Hibernate实现简单的增删查改（Hibernate3.6版本）

一，新建一个Java项目
1.导入相关的jar包

2.编写核心配置文件
可以参考Hibernate3.6文件中的project/ect 配置文件的模板

hibernate的核心配置文件 默认叫做hibernate.cfg.xml
我们都希望看一下 hibernate的执行过程 所以我们需要引入 hibernate的日志
需要引入 slf4j-log4j.jar这个jar包下载地址:http://mvnrepository.com/artifact/org.slf4j/slf4j-log4j12/1.6.1
log4j.jar 这个jar包下载地址:http://mvnrepository.com/artifact/log4j/log4j/1.2.11
还需要找到Hibernate3.6文件中project/etc/log4j.properties 日志文件 引入到我们项目中
这样就可以看到日志
hibernate.cfg.xml核心配置文件如下：

<hibernate-configuration>
    <session-factory>
        <property name="hibernate.dialect">org.hibernate.dialect.MySQLDialectproperty>
        <property name="hibernate.connection.driver_class">com.mysql.jdbc.Driverproperty>
        <property name="hibernate.connection.url">jdbc:mysql://localhost:3306/xmzproperty>
        <property name="hibernate.connection.username">rootproperty>
        <property name="hibernate.connection.password">rootproperty>
        <property name="hibernate.jdbc.batch_size">20property>
        <property name="hibernate.show_sql">trueproperty> 
        <property name="hibernate.format_sql">trueproperty> 

        <mapping resource="com/oracle/bean/salary.hbm.xml">mapping>
        
        

    session-factory>
hibernate-configuration>

3.编写一个实体类 目的是和数据表做关系映射

package com.oracle.bean;

public class Salary {
  private Long workcode;
  private String uname;
  private String dept;
  private Double base_salary;
  private Double extract;
  private Double leave;
  private Double sick;
  private Double pk;

  public Long getWorkcode() {
    return workcode;
  }

  public void setWorkcode(Long workcode) {
    this.workcode = workcode;
  }

  public String getUname() {
    return uname;
  }

  public void setUname(String uname) {
    this.uname = uname;
  }

  public String getDept() {
    return dept;
  }

  public void setDept(String dept) {
    this.dept = dept;
  }

  public Double getBase_salary() {
    return base_salary;
  }

  public void setBase_salary(Double base_salary) {
    this.base_salary = base_salary;
  }

  public Double getExtract() {
    return extract;
  }

  public void setExtract(Double extract) {
    this.extract = extract;
  }

  public Double getLeave() {
    return leave;
  }

  public void setLeave(Double leave) {
    this.leave = leave;
  }

  public Double getSick() {
    return sick;
  }

  public void setSick(Double sick) {
    this.sick = sick;
  }

  public Double getPk() {
    return pk;
  }

  public void setPk(Double pk) {
    this.pk = pk;
  }

  @Override
  public String toString() {
    return "Salary{" +
            "workcode=" + workcode +
            ", uname='" + uname + '\'' +
            ", dept='" + dept + '\'' +
            ", base_salary=" + base_salary +
            ", extract=" + extract +
            ", leave=" + leave +
            ", sick=" + sick +
            ", pk=" + pk +
            '}';
  }
}

4.建立我们映射的配置文件 名字一般叫做 类名.hbm.xml
如果当前你的类的属性和表的字段 名称是一致 可以省略掉后台的column

<hibernate-mapping package="com.oracle.bean">
    <class name="Salary" table="salary">
        <id name="workcode" column="workcode">id>
        <property name="uname" column="uname">property>
        <property name="dept" column="dept">property>
        <property name="base_salary" column="base_salary">property>
        <property name="extract" column="extract">property>
        <property name="leave" column="leav">property>
        <property name="sick" column="sick">property>
        <property name="pk" column="pk">property>
    class>
hibernate-mapping>

5.将映射文件写完之后 需要将映射文件加入到hibernate.cfg.xml配置文件中

6.完成代码
新增功能

package com.oracle.core;

import com.oracle.bean.Salary;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.Configuration;
import org.hibernate.classic.Session;

public class SalaryCreate {

    public static void main(String[] args) {
        //加载核心配置文件 hibernate.cfg.xml
        Configuration cfg = new Configuration();
        //开始解析
        cfg.configure(); //获取连接 默认配置文件
        //获取连接工厂
        SessionFactory sessionFactory = cfg.buildSessionFactory();
        //从工厂中获取一个连接
        Session session = sessionFactory.openSession();
        //开启事务
        session.beginTransaction();
        //执行持久化操作 CRUD
        Salary salary = new Salary();
        salary.setWorkcode(5l); //Long类型
        salary.setUname("哈哈");
        salary.setDept("调研部");
        salary.setBase_salary(3000d);
        salary.setExtract(20000d);
        salary.setLeave(300d);
        salary.setSick(200d);
        salary.setPk(0d);
        //增加
        session.save(salary); //操作对象即操作表
        //提交事务
        session.getTransaction().commit();
        //关闭session
        session.close();
        //关闭session工厂
        sessionFactory.close();
    }
}

修改功能

package com.oracle.core;

import com.oracle.bean.Salary;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.Configuration;
import org.hibernate.classic.Session;

public class SalaryUpdate {

    public static void main(String[] args) {

        Configuration cfg = new Configuration();
        cfg.configure();
        SessionFactory sessionFactory = cfg.buildSessionFactory();
        Session session = sessionFactory.openSession();
        session.beginTransaction();
        //持久化操作
        Salary salary = (Salary) session.get(Salary.class,5l);
        salary.setDept("研发部");
        salary.setExtract(10000d);
        salary.setUname("张昊");

        session.update(salary);
        //提交事务
        session.getTransaction().commit();
        session.close();
        sessionFactory.close();
    }
}

查询功能

package com.oracle.core;

import com.oracle.bean.Salary;
import org.hibernate.Query;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.Configuration;
import org.hibernate.classic.Session;

import java.util.List;

public class SalaryQuery {

    public static void main(String[] args) {

        Configuration cfg = new Configuration();
        cfg.configure();
        SessionFactory sessionFactory = cfg.buildSessionFactory();
        Session session = sessionFactory.openSession();
        session.beginTransaction();

        //持久化操作
        Query query = session.createQuery("select s from Salary s");
        List list1 = query.list(); //获取查询出来的数据
        for(Salary s: list1){
            System.out.println();
        }

        //单列得到的是 object数据
        query = session.createQuery("select s.leave from Salary s");
        //query 查询分析器
        List