Teilen Sie ein Beispiel-Tutorial zum Verbinden von Java mit MongoDB zum Hinzufügen, Löschen, Ändern und Abfragen

package com.dao;

import java.util.List;

import org.springframework.beans.factory.annotation.Autowired;
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.stereotype.Repository;

import com.bean.Company;

@Repository
public class RepositoryImpl implements AbstractRepository {
  @Autowired
  private MongoTemplate mongoTemplate;

  // 查询所有数据
  public List<?> findAll(Class<?> entity) {
    return mongoTemplate.findAll(entity);
  }

  // 更新数据
  public Company findOne(String id, Class<?> entity) {
    return (Company) mongoTemplate.findOne(new Query(Criteria.where("id")
        .is(id)), entity);

  }

  // 添加到数据库
  public void updateEntity(Company company) {
    mongoTemplate.save(company);
  }

  // 删除选中的数据
  public void delete(String id, Class<Company> class1) {
    Criteria criteria = Criteria.where("id").in(id);
    if (criteria != null) {
      Query query = new Query(criteria);
      if (query != null && mongoTemplate.findOne(query, class1) != null)
        mongoTemplate.remove(mongoTemplate.findOne(query, class1));
    }

  }
  //增加到数据库
  public void insert(Company company) {
    mongoTemplate.insert(company);
    
  }

}

package com.dao;

import java.util.List;

import com.bean.Company;

public interface AbstractRepository {
  public List<?> findAll(Class<?> entity);
  
  public Company findOne(String id,Class<?> entity);

  public void updateEntity(Company company);

  public void delete(String id, Class<Company> class1);

  public void insert(Company company);
}