我使用以下代码来获取使用log4j的数据库记录器。
PatternLayout layout = new PatternLayout();
JDBCAppender jdbcAppender = new JDBCAppender();
jdbcAppender.setDriver(jdbc);
jdbcAppender.setUser(user);
jdbcAppender.setPassword(password);
jdbcAppender.setURL(url);
jdbcAppender
.setSql("INSERT INTO " + logTable + " VALUES('%x', '%d', '%C', '%p', '%m')");
jdbcAppender.setLayout(layout);
jdbcAppender.activateOptions();
Logger rootLogger = Logger.getRootLogger();
rootLogger.setLevel(Level.DEBUG);
rootLogger.addAppender(jdbcAppender);
Logger logger = Logger.getLogger(type);
记录抛出异常：
logger.info("This is log");
log4j:ERROR Failed to excute sql
java.sql.SQLException: Incorrect syntax near the keyword 'is'.
at net.sourceforge.jtds.jdbc.SQLDiagnostic.addDiagnostic(SQLDiagnostic.java:372)
at net.sourceforge.jtds.jdbc.TdsCore.tdsErrorToken(TdsCore.java:2988)
at net.sourceforge.jtds.jdbc.TdsCore.nextToken(TdsCore.java:2421)
at net.sourceforge.jtds.jdbc.TdsCore.getMoreResults(TdsCore.java:671)
at net.sourceforge.jtds.jdbc.JtdsStatement.processResults(JtdsStatement.java:613)
at net.sourceforge.jtds.jdbc.JtdsStatement.executeSQL(JtdsStatement.java:572)
at net.sourceforge.jtds.jdbc.JtdsStatement.executeImpl(JtdsStatement.java:809)
at net.sourceforge.jtds.jdbc.JtdsStatement.executeUpdate(JtdsStatement.java:1288)
at net.sourceforge.jtds.jdbc.JtdsStatement.executeUpdate(JtdsStatement.java:1241)
at org.apache.log4j.jdbc.JDBCAppender.execute(JDBCAppender.java:218)
at org.apache.log4j.jdbc.JDBCAppender.flushBuffer(JDBCAppender.java:289)
at org.apache.log4j.jdbc.JDBCAppender.append(JDBCAppender.java:186)
at org.apache.log4j.AppenderSkeleton.doAppend(AppenderSkeleton.java:251)
at org.apache.log4j.helpers.AppenderAttachableImpl.appendLoopOnAppenders(AppenderAttachableImpl.java:66)
at org.apache.log4j.Category.callAppenders(Category.java:206)
at org.apache.log4j.Category.forcedLog(Category.java:391)
at org.apache.log4j.Category.info(Category.java:666)
at com.nirvasoft.logging.Main.main(Main.java:20)
可能导致错误的原因是什么？