前言

mysql 5.7
ssm

前两天遇到了这个异常，记录一下：

[INFO][2019-10-06 02:03:39,268][org.springframework.beans.factory.xml.XmlBeanDefinitionReader]Loading XML bean definitions from class path resource [org/springframework/jdbc/support/sql-error-codes.xml]
[INFO][2019-10-06 02:03:39,296][org.springframework.jdbc.support.SQLErrorCodesFactory]SQLErrorCodes loaded: [DB2, Derby, H2, HSQL, Informix, MS-SQL, MySQL, Oracle, PostgreSQL, Sybase, Hana]

分析

Log级别是INFO
未输出明确的错误原因
仅可以确定是sql错误，但无法确定是哪个sql错误。

解决办法

对代码添加try…catch，捕获错误并输出。获得的输出像这样：

[INFO][2019-10-06 02:03:39,268][org.springframework.beans.factory.xml.XmlBeanDefinitionReader]Loading XML bean definitions from class path resource [org/springframework/jdbc/support/sql-error-codes.xml]
[INFO][2019-10-06 02:03:39,296][org.springframework.jdbc.support.SQLErrorCodesFactory]SQLErrorCodes loaded: [DB2, Derby, H2, HSQL, Informix, MS-SQL, MySQL, Oracle, PostgreSQL, Sybase, Hana]
[ERROR][2019-10-06 02:03:39,316][ec.web.listener.StartupManage]error
org.springframework.jdbc.BadSqlGrammarException:
### Error querying database.  Cause: com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: Expression #2 of SELECT list is not in GROUP BY clause and contains nonaggregated column 'exchange.app.typename' which is not functionally dependent on columns in GROUP BY clause; this is incompatible with sql_mode=only_full_group_by
### The error may exist in URL [jar:file:/D:/ExchangeDeploy/apache-tomcat-8.5.29-9020/webapps/manage/WEB-INF/lib/exchange_app-1.0-SNAPSHOT.jar!/ec/web/app/mapper/AppConfigMapper.xml]
### The error may involve defaultParameterMap
### The error occurred while setting parameters
### SQL: SELECT  typekey,typename FROM  app_config AS app GROUP BY  app.typekey
### Cause: com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: Expression #2 of SELECT list is not in GROUP BY clause and contains nonaggregated column 'exchange.app.typename' which is not functionally dependent on columns in GROUP BY clause; this is incompatible with sql_mode=only_full_group_by
; bad SQL grammar []; nested exception is com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: Expression #2 of SELECT list is not in GROUP BY clause and contains nonaggregated column 'exchange.app.typename' which is not functionally dependent on columns in GROUP BY clause; this is incompatible with sql_mode=only_full_group_byat org.springframework.jdbc.support.SQLExceptionSubclassTranslator.doTranslate(SQLExceptionSubclassTranslator.java:91)at org.springframework.jdbc.support.AbstractFallbackSQLExceptionTranslator.translate(AbstractFallbackSQLExceptionTranslator.java:73)at org.springframework.jdbc.support.AbstractFallbackSQLExceptionTranslator.translate(AbstractFallbackSQLExceptionTranslator.java:81)at org.mybatis.spring.MyBatisExceptionTranslator.translateExceptionIfPossible(MyBatisExceptionTranslator.java:74)at org.mybatis.spring.SqlSessionTemplate$SqlSessionInterceptor.invoke(SqlSessionTemplate.java:421)at com.sun.proxy.$Proxy40.selectList(Unknown Source)at org.mybatis.spring.SqlSessionTemplate.selectList(SqlSessionTemplate.java:206)at org.apache.ibatis.binding.MapperMethod.executeForMany(MapperMethod.java:122)at org.apache.ibatis.binding.MapperMethod.execute(MapperMethod.java:64)at org.apache.ibatis.binding.MapperProxy.invoke(MapperProxy.java:53)at com.sun.proxy.$Proxy135.findKey(Unknown Source)at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)at java.lang.reflect.Method.invoke(Method.java:498)at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:317)at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:190) at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:157)at net.bull.javamelody.MonitoringSpringInterceptor.invoke(MonitoringSpringInterceptor.java:73)at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:207)at com.sun.proxy.$Proxy136.findKey(Unknown Source)at ec.web.app.service.impl.AppConfigServiceImpl.initCache(AppConfigServiceImpl.java:91)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)

如果无法修改代码添加try…catch，那么只能猜了。将可能有问题的sql，放到mysql客户端里执行一下看看是否有语法错误。

嗯，添加try…catch是个好习惯啊。

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SQLErrorCodes loaded: [DB2, Derby, H2, HSQL, Informix, MS-SQL, MySQL, Oracle, PostgreSQL, Sybase, Ha

前言

分析

解决办法

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