hibernate批量处理数据

Posted 2020-08-30

(1)使用HQL进行批量操作  数据库层面  executeUpdate()

 

@Test
public void test2() {
    Query query = session.createQuery("insert into Stu(sname) select s.sname from Stu s");
    query.executeUpdate();
}

@Test
public void test3() {
    Query query = session.createQuery("update Stu set sname=‘学生1‘ where sid>2");
    query.executeUpdate();
}

 

(2)使用JDBC API进行批量操作  数据库层面

 

@Test
public void test4() {
    Work work = new Work() {
        public void execute(Connection connection) throws SQLException {
            Statement statement = connection.createStatement();
            ResultSet resultSet = statement.executeQuery("SELECT  * FROM Stu1");
            while (resultSet.next()) {
                System.out.println(resultSet.getString("sname"));
            }
        }
    };
    session.doWork(work);
}

 

(3)使用Session进行批量操作   会进缓存

 

@Test
public void test5() {
    for (int i = 0; i < 100; i++) {
        Stu stu = new Stu();
        stu.setSname("学员2222");
        session.save(stu);
        if (i % 30 == 0) {
            session.flush();
            session.clear();
        }
    }
}