Hibernate框架：增删改查
Hibernate框架：增删改查
步骤：
1.环境准备：
2.创建项目：
首先，打开eclipse新建一个javaweb项目，然后将 hibernate-release-5.2.10.Final解压文件夹的hibernate-release-5.2.10.Final\lib\required下面的所有jar包，全部拷贝到你创建的javaweb工程下的lib目录下，再将mysql-connector-java-5.1.37-bin.jar也一同拷贝到javaweb的lib下。如图：
3.创建数据库：
打开navicat，创建student表,注意设置id为主键且id自增：
CREATE TABLE `student` (
`id` int(10) NOT NULL AUTO_INCREMENT,
`name` varchar(30) NOT NULL,
`age` int(3) NOT NULL,
PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=4 DEFAULT CHARSET=utf8;
如图：
4.配置文件操作：
在项目的src目录下创建一个hibernate.cfg.xml文件，数据库连接的一些内容需要你自己修改，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">
<hibernate-configuration>
<session-factory>
<!-- Database connection settings 数据库连接设置-->
<!-- 驱动类 -->
<property name="connection.driver_class">com.mysql.jdbc.Driver</property>
<!-- url地址 -->
<property name="connection.url">jdbc:mysql://localhost/hibernate</property>
<property name="connection.username">root</property>
<property name="connection.password">root</property>
<property name="connection.pool_size">1</property>
<!-- SQL dialect (SQL 方言) -->
<property name="dialect">org.hibernate.dialect.MySQLDialect</property>
<property name="current_session_context_class">thread</property>
<property name="cache.provider_class">org.hibernate.cache.NoCacheProvider</property>
<!--在控制台打印后台的SQL语句 -->
<property name="show_sql">true</property>
<!--在控制台打印后台的SQL语句 -->
<property name="show_sql">true</property>
<!-- 自动生成student表 -->
<property name="hbm2ddl.auto">update</property>
<!-- 关联小配置 -->
<mapping resource="com/hibernate/model/Student.hbm.xml"/>
</session-factory>
</hibernate-configuration>
创建一个Student类：
package com.hibernate.model;
public class Student {
private int id;
private String name;
private int age;
public int getId() {
return id;
}
public String getName() {
return name;
}
public int getAge() {
return age;
}
public void setId(int id) {
this.id = id;
}
public void setName(String name) {
this.name = name;
}
public void setAge(int age) {
this.age = age;
}
@Override
public String toString() {
return "Student [id=" + id + ", age=" + age + ", name=" + name + "]";
}
}
最后再创建一个student表的映射文件Student.hbm.xml，放在与student同一个包下：
<?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">
<hibernate-mapping package="com.hibernate.model"><!-- 这里的package记得要写对啊。要不然运行也会出错的 -->
<class name="Student" table="student"><!-- 如果表名跟类名一个样的话，那么table属性可以不写 -->
<id name="id"></id>
<property name="name"></property>
<property name="age"></property>
</class>
</hibernate-mapping>
5.代码实现：增删改查：
增加：
package com.hibernate.test;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.Configuration;
import com.hibernate.model.Student;
public class StudentTestAdd {
public static void main(String[] args) {
Student s = new Student();
s.setId(3);
s.setAge(21);
s.setName("李四");
Configuration cfg = new Configuration();
SessionFactory sf = cfg.configure().buildSessionFactory();
Session session = sf.openSession();
session.beginTransaction();
session.save(s);
session.getTransaction().commit();
session.close();
sf.close();
}
}
删除：
package com.hibernate.test;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.Configuration;
import com.hibernate.model.Student;
public class StudentTestDelete {
public static void main(String[] args) {
Configuration cfg = new Configuration();
SessionFactory sf = cfg.configure().buildSessionFactory();
Session session = sf.openSession();
session.beginTransaction();
// 删除主键为1的学生
Student student = (Student) session.get(Student.class, Integer.valueOf(1));
session.delete(student);
session.getTransaction().commit();
session.close();
sf.close();
System.out.println("删除成功");
}
}
修改：
package com.hibernate.test;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.Configuration;
import com.hibernate.model.Student;
public class StudentTestModify {
public static void main(String[] args) {
Configuration cfg = new Configuration();
SessionFactory sf = cfg.configure().buildSessionFactory();
Session session = sf.openSession();
session.beginTransaction();
// 修改主键为2的学生
Student student = (Student) session.get(Student.class, Integer.valueOf(2));
student.setName("张三2");
session.save(student);
session.getTransaction().commit();
session.close();
sf.close();
System.out.println("修改成功");
}
}
查询：
package com.hibernate.test;
import java.util.List;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.Configuration;
import org.hibernate.query.Query;
import com.hibernate.model.Student;
public class StudentTestQuery {
public static void main(String[] args) {
Configuration cfg = new Configuration();
SessionFactory sf = cfg.configure().buildSessionFactory();
Session session = sf.openSession();
session.beginTransaction();
// 查找student表里的所有的学生
String hql = "from Student";
Query<Student> query = session.createQuery(hql);
List<Student> studentList = query.list();
for (Student student : studentList) {
System.out.println(student);
}
session.getTransaction().commit();
session.close();
sf.close();
System.out.println("查找成功");
}
}
6.运行效果
最终项目的文件目录如下：
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