關於Hibernate配置及資料庫訪問過程中報錯及解決辦法
阿新 • • 發佈：2019-01-08
使用Hibernate對MySQL資料庫中的表資料進行增刪改查操作過程中出現的問題及解決辦法：
1. 缺少日誌檔案配置。
解決辦法：首先確認是否添加了log4j-**.jar和self4j-log4j****.jar包，然後在src下新增log4j.properties檔案，其內容
log4j.rootLogger = debug,stdout,D,E log4j.appender.stdout = org.apache.log4j.ConsoleAppender log4j.appender.stdout.Target = System.out log4j.appender.stdout.layout = org.apache.log4j.PatternLayout log4j.appender.stdout.layout.ConversionPattern = [%-5p] %d{yyyy-MM-dd HH:mm:ss,SSS} method:%l%n%m%n log4j.appender.D = org.apache.log4j.DailyRollingFileAppender log4j.appender.D.File = E://logs/log.log log4j.appender.D.Append = true log4j.appender.D.Threshold = DEBUG log4j.appender.D.layout = org.apache.log4j.PatternLayout log4j.appender.D.layout.ConversionPattern = %-d{yyyy-MM-dd HH:mm:ss} [ %t:%r ] - [ %p ] %m%n log4j.appender.E = org.apache.log4j.DailyRollingFileAppender log4j.appender.E.File =E://logs/error.log log4j.appender.E.Append = true log4j.appender.E.Threshold = ERROR log4j.appender.E.layout = org.apache.log4j.PatternLayout log4j.appender.E.layout.ConversionPattern = %-d{yyyy-MM-dd HH:mm:ss} [ %t:%r ] - [ %p ] %m%n
2. 上述問題解決後，測試報錯
[WARN ] 2018-06-20 20:31:53,543 method:org.hibernate.cfg.SettingsFactory.buildSettings(SettingsFactory.java:147) Could not obtain connection to query metadata java.sql.SQLException: Unknown system variable 'tx_isolation' at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:946) at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:2985) at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:1631) at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:1723) at com.mysql.jdbc.Connection.execSQL(Connection.java:3277) at com.mysql.jdbc.Connection.execSQL(Connection.java:3206) at com.mysql.jdbc.Statement.executeQuery(Statement.java:1232) at com.mysql.jdbc.Connection.getTransactionIsolation(Connection.java:3854) at org.hibernate.connection.DriverManagerConnectionProvider.getConnection(DriverManagerConnectionProvider.java:138) at org.hibernate.cfg.SettingsFactory.buildSettings(SettingsFactory.java:113) at org.hibernate.cfg.Configuration.buildSettingsInternal(Configuration.java:2863) at org.hibernate.cfg.Configuration.buildSettings(Configuration.java:2859) at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1870) at cn.itcast.test.CustomerTest.insertTest(CustomerTest.java:24) 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:483) at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:45) at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15) at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:42) at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:20) at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:263) at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:68) at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:47) at org.junit.runners.ParentRunner$3.run(ParentRunner.java:231) at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:60) at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:229) at org.junit.runners.ParentRunner.access$000(ParentRunner.java:50) at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:222) at org.junit.runners.ParentRunner.run(ParentRunner.java:300) at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:50) at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197)
我所使用的MySQL版本為mysql8.0.11而所使用的驅動版本為mysql-connector-java-5.0.8-bin.jar，接著升級使用mysql-connector-java-8.0.11.jar，並修改hibernate.cfg.xml檔案中的一些配置
<!--連線資料庫的url -->
<property name="hibernate.connection.url">
jdbc:mysql://localhost:3306/hibernate?useSSL=false&serverTimezone=UTC
</property>問題得到解決，以下為對customer表增刪改查操作效果。
增：
改：
刪：
誠摯感謝以下幾位大神部落格指路：