Java学习之Hibernate框架使用

<dependencies>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>8.0.19</version>
</dependency>
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-core</artifactId>
<version>5.4.10.Final</version>
</dependency>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<version>1.18.10</version>
</dependency>
</dependencies>

<?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">
<hibernate-configuration>
<session-factory>
<!-- 数据源配置 -->
<property name="connection.username">root</property>
<property name="connection.password">root</property>
<property
name="connection.driver_class">com.mysql.cj.jdbc.Driver</property>
<property name="connection.url">jdbc:mysql://localhost:3306/test?
useUnicode=true&amp;characterEncoding=UTF-8</property>
<!-- C3P0 -->
<property name="hibernate.c3p0.acquire_increment">10</property>
<property name="hibernate.c3p0.idle_test_period">10000</property>
<property name="hibernate.c3p0.timeout">5000</property>
<property name="hibernate.c3p0.max_size">30</property>
<property name="hibernate.c3p0.min_size">5</property>
<property name="hibernate.c3p0.max_statements">10</property>
<!-- 数据库⽅⾔ -->
<property name="dialect">org.hibernate.dialect.MySQLDialect</property>
<!-- 打印SQL -->
<property name="show_sql">true</property>
<!-- 格式化SQL -->
<property name="format_sql">true</property>
<!-- 是否⾃动⽣成数据库 -->
<property name="hibernate.hbm2ddl.auto"></property>
</session-factory>
</hibernate-configuration>

import lombok.Data;
import java.util.Set;
@Data
public class Customer {
private Integer id;
private String name;
private Set<Orders> orders;
}

import lombok.Data;
@Data
public class Orders {
private Integer id;
private String name;
private Customer customer;
}

import lombok.Data;
@Data
public class People {
private Integer id;
private String name;
private Double money;
}

<?xml version="1.0"?>5、实体关系映射⽂件注册到 Hibernate 的配置⽂件中。
6、使⽤ Hibernate API 完成数据操作。
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD
3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<hibernate-mapping>
<class name="com.southwind.entity.People" table="people">
<id name="id" type="java.lang.Integer">
<column name="id"></column>
<generator class="identity"></generator>
</id>
<property name="name" type="java.lang.String">
<column name="name"></column>
</property>
<property name="money" type="java.lang.Double">
<column name="money"></column>
</property>
</class>
</hibernate-mapping>

<mapping resource="com/nice0e3/entity/People.hbm.xml"></mapping>

import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.Configuration;
public class Test {
public static void main(String[] args) {
//创建Configuration
Configuration configuration = new
Configuration().configure("hibernate.xml");
//获取SessionFactory
SessionFactory sessionFactory = configuration.buildSessionFactory();
//获取Session
Session session = sessionFactory.openSession();
People people = new People();
    people.setName("张三");
people.setMoney(1000.0);
session.save(people);
session.beginTransaction().commit();
session.close();
}
}

<build><resources><resource><directory>src/main/java</directory><includes><include>**/*.xml</include></includes></resource></resources></build>