（初學Hibernate）Hibernate對資料庫的增刪改查)Hibernate所需jar包可以在Hibernate官網下載




最後倒計時結束後下載框才會提示出來

現在開始放程式碼了

Hibernate配置檔案hibernate.cfg.xml

<?xml version="1.0" encoding="UTF-8"?>
<!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>
		<!-- 設定字元編碼集 -->
		<property name="connection.useUnicode">true</property>
		<property name="connection.characterEncoding">UTF-8</property>
		<!-- 方言 -->
		<property name="dialect">org.hibernate.dialect.MySQLDialect</property>
		<!-- 設定地址 -->
		<property name="connection.url">jdbc:mysql://localhost:3306/task</property>
		<!-- 使用者名稱 -->
		<property name="connection.username">root</property>
		<!-- 密碼 -->
		<property name="connection.password">root</property>
		<!-- 驅動 -->
		<property name="connection.driver_class">com.mysql.jdbc.Driver</property>
		<!-- 顯示sql語句 -->
		<property name="show_sql">true</property>
		<property name="hbm2ddl.auto">update</property>
		<!-- 關聯對映檔案 -->
		<mapping resource="com/entity/News.hbm.xml" />

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

 

這裡需要注意關聯對映檔案以及設定的地址中對應的資料庫名稱

建立實體類News.java

package com.entity;
public class News {
	private int id;
	private String title;
	private String content;
	public int getId() {
		return id;
	}
	public void setId(int id) {
		this.id = id;
	}
	public String getTitle() {
		return title;
	}
	public void setTitle(String title) {
		this.title = title;
	}
	public String getContent() {
		return content;
	}
	public void setContent(String content) {
		this.content = content;
	}
	
}

 

配置對映檔案News.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>
	<class name="com.entity.News" table="news">
		<id name="id" column="id" type="integer">
			<generator class="native"></generator>
		</id>
		<property name="title" column="title" type="string" />
		<property name="content" column="content" type="string" />
	</class>
</hibernate-mapping>

 

類測試NewsDao

package com.dao;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.Transaction;
import org.hibernate.boot.registry.StandardServiceRegistry;
import org.hibernate.boot.registry.StandardServiceRegistryBuilder;
import org.hibernate.cfg.Configuration;

import com.entity.News;

public class NewsDao {
	static Configuration cfg = null; // 讀取配置檔案的物件
	static SessionFactory sf = null; // 建立會話工廠的物件
	static Session session = null;// 開啟session
	static Transaction t = null; // 開啟事務

	static {
		cfg = new Configuration().configure();
		StandardServiceRegistry ssr = new StandardServiceRegistryBuilder().applySettings(cfg.getProperties()).build();
		sf = cfg.buildSessionFactory(ssr);
		session = sf.openSession();
		t = session.beginTransaction();
	}

	// 新增資料
	public static void insert(News n) {

			try {
				session.save(n);
				System.out.println("insert datas:success！");
			} catch (Exception e) {
				// TODO: handle exception
				System.out.println("insert datas:error！");
			} 
			end();
	}

	// 修改資料
	public static void update(News n){

		try {
			session.update(n);
			System.out.println("update datas:success！");
		} catch (Exception e) {
			// TODO: handle exception
			System.out.println("update datas:error！");
		} 
		end();
		
	}
	
	//根據id刪除資料
	public static void delete(News n){

		try {
			session.delete(n);
			System.out.println("delete datas:success！");
		} catch (Exception e) {
			// TODO: handle exception
			System.out.println("delete datas:error！");
		} 
		end();
	}
	
	
	//根據id查詢資料
	public static News select(int id){
		News n;
		try {
			n = (News) session.get(News.class, id);
			return n;
		} catch (Exception e) {
			
			System.out.println("delete datas:error！");
			return n = null;
		} finally {
			end();
		}
		
		
	}
	
	// 關閉資源
	public static void end(){
		t.commit();
		sf.close();
	}

}

新人第一次釋出，不好的地方希望諒解