本文介绍了SpringBoot集成JPA的示例代码，分享给大家，具体如下：
1.创建新的maven项目
2. 添加必须的依赖
<!--springboot的必须依赖-->
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>1.5.9.RELEASE</version>
</parent>
<dependencies>
<!--启动springmvc的相关配置,springboot的自动配置-->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<!--jpa-->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>
<!--mysql驱动-->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
</dependency>
</dependencies>
3. 新建springboot启动类
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
@SpringBootApplication
public class Application {
public static void main(String[] args) {
SpringApplication.run(Application.class,args);
}
}
4. 在resources跟目录下新建application.properties
#建立/更新数据表的配置 spring.jpa.hibernate.ddl-auto=update #数据库地址 spring.datasource.url=jdbc:mysql://localhost:3306/qian?useUnicode=true&characterEncoding=utf-8 #数据库用户名 spring.datasource.username=root #数据库密码 spring.datasource.password=123
5. 新建实体类User
这个时候其实已经可以启动springboot, 但是不会生成数据表,因为还没有配置实体类的jpa
先新建user.java
import org.hibernate.annotations.GenericGenerator;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
/**
* Created by Andy on 2018/1/20.
*/
//表明这是个需要生成数据表的类
@Entity
public class User {
// 定义主键id
@Id
// 声明一个策略通用生成器，name为”system-uuid”,策略strategy为”uuid”。
@GenericGenerator(name = "system-uuid", strategy ="uuid")
// 用generator属性指定要使用的策略生成器。
@GeneratedValue(generator = "system-uuid")
private String id;
private String name;
private Integer age;
private Boolean sex;
public String getId() {
return id;
}
public void setId(String 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 Boolean getSex() {
return sex;
}
public void setSex(Boolean sex) {
this.sex = sex;
}
}
这时候启动项目,就会在指定位置下生成一个user数据表
6. 实现CRUD
CrudRepository是一个提供了普通增删改查方法的接口,由spring内部提供,我们只需调用即可
@NoRepositoryBean
public interface CrudRepository<T, ID extends Serializable> extends Repository<T, ID> {
<S extends T> S save(S var1);
<S extends T> Iterable<S> save(Iterable<S> var1);
T findOne(ID var1);
boolean exists(ID var1);
Iterable<T> findAll();
Iterable<T> findAll(Iterable<ID> var1);
long count();
void delete(ID var1);
void delete(T var1);
void delete(Iterable<? extends T> var1);
void deleteAll();
}
新建UserRepository.java
public interface UserRepository extends CrudRepository<User, String> {
}
7. 实现controller控制
新建UserController.java
@RestController
public class UserController {
@Autowired
private UserRepository userRepository;
@RequestMapping("/add")
public User add(String name){
User user = new User();
user.setName(name);
return userRepository.save(user);
}
@RequestMapping("/list")
public Iterable<User> list(){
Iterable<User> all = userRepository.findAll();
return all;
}
}
