制作一个网站首页公司注册
我正在尝试使用审计来在我的对象中保存dateCreated和dateUpdated,但由于我手动设置了ID,所以还有一些额外的工作.
遵循Oliver Gierke在DATAMONGO-946的建议
我想弄清楚如何正确实现它.
package hello;
import org.springframework.data.annotation.CreatedDate;
import org.springframework.data.annotation.Id;
import org.springframework.data.annotation.LastModifiedDate;
import org.springframework.data.domain.Persistable;
import java.util.Date;
public class Customer implements Persistable {
@Id
private String id;
@CreatedDate
private Date createdDate;
@LastModifiedDate
private Date lastModifiedDate;
private String firstName;
private String lastName;
private boolean persisted;
public Customer() {
}
public Customer(String firstName, String lastName) {
this.firstName = firstName;
this.lastName = lastName;
}
public void setPersisted(boolean persisted) {
this.persisted = persisted;
}
@Override
public String getId() {
return id;
}
public void setId(String id) {
this.id = id;
}
@Override
public boolean isNew() {
return !persisted;
}
@Override
public String toString() {
return String.format(
"Customer[id=%s, createdDate=%s, lastModifiedDate=%s, firstName='%s', lastName='%s']",
id, createdDate, lastModifiedDate, firstName, lastName);
}
}
和
package hello;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.CommandLineRunner;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.data.mongodb.config.EnableMongoAuditing;
@SpringBootApplication
@EnableMongoAuditing
public class Application implements CommandLineRunner {
@Autowired
private CustomerRepository repository;
public static void main(String[] args) {
SpringApplication.run(Application.class, args);
}
@Override
public void run(String... args) throws Exception {
repository.deleteAll();
// create a customer
Customer c = new Customer("Alice", "Smith");
c.setId("test_id");
// save a customer
repository.save(c);
// fetch all customers
System.out.println("Customers found with findAll():");
System.out.println("-------------------------------");
for (Customer customer : repository.findAll()) {
System.out.println(customer);
}
System.out.println();
// create another customer with same id
c = new Customer("Bob", "Smith");
c.setId("test_id");
c.setPersisted(true);
repository.save(c);
// fetch all customers
System.out.println("Customers found with findAll():");
System.out.println("-------------------------------");
for (Customer customer : repository.findAll()) {
System.out.println(customer);
}
System.out.println();
}
}
执行结果如下：
Customers found with findAll():
-------------------------------
Customer[id=test_id, createdDate=Wed Feb 24 00:43:47 WITA 2016, lastModifiedDate=Wed Feb 24 00:43:47 WITA 2016, firstName='Alice', lastName='Smith']
Customers found with findAll():
-------------------------------
Customer[id=test_id, createdDate=null, lastModifiedDate=Wed Feb 24 00:43:47 WITA 2016, firstName='Bob', lastName='Smith']
对象更新后,createdDate变为null.
我在这里错过了什么？如何正确实施Persistable使审计工作正常进行？
解决方法:
您的代码按预期工作.在实现Persistable之后,您可以看到@CreatedDate注释正在运行.
当第二次调用save时,createdDate为null,因为该对象已存在于数据库中,并且您使用createdDate = null更新了它.正如您从@CreatedDate的文档中看到的：
@CreatedDate annotation. This identifies the field whose value is set
when the entity is persisted to the database for the first time.
因此,不要在第二次调用时用null覆盖您的createdDate,您应该使用c = repository.findOne(“test_id”)从数据库中检索您的客户;然后更新它.
标签：java,spring,mongodb,spring-data,spring-data-mongodb
来源： https://codeday.me/bug/20191006/1858220.html