MapReduce 程序mysql JDBC驱动类找不到原因及学习hadoop写入数据到Mysql数据库的方法

lichengcom2009

　　　　　conf.set(DBConfiguration.DRIVER_CLASS_PROPERTY,"com.mysql.jdbc.Driver");　　conf.set(DBConfiguration.URL_PROPERTY,  
"jdbc:mysql://x.x.x.x:3306/test");　　conf.set(DBConfiguration.USERNAME_PROPERTY,
"xxx");　　conf.set(DBConfiguration.PASSWORD_PROPERTY,
"xxxx");　　

//这三行代码是本机测试用的　　

//        conf.set(DBConfiguration.URL_PROPERTY,　　

//        "jdbc:mysql://localhost:3306/test");　　

//        conf.set(DBConfiguration.PASSWORD_PROPERTY, "xxx");　　Job job3 = Job.getInstance(conf,"step3:insertToMySqlDB");
　　job3.setJarByClass(ECMerchantMapReduceV2.class);
　　job3.setMapOutputKeyClass(DBOutputKey.class);
　　job3.setMapOutputValueClass(NullWritable.class);
　　job3.setMapperClass(ECMerchantThirdMap.class);
　　job3.setOutputFormatClass(DBOutputFormat.class);
　　job3.setNumReduceTasks(0);
　　job3.addFileToClassPath(new Path("/xxxx/mysql-connector-java-5.0.3-bin.jar"));
　　DBOutputFormat.setOutput(job3, "yourtablename", "column1","column2","column3","column4");
　　FileInputFormat.addInputPath(job3, new Path(otherArgs[3]));
　　if(!job3.waitForCompletion(true)) return ;