3.5.0版本使用SimpleQuery中的方法之后，数据库连接不释放

### 当前使用版本(必填,否则不予处理)
3.5.0
还使用了druid连接池1.2.8

### 该问题是如何引起的？(确定最新版也有问题再提!!!)
使用SimpleQuery中的方法结束后，未释放数据库连接（连接池最小空闲连接数3，最大5）。
连续调用5次 /user 接口,再次调用会报获取连接超时错误（报错信息在最下面）
![demo接口](https://images.gitee.com/uploads/images/2022/0109/021535_a1b6e3ca_5694139.png "屏幕截图.png")

此时连接池情况：

```
2022-01-09 02:23:43.759  INFO 25128 --- [nio-8080-exec-6] c.a.d.p.DruidDataSourceStatLoggerImpl    : {"url":"jdbc:mysql://ip:port/table?useUnicode=true&characterEncoding=utf-8&useSSL=false&serverTimezone=Asia/Shanghai","dbType":"mysql","name":"DataSource-380216561"," **activeCount** ":5,"activePeak":5,"activePeakTime":"2022-01-09 02:23:42","poolingCount":0,"poolingPeak":3,"poolingPeakTime":"2022-01-09 02:23:32","connectCount":5,"closeCount":0,"notEmptyWaitCount":2,"notEmptyWaitMillis":427,"physicalConnectCount":5,"executeCount":5,"connectionHoldTimeHistogram":[]}
2022-01-09 02:23:55.298  INFO 25128 --- [nio-8080-exec-7] c.a.d.p.DruidDataSourceStatLoggerImpl    : {"url":"jdbc:mysql://ip:port/table?useUnicode=true&characterEncoding=utf-8&useSSL=false&serverTimezone=Asia/Shanghai","dbType":"mysql","name":"DataSource-380216561"," **activeCount** ":5,"poolingCount":0,"connectCount":0,"closeCount":0}
```

多次使用userMapper.selectList(query)无影响。

```
2022-01-09 02:20:59.302  INFO 27348 --- [nio-8080-exec-9] c.a.d.p.DruidDataSourceStatLoggerImpl    : {"url":"jdbc:mysql://ip:port/table?useUnicode=true&characterEncoding=utf-8&useSSL=false&serverTimezone=Asia/Shanghai","dbType":"mysql","name":"DataSource-621486957","activeCount":0,"activePeak":1,"activePeakTime":"2022-01-09 02:20:44","poolingCount":3,"poolingPeak":3,"poolingPeakTime":"2022-01-09 02:20:38","connectCount":14,"closeCount":14,"physicalConnectCount":3,"executeCount":14,"connectionHoldTimeHistogram":[]}
2022-01-09 02:21:29.372  INFO 27348 --- [nio-8080-exec-8] c.a.d.p.DruidDataSourceStatLoggerImpl    : {"url":"jdbc:mysql://ip:port/table?useUnicode=true&characterEncoding=utf-8&useSSL=false&serverTimezone=Asia/Shanghai","dbType":"mysql","name":"DataSource-621486957","activeCount":0,"activePeak":1,"activePeakTime":"2022-01-09 02:21:25","poolingCount":3,"poolingPeak":3,"poolingPeakTime":"2022-01-09 02:21:25","connectCount":11,"closeCount":11,"executeCount":11,"connectionHoldTimeHistogram":[]}
2022-01-09 02:21:43.037  INFO 27348 --- [io-8080-exec-10] c.a.d.p.DruidDataSourceStatLoggerImpl    : {"url":"jdbc:mysql://ip:port/table?useUnicode=true&characterEncoding=utf-8&useSSL=false&serverTimezone=Asia/Shanghai","dbType":"mysql","name":"DataSource-621486957","activeCount":0,"poolingCount":3,"connectCount":0,"closeCount":0}
```

### 报错信息

```
### Error querying database.  Cause: org.springframework.jdbc.CannotGetJdbcConnectionException: Failed to obtain JDBC Connection; nested exception is com.alibaba.druid.pool.GetConnectionTimeoutException: wait millis 10013, active 5, maxActive 5, creating 0
### The error may exist in com/example/mapper/UserMapper.java (best guess)
### The error may involve com.example.mapper.UserMapper.selectList
### The error occurred while executing a query
### Cause: org.springframework.jdbc.CannotGetJdbcConnectionException: Failed to obtain JDBC Connection; nested exception is com.alibaba.druid.pool.GetConnectionTimeoutException: wait millis 10013, active 5, maxActive 5, creating 0] with root cause

com.alibaba.druid.pool.GetConnectionTimeoutException: wait millis 10013, active 5, maxActive 5, creating 0
	at com.alibaba.druid.pool.DruidDataSource.getConnectionInternal(DruidDataSource.java:1775) ~[druid-1.2.8.jar:1.2.8]
	at com.alibaba.druid.pool.DruidDataSource.getConnectionDirect(DruidDataSource.java:1427) ~[druid-1.2.8.jar:1.2.8]
	at com.alibaba.druid.pool.DruidDataSource.getConnection(DruidDataSource.java:1407) ~[druid-1.2.8.jar:1.2.8]
	at com.alibaba.druid.pool.DruidDataSource.getConnection(DruidDataSource.java:1397) ~[druid-1.2.8.jar:1.2.8]
	at com.alibaba.druid.pool.DruidDataSource.getConnection(DruidDataSource.java:100) ~[druid-1.2.8.jar:1.2.8]
	at org.springframework.jdbc.datasource.DataSourceUtils.fetchConnection(DataSourceUtils.java:159) ~[spring-jdbc-5.3.14.jar:5.3.14]
	at org.springframework.jdbc.datasource.DataSourceUtils.doGetConnection(DataSourceUtils.java:117) ~[spring-jdbc-5.3.14.jar:5.3.14]
	at org.springframework.jdbc.datasource.DataSourceUtils.getConnection(DataSourceUtils.java:80) ~[spring-jdbc-5.3.14.jar:5.3.14]
	at org.mybatis.spring.transaction.SpringManagedTransaction.openConnection(SpringManagedTransaction.java:80) ~[mybatis-spring-2.0.6.jar:2.0.6]
	at org.mybatis.spring.transaction.SpringManagedTransaction.getConnection(SpringManagedTransaction.java:67) ~[mybatis-spring-2.0.6.jar:2.0.6]
	at org.apache.ibatis.executor.BaseExecutor.getConnection(BaseExecutor.java:337) ~[mybatis-3.5.9.jar:3.5.9]
	at org.apache.ibatis.executor.SimpleExecutor.prepareStatement(SimpleExecutor.java:86) ~[mybatis-3.5.9.jar:3.5.9]
	at org.apache.ibatis.executor.SimpleExecutor.doQuery(SimpleExecutor.java:62) ~[mybatis-3.5.9.jar:3.5.9]
	at org.apache.ibatis.executor.BaseExecutor.queryFromDatabase(BaseExecutor.java:325) ~[mybatis-3.5.9.jar:3.5.9]
	at org.apache.ibatis.executor.BaseExecutor.query(BaseExecutor.java:156) ~[mybatis-3.5.9.jar:3.5.9]
	at org.apache.ibatis.executor.CachingExecutor.query(CachingExecutor.java:109) ~[mybatis-3.5.9.jar:3.5.9]
	at org.apache.ibatis.executor.CachingExecutor.query(CachingExecutor.java:89) ~[mybatis-3.5.9.jar:3.5.9]
	at org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:151) ~[mybatis-3.5.9.jar:3.5.9]
	at org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:145) ~[mybatis-3.5.9.jar:3.5.9]
	at org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:140) ~[mybatis-3.5.9.jar:3.5.9]
	at com.baomidou.mybatisplus.core.override.MybatisMapperMethod.executeForMany(MybatisMapperMethod.java:166) ~[mybatis-plus-core-3.5.0.jar:3.5.0]
	at com.baomidou.mybatisplus.core.override.MybatisMapperMethod.execute(MybatisMapperMethod.java:77) ~[mybatis-plus-core-3.5.0.jar:3.5.0]
	at com.baomidou.mybatisplus.core.override.MybatisMapperProxy$PlainMethodInvoker.invoke(MybatisMapperProxy.java:148) ~[mybatis-plus-core-3.5.0.jar:3.5.0]
	at com.baomidou.mybatisplus.core.override.MybatisMapperProxy.invoke(MybatisMapperProxy.java:89) ~[mybatis-plus-core-3.5.0.jar:3.5.0]
	at com.sun.proxy.$Proxy64.selectList(Unknown Source) ~[na:na]
	at com.example.controller.MySimpleQuery.group(MySimpleQuery.java:100) ~[classes/:na]
	at com.example.controller.UserController.getUser(UserController.java:29) ~[classes/:na]
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_192]
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:1.8.0_192]
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_192]
	at java.lang.reflect.Method.invoke(Method.java:498) ~[na:1.8.0_192]
	at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:205) ~[spring-web-5.3.14.jar:5.3.14]
	at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:150) ~[spring-web-5.3.14.jar:5.3.14]
	at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:117) ~[spring-webmvc-5.3.14.jar:5.3.14]
	at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:895) ~[spring-webmvc-5.3.14.jar:5.3.14]
	at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:808) ~[spring-webmvc-5.3.14.jar:5.3.14]
	at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:87) ~[spring-webmvc-5.3.14.jar:5.3.14]
	at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1067) ~[spring-webmvc-5.3.14.jar:5.3.14]
	at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:963) ~[spring-webmvc-5.3.14.jar:5.3.14]
	at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1006) ~[spring-webmvc-5.3.14.jar:5.3.14]
	at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:898) ~[spring-webmvc-5.3.14.jar:5.3.14]
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:655) ~[tomcat-embed-core-9.0.56.jar:4.0.FR]
	at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:883) ~[spring-webmvc-5.3.14.jar:5.3.14]
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:764) ~[tomcat-embed-core-9.0.56.jar:4.0.FR]
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:227) ~[tomcat-embed-core-9.0.56.jar:9.0.56]
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162) ~[tomcat-embed-core-9.0.56.jar:9.0.56]
	at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53) ~[tomcat-embed-websocket-9.0.56.jar:9.0.56]
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189) ~[tomcat-embed-core-9.0.56.jar:9.0.56]
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162) ~[tomcat-embed-core-9.0.56.jar:9.0.56]
	at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:100) ~[spring-web-5.3.14.jar:5.3.14]
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:117) ~[spring-web-5.3.14.jar:5.3.14]
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189) ~[tomcat-embed-core-9.0.56.jar:9.0.56]
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162) ~[tomcat-embed-core-9.0.56.jar:9.0.56]
	at org.springframework.web.filter.FormContentFilter.doFilterInternal(FormContentFilter.java:93) ~[spring-web-5.3.14.jar:5.3.14]
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:117) ~[spring-web-5.3.14.jar:5.3.14]
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189) ~[tomcat-embed-core-9.0.56.jar:9.0.56]
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162) ~[tomcat-embed-core-9.0.56.jar:9.0.56]
	at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:201) ~[spring-web-5.3.14.jar:5.3.14]
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:117) ~[spring-web-5.3.14.jar:5.3.14]
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189) ~[tomcat-embed-core-9.0.56.jar:9.0.56]
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162) ~[tomcat-embed-core-9.0.56.jar:9.0.56]
	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:197) ~[tomcat-embed-core-9.0.56.jar:9.0.56]
	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:97) [tomcat-embed-core-9.0.56.jar:9.0.56]
	at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:540) [tomcat-embed-core-9.0.56.jar:9.0.56]
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:135) [tomcat-embed-core-9.0.56.jar:9.0.56]
	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92) [tomcat-embed-core-9.0.56.jar:9.0.56]
	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:78) [tomcat-embed-core-9.0.56.jar:9.0.56]
	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:357) [tomcat-embed-core-9.0.56.jar:9.0.56]
	at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:382) [tomcat-embed-core-9.0.56.jar:9.0.56]
	at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:65) [tomcat-embed-core-9.0.56.jar:9.0.56]
	at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:895) [tomcat-embed-core-9.0.56.jar:9.0.56]
	at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1732) [tomcat-embed-core-9.0.56.jar:9.0.56]
	at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49) [tomcat-embed-core-9.0.56.jar:9.0.56]
	at org.apache.tomcat.util.threads.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1191) [tomcat-embed-core-9.0.56.jar:9.0.56]
	at org.apache.tomcat.util.threads.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:659) [tomcat-embed-core-9.0.56.jar:9.0.56]
	at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) [tomcat-embed-core-9.0.56.jar:9.0.56]
	at java.lang.Thread.run(Thread.java:748) [na:1.8.0_192]

```

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