学习Spring第六天

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人不如故 10月 25, 2017
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hibernate框架使用

首先引入gradle依赖:

testCompile group: 'junit', name: 'junit', version: '4.12'
// https://mvnrepository.com/artifact/org.hibernate/hibernate-core
compile group: 'org.hibernate', name: 'hibernate-core', version: '5.2.12.Final'
// https://mvnrepository.com/artifact/mysql/mysql-connector-java
compile group: 'mysql', name: 'mysql-connector-java', version: '8.0.8-dmr'

然后创建一个实体类 Employee:

package com.demo.Model;

public class Employee {
    private int id;
    private String firstName;
    private String lastName;

    public int getId() {
        return id;
    }

    public void setId(int id) {
        this.id = id;
    }

    public String getFirstName() {
        return firstName;
    }

    public void setFirstName(String firstName) {
        this.firstName = firstName;
    }

    public String getLastName() {
        return lastName;
    }

    public void setLastName(String lastName) {
        this.lastName = lastName;
    }
}

然后创建持久化类 employee.hbm.xml

<?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>
    <class name="com.demo.Model.Employee" table="employee">
        <id name="id" column="ID">
            <generator class="assigned"/>
        </id>
        <property name="firstName" column="FIRST_NAME"/>
        <property name="lastName" column="LAST_NAME" />
    </class>
</hibernate-mapping>

创建hibernate配置文件 hibernate.cfg.xml

<?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>
        <property name="connection.driver_class">com.mysql.cj.jdbc.Driver</property>
        <property name="connection.url">jdbc:mysql://localhost:3306/hibernate</property>
        <property name="connection.username">root</property>
        <property name="connection.password">19970819wy</property>
        <property name="dialect">org.hibernate.dialect.MySQL5Dialect</property>
        <property name="show_sql">true</property>
        <property name="hibernate.hbm2ddl.auto">create</property>
        <mapping resource="hibernate/employee.hbm.xml"/>
    </session-factory>
</hibernate-configuration>

编写测试类 StoreData

package com.demo;


import com.demo.Model.Employee;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.Transaction;
import org.hibernate.cfg.Configuration;

public class StoreData {
    public static void main(String[] args) {
        Configuration cfg = new Configuration();
        cfg.configure("hibernate/hibernate.cfg.xml");

        SessionFactory factory = cfg.buildSessionFactory();

        Session session = factory.openSession();

        Transaction transaction = session.beginTransaction();

        Employee employee = new Employee();
        employee.setId(1);
        employee.setFirstName("Wang");
        employee.setLastName("Yu");

        session.persist(employee);

        transaction.commit();
        session.clear();

        System.out.println("successful saved");
    }
}

运行结果如下：

使用注解的形式来创建持久化实体类

我们首先用注解的形式来修改上面的Employee实体类

package com.demo.Model;

import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.Id;
import javax.persistence.Table;

@Entity
@Table(name = "tb_employee")
public class Employee {

    @Id
    @Column(name = "Em_ID")
    private int id;

    @Column(name = "Em_FirstName")
    private String firstName;

    @Column(name = "Em_LastName")
    private String lastName;

    public int getId() {
        return id;
    }

    public void setId(int id) {
        this.id = id;
    }

    public String getFirstName() {
        return firstName;
    }

    public void setFirstName(String firstName) {
        this.firstName = firstName;
    }

    public String getLastName() {
        return lastName;
    }

    public void setLastName(String lastName) {
        this.lastName = lastName;
    }
}

@Id表示主键
@Column表示对应数据表的列名称
@Entity是必须的，把Employee注册成实体类
@Table指定对应的数据表的名称

在hibernate.cfg.xml中修改一下mapping

<mapping class="com.demo.Model.Employee"/>

运行结果一致

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