一、缘由

　　这是之前学习的时候写下的基础代码，包含着MongDB数据库和Python交互的基本操作。

二、代码实现

import pymongo

#连接数据库
client=pymongo.MongoClient(host='localhost',port=27017)
#制定数据库
db=client.test
#指定或生成文档集合
collection=db.students


'''
插入数据
'''
#在文档集合里面插入一条数据
student={
    'id':'20170101',
    "name":"Jordan",
    "gender":"male"
}

result=collection.insert_one(student)
print(result)

#在集合里面插入多条数据
student1={
    'id':'20170101',
    "name":'Jordan',
    "gender":'male'
}
student2={
    'id':'20170202',
    'name':'Mike',
    'age':21,
    "gender":'male'
}


result=collection.insert_many([student1,student2])
print(result)


'''
查询
'''
# result=collection.find_one({'name':'Mike'})
# print(result)
# results=collection.find({'name':{"$gt":20}})
# print(results)
# for result in results:
#     print(result)

'''
计数
'''
count=collection.count_documents({'age':{"$gt":20}})
print(count)


'''
排序
'''
results=collection.find().sort('name',pymongo.ASCENDING)

for result in results:
    print(result['name'] )

'''
偏移
'''
#跳过
results=collection.find().sort('name',pymongo.ASCENDING).skip(2)
print([result['name']  for result in results])
#限制
results=collection.find().sort('name',pymongo.ASCENDING).limit(2)
print([result['name'] for result in results])

'''
更新
'''

condition={'name':'Mike'}
students={"$set":{'age':26}}
result=collection.update_many(condition,students)
print(result.modified_count)


results=collection.find()
print([result for result in results])