這里寫目錄標題

• 前言
• 源碼
• 遇到錯誤 `java.sql.SQLException: Connection is closed`
• 錯誤原因
• 解決辦法
• 修改后的源碼

前言

• springboot 2.1.1.RELEASE

源碼

@Repository public class TestDao {@Autowiredprivate SqlSessionTemplate sqlSessionTemplate;public void printSysConfig() {String sql = "select * from sys_config";try (Connection conn = this.sqlSessionTemplate.getConnection();PreparedStatement ps = conn.prepareStatement(sql);) {ResultSet rs = ps.executeQuery();int cols = rs.getMetaData().getColumnCount();while (rs.next()) {for (int i=1;i<=cols;i++) {System.out.print(rs.getString(i));System.out.print(",");}System.out.println();}} catch (Exception e) {e.printStackTrace();}} }

遇到錯誤 java.sql.SQLException: Connection is closed

java.sql.SQLException: Connection is closedat com.zaxxer.hikari.pool.ProxyConnection$ClosedConnection.lambda$getClosedConnection$0(ProxyConnection.java:515)at com.sun.proxy.$Proxy50.prepareStatement(Unknown Source)at com.zaxxer.hikari.pool.ProxyConnection.prepareStatement(ProxyConnection.java:337)at com.zaxxer.hikari.pool.HikariProxyConnection.prepareStatement(HikariProxyConnection.java)at com.ymyun.samples.TestDao.printSysConfig(TestDao.java:40)at com.ymyun.samples.TestDao$$FastClassBySpringCGLIB$$20d8ee9.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.dao.support.PersistenceExceptionTranslationInterceptor.invoke(PersistenceExceptionTranslationInterceptor.java:139)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 com.ymyun.samples.TestDao$$EnhancerBySpringCGLIB$$1cf3f5d2.printSysConfig(<generated>)at com.ymyun.samples.YmyunSamplesApplication.lambda$0(YmyunSamplesApplication.java:45)at org.springframework.boot.SpringApplication.callRunner(SpringApplication.java:784)at org.springframework.boot.SpringApplication.callRunners(SpringApplication.java:768)at org.springframework.boot.SpringApplication.run(SpringApplication.java:322)at org.springframework.boot.SpringApplication.run(SpringApplication.java:1226)at org.springframework.boot.SpringApplication.run(SpringApplication.java:1215)at com._3jcf.ymyun.samples.YmyunSamplesApplication.main(YmyunSamplesApplication.java:38)

錯誤原因

參考
https://www.cnblogs.com/Zhongzz/p/9407639.html

解決辦法

使用下面的方法獲取Connection：

SqlSessionTemplate st = (SqlSessionTemplate) getSqlSession();Connection connection = SqlSessionUtils.getSqlSession(st.getSqlSessionFactory(), st.getExecutorType(),st.getPersistenceExceptionTranslator()).getConnection();

修改后的源碼

@Repository public class TestDao {@Autowiredprivate SqlSessionTemplate sqlSessionTemplate;public void printSysConfig() {String sql = "select * from sys_config";try (Connection conn = this.getConnection();PreparedStatement ps = conn.prepareStatement(sql);) {ResultSet rs = ps.executeQuery();int cols = rs.getMetaData().getColumnCount();while (rs.next()) {for (int i=1;i<=cols;i++) {System.out.print(rs.getString(i));System.out.print(",");}System.out.println();}} catch (Exception e) {e.printStackTrace();}}private Connection getConnection() {SqlSessionTemplate st = this.sqlSessionTemplate;Connection connection = SqlSessionUtils.getSqlSession(st.getSqlSessionFactory(), st.getExecutorType(),st.getPersistenceExceptionTranslator()).getConnection();return connection;} }

總結

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