Share an example tutorial on connecting Java to MongoDB for addition, deletion, modification and query

This article mainly introduces the relevant information about Java connection MongoDB to perform additions, deletions, modifications and queries. Friends in need can refer to

Java connection to MongoDB for additions, deletions, modifications and queries. Operations

1. Create a database connection and perform addition, deletion, modification and query

(interface and implementation class respectively)

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);
}

Summary: It is the same as the connection of relational database, there is no difference.

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