ssm的报错问题------You must configure either the server or JDBC driver (via the serverTimezone conf)

在测试MySQL数据库连接的过程中，产生的问题。（在ssm项目环境下进行测试，使用idea编辑器其）：

测试MySQL数据库是否连接成功博客：在spring项目中，测试MySQL数据库是否连接成功_qq_41818544的博客-CSDN博客

报错信息：

Fri May 17 14:55:39 CST 2019
There was an unexpected error (type=Internal Server Error, status=500).
nested exception is org.apache.ibatis.exceptions.PersistenceException: ### Error querying database. Cause: org.springframework.jdbc.CannotGetJdbcConnectionException: Failed to obtain JDBC Connection; nested exception is java.sql.SQLSyntaxErrorException: Identifier name 'netsafe&useunicode=true&characterencoding=utf-8&allowmultiqueries=true&usessl=false' is too long ### The error may exist in com/infosec/netsafess/mapper/UserMapper.java (best guess) ### The error may involve com.infosec.netsafess.mapper.UserMapper.getAllUser ### The error occurred while executing a query ### Cause: org.springframework.jdbc.CannotGetJdbcConnectionException: Failed to obtain JDBC Connection; nested exception is java.sql.SQLSyntaxErrorException: Identifier name 'netsafe&useunicode=true&characterencoding=utf-8&allowmultiqueries=true&usessl=false' is too long
org.mybatis.spring.MyBatisSystemException: nested exception is org.apache.ibatis.exceptions.PersistenceException:
### Error querying database.  Cause: org.springframework.jdbc.CannotGetJdbcConnectionException: Failed to obtain JDBC Connection; nested exception is java.sql.SQLSyntaxErrorException: Identifier name 'netsafe&useunicode=true&characterencoding=utf-8&allowmultiqueries=true&usessl=false' is too long
### The error may exist in com/infosec/netsafess/mapper/UserMapper.java (best guess)
### The error may involve com.infosec.netsafess.mapper.UserMapper.getAllUser
### The error occurred while executing a query
### Cause: org.springframework.jdbc.CannotGetJdbcConnectionException: Failed to obtain JDBC Connection; nested exception is java.sql.SQLSyntaxErrorException: Identifier name 'netsafe&useunicode=true&characterencoding=utf-8&allowmultiqueries=true&usessl=false' is too longat org.mybatis.spring.MyBatisExceptionTranslator.translateExceptionIfPossible(MyBatisExceptionTranslator.java:77)at org.mybatis.spring.SqlSessionTemplate$SqlSessionInterceptor.invoke(SqlSessionTemplate.java:446)at com.sun.proxy.$Proxy60.selectList(Unknown Source)at org.mybatis.spring.SqlSessionTemplate.selectList(SqlSessionTemplate.java:230)at org.apache.ibatis.binding.MapperMethod.executeForMany(MapperMethod.java:147)at org.apache.ibatis.binding.MapperMethod.execute(MapperMethod.java:80)at org.apache.ibatis.binding.MapperProxy.invoke(MapperProxy.java:58)at com.sun.proxy.$Proxy64.getAllUser(Unknown Source)at com.infosec.netsafess.service.impl.UserServiceImpl.getAllUser(UserServiceImpl.java:19)at com.infosec.netsafess.controller.HelloController.getAllUser(HelloController.java:25)at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)

启动springboot项目，然后访问数据库，报You must configure either the server or JDBC driver (via the serverTimezone conf）的错误。

原因：

因为安装mysql的时候时区设置的不正确 mysql默认的是美国的时区，而我们中国大陆要比他们迟8小时，采用+8:00格式

使用的数据库是MySQL，从上面图看出SpringBoot2.1在你没有指定MySQL驱动版本的情况下它自动依赖的驱动是8.0.12很高的版本，这是由于数据库和系统时区差异所造成的，在jdbc连接的url后面加上serverTimezone=GMT即可解决问题，如果需要使用gmt+8时区，需要写成GMT%2B8，否则会被解析为空。再一个解决办法就是使用低版本的MySQL jdbc驱动，5.1.28不会存在时区的问题。

加上这个 ?serverTimezone=UTC

spring.datasource.url=jdbc:mysql://localhost:3306/blog?serverTimezone=UTC

例如：

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ssm的报错问题------You must configure either the server or JDBC driver (via the serverTimezone conf)

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