快捷導(dǎo)航

Spring?boot?Jpa添加對(duì)象字段使用數(shù)據(jù)庫默認(rèn)值操作

更新時(shí)間：2021年11月23日 11:01:25 作者：AgPtAu

這篇文章主要介紹了Spring?boot?Jpa添加對(duì)象字段使用數(shù)據(jù)庫默認(rèn)值操作，具有很好的參考價(jià)值，希望對(duì)大家有所幫助。如有錯(cuò)誤或未考慮完全的地方，望不吝賜教

jpa做持久層框架，項(xiàng)目中數(shù)據(jù)庫字段有默認(rèn)值和非空約束，這樣在保存對(duì)象是必須保存一個(gè)完整的對(duì)象，但在開發(fā)中我們往往只是先保存部分特殊的字段其余字段用數(shù)據(jù)庫默認(rèn)值，要是直接用idea生成實(shí)體類操作的話會(huì)報(bào)SQLIntegrityConstraintViolationException異常，我們需要jpa根據(jù)傳入的對(duì)象存在的屬性動(dòng)態(tài)生成更新和添加語句需要給實(shí)體類添加@DynamicUpdate，@DynamicInsert根據(jù)對(duì)象屬性生成動(dòng)態(tài)update和insert語句。

建庫建表

CREATE TABLE `student` (
  `id` bigint(20) NOT NULL AUTO_INCREMENT,
  `name` varchar(255) NOT NULL COMMENT '姓名',
  `age` int(3) NOT NULL DEFAULT '0' COMMENT '年齡',
  `adder` varchar(255) NOT NULL DEFAULT '北京' COMMENT '地址',
  `class` int(15) NOT NULL DEFAULT '0' COMMENT '班級(jí)',
  `is_ali` tinyint(1) NOT NULL DEFAULT '0' COMMENT '阿里認(rèn)證',
  `is_tx` tinyint(1) NOT NULL DEFAULT '0' COMMENT '騰訊認(rèn)證',
  PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=2 DEFAULT CHARSET=utf8

項(xiàng)目搭建

代碼

配置文件

spring.datasource.url=jdbc:mysql://localhost:3306/test?useUnicode=true&characterEncoding=utf-8&serverTimezone=UTC&useSSL=true
spring.datasource.username=root
spring.datasource.password=root
spring.datasource.driver-class-name=com.mysql.jdbc.Driver
spring.jpa.database=mysql
spring.jpa.hibernate.ddl-auto=update
spring.jpa.show-sql=true

StudnetController

package com.myjpa.demo.controller;
import com.myjpa.demo.service.StudentService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.PutMapping;
import org.springframework.web.bind.annotation.RestController;
@RestController
public class StudnetController {
    @Autowired
    StudentService student;
    @PutMapping("/add")
    public String insertStudent(String name, Integer age) {
        student.addStudent(name, age);
        return "添加成功";
    }
}

StudentService

package com.myjpa.demo.service;
import com.myjpa.demo.entity.StudentEntity;
import com.myjpa.demo.respository.StudentRespository;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;
@Service
@Transactional(rollbackFor = Exception.class)
public class StudentService {
    @Autowired
    StudentRespository studentRespository;
    public void addStudent(String name, Integer age) {
        StudentEntity s = new StudentEntity();
        s.setName(name);
        s.setAge(age);
        studentRespository.save(s);
    }
}

StudentRespository

package com.myjpa.demo.respository;
import com.myjpa.demo.entity.StudentEntity;
import org.springframework.data.jpa.repository.JpaRepository;
import org.springframework.stereotype.Repository;
@Repository
public interface StudentRespository extends JpaRepository<StudentEntity, Long> {
}

StudentEntity 實(shí)體類可以使用idea反向生成

package com.myjpa.demo.entity;
import org.hibernate.annotations.DynamicInsert;
import org.hibernate.annotations.DynamicUpdate;
import javax.persistence.*;
import java.util.Objects;
@Entity
@Table(name = "student", schema = "test")
public class StudentEntity {
    private long id;
    private String name;
    private int age;
    private String adder;
    private int clazz;
    private byte isAli;
    private byte isTx;
    @Id
    @Column(name = "id")
    public long getId() {
        return id;
    }
    public void setId(long id) {
        this.id = id;
    }
    @Basic
    @Column(name = "name")
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    @Basic
    @Column(name = "age")
    public int getAge() {
        return age;
    }
    public void setAge(int age) {
        this.age = age;
    }
    @Basic
    @Column(name = "adder")
    public String getAdder() {
        return adder;
    }
    public void setAdder(String adder) {
        this.adder = adder;
    }
    @Basic
    @Column(name = "class")
    public int getClazz() {
        return clazz;
    }
    public void setClazz(int clazz) {
        this.clazz = clazz;
    }
    @Basic
    @Column(name = "is_ali")
    public byte getIsAli() {
        return isAli;
    }
    public void setIsAli(byte isAli) {
        this.isAli = isAli;
    }
    @Basic
    @Column(name = "is_tx")
    public byte getIsTx() {
        return isTx;
    }
    public void setIsTx(byte isTx) {
        this.isTx = isTx;
    }
    @Override
    public boolean equals(Object o) {
        if (this == o) return true;
        if (o == null || getClass() != o.getClass()) return false;
        StudentEntity that = (StudentEntity) o;
        return id == that.id &&
                age == that.age &&
                clazz == that.clazz &&
                isAli == that.isAli &&
                isTx == that.isTx &&
                Objects.equals(name, that.name) &&
                Objects.equals(adder, that.adder);
    }
    @Override
    public int hashCode() {
        return Objects.hash(id, name, age, adder, clazz, isAli, isTx);
    }
}

DemoApplication

package com.myjpa.demo;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
@SpringBootApplication
public class DemoApplication {
    public static void main(String[] args) {
        SpringApplication.run(DemoApplication.class, args);
    }
}