package test;

import java.util.Date;

import java.util.Random;

import org.hibernate.Session;

import org.hibernate.Transaction;

import com.nxdcms.entity.Student;

import com.nxdcms.entity.UserPerference;

import utils.HibernateUtils;

public class SetPerferenceAtRandom {

public static void main(String[] args) {

Session session = null;

Transaction tx = null;

UserPerference up = null;

int id = 14550000;

try {

session = HibernateUtils.getSession();

tx = session.beginTransaction();

//2000个人 每个人给 80个项目打分 随机打分

Random random = new Random();

for(int i=0;i<2000;i++){

// id = id +1;

int [] rand = randomCommon(1, 81, 45);

for(int j =0;j<45 ;j++){

up = new UserPerference();

up.setStudentId(i+id);

up.setCompetitionId(rand[j]);

up.setPerferences(random.nextInt(6));

up.setTime(new Date());

session.save(up);

}

if(i%100==0){

session.flush();

session.clear();

}

}

tx.commit();

} catch (Exception e) {

e.printStackTrace();

if (tx != null) {

tx.rollback();

}

}

HibernateUtils.closeSession(session);

}

public static int[] randomCommon(int min, int max, int n){

if (n > (max - min + 1) || max < min) {

return null;

}

int[] result = new int[n];

int count = 0;

while(count < n) {

int num = (int) (Math.random() * (max - min)) + min;

boolean flag = true;

for (int j = 0; j < n; j++) {

if(num == result[j]){

flag = false;

break;

}

}

if(flag){

result[count] = num;

count++;

}

}

return result;

}

}