我目前正在开发我的 Spring 项目以创建简单的库门户（仅用于教育目的）。现在我正在努力使用 Log4j2 JDBCAppender 将一些操作记录到 MySQL 数据库中。
为此，我使用查询在我的数据库中创建了表：
CREATE TABLE user_logs (
`id` int(12) NOT NULL AUTO_INCREMENT,
`level` varchar(10) NOT NULL,
`dated` TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
`username` varchar(64) NOT NULL,
`field` varchar(60) NOT NULL,
`from` varchar(1000) NOT NULL DEFAULT '',
`to` varchar(1000) NOT NULL DEFAULT '',
`message` varchar(500) NOT NULL,
PRIMARY KEY (`id`),
KEY `user` (`username`),
CONSTRAINT `FK_USERNAME` FOREIGN KEY (`username`)
REFERENCES `user` (`username`)
ON DELETE NO ACTION ON UPDATE NO ACTION
)ENGINE=InnoDB DEFAULT CHARSET=utf8;
在数据库中，我想存储信息，修改了哪些字段，从哪个字段更改了哪个值。日志还将包含发生更改的用户的信息。
然后我创建了 Log4j2 XML 配置文件：
<?xml version="1.0" encoding="UTF-8"?>
<Configuration name="ChangesLogs">
<Appenders>
<Console name="consoleAppender" target="SYSTEM_OUT">
<PatternLayout pattern="%d | %level | %logger | %m" />
</Console>
<JDBC name="userAppenderDB" tableName="user_logs">
<ConnectionFactory class="com.wkrzywiec.spring.library.config.LogsConnectionFactory" method="getDatabaseConnection" />
<Column name="level" pattern="%level"/>
<Column name="username" pattern="%X{username}"/>
<Column name="field" pattern="%X{field}"/>
<Column name="from" pattern="%X{from}"/>
<Column name="to" pattern="%X{to}"/>
<Column name="message" pattern="%message"/>
</JDBC>
</Appenders>
<Loggers>
<Root level="debug">
<AppenderRef ref="consoleAppender" />
</Root>
<Logger name="userLoggerDB" >
<AppenderRef ref="consoleAppender" />
<AppenderRef ref="userAppenderDB" />
</Logger>
</Loggers>
JDBCAppender 连接池的类：
package com.wkrzywiec.spring.library.config;
import java.sql.Connection;
import java.sql.SQLException;
import java.util.Properties;
import javax.sql.DataSource;
import org.apache.commons.dbcp.DriverManagerConnectionFactory;
import org.apache.commons.dbcp.PoolableConnection;
import org.apache.commons.dbcp.PoolableConnectionFactory;
import org.apache.commons.dbcp.PoolingDataSource;
import org.apache.commons.pool.impl.GenericObjectPool;
import org.springframework.stereotype.Component;
@Component
public class LogsConnectionFactory {
private static interface Singleton {
final LogsConnectionFactory INSTANCE = new LogsConnectionFactory();
}
private final DataSource dataSource;
private String datasourceURL = "jdbc:mysql://localhost:3306/library_db?autoReconnect=true&useSSL=false&useUnicode=true&useJDBCCompliantTimezoneShift=true&useLegacyDatetimeCode=false&serverTimezone=UTC";
private String userName = "library-spring";
private String pass = "library-spring";
private LogsConnectionFactory() {
Properties properties = new Properties();
properties.setProperty("user", userName);
properties.setProperty("password", pass);
GenericObjectPool<PoolableConnection> pool = new GenericObjectPool<PoolableConnection>();
DriverManagerConnectionFactory connectionFactory = new DriverManagerConnectionFactory(
datasourceURL, properties);
new PoolableConnectionFactory(connectionFactory, pool, null, "SELECT 1", 3, false, false, Connection.TRANSACTION_READ_COMMITTED);
this.dataSource = new PoolingDataSource(pool);
}
public static Connection getDatabaseConnection() throws SQLException {
return Singleton.INSTANCE.dataSource.getConnection();
}
}
最后，当我在服务类中使用以下代码保存新用户时：
@Override
public void saveReaderUser(UserDTO user) {
com.wkrzywiec.spring.library.entity.User userEntity = convertUserDTOtoUserEntity(user);
userDAO.saveUser(userEntity);
ThreadContext.put("username", user.getUsername());
ThreadContext.put("field", "ALL");
ThreadContext.put("from", "");
ThreadContext.put("to", user.toString());
userLogger.info("New user");
ThreadContext.clearAll();
}
我有这个错误（只是为了说清楚，这个错误仅用于添加日志，用户已成功保存在数据库中）：
Caused by: java.sql.BatchUpdateException: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'from,to,message) VALUES ('INFO','wojtek21','ALL','','UserDTO [username=wojtek21,' at line 1
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
at com.mysql.cj.core.util.Util.handleNewInstance(Util.java:185)
at com.mysql.cj.core.util.Util.getInstance(Util.java:168)
at com.mysql.cj.core.util.Util.getInstance(Util.java:175)
at com.mysql.cj.jdbc.exceptions.SQLError.createBatchUpdateException(SQLError.java:636)
at com.mysql.cj.jdbc.PreparedStatement.executeBatchSerially(PreparedStatement.java:1734)
at com.mysql.cj.jdbc.PreparedStatement.executeBatchInternal(PreparedStatement.java:1217)
at com.mysql.cj.jdbc.StatementImpl.executeBatch(StatementImpl.java:1009)
at org.apache.commons.dbcp.DelegatingStatement.executeBatch(DelegatingStatement.java:297)
at org.apache.commons.dbcp.DelegatingStatement.executeBatch(DelegatingStatement.java:297)
at org.apache.logging.log4j.core.appender.db.jdbc.JdbcDatabaseManager.commitAndClose(JdbcDatabaseManager.java:172)
... 59 more
Caused by: java.sql.SQLSyntaxErrorException: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'from,to,message) VALUES ('INFO','wojtek21','ALL','','UserDTO [username=wojtek21,' at line 1
at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:536)
at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:513)
at com.mysql.cj.jdbc.exceptions.SQLExceptionsMapping.translateException(SQLExceptionsMapping.java:115)
at com.mysql.cj.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:1983)
at com.mysql.cj.jdbc.PreparedStatement.executeInternal(PreparedStatement.java:1826)
at com.mysql.cj.jdbc.PreparedStatement.executeUpdateInternal(PreparedStatement.java:2034)
at com.mysql.cj.jdbc.PreparedStatement.executeBatchSerially(PreparedStatement.java:1712)
... 64 more
2018-03-04 10:07:44,726 http-bio-8080-exec-7 ERROR An exception occurred processing Appender userAppenderDB org.apache.logging.log4j.core.appender.AppenderLoggingException: Failed to commit transaction logging event or flushing buffer.
at org.apache.logging.log4j.core.appender.db.jdbc.JdbcDatabaseManager.commitAndClose(JdbcDatabaseManager.java:177)
at org.apache.logging.log4j.core.appender.db.AbstractDatabaseManager.write(AbstractDatabaseManager.java:174)
at org.apache.logging.log4j.core.appender.db.AbstractDatabaseAppender.append(AbstractDatabaseAppender.java:108)
at org.apache.logging.log4j.core.config.AppenderControl.tryCallAppender(AppenderControl.java:156)
at org.apache.logging.log4j.core.config.AppenderControl.callAppender0(AppenderControl.java:129)
at org.apache.logging.log4j.core.config.AppenderControl.callAppenderPreventRecursion(AppenderControl.java:120)
at org.apache.logging.log4j.core.config.AppenderControl.callAppender(AppenderControl.java:84)
at org.apache.logging.log4j.core.config.LoggerConfig.callAppenders(LoggerConfig.java:448)
at org.apache.logging.log4j.core.config.LoggerConfig.processLogEvent(LoggerConfig.java:433)
at org.apache.logging.log4j.core.config.LoggerConfig.log(LoggerConfig.java:417)
at org.apache.logging.log4j.core.config.LoggerConfig.log(LoggerConfig.java:403)
at org.apache.logging.log4j.core.config.AwaitCompletionReliabilityStrategy.log(AwaitCompletionReliabilityStrategy.java:63)
at org.apache.logging.log4j.core.Logger.logMessage(Logger.java:146)
at org.apache.logging.log4j.spi.AbstractLogger.tryLogMessage(AbstractLogger.java:2163)
at org.apache.logging.log4j.spi.AbstractLogger.logMessageTrackRecursion(AbstractLogger.java:2118)
at org.apache.logging.log4j.spi.AbstractLogger.logMessageSafely(AbstractLogger.java:2101)
at org.apache.logging.log4j.spi.AbstractLogger.logMessage(AbstractLogger.java:1995)
at org.apache.logging.log4j.spi.AbstractLogger.logIfEnabled(AbstractLogger.java:1967)
at org.apache.logging.log4j.spi.AbstractLogger.info(AbstractLogger.java:1304)
at com.wkrzywiec.spring.library.service.LibraryUserDetailService.saveReaderUser(LibraryUserDetailService.java:86)
at com.wkrzywiec.spring.library.controller.LoginController.processRegisterForm(LoginController.java:58)
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.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:209)
at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:136)
at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:102)
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:871)
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:777)
at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:87)
at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:991)
at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:925)
at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:978)
at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:881)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:648)
at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:855)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:292)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207)
at org.springframework.security.web.FilterChainProxy.doFilterInternal(FilterChainProxy.java:209)
at org.springframework.security.web.FilterChainProxy.doFilter(FilterChainProxy.java:178)
at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:357)
at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:270)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:240)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:212)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:94)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:504)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:141)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:88)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:502)
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1132)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:684)
at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:283)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.lang.Thread.run(Thread.java:748)
Caused by: java.sql.BatchUpdateException: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'from,to,message) VALUES ('INFO','wojtek21','ALL','','UserDTO [username=wojtek21,' at line 1
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
at com.mysql.cj.core.util.Util.handleNewInstance(Util.java:185)
at com.mysql.cj.core.util.Util.getInstance(Util.java:168)
at com.mysql.cj.core.util.Util.getInstance(Util.java:175)
at com.mysql.cj.jdbc.exceptions.SQLError.createBatchUpdateException(SQLError.java:636)
at com.mysql.cj.jdbc.PreparedStatement.executeBatchSerially(PreparedStatement.java:1734)
at com.mysql.cj.jdbc.PreparedStatement.executeBatchInternal(PreparedStatement.java:1217)
at com.mysql.cj.jdbc.StatementImpl.executeBatch(StatementImpl.java:1009)
at org.apache.commons.dbcp.DelegatingStatement.executeBatch(DelegatingStatement.java:297)
at org.apache.commons.dbcp.DelegatingStatement.executeBatch(DelegatingStatement.java:297)
at org.apache.logging.log4j.core.appender.db.jdbc.JdbcDatabaseManager.commitAndClose(JdbcDatabaseManager.java:172)
... 59 more
Caused by: java.sql.SQLSyntaxErrorException: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'from,to,message) VALUES ('INFO','wojtek21','ALL','','UserDTO [username=wojtek21,' at line 1
at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:536)
at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:513)
at com.mysql.cj.jdbc.exceptions.SQLExceptionsMapping.translateException(SQLExceptionsMapping.java:115)
at com.mysql.cj.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:1983)
at com.mysql.cj.jdbc.PreparedStatement.executeInternal(PreparedStatement.java:1826)
at com.mysql.cj.jdbc.PreparedStatement.executeUpdateInternal(PreparedStatement.java:2034)
at com.mysql.cj.jdbc.PreparedStatement.executeBatchSerially(PreparedStatement.java:1712)
... 64 more
我尝试了很多方法来解决它（检查错字、其他配置、sql 表中的数据类型等），但没有成功。从错误消息看来，这是 SQL 插入查询的问题，但我不知道如何修复它，因为它是由 Log4j2 生成的。你知道我做错了什么吗？
我非常感谢您的支持。
非常感谢！