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Springboot整合JPA+Hibernate框架【待完成】

• 随着MybatisPlus技术的发展，JPA和Hibernate技术已经逐步淘汰
  JPA遵循了Hibernate框架规则，目前使用的不多

1、添加依赖

<!--jpa-->
<dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>

2、添加配置

# JPA配置
spring.jpa.database = MYSQL
spring.jpa.show-sql = true
spring.jpa.hibernate.ddl-auto = update
spring.jpa.hibernate.naming-strategy = org.hibernate.cfg.ImprovedNamingStrategy
spring.jpa.properties.hibernate.dialect = org.hibernate.dialect.MySQL5Dialect

3、创建单表实体

• @Entity
• @Table

@Data
@Entity
@Table(name = "student")
public class Student implements Serializable {@Id@GeneratedValue(strategy = GenerationType.AUTO)private Integer id ;private String name;private Byte sex;private String numberId;
}
@Data
@Entity
public class Student {@Id@GeneratedValue(strategy = GenerationType.IDENTITY)@Column(name = "student_id")private int id;@Column(name = "student_name")private String name;@Column(name = "student_password")private String password;//多对一字段@ManyToOne(cascade = CascadeType.ALL)@JoinColumn(name = "school")private School school;//多对多字段@ManyToMany(cascade = CascadeType.ALL,mappedBy = "students")//mappedBy=“关联属性名”private Set<Teacher> teachers;
}
@Data
@Entity
@Table(name = "teacher")
public class Teacher {@Id@GeneratedValue(strategy = GenerationType.IDENTITY)@Column(name = "teacher_id")private int id;@Column(name = "teacher_name")private String name;@Column(name = "teacher_password")private String password;@ManyToOne(cascade = CascadeType.ALL)@JoinColumn(name = "school")private School school;@ManyToMany(cascade = CascadeType.ALL)@JoinTable(name = "teacher_student",//中间表名joinColumns = {@JoinColumn(name = "teacherid")},//当前对象id在中间表的列名inverseJoinColumns = {@JoinColumn(name = "studentid")}//另一张表在中间表的列名)private Set<Student> students;}@Data
@NoArgsConstructor
@AllArgsConstructor
@Entity
public class School {@Id@GeneratedValue(strategy = GenerationType.IDENTITY)@Column(name = "school_id")private int id;@Column(name = "school_name")private String name;@OneToMany(cascade = CascadeType.ALL,mappedBy = "school")private Set<Student> students;@OneToMany(cascade = CascadeType.ALL,mappedBy = "school")private Set<Teacher> teachers;
}