显示iBATIS执行的SQL语句的方法
使用log4j，修改log4j的配置文件，配置如下内容：
# Set root logger level to DEBUG and its only appender to CONSOLE.log4j.rootLogger=WARN,CONSOLE# CONSOLElog4j.appender.CONSOLE=org.apache.log4j.ConsoleAppenderlog4j.appender.stdout=org.apache.log4j.ConsoleAppenderlog4j.appender.CONSOLE.layout=org.apache.log4j.PatternLayoutlog4j.appender.stdout.layout.ConversionPattern=%d %p [%c] - %m%nlog4j.appender.stdout.layout=org.apache.log4j.PatternLayoutlog4j.appender.CONSOLE.Threshold=INFOlog4j.logger.com.ibatis=debuglog4j.logger.com.ibatis.common.jdbc.SimpleDataSource=debuglog4j.logger.com.ibatis.common.jdbc.ScriptRunner=debuglog4j.logger.com.ibatis.sqlmap.engine.impl.SqlMapClientDelegate=debuglog4j.logger.java.sql.Connection=debuglog4j.logger.java.sql.Statement=debuglog4j.logger.java.sql.PreparedStatement=debug,stdout
