Hibernate5和4对原生SQL语句的查询方法是不一样的,今天在网上找了一些实用的例子,给大家分享一下。
1,获取所有的Order对象,得到一个List集合
@Test
public void list(){
String sql = "select * from orders";
NativeQuery<Order> query = session.createNativeQuery(sql, Order.class);
List<Order> list = query.getResultList();
for(Order o : list){
System.out.println(o.getId() + "::" + o.getOrderId());
}
}
2,获取Order的分页数据,得到一个List集合
/**
* 虽然为原生的SQL查询,但是依然可以使用setFirstResult()和setMaxResults()方法。从而屏蔽了
* 底层数据库的差异性。
*/
@Test
public void pageList(){
String sql = "select * from orders";
//setFirstResult()从0开始
Query<Order> query = session.createNativeQuery(sql, Order.class).setFirstResult(1).setMaxResults(4);
List<Order> list = query.getResultList();
for(Order o : list){
System.out.println(o.getId());
}
}
3,多条件查询,返回List集合(第一种形式:索引占位符)
@Test
public void multiCretiera(){
String sql = "select * from orders where create_time between ? and ? and order_id like ?";
Query<Order> query = session.createNativeQuery(sql, Order.class);
String beginDateStr = "2016-07-26 00:00:00";
String endDateStr = "2016-07-28 23:59:59";
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd hh:mm:ss");
Date beginDate = null;
Date endDate = null;
try {
beginDate = sdf.parse(beginDateStr);
endDate = sdf.parse(endDateStr);
} catch (ParseException e) {
e.printStackTrace();
}
//分页从0开始
query.setParameter(0, beginDate).setParameter(1, endDate).setParameter(2, "%D%").setFirstResult(0).setMaxResults(1);
List<Order> list = query.getResultList();
for(Order o : list){
System.out.println(o.getOrderId() + "::" + o.getCreateTime());
}
}
4,多条件查询,返回List集合(第二种形式:命名占位符)
@Test
public void multiCretiera1(){
String sql = "select * from orders where order_id like :orderId and create_time between :beginDate and :endDate";
Query<Order> query = session.createNativeQuery(sql, Order.class);
String beginDateStr = "2016-07-26 00:00:00";
String endDateStr = "2016-07-28 23:59:59";
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd hh:mm:ss");
Date beginDate = null;
Date endDate = null;
try {
beginDate = sdf.parse(beginDateStr);
endDate = sdf.parse(endDateStr);
} catch (ParseException e) {
e.printStackTrace();
}
query.setParameter("orderId", "%D%").setParameter("beginDate", beginDate).setParameter("endDate", endDate);
List<Order> list = query.getResultList();
for(Order o : list){
System.out.println(o.getId() + "::" + o.getOrderId());
}}
5,大于条件的查询,使用索引占位符
@Test
public void gt(){
String sql = "select * from orders where id > ?";
Query<Order> query = session.createNativeQuery(sql, Order.class).setParameter(0, 3);
List<Order> list = query.getResultList();
for(Order o : list){
System.out.println(o.getId() + "::" + o.getOrderId());
}
}
6,删除操作
@Test
public void delete(){
String sql = "delete from orders where id in (:idList)";
Transaction tx = session.beginTransaction();
List<Integer> list = new ArrayList<Integer>();
list.add(1);
list.add(2);
Query<?> query = session.createNativeQuery(sql).setParameter("idList", list);
int i = query.executeUpdate();
System.out.println(i);
tx.commit();
session.close();
}
7,获取某一列的值
@Test
public void singleValue(){
String sql = "select order_id from orders";
Query<String> query = session.createNativeQuery(sql);
List<String> list = query.getResultList();
for(String str : list){
System.out.println(str);
}
}
8,获取关联对象的结果集
@Test
public void getCustomer(){
String sql = "select c.* from orders o join customer c on o.customer_id = c.id where c.id = 8";
Query<Customer> query = session.createNativeQuery(sql, Customer.class);
List<Customer> list = query.getResultList();
for(Customer o : list){
System.out.println(o.getId() + ";;");
}
}
9,多列数据的查询
@Test
public void getObjectArray(){
String sql = "select c.name, c.phone_number, o.order_id, o.create_time from orders o join customer c on o.customer_id = c.id";
Query<Object[]> query = session.createNativeQuery(sql);
List<Object[]> list = query.getResultList();
for(Object[] o : list){
System.out.println(o[0] + ";;" + o[1] + ";;" + o[2]);
}
}
10,函数查询
@Test
public void functionQuery(){
String sql = "select max(id), count(*) from orders";
Query<Object[]> query = session.createNativeQuery(sql);
Object[] obj = query.getSingleResult();
System.out.println(obj[0] + "::" + obj[1]);
}
11,排序
@Test
public void descQuery(){
String sql = "select * from orders order by id desc";
Query<Order> query = session.createNativeQuery(sql, Order.class);
List<Order> list = query.getResultList();
for(Order o : list){
System.out.println(o.getId() + "::" + o.getOrderId());
}
}
12,右连接
@Test
public void rightJoin(){
String sql = "select c.* from orders o right join customer c on o.customer_id = c.id";
Query<Customer> query = session.createNativeQuery(sql, Customer.class);
List<Customer> list = query.getResultList();
for(Customer c : list){
System.out.println(c.getId());
}
}