.l.s.c.OpsCaExceptionHandler : nested exception is org.apache.ibatis.exceptions.PersistenceException:
### Error querying database. Cause: java.lang.NullPointerException
### The error may exist in cn/ca/matrix/lra/server/dao/mapper/cert/BaseCertificateMapper.java (best guess)
### The error may involve cn.ca.matrix.lra.server.dao.mapper.cert.BaseCertificateMapper.selectByExample_COUNT
### The error occurred while handling results
### SQL: SELECT count(0) FROM T_OPS_CA_CERTIFICATE WHERE (operate_month BETWEEN ? AND ?)
### Cause: java.lang.NullPointerException
org.mybatis.spring.MyBatisSystemException: nested exception is org.apache.ibatis.exceptions.PersistenceException:
### Error querying database. Cause: java.lang.NullPointerException
### The error may exist in cn/ca/matrix/lra/server/dao/mapper/cert/BaseCertificateMapper.java (best guess)
### The error may involve cn.ca.matrix.lra.server.dao.mapper.cert.BaseCertificateMapper.selectByExample_COUNT
### The error occurred while handling results
### SQL: SELECT count(0) FROM T_OPS_CA_CERTIFICATE WHERE (operate_month BETWEEN ? AND ?)
### Cause: java.lang.NullPointerException
at org.mybatis.spring.MyBatisExceptionTranslator.translateExceptionIfPossible(MyBatisExceptionTranslator.java:77)
at org.mybatis.spring.SqlSessionTemplate$SqlSessionInterceptor.invoke(SqlSessionTemplate.java:446)
at com.sun.proxy.$Proxy262.selectList(Unknown Source)
at org.mybatis.spring.SqlSessionTemplate.selectList(SqlSessionTemplate.java:230)
at org.apache.ibatis.binding.MapperMethod.executeForMany(MapperMethod.java:139)
at org.apache.ibatis.binding.MapperMethod.execute(MapperMethod.java:76)
at org.apache.ibatis.binding.MapperProxy.invoke(MapperProxy.java:59)
at com.sun.proxy.$Proxy270.selectByExample(Unknown Source)
at cn.ca.matrix.lra.server.service.ManageBaseService.selectByExample(ManageBaseService.java:82)
at cn.ca.matrix.lra.server.service.ManageBaseService.selectByQuery(ManageBaseService.java:112)
at cn.ca.matrix.lra.server.service.cert.impl.CertificateServiceImpl.queryListXml(CertificateServiceImpl.java:273)
at cn.ca.matrix.lra.server.service.cert.impl.CertificateServiceImpl$$FastClassBySpringCGLIB$$f63a4f3.invoke(<generated>)
at org.springframework.cglib.proxy.MethodProxy.invoke(MethodProxy.java:218)
at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.invokeJoinpoint(CglibAopProxy.java:771)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:163)
at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.proceed(CglibAopProxy.java:749)
at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:367)
at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:118)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186)
at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.proceed(CglibAopProxy.java:749)
at org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept(CglibAopProxy.java:691)
at cn.ca.matrix.lra.server.service.cert.impl.CertificateServiceImpl$$EnhancerBySpringCGLIB$$297f2400.queryListXml(<generated>)
at cn.ca.matrix.lra.server.controller.biz.CertOpsController.queryList(CertOpsController.java:76)
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.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:190)
at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:138)
at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:105)
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:878)
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:792)
at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:87)
at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1040)
at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:943)
at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1006)
at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:898)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:626)
at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:883)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:733)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:320)
at org.springframework.security.web.access.intercept.FilterSecurityInterceptor.invoke(FilterSecurityInterceptor.java:126)
at org.springframework.security.web.access.intercept.FilterSecurityInterceptor.doFilter(FilterSecurityInterceptor.java:90)
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334)
at org.springframework.security.web.access.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:118)
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334)
at org.springframework.security.web.session.SessionManagementFilter.doFilter(SessionManagementFilter.java:137)
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334)
at org.springframework.security.web.authentication.AnonymousAuthenticationFilter.doFilter(AnonymousAuthenticationFilter.java:111)
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334)
at org.springframework.security.web.servletapi.SecurityContextHolderAwareRequestFilter.doFilter(SecurityContextHolderAwareRequestFilter.java:158)
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334)
at org.springframework.security.web.savedrequest.RequestCacheAwareFilter.doFilter(RequestCacheAwareFilter.java:63)
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334)
at org.springframework.security.web.authentication.logout.LogoutFilter.doFilter(LogoutFilter.java:116)
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334)
at org.springframework.security.web.header.HeaderWriterFilter.doHeadersAfter(HeaderWriterFilter.java:92)
at org.springframework.security.web.header.HeaderWriterFilter.doFilterInternal(HeaderWriterFilter.java:77)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334)
at org.springframework.security.web.context.SecurityContextPersistenceFilter.doFilter(SecurityContextPersistenceFilter.java:105)
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334)
at org.springframework.security.web.context.request.async.WebAsyncManagerIntegrationFilter.doFilterInternal(WebAsyncManagerIntegrationFilter.java:56)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334)
at org.springframework.security.web.FilterChainProxy.doFilterInternal(FilterChainProxy.java:215)
at org.springframework.security.web.FilterChainProxy.doFilter(FilterChainProxy.java:178)
at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:358)
at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:271)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at org.springframework.boot.actuate.metrics.web.servlet.WebMvcMetricsFilter.doFilterInternal(WebMvcMetricsFilter.java:109)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:201)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:202)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:97)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:541)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:143)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:78)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:343)
at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:374)
at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:65)
at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:868)
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1590)
at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.lang.Thread.run(Thread.java:748)
Caused by: org.apache.ibatis.exceptions.PersistenceException:
### Error querying database. Cause: java.lang.NullPointerException
### The error may exist in cn/ca/matrix/lra/server/dao/mapper/cert/BaseCertificateMapper.java (best guess)
### The error may involve cn.ca.matrix.lra.server.dao.mapper.cert.BaseCertificateMapper.selectByExample_COUNT
### The error occurred while handling results
### SQL: SELECT count(0) FROM T_OPS_CA_CERTIFICATE WHERE (operate_month BETWEEN ? AND ?)
### Cause: java.lang.NullPointerException
at org.apache.ibatis.exceptions.ExceptionFactory.wrapException(ExceptionFactory.java:30)
at org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:150)
at org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:141)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.mybatis.spring.SqlSessionTemplate$SqlSessionInterceptor.invoke(SqlSessionTemplate.java:433)
... 98 common frames omitted
Caused by: java.lang.NullPointerException: null
at org.apache.shardingsphere.sharding.merge.dql.groupby.GroupByMemoryMergedResult.getValueCaseSensitiveFromTables(GroupByMemoryMergedResult.java:134)
at org.apache.shardingsphere.sharding.merge.dql.groupby.GroupByMemoryMergedResult.getValueCaseSensitive(GroupByMemoryMergedResult.java:124)
at org.apache.shardingsphere.sharding.merge.dql.groupby.GroupByMemoryMergedResult.init(GroupByMemoryMergedResult.java:73)
at org.apache.shardingsphere.sharding.merge.dql.groupby.GroupByMemoryMergedResult.init(GroupByMemoryMergedResult.java:53)
at org.apache.shardingsphere.infra.merge.result.impl.memory.MemoryMergedResult.<init>(MemoryMergedResult.java:51)
at org.apache.shardingsphere.sharding.merge.dql.groupby.GroupByMemoryMergedResult.<init>(GroupByMemoryMergedResult.java:56)
at org.apache.shardingsphere.sharding.merge.dql.ShardingDQLResultMerger.getGroupByMergedResult(ShardingDQLResultMerger.java:108)
at org.apache.shardingsphere.sharding.merge.dql.ShardingDQLResultMerger.build(ShardingDQLResultMerger.java:78)
at org.apache.shardingsphere.sharding.merge.dql.ShardingDQLResultMerger.merge(ShardingDQLResultMerger.java:63)
at org.apache.shardingsphere.infra.merge.MergeEngine.executeMerge(MergeEngine.java:90)
at org.apache.shardingsphere.infra.merge.MergeEngine.merge(MergeEngine.java:80)
at org.apache.shardingsphere.driver.jdbc.core.statement.ShardingSpherePreparedStatement.mergeQuery(ShardingSpherePreparedStatement.java:393)
at org.apache.shardingsphere.driver.jdbc.core.statement.ShardingSpherePreparedStatement.getResultSet(ShardingSpherePreparedStatement.java:339)
at org.apache.ibatis.executor.resultset.DefaultResultSetHandler.getFirstResultSet(DefaultResultSetHandler.java:239)
at org.apache.ibatis.executor.resultset.DefaultResultSetHandler.handleResultSets(DefaultResultSetHandler.java:189)
at org.apache.ibatis.executor.statement.PreparedStatementHandler.query(PreparedStatementHandler.java:64)
at org.apache.ibatis.executor.statement.RoutingStatementHandler.query(RoutingStatementHandler.java:79)
at org.apache.ibatis.executor.SimpleExecutor.doQuery(SimpleExecutor.java:63)
at org.apache.ibatis.executor.BaseExecutor.queryFromDatabase(BaseExecutor.java:326)
at org.apache.ibatis.executor.BaseExecutor.query(BaseExecutor.java:156)
at org.apache.ibatis.executor.CachingExecutor.query(CachingExecutor.java:109)
at com.github.pagehelper.util.ExecutorUtil.executeAutoCount(ExecutorUtil.java:138)
at com.github.pagehelper.PageInterceptor.count(PageInterceptor.java:148)
at com.github.pagehelper.PageInterceptor.intercept(PageInterceptor.java:97)
at org.apache.ibatis.plugin.Plugin.invoke(Plugin.java:61)
at com.sun.proxy.$Proxy361.query(Unknown Source)
at org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:148)
... 104 common frames omitted
我的解答思路和尝试过的方法
第一次接触，完全没思路
我想要达到的结果
希望大佬能帮忙解决这个问题
