import org.apache.hadoop.mapred.lib.db.DBOutputFormat; //导入依赖的package包/类
@Override
//Usage DBCountPageView [driverClass dburl]
public int run(String[] args) throws Exception {
  
  String driverClassName = DRIVER_CLASS;
  String url = DB_URL;
  
  if(args.length > 1) {
    driverClassName = args[0];
    url = args[1];
  }
  
  initialize(driverClassName, url);

  JobConf job = new JobConf(getConf(), DBCountPageView.class);
      
  job.setJobName("Count Pageviews of URLs");

  job.setMapperClass(PageviewMapper.class);
  job.setCombinerClass(LongSumReducer.class);
  job.setReducerClass(PageviewReducer.class);

  DBConfiguration.configureDB(job, driverClassName, url);
  
  DBInputFormat.setInput(job, AccessRecord.class, "Access"
      , null, "url", AccessFieldNames);

  DBOutputFormat.setOutput(job, "Pageview", PageviewFieldNames);
  
  job.setMapOutputKeyClass(Text.class);
  job.setMapOutputValueClass(LongWritable.class);

  job.setOutputKeyClass(PageviewRecord.class);
  job.setOutputValueClass(NullWritable.class);

  try {
    JobClient.runJob(job);
    
    boolean correct = verify();
    if(!correct) {
      throw new RuntimeException("Evaluation was not correct!");
    }
  } finally {
    shutdown();    
  }
  return 0;
}
 

import org.apache.hadoop.mapred.lib.db.DBOutputFormat; //导入依赖的package包/类
@Override
//Usage DBCountPageView [driverClass dburl]
public int run(String[] args) throws Exception {

    String driverClassName = DRIVER_CLASS;
    String url = DB_URL;

    if (args.length > 1) {
        driverClassName = args[0];
        url = args[1];
    }

    initialize(driverClassName, url);

    JobConf job = new JobConf(getConf(), DBCountPageView.class);

    job.setJobName("Count Pageviews of URLs");

    job.setMapperClass(PageviewMapper.class);
    job.setCombinerClass(LongSumReducer.class);
    job.setReducerClass(PageviewReducer.class);

    DBConfiguration.configureDB(job, driverClassName, url);

    DBInputFormat.setInput(job, AccessRecord.class, "Access", null, "url", AccessFieldNames);

    DBOutputFormat.setOutput(job, "Pageview", PageviewFieldNames);

    job.setMapOutputKeyClass(Text.class);
    job.setMapOutputValueClass(LongWritable.class);

    job.setOutputKeyClass(PageviewRecord.class);
    job.setOutputValueClass(NullWritable.class);

    try {
        JobClient.runJob(job);

        boolean correct = verify();
        if (!correct) {
            throw new RuntimeException("Evaluation was not correct!");
        }
    } finally {
        shutdown();
    }
    return 0;
}