本文主要是介绍民航电子数据库：报错merge sql error, dbType null, druid-1.1.9, sql : xxx，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！
目录
- 一、场景
- 二、SQL
- 三、报错信息
- 四、排查
- 五、原因
- 六、解决
一、场景
1、对接民航电子数据库
2、limit查询时报错
二、SQL
SELECT openid,headimgurl,nickname FROM t_mb_weixinuser
WHERE openid=? AND vdnId = ?
LIMIT 1
三、报错信息
merge sql error, dbType null, druid-1.1.9, sql : SELECT openid,headimgurl,nickname FROM t_mb_weixinuserWHERE openid=? AND vdnId = ?LIMIT 1
com.alibaba.druid.sql.parser.ParserException: syntax error, error in :' LIMIT 1', expect IDENTIFIER, actual IDENTIFIER pos 101, line 2, column 36, token IDENTIFIER LIMITat com.alibaba.druid.sql.parser.SQLParser.printError(SQLParser.java:284)at com.alibaba.druid.sql.parser.SQLStatementParser.parseStatementList(SQLStatementParser.java:423)at com.alibaba.druid.sql.parser.SQLStatementParser.parseStatementList(SQLStatementParser.java:72)at com.alibaba.druid.sql.visitor.ParameterizedOutputVisitorUtils.parameterize(ParameterizedOutputVisitorUtils.java:88)at com.alibaba.druid.sql.visitor.ParameterizedOutputVisitorUtils.parameterize(ParameterizedOutputVisitorUtils.java:50)at com.alibaba.druid.filter.stat.StatFilter.mergeSql(StatFilter.java:147)at com.alibaba.druid.filter.stat.StatFilter.createSqlStat(StatFilter.java:648)at com.alibaba.druid.filter.stat.StatFilter.statementPrepareAfter(StatFilter.java:311)at com.alibaba.druid.filter.FilterEventAdapter.connection_prepareStatement(FilterEventAdapter.java:158)at com.alibaba.druid.filter.FilterChainImpl.connection_prepareStatement(FilterChainImpl.java:523)at com.alibaba.druid.proxy.jdbc.ConnectionProxyImpl.prepareStatement(ConnectionProxyImpl.java:384)at com.alibaba.druid.pool.DruidPooledConnection.prepareStatement(DruidPooledConnection.java:421)at org.apache.shardingsphere.shardingjdbc.executor.PreparedStatementExecutor.createPreparedStatement(PreparedStatementExecutor.java:86)at org.apache.shardingsphere.shardingjdbc.executor.PreparedStatementExecutor.access$100(PreparedStatementExecutor.java:45)at org.apache.shardingsphere.shardingjdbc.executor.PreparedStatementExecutor$1.createStatementExecuteUnit(PreparedStatementExecutor.java:78)at org.apache.shardingsphere.sharding.execute.sql.prepare.SQLExecutePrepareTemplate.getSQLExecuteGroup(SQLExecutePrepareTemplate.java:96)at org.apache.shardingsphere.sharding.execute.sql.prepare.SQLExecutePrepareTemplate.getSQLExecuteGroups(SQLExecutePrepareTemplate.java:87)at org.apache.shardingsphere.sharding.execute.sql.prepare.SQLExecutePrepareTemplate.getSynchronizedExecuteUnitGroups(SQLExecutePrepareTemplate.java:62)at org.apache.shardingsphere.sharding.execute.sql.prepare.SQLExecutePrepareTemplate.getExecuteUnitGroups(SQLExecutePrepareTemplate.java:54)at org.apache.shardingsphere.shardingjdbc.executor.PreparedStatementExecutor.obtainExecuteGroups(PreparedStatementExecutor.java:69)at org.apache.shardingsphere.shardingjdbc.executor.PreparedStatementExecutor.init(PreparedStatementExecutor.java:64)at org.apache.shardingsphere.shardingjdbc.jdbc.core.statement.ShardingPreparedStatement.initPreparedStatementExecutor(ShardingPreparedStatement.java:211)at org.apache.shardingsphere.shardingjdbc.jdbc.core.statement.ShardingPreparedStatement.execute(ShardingPreparedStatement.java:144)at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)at java.lang.reflect.Method.invoke(Method.java:498)at org.apache.ibatis.logging.jdbc.PreparedStatementLogger.invoke(PreparedStatementLogger.java:59)at com.sun.proxy.$Proxy155.execute(Unknown Source)at org.apache.ibatis.executor.statement.PreparedStatementHandler.query(PreparedStatementHandler.java:63)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:324)at org.apache.ibatis.executor.BaseExecutor.query(BaseExecutor.java:156)at org.apache.ibatis.executor.CachingExecutor.query(CachingExecutor.java:109)at com.github.pagehelper.PageInterceptor.intercept(PageInterceptor.java:108)at org.apache.ibatis.plugin.Plugin.invoke(Plugin.java:61)at com.sun.proxy.$Proxy153.query(Unknown Source)at org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:148)at org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:141)at org.apache.ibatis.session.defaults.DefaultSqlSession.selectOne(DefaultSqlSession.java:77)at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)at java.lang.reflect.Method.invoke(Method.java:498)at org.mybatis.spring.SqlSessionTemplate$SqlSessionInterceptor.invoke(SqlSessionTemplate.java:433)at com.sun.proxy.$Proxy94.selectOne(Unknown Source)at org.mybatis.spring.SqlSessionTemplate.selectOne(SqlSessionTemplate.java:166)at org.apache.ibatis.binding.MapperMethod.execute(MapperMethod.java:82)at org.apache.ibatis.binding.MapperProxy.invoke(MapperProxy.java:59)at com.sun.proxy.$Proxy99.findUserInfoByUserId(Unknown Source)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.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:343)at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:198)at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:163)at org.springframework.dao.support.PersistenceExceptionTranslationInterceptor.invoke(PersistenceExceptionTranslationInterceptor.java:139)at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186)at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:212)at com.sun.proxy.$Proxy100.findUserInfoByUserId(Unknown Source)at com.xxx.service.impl.SessionMsgServiceImpl.findUserInfoByUserId(SessionMsgServiceImpl.java:68)at com.xxx.service.impl.SessionMsgServiceImpl$$FastClassBySpringCGLIB$$b9b66a9.invoke(<generated>)at org.springframework.cglib.proxy.MethodProxy.invoke(MethodProxy.java:218)at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.invokeJoinpoint(CglibAopProxy.java:749)at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:163)at org.springframework.aop.aspectj.MethodInvocationProceedingJoinPoint.proceed(MethodInvocationProceedingJoinPoint.java:88)at com.xxx.datasource.DataSourceAspect.around(DataSourceAspect.java:47)at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)at java.lang.reflect.Method.invoke(Method.java:498)at org.springframework.aop.aspectj.AbstractAspectJAdvice.invokeAdviceMethodWithGivenArgs(AbstractAspectJAdvice.java:644)at org.springframework.aop.aspectj.AbstractAspectJAdvice.invokeAdviceMethod(AbstractAspectJAdvice.java:633)at org.springframework.aop.aspectj.AspectJAroundAdvice.invoke(AspectJAroundAdvice.java:70)at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:175)at org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:93)at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186)at org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept(CglibAopProxy.java:688)at com.xxx.service.impl.SessionMsgServiceImpl$$EnhancerBySpringCGLIB$$652fb78d.findUserInfoByUserId(<generated>)at com.xxx.util.MainHandlerUtil.insertSessionInfo(MainHandlerUtil.java:407)at com.xxx.util.MainHandlerUtil.proccessMain(MainHandlerUtil.java:112)at com.xxx.rocketmq.listener.ReceiveMessageConsumerServiceImpl.ASS_CCS_NewVisitorMsgEvt(ReceiveMessageConsumerServiceImpl.java:175)at com.xxx.rocketmq.listener.ReceiveMessageConsumerServiceImpl.consumerProcess(ReceiveMessageConsumerServiceImpl.java:106)at com.xxx.rocketmq.listener.base.RocketMQMessageService.consumeMessage(RocketMQMessageService.java:52)at org.apache.rocketmq.client.impl.consumer.ConsumeMessageConcurrentlyService$ConsumeRequest.run(ConsumeMessageConcurrentlyService.java:409)at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)at java.util.concurrent.FutureTask.run(FutureTask.java:266)at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)at java.lang.Thread.run(Thread.java:750)
四、排查
1、同样的代码，当对接mysql数据库时，查询是正常的
结论：对接民航电子数据库引起报错
五、原因
查看报错信息，应该是druid-1.1.9这个版本的依赖不兼容导致
六、解决
升级druid依赖的版本
这里是将druid-1.1.9升级为druid-1.1.22
<!-- druid数据源 -->
<dependency><groupId>com.alibaba</groupId><artifactId>druid</artifactId><version>1.1.22</version>
</dependency>
升级后即可正常分页查询
这篇关于民航电子数据库：报错merge sql error, dbType null, druid-1.1.9, sql : xxx的文章就介绍到这儿，希望我们推荐的文章对编程师们有所帮助！
