结构图.png

这个类名字那，我随便起的。别介意哈，User.java和User.hbm.xml好像名字得一样，反正一样就对了，里面有映射关系，好像是自己写的。

public class User{
    private String id;
    private String name;
    private String address;

    /**
     * @return the id
     */
    public String getId() {
        return id;
    }

    /**
     * @param id the id to set
     */
    public void setId(String id) {
        this.id = id;
    }

    /**
     * @return the name
     */
    public String getName() {
        return name;
    }

    /**
     * @param name the name to set
     */
    public void setName(String name) {
        this.name = name;
    }

    /**
     * @return the address
     */
    public String getAddress() {
        return address;
    }

    /**
     * @param address the address to set
     */
    public void setAddress(String address) {
        this.address = address;
    }

}

上面是一个User基础类

<?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>
    <class name="User">
        <id name="id" column="id"><!-- name:pojo类中属性名字  column:数据库中字段名 -->
            <generator class="native"></generator><!-- 主键的生成策略，这个是数据库中决定主键 -->
        </id>

        <property name="name"  column="name"></property>
        <property name="address" column="address"></property>
    </class>
</hibernate-mapping>

这个是User.hbm.xml文件
记得建一个文件log4j.properties这个东西 不然报错下面是代码

log4j.rootCategory=debug,stdout,A1
#log4j.rootCategory=INFO,stdout  
log4j.appender.stdout=org.apache.log4j.ConsoleAppender  
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout  
log4j.appender.stdout.layout.ConversionPattern=%p %c - %m%n  
  
log4j.appender.A1=org.apache.log4j.RollingFileAppender
log4j.appender.A1.File=${webApp.root}/WEB-INF/mylog.log
log4j.appender.A1.Encoding=UTF-8
log4j.appender.A1.MaxFileSize=4096KB
log4j.appender.A1.Append=true 
log4j.appender.A1.MaxBackupIndex=10
log4j.appender.A1.DatePattern='.'yyyy-MM-dd
log4j.appender.A1.layout=org.apache.log4j.PatternLayout
log4j.appender.A1.layout.ConversionPattern=%d %5p - %c -%-4r [%t]    - %m%n  
log4j.logger.org.mybatis=TRACE

下面是hibernate.cfg.xml 这个是配置数据库的

<!DOCTYPE hibernate-configuration PUBLIC
  "-//Hibernate/Hibernate Configuration DTD 3.0//EN"
  "http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
    <session-factory>
        <property name="hibernate.dialect">org.hibernate.dialect.MySQLDialect</property>
        <property name="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property>
        <property name="hibernate.connection.url">jdbc:mysql://localhost:3306/myhi</property><!--数据库的地址-->
        <property name="hibernate.connection.username">root</property>
        <property name="hibernate.connection.password">123456</property><!--数据库的密码-->

        <property name="hibernate.connection.provider_class">org.hibernate.connection.C3P0ConnectionProvider</property>
        <property name="c3p0.max_size">5</property>
        <property name="c3p0.timeout">120</property>
        <property name="c3p0.idle_test_period">3000</property>


        <property name="hibernate.show_sql">true</property>
        <property name="hibernate.format_sql">true</property>

        <property name="hibernate.hbm2ddl.auto">update</property>

        <property name="hibernate.connection.autocommit">true</property>

        <mapping resource="User.hbm.xml" />

    </session-factory>
</hibernate-configuration>

盗图.png

下面写一个测试类 名字随意

import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.Transaction;
import org.hibernate.cfg.Configuration;
import org.junit.Test;

/**
 * 
 */

/**
 * Description:
 * 
 * @author l.liang
 * @2018-7-27
 */
/**
 * Description:
 * 
 * @author l.liang
 * @2018-7-27
 */
public class Users{

    private static SessionFactory sessionFactory;

    static {
        Configuration configuration = new Configuration();
        configuration.configure("hibernate.cfg.xml"); // 读取指定的主配置文件
        sessionFactory = configuration.buildSessionFactory(); // 根据配置生成Session工厂
    }

    // Configuration configuration = new Configuration().configure();

    // SessionFactory sessionFactory = configuration.buildSessionFactory();
    // Session session = sessionFactory.openSession();
    // Transaction tx = session.beginTransaction();

    @Test
    public void updateUserTest() {
        User user = new User();
        user.setName("王二");
        user.setAddress("北京市海淀区宝盛西里");

        // 保存
        Session session = sessionFactory.openSession(); // 打开一个新的Session
        Transaction tx = session.beginTransaction(); // 开启事务

        session.save(user);

        tx.commit(); // 提交事务
        session.close(); // 关闭Session，释放资源(不一定是真正的关闭)
    }
}

后面说一下建数据库，我用的是Navicat for Mysql 建一个数据库就可以了。很简单 不过的设置一下主键id 自动增

用到的jar包.png