利用log4j的JDBCAppender把日志写入数据库中

log4j提供了多种Appender，通过这些Appender可以把log4j产生的日志写到数据库中，把所用的日志集中起来管理，能够进行日志的分析和集中监控，提升系统的可维护性和系统的可用性，下面是我利用derby嵌入式数据库，写入数据库的配置：

在log4j文件中，增加关于JDBCAppender的配置：

 

 < appender   name = "db"   class = "org.apache.log4j.jdbc.JDBCAppender" >
     < param   name = "driver"   value  = "org.apache.derby.jdbc.EmbeddedDriver"   />
     < param   name = "URL"   value  = "jdbc:derby:logdb;create=true" />
     < param   name = "user"   value  = "" />
     < param   name = "password"   value = "" />
     < param   name = "sql"   value  = "INSERT INTO LOG4J (Date, Logger, Priority, Thread, Message) VALUES ('%d', '%c', '%p', '%t', '%m')" />
 </ appender >

<appender name="db" class="org.apache.log4j.jdbc.JDBCAppender"> <param name="driver" value ="org.apache.derby.jdbc.EmbeddedDriver" /> <param name="URL" value ="jdbc:derby:logdb;create=true"/> <param name="user" value =""/> <param name="password" value=""/> <param name="sql" value ="INSERT INTO LOG4J (Date, Logger, Priority, Thread, Message) VALUES ('%d', '%c', '%p', '%t', '%m')"/> </appender>

数据库为logdb，用户名和密码为空，这两项必须设，因为JDBCAppender中有默认值，如果不设连接数据库会报错。

LOG4J  表的生成SQL语句为：

 create   table  log4j( Date   varchar (100), Logger  varchar (1000), Priority  varchar (100), Thread  varchar (30), Message  varchar (1000));

create table log4j(Date varchar(100), Logger varchar(1000), Priority varchar(100), Thread varchar(30), Message varchar(1000));

然后在log4j.xml配置文件中，把db appender添加到需要的logger中，如下：

 < logger   name  =  "org.tkxing"   additivity  =  "false" >
     < level   value  =  "DEBUG" />
     < appender-ref   ref  =  "logfile" />
     < appender-ref   ref = "stream"   />
     < appender-ref   ref = "db" />
 </ logger >

<logger name = "org.tkxing" additivity = "false"> <level value = "DEBUG"/> <appender-ref ref = "logfile"/> <appender-ref ref="stream" /> <appender-ref ref="db"/> </logger>

 

 < logger   name  =  "org.tkxing"   additivity  =  "false" >
     < level   value  =  "DEBUG" />
     < appender-ref   ref  =  "logfile" />
     < appender-ref   ref = "stream"   />
     < appender-ref   ref = "db" />
 </ logger >

<logger name = "org.tkxing" additivity = "false"> <level value = "DEBUG"/> <appender-ref ref = "logfile"/> <appender-ref ref="stream" /> <appender-ref ref="db"/> </logger>

就可以把日志内容输入到数据库中了。