Spring Boot訪問mysql(JPA方式)最簡單配置

0.先推薦一個工具——lombok,pom文件如下：

<dependency>
    <groupId>org.projectlombok</groupId>
    <artifactId>lombok</artifactId>
    <scope>compile</scope>
</dependency>

可以使用注解@Data 編譯時自動生成get,set方法,構造函數,toString方法。

@Data
@Entity
public class Account
{
    @Id
    private String id;
    private String account;
    @Column(name = "call_phone")
    private String phone;
    @Column(name = "nick_name")
    private String nickname;
    private String password;
    private String salt;
    private int userType;
    private String createUser;
    private Timestamp createTime;
    private int state;
}

生成后的效果如下：

 

1.pom.xml文件下添加如下依賴，引入spring-boot-jpa的jar包，以及mysql驅動

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

 

2.在/src/main/resources/application.properties中配置spring datasource及hibernate方言

(Spring boot 默認使用hibernate作為JPA的實現)

spring.datasource.url=jdbc:mysql://localhost:3306/test?useSSL=false
spring.datasource.username=root
spring.datasource.password=root
spring.datasource.tomcat.max-active=100
spring.datasource.tomcat.max-idle=200
spring.datasource.tomcat.initialSize=20
spring.jpa.database-platform=org.hibernate.dialect.MySQL5Dialect

 

3.定義Entity和Repository(接口)。

Entity--Account實體類如下:

  @Entity會被spring掃描並加載，

  @Id注解在主鍵上

  @Column name="call_phone" 指該字段對應的數據庫的字段名，如果相同就不需要定義。數據庫下划線間隔和代碼中的駝峰法視為相同，如數據庫字段create_time等價於Java類中的createTime，因此不需要用@Column注解。

@Data
@Entity
public class Account
{
    @Id
    private String id;
    private String account;
    @Column(name = "call_phone")
    private String phone;
    @Column(name = "nick_name")
    private String nickname;
    private String password;
    private String salt;
    private int userType;
    private String createUser;
    private Timestamp createTime;
    private int state;
}

Repository如下：

@Repository
public interface AccountRepository extends JpaRepository<Account, String>
{
    Account findOneByAccount(String account);
}

 

 

4.在其他@Component中調用

@RestController
@RequestMapping("/subsystem")
public class SubsystemAuthorityService
{
    @Autowired
    AccountRepository accountRepository;

    @PostMapping(path = "/admin/info")
    public String getAdminInfo(String currentAccount)
    {
        Account account = accountRepository.findOneByAccount(currentAccount);
        System.out.println(account);
        return account.toString();
    }
}