Spring 数据 mongoDb 不是像 Spring 数据 Jpa 那样的 null 注释 [英] Spring data mongoDb not null annotation like Spring data Jpa

问题描述

像 spring-data-jpa 一样有 @NotNull 注释，在 spring-data-mongodb 中可以用什么来做这个.?

Like spring-data-jpa have @NotNull annotation what can be used for this in spring-data-mongodb.?

推荐答案

javax.validation.constraints.NotNull 本身可以与 spring-data-mongodb 一起使用.为此，您需要有以下人员.

javax.validation.constraints.NotNull itself could be used with spring-data-mongodb. For this you need to have following in place.

在 pom.xml 中添加了 JSR-303 依赖项

<dependency>
    <groupId>org.hibernate</groupId>
    <artifactId>hibernate-validator</artifactId>
    <version>5.3.4.Final</version>
</dependency>

声明适当的验证器和验证器事件监听器

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.data.mongodb.core.mapping.event.ValidatingMongoEventListener;
import org.springframework.validation.beanvalidation.LocalValidatorFactoryBean;

@Configuration
public class Configuration {
    @Bean
    public ValidatingMongoEventListener validatingMongoEventListener() {
        return new ValidatingMongoEventListener(validator());
    }

    @Bean
    public LocalValidatorFactoryBean validator() {
        return new LocalValidatorFactoryBean();
    }
}

在 MongoDB POJO 中添加 @NotNull 注释

import org.springframework.data.annotation.Id;
import org.springframework.data.mongodb.core.mapping.Document;
import javax.validation.constraints.NotNull;

@Document(collection = "user_account")
public class User {
    @Id
    private String userId;

    @NotNull(message = "User's first name must not be null")
    private String firstName;

    @NotNull(message = "User's last name must not be null")
    private String lastName;
}

使用此配置和实现，如果您使用空值持久化 User 对象，那么您将看到 javax.validation.ConstraintViolationException

With this configuration and implementation, if you persist User object with null values, then you will see failure with javax.validation.ConstraintViolationException

记住:如果使用 @SpringBootApplication，请确保 Spring 可以扫描您的配置文件.否则，您可以使用 @ComponentScan("com.mypackage").

Remember: if using @SpringBootApplication, make sure that Spring can scan your Configuration file. Otherwise, you may use @ComponentScan("com.mypackage").

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