48 lines
1.6 KiB
Markdown
48 lines
1.6 KiB
Markdown
### 28.3.1. 实体类
|
||
|
||
传统上，JPA实体类被定义到一个persistence.xml文件中。在Spring Boot中，这个文件不是必需的，并被'实体扫描'替代。默认情况下，在你主（main）配置类（被@EnableAutoConfiguration或@SpringBootApplication注解的类）下的所有包都将被查找。
|
||
|
||
任何被@Entity，@Embeddable或@MappedSuperclass注解的类都将被考虑。一个普通的实体类看起来像下面这样：
|
||
```java
|
||
package com.example.myapp.domain;
|
||
|
||
import java.io.Serializable;
|
||
import javax.persistence.*;
|
||
|
||
@Entity
|
||
public class City implements Serializable {
|
||
|
||
@Id
|
||
@GeneratedValue
|
||
private Long id;
|
||
|
||
@Column(nullable = false)
|
||
private String name;
|
||
|
||
@Column(nullable = false)
|
||
private String state;
|
||
|
||
// ... additional members, often include @OneToMany mappings
|
||
|
||
protected City() {
|
||
// no-args constructor required by JPA spec
|
||
// this one is protected since it shouldn't be used directly
|
||
}
|
||
|
||
public City(String name, String state) {
|
||
this.name = name;
|
||
this.country = country;
|
||
}
|
||
|
||
public String getName() {
|
||
return this.name;
|
||
}
|
||
|
||
public String getState() {
|
||
return this.state;
|
||
}
|
||
// ... etc
|
||
}
|
||
```
|
||
**注**：你可以使用@EntityScan注解自定义实体扫描路径。具体参考[Section 67.4, “Separate @Entity definitions from Spring configuration”](http://docs.spring.io/spring-boot/docs/current-SNAPSHOT/reference/htmlsingle/#howto-separate-entity-definitions-from-spring-configuration)。
|