Intellij Idea Hibernate 环境搭建

Posted 2021-01-25 twfb

1. 新建hibernate项目

   • 

2. 添加mysql-connector

   • ctrl+alt+shift+s lib add mysql-connector
     
     

3. 创建实体类

   • src/entity/User.java

       package entity;
   
       public class User {
           //hibernate 要求实体类有一个属性唯一
           private int uid;
           private String username;
           private String password;
           private String address;
       
           public int getUid() {
               return uid;
           }
       
           public void setUid(int uid) {
               this.uid = uid;
           }
       
           public String getUsername() {
               return username;
           }
       
           public void setUsername(String username) {
               this.username = username;
           }
       
           public String getPassword() {
               return password;
           }
       
           public void setPassword(String password) {
               this.password = password;
           }
       
           public String getAddress() {
               return address;
           }
       
           public void setAddress(String address) {
               this.address = address;
           }
       }
   

4. 创建src/rntity/User.hbm.xml

    <?xml version=\'1.0\' encoding=\'utf-8\'?>
    <!DOCTYPE hibernate-mapping PUBLIC
            "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
            "http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd">
    <hibernate-mapping>
        <!--
    
            - 配置类和表对应
            - class
                - name: 实体类的全路径
                - table: 数据库表名称
            - id
                - name: 实体类的id属性名称
                - column: 生成表的字段名称
            - generator
                - class
                    - native: 生成表主键id自增长
            - property
                - name: 属性名
                - column: 字段名
        -->
        <class name="entity.User" table="t_user">
            <id name="uid">
                <generator class="native"/>
            </id>
            <property name="username"/>
            <property name="password"/>
            <property name="address"/>
        </class>
    </hibernate-mapping>

4. 配置hibernate.cfg.xml

    <?xml version=\'1.0\' encoding=\'utf-8\'?>
    <!DOCTYPE hibernate-configuration PUBLIC
            "-//Hibernate/Hibernate Configuration DTD//EN"
            "http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd">
    <hibernate-configuration>
        <session-factory>
            <!--第一部分: 配置数据库信息-->
            <!--ctrl+alt+shift+s lib add mysql-connector-->
            <property name="connection.url">
                jdbc:mysql://127.0.0.1:3306/hibernate_test?useUnicode=true&amp;characterEncoding=utf-    8&amp;useJDBCCompliantTimezoneShift=true&amp;useLegacyDatetimeCode=false&amp;serverTimezone=UTC
            </property>
            <property name="connection.driver_class">com.mysql.jdbc.Driver</property>
            <property name="connection.username">root</property>
            <property name="connection.password">passwd</property>
            <!--第二部分: 可选-->
            <!-- DB schema will be updated if needed -->
            <property name="hbm2ddl.auto">update</property>
            <!--输出sql语句, 并格式化-->
            <property name="show_sql">true</property>
            <property name="format_sql">true</property>
            <!--各个数据库的方言-->
            <property name="dialect">org.hibernate.dialect.MySQL5Dialect</property>
            <!--第三部分: 映射文件-->
            <mapping resource="entity/User.hbm.xml"/>
        </session-factory>
    </hibernate-configuration>

5. 修改Main.java

    import entity.User;
    import org.hibernate.*;
    import org.hibernate.cfg.Configuration;
    
    
    public class Main {
        private static final SessionFactory ourSessionFactory;
    
        static {
            try {
                //加载核心配置文件
                Configuration configuration = new Configuration();
                configuration.configure();
    
                //创建SessionFactory对象, 并在数据库中把表创建出来
    
                ourSessionFactory = configuration.buildSessionFactory();
            } catch (Throwable ex) {
                throw new ExceptionInInitializerError(ex);
            }
        }
    
        public static Session getSession() throws HibernateException {
            //创建Session
            return ourSessionFactory.openSession();
        }
    
        public static void main(final String[] args) throws Exception {
            final Session session = getSession();
    
            try {
                User user = new User();
                user.setUsername("小李");
                user.setPassword("123");
                user.setAddress("日本");
                session.save(user);
                session.beginTransaction().commit();
            } finally {
                session.close();
            }
        }
    }

6. 执行Main.java
7. 注意事项

    <property name="connection.url">
                jdbc:mysql://127.0.0.1:3306/hibernate_test?useUnicode=true&amp;characterEncoding=utf-8&amp;useJDBCCompliantTimezoneShift=true&amp;useLegacyDatetimeCode=false&amp;serverTimezone=UTC
    </property>
    <property name="dialect">org.hibernate.dialect.MySQL5Dialect</property>
    <mapping resource="entity/User.hbm.xml"/> 要放到最后