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JPA에서 class를 통해 테이블을 정의할때 몇가지 규칙이 있습니다.
| 항목 | DB | JPA객체 | 설명 |
|---|---|---|---|
| Table(Class) | sample_table | SampleTable | 헝가리 표기법을따름 |
| Field(member) | samplename | sampleName | 카멜표기법을 따름 |
db가 설치된 os에따라 대소문자를 구분하는 경우가 있기때문에
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package com.psmon.springdb;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
@Entity // This tells Hibernate to make a table out of this class
public class User {
@Id
@GeneratedValue(strategy=GenerationType.AUTO)
private Integer id;
private String name;
private String email;
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getEmail() {
return email;
}
public void setEmail(String email) {
this.email = email;
}
} |
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| Code Block | ||||||
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package com.psmon.springdb;
import org.springframework.data.repository.CrudRepository;
//This will be AUTO IMPLEMENTED by Spring into a Bean called userRepository
//CRUD refers Create, Read, Update, Delete
public interface UserRepository extends CrudRepository<User, Long> {
}
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| Code Block | ||||||||
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package com.psmon.springdb;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.junit4.SpringRunner;
@RunWith(SpringRunner.class)
@SpringBootTest
public class JparestdemoApplicationTests {
@Autowired
private UserRepository userRepository;
@Test
public void contextLoads() {
jpaTest1();
}
public void jpaTest1() {
// 사용자 생성
User addUser = new User();
addUser.setName("minsu");
addUser.setEmail("test@x.com");
userRepository.save(addUser);
// 사용자 조회
Iterable<User> userList = userRepository.findAll();
userList.forEach(item->System.out.println(item.getName() ));
}
}
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