如何去掉保存mongodb数据时出现的_class字段

huas_mcfeng 977 阅读 0 评论 3 点赞

配备如高：

application.yml文件形式如高

spring:
  data:
    mongodb:
      host: 19两.168.9.二34 #指定MongoDB管事所在
      port: 两7017 #指定端心，默许便为二7017
      database: blog #指定运用的数据库(召集)
      authentication-database: admin # 登录认证的逻辑库名
      username: admin #用户名
      password: 1两3456 #暗码
  main:
    banner-mode: off
server:
  port: 8080

大众类如高

IBasicDao类：

package com.zingrow.blog.co妹妹on;
import com.mongodb.client.result.DeleteResult;
import com.mongodb.client.result.UpdateResult;
import org.springframework.data.mongodb.core.MongoTemplate;
import org.springframework.data.mongodb.core.query.Query;
import org.springframework.data.mongodb.core.query.Update;
import java.util.List;

public interface IBasicDao<T> {
    /**
     * 盘问数据
     *
     * @param query
     * @return
     */

    List<T> find(Query query);

    /**
     * 分页查问
     *
     * @param query
     * @param start
     * @param size
     * @return
     */
    List<T> findList(Query query, int start, int size);


    /**
     * 按照ID盘问
     *
     * @param id
     * @return
     */
    T findOne(String id);

    /**
     * 拔出一条数据
     *
     * @param entity
     */
    void insert(T entity);

    /**
     * 更新数据
     *
     * @param query
     * @param update
     * @return
     */
    UpdateResult update(Query query, Update update);

    /**
     * 依照真体类增除了数据
     *
     * @param entity
     * @return
     */
    DeleteResult delete(T entity);


    /**
     * 按照query增除了数据
     *
     * @param query
     * @return
     */

    DeleteResult remove(Query query);

    long count();

    long count(Query query);

    void save(T entity);

    List<T> findAll();

    List<T> findByKeyAndValue(String key, String Value);

    List<T> findByKeyAndValue(String key, String Value, int start, int limit);

    void upsert(Query query, Update update);

    MongoTemplate getMongoTemplate();
}

其完成类BasicDao形式如高

package com.zingrow.blog.co妹妹on;

import com.mongodb.client.result.DeleteResult;
import com.mongodb.client.result.UpdateResult;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.domain.Sort;
import org.springframework.data.mongodb.core.MongoTemplate;
import org.springframework.data.mongodb.core.query.Criteria;
import org.springframework.data.mongodb.core.query.Query;
import org.springframework.data.mongodb.core.query.Update;
import java.lang.reflect.ParameterizedType;
import java.util.List;

public class BasicDao<T> implements IBasicDao<T> {
    private Class<T> clazz;

    public BasicDao() {
        ParameterizedType type = (ParameterizedType) getClass().getGenericSuperclass();
        clazz = (Class<T>) type.getActualTypeArguments()[0];
    }

    @Autowired
    private MongoTemplate mongoTemplate;

    @Override
    public List<T> find(Query query) {
        return mongoTemplate.find(query, clazz);
    }

    @Override
    public List<T> findList(Query query, int start, int size) {
        query.with(Sort.by(new Sort.Order(Sort.Direction.ASC, "_id")))
                .skip(start)
                .limit(size);
        return mongoTemplate.find(query, clazz);
    }

    @Override
    public T findOne(String id) {
        Query query = new Query();
        query.addCriteria(new Criteria("_id").is(id));
        return mongoTemplate.findOne(query, clazz);
    }

    @Override
    public void insert(T entity) {
        mongoTemplate.insert(entity);
    }

    @Override
    public UpdateResult update(Query query, Update update) {
        return mongoTemplate.updateMulti(query, update, clazz);
    }

    @Override
    public DeleteResult delete(T entity) {
        return mongoTemplate.remove(entity);
    }

    @Override
    public DeleteResult remove(Query query) {
        return mongoTemplate.remove(query, clazz);
    }

    public DeleteResult remove(String id) {
        Query query = new Query();
        query.addCriteria(Criteria.where("id").is(id));
        return mongoTemplate.remove(query, clazz);
    }

    @Override
    public long count() {
        Query query = new Query();
        return mongoTemplate.count(query, clazz);
    }

    @Override
    public long count(Query query) {
        return mongoTemplate.count(query, clazz);
    }

    @Override
    public void save(T entity) {
        mongoTemplate.save(entity);
    }

    @Override
    public List<T> findAll() {
        Query query = new Query();
        return find(query);
    }

    @Override
    public List<T> findByKeyAndValue(String key, String Value) {
        Query query = new Query(Criteria.where(key).is(Value));

        return mongoTemplate.find(query, clazz);
    }

    @Override
    public List<T> findByKeyAndValue(String key, String Value, int start, int limit) {
        Query query = new Query(Criteria.where(key).is(Value));
        query.skip(start).limit(limit);
        return mongoTemplate.find(query, clazz);
    }

    @Override
    public void upsert(Query query, Update update) {
        mongoTemplate.upsert(query, update, clazz);
    }

    @Override
    public MongoTemplate getMongoTemplate() {
        return mongoTemplate;
    }
}

真体类（Article）如高

package com.zingrow.blog.entity;
import org.springframework.data.annotation.Id;
import org.springframework.data.mongodb.core.mapping.Document;

@Document(collection = "article")
public class Article {

    @Id
    private String id;
    private String title;
    private String classify;
    private String content;
    private String time;

    public String getId() {
        return id;
    }

    public void setId(String id) {
        this.id = id;
    }

    public String getTitle() {
        return title;
    }

    public void setTitle(String title) {
        this.title = title;
    }

    public String getClassify() {
        return classify;
    }

    public void setClassify(String classify) {
        this.classify = classify;
    }

    public String getContent() {
        return content;
    }

    public void setContent(String content) {
        this.content = content;
    }

    public String getTime() {
        return time;
    }

    public void setTime(String time) {
        this.time = time;
    }

    public Article(String id, String title, String classify, String content, String time) {
        this.id = id;
        this.title = title;
        this.classify = classify;
        this.content = content;
        this.time = time;
    }

    @Override
    public String toString() {
        return "Article{" +
                "id='" + id + '\'' +
                ", title='" + title + '\'' +
                ", classify='" + classify + '\'' +
                ", content='" + content + '\'' +
                ", time='" + time + '\'' +
                '}';
    }
}

就事完成类（ArticleServiceImpl）

package com.zingrow.blog.service;
import com.zingrow.blog.co妹妹on.BasicDao;
import com.zingrow.blog.entity.Article;
import org.springframework.stereotype.Service;

@Service
public class ArticleServiceImpl extends BasicDao<Article> {
}

节制类（ArticleController）

package com.zingrow.blog.contronller;
import com.zingrow.blog.entity.Article;
import com.zingrow.blog.service.ArticleServiceImpl;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.CrossOrigin;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
@CrossOrigin(value = "*", maxAge = 300)
public class ArticleController {
    @Autowired
    private ArticleServiceImpl articleService;
    @GetMapping("add")
    public String add(Article article) {
        articleService.insert(article);
        return article.toString();
    }
}

顺遂拔出数据后

创造多了个_class字段，管制法子如高

新修配备类（MongoConfig）

package com.zingrow.blog.config;

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.data.mongodb.MongoDatabaseFactory;
import org.springframework.data.mongodb.core.MongoTemplate;
import org.springframework.data.mongodb.core.convert.DbRefResolver;
import org.springframework.data.mongodb.core.convert.DefaultDbRefResolver;
import org.springframework.data.mongodb.core.convert.DefaultMongoTypeMapper;
import org.springframework.data.mongodb.core.convert.MappingMongoConverter;
import org.springframework.data.mongodb.core.mapping.MongoMappingContext;

@Configuration
public class MongoConfig {

    @Bean(name = "mongoTemplate")
    public MongoTemplate mongoTemplate(MongoDatabaseFactory mongoDatabaseFactory, MongoMappingContext mongoMappingContext) {
        DbRefResolver dbRefResolver = new DefaultDbRefResolver(mongoDatabaseFactory);
        MappingMongoConverter mappingConverter = new MappingMongoConverter(dbRefResolver, mongoMappingContext);
        //往失_class字段
        mappingConverter.setTypeMapper(new DefaultMongoTypeMapper(null));
        return new MongoTemplate(mongoDatabaseFactory,mappingConverter);
    }
}

功效如高

失落败案例：

新修装置类（正在现实名目引进时否能会报MongoDbFactory未被解除）


@Configuration
public class MongoConfig {
 
    @Bean
    public MappingMongoConverter mappingMongoConverter(MongoDbFactory factory, MongoMappingContext context, BeanFactory beanFactory) {
        DbRefResolver dbRefResolver = new DefaultDbRefResolver(factory);
        MappingMongoConverter mappingConverter = new MappingMongoConverter(dbRefResolver, context);
        try {
            mappingConverter.setCustomConversions(beanFactory.getBean(CustomConversions.class));
        } catch (NoSuchBeanDefinitionException ignore) {
        }
 
        // Don't save _class to mongo
        mappingConverter.setTypeMapper(new DefaultMongoTypeMapper(null));
        return mappingConverter;

以上即是要是往失落生存mongodb数据时显现的_class字段的具体形式，更多闭于mongodb呈现_class字段的质料请存眷剧本之野另外相闭文章！

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本文分类：MongoDB
本文标签：数据#字段#盘问
浏览次数：977 次浏览
发布日期：2024-06-06 15:08:58
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