Hibernate-操作数据库-类对象插入-1

Posted 2021-05-17 PushyTao

-1为非带注解版本

框架

• -1为非带注解版本
• • 工程框架：
  • • Student类：
    • hibernate.cfg.xml
    • log4j.properties:
    • Student.hbm.xml
    • StudentTest类：
    • 数据库结构以及表的设计

基于hibernate的小项目（小的不能再小了，还有很多功能没有加上）带完善版本

工程框架：

Student类：

package cn.edu.ldu.entity;

public class Student {
    private int id;
    private String name;
    //必须要有一个无参的构造方法
    //如果写了一个有参构造，必须要有一个午餐的构造方法写出来
    public int getId() {
        return id;
    }

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

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }
}

hibernate.cfg.xml

<?xml version='1.0' encoding='utf-8'?>
<!DOCTYPE hibernate-configuration PUBLIC
    "-//Hibernate/Hibernate Configuration DTD//EN"
    "http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
  <session-factory>
    <property name="url">
      jdbc:mysql://localhost:3306/hibernate?characterEncoding=utf-8&amp;useSSL=false&amp;serverTimezone=UTC
    </property>
<!--    ?characterEncoding=utf-8&useSSL=false&serverTimezone=UTC-->
    <property name="driverClassName"> com.mysql.cj.jdbc.Driver </property>
    <property name="username">root</property><!--connection.-->
    <property name="password">123456</property>
    <!-- DB schema will be updated if needed -->
    <property name="connection.provider_class">
      com.alibaba.druid.support.hibernate.DruidConnectionProvider </property>
    <property name="filters">stat</property>
    <property name="hibernate.current_session_context_class">thread</property>
    <property name="show_sql">true</property>
    <property name="format_sql">true</property>
    <property name="hbm2ddl.auto">create</property>
    <property name="hibernate.hibernate.hbm2ddl.auto">update</property>
    <!--    进行修改-->
    <property name="hibernate.dialect">org.hibernate.dialect.MySQL8Dialect</property>
<!--    加入映射-->
    <mapping resource="Student.hbm.xml"></mapping>
  </session-factory>
</hibernate-configuration>

log4j.properties:

#
# Hibernate, Relational Persistence for Idiomatic Java
#
# License: GNU Lesser General Public License (LGPL), version 2.1 or later.
# See the lgpl.txt file in the root directory or <http://www.gnu.org/licenses/lgpl-2.1.html>.
#

### direct log messages to stdout ###
log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.Target=System.out
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern=%d{ABSOLUTE} %5p %c{1}:%L - %m%n

### direct messages to file hibernate.log ###
#log4j.appender.file=org.apache.log4j.FileAppender
#log4j.appender.file.File=hibernate.log
#log4j.appender.file.layout=org.apache.log4j.PatternLayout
#log4j.appender.file.layout.ConversionPattern=%d{ABSOLUTE} %5p %c{1}:%L - %m%n

### set log levels - for more verbose logging change 'info' to 'debug' ###

log4j.rootLogger=warn, stdout

#log4j.logger.org.hibernate=info
log4j.logger.org.hibernate=debug

### log HQL query parser activity
#log4j.logger.org.hibernate.hql.ast.AST=debug

### log just the SQL
## 2021-05-10取消注释
log4j.logger.org.hibernate.SQL=debug 

### log JDBC bind parameters ###
## log4j.logger.org.hibernate.type=info
log4j.logger.org.hibernate.type=debug

### log schema export/update ###
log4j.logger.org.hibernate.tool.hbm2ddl=debug

### log HQL parse trees
#log4j.logger.org.hibernate.hql=debug

### log cache activity ###
#log4j.logger.org.hibernate.cache=debug

### log transaction activity
#log4j.logger.org.hibernate.transaction=debug

### log JDBC resource acquisition
#log4j.logger.org.hibernate.jdbc=debug

### enable the following line if you want to track down connection ###
### leakages when using DriverManagerConnectionProvider ###
#log4j.logger.org.hibernate.connection.DriverManagerConnectionProvider=trace

Student.hbm.xml

<?xml version="1.0"?>
<!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="cn.edu.ldu.entity.Student" table="student" catalog="hibernate">
        <id name="id"> <generator class="native"/> </id><!--代表主键-->
        <property name="name" type="string" length="255"/>
<!--        <property name="" type="" length=""></property>-->
    </class>
</hibernate-mapping>

StudentTest类：

package cn.edu.ldu.entity;

import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.Transaction;
import org.hibernate.cfg.Configuration;
import org.junit.After;
import org.junit.Before;
import org.junit.jupiter.api.Test;

public class StudentTest {
    public static void main(String[] args) {
        Configuration config = new Configuration().configure("/hibernate.cfg.xml");
        SessionFactory sessionFactory = config.buildSessionFactory();
        Session session = sessionFactory.openSession();
        Student student = new Student();
        student.setName("PushyTao");
        session.beginTransaction(); //完整性一致性
        session.save(student);
        session.getTransaction().commit(); //提交
        session.close();
        sessionFactory.close();
    }
    /*JUnit调试
    @Before
    public void testJunit(){
        System.out.println("before");
    }
    @Test
    public void testInsert(){
        System.out.println("test the insert");
    }
    @After
    public void testUpdate(){
        System.out.println("after");
    }*/

}

数据库结构以及表的设计

主键为ID并且自动递增