SpringBoot（四）：连接MySQL，JPA操作

pom.xml:

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

        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <scope>runtime</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
    </dependencies>

application.properties

spring.datasource.url=jdbc:mysql://127.0.0.1:3306/test?useUnicode=true&characterEncoding=UTF-8
spring.datasource.username=root
spring.datasource.password=
spring.datasource.driver-class-name=com.mysql.jdbc.Driver

spring.jpa.hibernate.ddl-auto=update
spring.jpa.show-sql=true

实体类：

@Entity  
public class Person  {  
  
    @Id  
    @GeneratedValue  
    private Long id;  
      
    private String name;  
      
    private Integer age;  
      
    private String address;  
  
    public Person() {  
        super();  
    }  
  
    public Person(Long id, String name, Integer age, String address) {  
        super();  
        this.id = id;  
        this.name = name;  
        this.age = age;  
        this.address = address;  
    }  
  
    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 getAddress() {  
        return address;  
    }  
  
    public void setAddress(String address) {  
        this.address = address;  
    }  
      
}  

Dao类：

@Repository  
public interface PersonRepository extends JpaRepository<Person,Long> {  
  
    List<Person> findByName(String name);  
      
    List<Person> findByAddress(String address);  
      
    List<Person> findByNameAndAddress(String name,String address);  
      
    @Query("select p from Person p where p.name=:name and p.address=:address")  
    List<Person> withNameAndAddressQuery(@Param("name")String Name,@Param("address")String address);  
}  

controller：

@RestController
@SpringBootApplication
public class SpringBootSampleMysqlApplication {

    @Autowired
    PersonRepository dao;

    @RequestMapping("/get")
    public Person getP(String name){
        Person person = dao.findByName(name).get(0);
        return person;
    }

    @RequestMapping("/getByAddress")
    public List<Person> getByAddress(String address){
        List<Person> list = dao.findByAddress(address);
        return list;
    }

    public static void main(String[] args) {
        SpringApplication.run(SpringBootSampleMysqlApplication.class, args);
    }
}

测试：