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简单使用hibernate(idea中使用)讲解

developer 2021年02月13日 编程语言 192 0

首先创建一个maven项目

创建成功后,进行创建数据库的表

CREATE TABLE BOOK( 
ID INT AUTO_INCREMENT PRIMARY KEY, 
NAME VARCHAR(20), 
NUMBER int ); 
insert into BOOK(NAME,NUMBER) VALUES 
('Java程序设计',10), 
('数据结构',10), 
('设计模式',10)

然后再刚刚创建的项目里创建一个类,该类名称、字段要与数据库的一样

必须注意使用的注释

package com.wbg.entity; 
 
import javax.persistence.Entity; 
import javax.persistence.GeneratedValue; 
import javax.persistence.GenerationType; 
import javax.persistence.Id; 
 
@Entity 
public class Book { 
    @Id 
    @GeneratedValue(strategy= GenerationType.IDENTITY) 
    Long id; 
    String name; 
    int number; 
 
    public Book() { 
    } 
 
    public Book(Long id, String name, int number) { 
        this.id = id; 
        this.name = name; 
        this.number = number; 
    } 
 
    public Long getBook_id() { 
        return id; 
    } 
 
    public void setBook_id(Long id) { 
        this.id = id; 
    } 
 
    public String getName() { 
        return name; 
    } 
 
    public void setName(String name) { 
        this.name = name; 
    } 
 
    public int getNumber() { 
        return number; 
    } 
 
    public void setNumber(int number) { 
        this.number = number; 
    } 
@Override 
public String toString() { 
    return "Book{" + 
            "id=" + id + 
            ", name='" + name + '\'' + 
            ", number=" + number + 
            '}'; 
} 
}

 

进行在pom.xml文件中添加依赖

<dependencies> 
        <dependency> 
            <groupId>org.hibernate</groupId> 
            <artifactId>hibernate-core</artifactId> 
            <version>5.3.6.Final</version> 
        </dependency> 
        <!-- https://mvnrepository.com/artifact/org.mariadb.jdbc/mariadb-java-client --> 
        <dependency> 
            <groupId>org.mariadb.jdbc</groupId> 
            <artifactId>mariadb-java-client</artifactId> 
            <version>2.3.0</version> 
        </dependency> 
        <dependency> 
            <groupId>junit</groupId> 
            <artifactId>junit</artifactId> 
            <version>4.11</version> 
            <scope>test</scope> 
        </dependency> 
    </dependencies>

在resources资源文件夹目录下面创建一个hibernate.xml配置文件

<?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> 
        <!--数据库驱动--> 
        <property name="hibernate.connection.driver_class">org.mariadb.jdbc.Driver</property> 
        <!--连接--> 
        <property name="hibernate.connection.url">jdbc:mariadb://localhost:3306/stu</property> 
        <!--用户名--> 
        <property name="hibernate.connection.username">root</property> 
        <!--密码--> 
        <property name="hibernate.connection.password">123456</property> 
 
        <property name="hibernate.dialect">org.hibernate.dialect.MariaDB10Dialect</property> 
 
        <property name="hibernate.show_sql">true</property> 
 
        <mapping class="com.wbg.entity.Book"/> 
    </session-factory> 
</hibernate-configuration>

测试成功

package com.wbg; 
 
 
import com.wbg.entity.Book; 
import org.hibernate.Session; 
import org.hibernate.SessionFactory; 
import org.hibernate.cfg.Configuration; 
 
public class test { 
 
    public static void main(String[] args) { 
 
        Configuration configuration=new Configuration(); 
        Configuration configure=configuration.configure("hibernate.xml"); 
        SessionFactory sessionFactory=configuration.buildSessionFactory(); 
        Session session=sessionFactory.openSession(); 
       Book book= session.get(Book.class,2L); 
        System.out.println(book.toString()); 
 
    } 
}

 

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