hibernater基础
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Hibernate 的所有操作都基于Session进行的,增、删、改、查都是通过Session完成的。
Hibernate 最基础的内容包括以下内容:
1. 一个主配置文件,hibernate.cfg.xml ,最基本的内容如下:
- <?xml version='1.0' encoding='UTF-8'?>
- <!DOCTYPE hibernate-configuration PUBLIC
- "-//Hibernate/Hibernate Configuration DTD 3.0//EN"
- "http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">
- <!-- Generated by MyEclipse Hibernate Tools. -->
- <hibernate-configuration>
- <session-factory>
- <property name="myeclipse.connection.profile">Oracle Conn</property>
- <property name="connection.url">jdbc:mysql://localhost:3306/vvop?useUnicode=true&characterEncoding=UTF-8</property>
- <property name="connection.username">root</property>
- <property name="connection.password">123456</property>
- <property name="connection.driver_class">com.mysql.jdbc.Driver</property>
- <property name="dialect">org.hibernate.dialect.MySQLDialect</property>
- <property name="show_sql">true</property>
- <mapping resource="net/kentop/testhibernate/demo01/Titem.hbm.xml"></mapping>
- </session-factory>
- </hibernate-configuration>
2. 一个Pojo 类, 内容如下:
- package net.kentop.testhibernate.demo01;
- public class User {
- private String id;
- private String name;
- private String sex;
- private Integer age;
- public String getId() {
- return id;
- }
- public void setId(String id) {
- this.id = id;
- }
- public String getName() {
- return name;
- }
- public void setName(String name) {
- this.name = name;
- }
- public String getSex() {
- return sex;
- }
- public void setSex(String sex) {
- this.sex = sex;
- }
- public Integer getAge() {
- return age;
- }
- public void setAge(Integer age) {
- this.age = age;
- }
- }
3. 一个Pojo类的描述文件
- <?xml version="1.0" encoding='UTF-8'?>
- <!DOCTYPE hibernate-mapping PUBLIC
- "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
- "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd" >
- <!-- DO NOT EDIT: This is a generated file that is synchronized -->
- <!-- by MyEclipse Hibernate tool integration. -->
- <!-- Created Mon Dec 18 19:38:27 CST 2006 -->
- <hibernate-mapping package="net.kentop.testhibernate.demo01">
- <class name="User" table="user">
- <id name="id" column="id" type="string">
- <generator class="uuid.hex" />
- </id>
- <property name="name" column="name" type="string" not-null="true" />
- <property name="sex" column="sex" type="string" />
- <property name="age" column="age" type="int" />
- </class>
- </hibernate-mapping>
4. 一个进行增\删\改\查的操作类
- package net.kentop.testhibernate.demo01;
- import java.util.ArrayList;
- import java.util.Iterator;
- import java.util.List;
- import org.hibernate.Query;
- import org.hibernate.Session;
- import org.hibernate.SessionFactory;
- import org.hibernate.cfg.Configuration;
- public class UserOpera {
- private Session session;
- public UserOpera() {
- Configuration config = new Configuration().configure();
- SessionFactory factory = config.buildSessionFactory();
- this.session = factory.openSession();
- }
- public void insert(User user) {
- session.save(user);
- this.session.beginTransaction().commit();
- this.session.close();
- }
- public void insertUsers(ArrayList<User> users) {
- int i = 0;
- for(User user:users ) {
- session.save(user);
- i ++;
- if(i % 3 == 0) {
- session.beginTransaction().commit();
- }
- }
- session.beginTransaction().commit();
- }
- public User getUserById(String id) {
- User user = null;
- String hql = "from User where id=?";
- Query query = this.session.createQuery(hql);
- query.setString(0, id);
- List l = query.list();
- Iterator iter = l.iterator();
- while(iter.hasNext()) {
- user = (User)iter.next();
- }
- return user;
- }
- public void deleteById(String id) {
- String hql = "delete User where id=?";
- Query q = this.session.createQuery(hql);
- q.setString(0, id);
- q.executeUpdate();
- this.session.beginTransaction().commit();
- }
- public List getAllUser() {
- String hql = "from User";
- Query q = session.createQuery(hql);
- return q.list();
- }
- }
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