SpringBoot之資料庫（二）——JPA

• 1. 新增pom依賴
• 2. JPA配置
• 3. 例項開發
• 3.1 建立實體類
• 3.2 DAO
• 3.3 Service
• 3.4 Controller
• 3.5 測試
• 4. 原始碼下載

1. 新增pom依賴

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

2. JPA配置

在application.yml檔案中spring節點下配置jpa，如下：

 #JPA配置
  jpa:
    hibernate:
      ddl-auto: update
    show-sql: true

3. 例項開發

3.1 建立實體類

import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;

import javax.persistence.*;
 

import java.util.Date;

/**
 * Created by HuangJun
 * 14:01 2018/11/12
 */
@Data
@NoArgsConstructor
@AllArgsConstructor
@Entity
@Table(name="jpa_user")
public class JpaUser {
    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    private Integer id;

    @Column(nullable = false)
    private String username;
 

    @Column(nullable = false)
    private Date birthday;
    @Column(nullable = false)
    private String sex;
    @Column(nullable = false)
    private String address;

    public JpaUser(String username, Date birthday, String sex, String address) {
        this.username = username;
        this.birthday = birthday;
        this.sex = sex;
        this.address = address;
    }
}

3.2 DAO

import com.springboot.web.model.JpaUser;
import org.springframework.data.jpa.repository.JpaRepository;
import org.springframework.data.jpa.repository.Modifying;
import org.springframework.data.jpa.repository.Query;
import org.springframework.data.repository.query.Param;
import org.springframework.stereotype.Repository;

import java.util.List;

/**
 * Created by HuangJun
 * 14:06 2018/11/12
 */
@Repository
public interface JpaUserRepository  extends JpaRepository<JpaUser, Integer> {
    List<JpaUser> findByUsername(String username);
}

3.3 Service

service介面：

import com.springboot.web.model.JpaUser;

import java.util.List;

/**
 * Created by HuangJun
 * 14:11 2018/11/12
 */
public interface JpaUserService {
    List<JpaUser> findAll();
    List<JpaUser> findByUsername(String username);
    JpaUser save(JpaUser jpaUser);
    void deleteById(Integer id);
}

service實現：

import com.springboot.web.dao.JpaUserRepository;
import com.springboot.web.model.JpaUser;
import com.springboot.web.service.JpaUserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.util.List;

/**
 * Created by HuangJun
 * 14:11 2018/11/12
 */
@Service
public class JpaUserServiceImpl implements JpaUserService {

    @Autowired
    private JpaUserRepository jpaUserRepository;

    @Override
    public List<JpaUser> findAll() {
        return jpaUserRepository.findAll();
    }

    @Override
    public JpaUser save(JpaUser jpaUser) {
        return jpaUserRepository.save(jpaUser);
    }

    @Override
    public void deleteById(Integer id) {
        jpaUserRepository.deleteById(id);
    }

    @Override
    public List<JpaUser> findByUsername(String username) {
        return jpaUserRepository.findByUsername(username);
    }
}

3.4 Controller

import com.springboot.web.model.JpaUser;
import com.springboot.web.service.JpaUserService;
import com.springboot.web.utils.DateFormatUtil;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.*;

import java.util.List;

/**
 * Created by HuangJun
 * 14:23 2018/11/12
 */
@RestController
@RequestMapping("/jpaUser")
public class JpaUserController {
    @Autowired
    private JpaUserService jpaUserService;

    @GetMapping("/list")
    public List<JpaUser> findAll() {
        return jpaUserService.findAll();
    }

    @GetMapping("/findByUsername")
    public List<JpaUser> findByUsername(@RequestParam("username") String username) {
        List<JpaUser> list = jpaUserService.findByUsername(username);
        return list;
    }

    @PostMapping("/add")
    public void add(@RequestParam("username") String username,@RequestParam("birthday") String birthday,
                    @RequestParam("sex") String sex,@RequestParam("address") String address) {

        JpaUser user = new JpaUser(username, DateFormatUtil.String2Date(birthday),sex,address);
        jpaUserService.save(user);
    }

    @DeleteMapping("/deleteById/{id}")
    public void deleteUserByUserId(@PathVariable("id")  Integer id){
        jpaUserService.deleteById(id);
    }

}

3.5 測試

使用postman進行測試

測試add():

測試list():

測試findByUsername():

4. 原始碼下載

原始碼下載地址：https://download.csdn.net/download/huangjun0210/10789263