Spring Data JPA 中使用MySQL的TIMESTAMP數據類型

MySQL建立Timestamp數據類型字段

Spring Data JPA相關類建立

建立對應實體類

import lombok.Data;

import javax.persistence.*;
import java.io.Serializable;
import java.util.Date;

/**
 * @author LiT
 * @date 2020/5/22 15:54
 */
@Data
@Entity
@Table(name = "test")
public class Test implements Serializable {

    /**
     * 測試-主鍵
     */
    @Id
    @Column(name = "id", length = 32)
    private String id;
    /**
     * 建立時間 yyyy-MM-dd HH:mm:ss
     */
    @Column(name = "create_time", insertable = false, updatable = false, columnDefinition = "TIMESTAMP DEFAULT CURRENT_TIMESTAMP")
    private Date createTime;
    /**
     * 修改時間 yyyy-MM-dd HH:mm:ss
     */
    @Column(name = "update_time", insertable = false, updatable = false, columnDefinition = "TIMESTAMP DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP")
    private Date updateTime;

}

建立對應Repository

import com.lit.domain.Test;
import org.springframework.data.jpa.repository.JpaRepository;
import org.springframework.stereotype.Repository;

/**
 * @author LiT
 * @date 2020/5/22 16:11
 */
@Repository
public interface TestRepository extends JpaRepository<Test, String> {
}

建立簡單Service(省略接口開發)

import com.lit.domain.Test;
import com.lit.repository.TestRepository;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.util.List;
import java.util.UUID;

/**
 * @author LiT
 * @date 2020/5/22 16:14
 */
@Service
public class TestService {

    @Autowired
    private TestRepository testRepository;

    /**
     * 簡單查詢全部
     *
     * @return
     */
    private List findAll() {
        List<Test> testList = null;
        try {
            testList = testRepository.findAll();
        } catch (Exception e) {
            e.printStackTrace();
            return null;
        }
        return testList;
    }

    /**
     * 簡單插入
     *
     * @return
     */
    private Boolean save(Test test) {
        try {
            testRepository.save(test);
        } catch (Exception e) {
            e.printStackTrace();
            return false;
        }
        return true;
    }

}

建立測試Resource

import com.lit.service.TestService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

/**
 * @author LiT
 * @date 2020/5/22 16:19
 */
@RestController
@RequestMapping("/asp/test")
public class TestResource {

    @Autowired
    private TestService testService;

     /**
     * 簡單查詢全部
     *
     * @return
     */
    @GetMapping("/find-all")
    private List findAll() {
         return testService.findAll()
    }

     /**
     * 簡單插入
     *
     * @return
     */
    @PostMapping("/save")
    private Boolean save(@RequestBody Test test) {
        return testService.save(test);
    }
}

開始測試

測試插入

測試查詢

查詢數據庫數據

疑問

//觀察到數據庫時間爲2020-06-01 17:29:44 ("yyyy-MM-dd HH:mm:ss"), 
//可是java查詢出爲2020-06-01 17:29:44.0("yyyy-MM-dd HH:mm:ss E"), 
//簡單解決格式化時間
SimpleDateFormat format=new SimpleDateFormat("MM-dd HH:mm:ss E");
String time=format.format(new Date());
System.out.println("當前時間: "+time);