pig 自定义函数和在eclipse里运行

package pig;

import java.io.IOException;

import org.apache.pig.EvalFunc;
import org.apache.pig.data.Tuple;

public class Upper extends EvalFunc<String> {

  @Override
  public String exec(Tuple input) throws IOException {
    if(input==null||input.size()==0){
      return null;
    }
    String str=(String)input.get(0);
    return str.toUpperCase();
  }

}

package pig;

import org.apache.pig.PigServer;

public class PigClient {

  public static void main(String[] args) throws Exception{
    PigServer pigServer=new PigServer("mapreduce");
    pigServer.registerQuery("A =load '/pig/student.txt' using PigStorage(':') as (sno:int,sname:chararray,ssex:chararray,sage:int,sdepartment:chararray);");
    pigServer.registerQuery(" B =foreach A generate sname;");
    pigServer.store("B", "/pig/client");
  }

}

在eclipse运行pig，需要hadoop相关配置文件