ibatis控制台输出SQL语句：调试代码的时候，会希望在控制台打印正在执行的SQL语句，这样就知道哪些SQL语句有问题。只要在
log4j.properties文件里加上下面的配置，就可以在控制台打印SQL语句了。
log4j.rootLogger=DEBUG, stdout, fileout     log4j.logger.com.fiscal = DEBUG     log4j.logger.com.system = DEBUG     log4j.logger.com.ibatis = DEBUG     log4j.logger.com.ibatis.common.jdbc.SimpleDataSource = DEBUG     log4j.logger.com.ibatis.common.jdbc.ScriptRunner = DEBUG     log4j.logger.com.ibatis.sqlmap.engine.impl.SqlMapClientDelegate = DEBUG     log4j.logger.java.sql.Connection = DEBUG     log4j.logger.java.sql.ResultSet = DEBUG    log4j.logger.java.sql.PreparedStatement=DEBUG   log4j.appender.stdout=org.apache.log4j.ConsoleAppender      log4j.appender.fileout=org.apache.log4j.RollingFileAppender     log4j.appender.fileout.File=C:\\ibatis.log      log4j.appender.fileout.MaxFileSize=10000KB      log4j.appender.stdout.layout=org.apache.log4j.PatternLayout      log4j.appender.stdout.layout.ConversionPattern=[%-5p] %d{yyyy-MM-dd HH:mm:ss} :%m%n      log4j.appender.fileout.layout=org.apache.log4j.PatternLayout      log4j.appender.fileout.layout.ConversionPattern=[%-5p]_%d{yyyy-MM-dd HH:mm:ss} :%m%n