hibernate环境搭建

1、导包:

 

 (1)required文件夹下的jar包都需要导入:

 

 (2)mysql驱动包:

 

 (3)jpa目录下的jar包:

(4)日志jar包:

因为hibernate在使用的时候会有日志信息的输出,而hibernate本身没有日志输出的功能,因此要导入jar包。

2、创建实体类

package pers.zhb.domain;public class Student { private String studentno; private String sname; private String sex; private String birthday; private String classno; private float point; private String phone; private String email; @Override public String toString() { return "Student{" + "studentno=‘" + studentno + ‘\‘‘ + ", sname=‘" + sname + ‘\‘‘ + ", sex=‘" + sex + ‘\‘‘ + ", birthday=‘" + birthday + ‘\‘‘ + ", classno=‘" + classno + ‘\‘‘ + ", point=" + point + ", phone=‘" + phone + ‘\‘‘ + ", email=‘" + email + ‘\‘‘ + ‘}‘; } public String getStudentno() { return studentno; } public void setStudentno(String studentno) { this.studentno = studentno; } public String getSname() { return sname; } public void setSname(String sname) { this.sname = sname; } public String getSex() { return sex; } public void setSex(String sex) { this.sex = sex; } public String getBirthday() { return birthday; } public void setBirthday(String birthday) { this.birthday = birthday; } public String getClassno() { return classno; } public void setClassno(String classno) { this.classno = classno; } public float getPoint() { return point; } public void setPoint(float point) { this.point = point; } public String getPhone() { return phone; } public void setPhone(String phone) { this.phone = phone; } public String getEmail() { return email; } public void setEmail(String email) { this.email = email; }}

在创建类的时候一定要注意:要创建一个类似于表的主键的属性,用于唯一标识一个实体。

3、通过配置文件实现实体类和数据库表的对应关系(表对应,实体属性与表的字段)

(1)引入dtd约束(https://www.cnblogs.com/zhai1997/p/11439664.html):

 在上面的文件中复制如下约束:

<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN" "http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd">

创建xml文件,在实体类对应的包里面创建,文件名:hbm.xml(不是固定的)。

(2)创建实体类与表的对应关系:

<?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="pers.zhb.domain.Student" table="student"> <id name="studentno" column="studentno"> <generator class="native"></generator> </id> <property name="birthday" column="birthday"></property> <property name="classno" column="classno"></property> <property name="email" column="email"></property> <property name="phone" column="phone"></property> <property name="sex" column="sex"></property> <property name="sname" column="sname"></property> <property name="point" column="point"></property> </class></hibernate-mapping>

(1)配置类和表对应:

 <class name="pers.zhb.domain.Student" table="student">

其中类为全路径,表为表的名字。

(2)实体类中的保持唯一的属性和表的主键保持对应:

<id name="studentno" column="studentno"> <generator class="native"></generator> </id>

设置主键为自动增长,name为实体类属性的名字,column为表的字段名称。

(3)设置其他属性实体类属性与表的字段的对应关系:

 <property name="birthday" column="birthday"></property> <property name="classno" column="classno"></property> <property name="email" column="email"></property> <property name="phone" column="phone"></property> <property name="sex" column="sex"></property> <property name="sname" column="sname"></property> <property name="point" column="point"></property>

 4、核心配置文件:

(1)位置(src目录下)和名称(hibernate.cfg.xml)固定。

(2)引入约束:

<!DOCTYPE hibernate-configuration PUBLIC "-//Hibernate/Hibernate Configuration DTD 3.0//EN" "http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd">

(3)hibernate在执行过程中,只会加载核心配置文件,其它文件不会被加载。

 

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