JPA

百度百科
JPA语法

一、依赖

        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <scope>runtime</scope>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-jpa</artifactId>
            <version>1.5.1.RELEASE</version>
        </dependency>

二、application.yml

server:
  port: 8500

spring:
  datasource:
    url: jdbc:mysql://localhost:3306/javastudy?useUnicode=true&characterEncoding=utf-8&useSSL=false&serverTimezone=Asia/Shanghai
    username: root
    password: root
    hikari:
      minimum-idle: 2
      maximum-pool-size: 5
  jpa:
    database: mysql
    show-sql: true
    hibernate:
      ddl-auto: update
    database-platform: org.hibernate.dialect.MySQL57InnoDBDialect

三、pojo实体类

@Entity
@Table(name = "表名")
@Id:主键
@GeneratedValue(strategy = GenerationType.AUTO):主键自增
@Column:对应列名

package com.example.jpa.pojo;

import javax.persistence.*;

@Entity
@Table(name = "jpa_student")
public class Student {

    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    private Long id;

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

    @Column(name = "age")
    private Integer age;

    @Column(name = "gender")
    private String gender;

    public Long getId() {
        return id;
    }

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

    public String getName() {
        return name;
    }

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

    public Integer getAge() {
        return age;
    }

    public void setAge(Integer age) {
        this.age = age;
    }

    public String getGender() {
        return gender;
    }

    public void setGender(String gender) {
        this.gender = gender;
    }

    @Override
    public String toString() {
        return "Student{" +
                "id=" + id +
                ", name='" + name + '\'' +
                ", age=" + age +
                ", gender='" + gender + '\'' +
                '}';
    }
}