hibernate中hql语句的基本使用

package com.tudou.hibernates.t1;

import java.util.List;

import org.hibernate.Query;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.Transaction;
import org.hibernate.cfg.Configuration;

public class TestGetHql {
 private static Configuration cfg = new Configuration().configure();
 private static SessionFactory fac = cfg.buildSessionFactory();
 private static Session son = fac.openSession();

 // hql普通查询 Card为类名，不是表名，可以写全路径
 public static void from() {
  String hql = "from Card";
  Query query = son.createQuery(hql);
  List<Card> cards = query.list();
  for (Card c : cards) {
   System.out.println(c.getCardName());
   System.out.println(c.getCreateDate());
  }
 }

 // 条件查询 where
 public static void where() {
  String hql = "from Card where cardName='三国无双'";
  Query query = son.createQuery(hql);
  List<Card> cardss = query.list();
  for (Card c : cardss) {
   System.out.println(c.getCardName());
   System.out.println(c.getCreateDate());
  }
 }

 // 模糊查询 like
 public static void like() {
  String hql = "from Card where cardName like '%世%'";
  Query query = son.createQuery(hql);
  List<Card> cards = query.list();
  for (Card c : cards) {
   System.out.println(c.getCardName());
   System.out.println(c.getCreateDate());
  }
 }

 // 逻辑条件查询 >
 public static void gt() {
  String hql = "from Card c where c.createDate >'2011-08-08'";
  Query query = son.createQuery(hql);
  List<Card> cards = query.list();
  for (Card c : cards) {
   System.out.println(c.getCardName());
   System.out.println(c.getCreateDate());
  }
 }

 // 逻辑条件查询 between and 此处用了别名，省略了as关键字
 public static void between() {
  String hql = "from Card c where c.createDate between '2011-08-08' and '2022-11-11'";
  Query query = son.createQuery(hql);
  List<Card> cards = query.list();
  for (Card c : cards) {
   System.out.println(c.getCardName());
   System.out.println(c.getCreateDate());
  }
 }

 // 逻辑多条件查询and
 public static void and() {
  String hql = "from Card c where c.createDate between '2011-01-08' and '2022-11-11' and c.cardName like '%世%'";
  Query query = son.createQuery(hql);
  List<Card> cards = query.list();
  for (Card c : cards) {
   System.out.println(c.getCardName());
   System.out.println(c.getCreateDate());
  }
 }

 // update 更新
 public static void update() {
  String hql = "update Card as c set c.createDate='2011-03-03' where c.cardType.cardTypeId=3";
  Query query = son.createQuery(hql);
  int num = query.executeUpdate();
  System.out.println(num + "行被更新。。。");
 }

 // delete删除
 public static void delete() {
  String hql = "delete from  Card as c where c.createDate='2011-03-04'";
  Query query = son.createQuery(hql);
  int num = query.executeUpdate();
  System.out.println(num + "行被删除。。。");
 }

 // 单个属性查询
 public static void simpleProperty() {
  String hql = "select c.cardName from  Card as c where c.cardType.cardTypeId=1";
  Query query = son.createQuery(hql);
  List<String> name = query.list();
  for (String s : name) {
   System.out.println(s);
  }
 }

 // 多个属性查询 其中cardTypeName直接通过card对象的cardType对象获得，省去了使用普通的sql语句必须多表连接查询的麻烦
 public static void mulProperty() {
  String hql = "select c.cardName,c.cardType.cardTypeName,c.createDate from  Card as c where c.cardType.cardTypeId=1";
  Query query = son.createQuery(hql);
  List<Object[]> obj = query.list();
  for (Object[] o : obj) {
   System.out.println(o[0] + "\t" + o[1] + "\t" + o[2]);
  }
 }

 // 多个属性查询 面向对象方式
 public static void orientedObject() {
  String hql = "select new Card(c.cardName,c.createDate) from  Card as c";
  Query query = son.createQuery(hql);
  List<Card> cards = query.list();
  for (Card c : cards) {
   System.out.println(c.getCardName() + "\t" + c.getCreateDate());
  }
 }

 // 函数查询
 public static void function() {
  String hql = "select count(*),max(c.createDate) from  Card as c";
  Query query = son.createQuery(hql);
  List<Object[]> oo = query.list();
  for (Object[] o : oo) {
   System.out.println("总记录数：" + o[0] + "\t最新日期为：" + o[1]);
  }
 }

 // 排序
 public static void orderBy() {
  String hql = "from  Card as c order by c.createDate desc";
  Query query = son.createQuery(hql);
  List<Card> cards = query.list();
  for (Card c : cards) {
   System.out.println(c.getCardName() + "\t" + c.getCreateDate());
  }
 }

 // 分组
 public static void groupBy() {
  String hql = "from  Card as c group by c.cardType.cardTypeId";
  Query query = son.createQuery(hql);
  List<Card> cards = query.list();
  for (Card c : cards) {
   System.out.println(c.getCardName() + "\t" + c.getCreateDate());
  }
 }

 // 单个对象查询 呵呵，奇怪吧，对象可以查询出来
 public static void simpleObject() {
  String hql = "select c.cardType from  Card as c";
  Query query = son.createQuery(hql);
  query.setMaxResults(1);// 必须在查询之前指定，使其返回单个对象
  CardType cardType1 = (CardType) query.uniqueResult();
  System.out.println(cardType1.getCardTypeName() + "\t"
    + cardType1.getCreateDate());
 }

 // 按照命令行参数 格式为： :参数名
 public static void parameter() {
  String hql = "select c.cardType from  Card as c where c.cardType.cardTypeId=:id";
  Query query = son.createQuery(hql);
  query.setParameter("id", 1);
  query.setMaxResults(1);// 必须在查询之前指定，使其返回单个对象
  CardType cardType = (CardType) query.uniqueResult();
  System.out.println(cardType.getCardTypeName() + "\t"
    + cardType.getCreateDate());
 }

 // 按照参数位置 从0开始
 public static void parameterPosition() {
  String hql = "select c.cardType from  Card as c where c.cardType.cardTypeId=?";
  Query query = son.createQuery(hql);
  query.setParameter(0, 1);
  query.setMaxResults(1);// 必须在查询之前指定，使其返回单个对象
  CardType cardType = (CardType) query.uniqueResult();
  System.out.println(cardType.getCardTypeName() + "\t"
    + cardType.getCreateDate());
 }

 // 多个参数
 public static void mulParameter() {
  String hql = "from  Card as c where c.cardType.cardTypeId in (3,2)";
  Query query = son.createQuery(hql);
  // query.setParameterList("id", new Object[]{1,2});
  List<Card> cards = query.list();
  for (Card o : cards) {
   System.out.println(o.getCardName());
  }
 }

 // inner join 查询结果为多个对象的集合
 public static void innerJoin() {
  String hql = "from  Card as c inner join c.cardType";
  Query query = son.createQuery(hql);
  List<Object[]> cards = query.list();
  for (Object[] o : cards) {
   System.out.println(((Card) o[0]).getCardName() + "\t"
     + ((CardType) o[1]).getCreateDate());
  }
 }

 // leftJoin 查询结果为多个对象的集合
 public static void leftJoin() {
  String hql = "from  CardType as c left join c.cards";
  Query query = son.createQuery(hql);
  List<Object[]> cards = query.list();
  for (Object[] o : cards) {
   // 由于保存卡片时在多的一方card进行操作，使用了级联。但手动插入的cardType可能没有相应的卡片
   if (o[1] != null) {// 当卡片不为空时
    System.out.println(((CardType) o[0]).getCardTypeName() + "\t"
      + ((Card) o[1]).getCardName());
   } else {
    System.out.println(((CardType) o[0]).getCardTypeName()
      + "\t没有相应的卡片");
   }
  }
 }

 // rightJoin 查询结果为多个对象的集合
 public static void rightJoin() {
  String hql = "from  CardType as c right join c.cards";
  Query query = son.createQuery(hql);
  List<Object[]> cards = query.list();
  // 插入时保证了每张卡片的类型，所以此处不用判断卡片类型是否为空
  for (Object[] o : cards) {
   System.out.println(((CardType) o[0]).getCardTypeName() + "\t"
     + ((Card) o[1]).getCardName());
  }
 }

 // 使用子查询
 public static void childSelect() {
  String hql = "from  CardType as c where (select count(*) from c.cards)>0";
  Query query = son.createQuery(hql);
  List<CardType> cards = query.list();
  for (CardType c : cards) {
   System.out.println(c.getCardTypeName() + "\t" + c.getCreateDate());
  }
 }

 // 程序入口
 public static void main(String[] args) {
  // 测试方法
  Transaction tr = son.beginTransaction();

  // update();
  mulParameter();
  tr.commit();
  son.close();
  fac.close();
 }
}