log4j 记录日志放在oracle中

一个db类 类似于jdbc的驱动和链接配置
  package com.assi;
import org.apache.log4j.jdbc.JDBCAppender;
public class DB extends JDBCAppender {
     public DB(){
         this.setDriver("oracle.jdbc.driver.OracleDriver"); 
         this.setURL("jdbc:oracle:thin:@172.18.220.10:1521:orcl"); 
         this.setUser("log"); 
         this.setPassword("log");
     }
}
具体写日志的类 //没有注释 代码比较简单
package com.assi;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.Date;
import org.apache.log4j.Level;
import org.apache.log4j.Logger;
public class CataLogs extends DB {
    private DateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss:SSS");
    private Logger logger;
    public CataLogs(){
        logger=Logger.getLogger(CataLogs.class.getName());
       
    }
    //自动执行的
    protected void execute(String sql){
        Connection con=null;
        PreparedStatement stmt=null;
        try{
            con=getConnection();
            stmt=con.prepareStatement(this.getSql());
            stmt.execute();
        }
        catch(Exception e){
            e.printStackTrace();
     &