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| from pymongo import MongoClient
clinet = MongoClient("mongodb://localhost:27017")
db = clinet["demo"]
col = db["demo"]
print(">>> 查看数据库信息")
server_info = clinet.server_info()
print(server_info)
print(">>> 显示当前数据库服务器上的数据库名")
database_names = clinet.list_database_names()
print(database_names)
print(">>> 显示当前数据库上的全部集合名")
collection_names = db.list_collection_names()
print(collection_names)
print(">>> 插入一个文档")
demo = {
"author": "Sitoi",
"age": 22,
"title": "Sitoi-blog",
"tags": ["man", "spider"]
}
demo_id = col.insert_one(demo).inserted_id
print(demo_id)
print(">>> 插入多个文档")
demos = [
{"author": "blog", "age": 18, "title": "blog", "text": "Sitoi Blog"},
{"author": "bash", "age": 30, "title": "bash", "text": "Sitoi Blog"},
{"author": "python", "age": 50, "title": "language", "text": "Sitoi Blog"},
{"author": "mongodb", "age": 80, "title": "NoSQL", "text": "Sitoi Blog"},
{"author": "pymongo", "age": 97, "title": "Python for MongoDB", "text": "Sitoi Blog"},
]
demo_ids = col.insert_many(demos).inserted_ids
print(demo_ids)
print(">>> 查询单个文档")
query = {}
projection = None
result = col.find_one(filter=query, projection=projection)
print(result)
print(">>> 查询多个文档")
query = {}
projection = None
result = col.find(filter=query, projection=projection)
for one in result:
print(one)
print(">>> 所有字段")
results = col.find()
for one in results:
print(one)
print(">>> 用字典指定要显示的哪几个字段")
query = {}
projection = {"_id": True, "author": True}
results = col.find(filter=query, projection=projection)
for one in results:
print(one)
print(">>> 用字典指定去掉哪些字段")
query = {}
projection = {"_id": False, "author": False}
results = col.find(query, projection=projection)
for one in results:
print(one)
print(">>> 用列表指定要显示哪几个字段")
query = {}
projection = ["author", "title"]
results = col.find(filter=query, projection=projection)
for one in results:
print(one)
print(">>> 指定范围，大于等于，小于等于")
query = {"age": {"$gte": 10, "$lte": 30}}
projection = None
results = col.find(filter=query, projection=projection)
for one in results:
print(one)
print(">>> 不同字段，并列条件")
query = {"author": "Sitoi", "age": 22}
projection = None
results = col.find(filter=query, projection=projection)
for one in results:
print(one)
print(">>> 相同字段，并列条件")
query = {"age": {"$gt": 50}, "age": {"$lt": 100}}
query = {"age": {"$gte": 10, "$lte": 20}}
projection = None
results = col.find(filter=query, projection=projection)
for one in results:
print(one)
print(">>> 不同字段，或条件")
query = {"$or": [{"age": 22}, {"author": "blog"}]}
projection = None
results = col.find(filter=query, projection=projection)
for one in results:
print(one)
print(">>> 相同字段，或条件")
query = {"$or": [{"age": 22}, {"age": 18}]}
projection = None
results = col.find(filter=query, projection=projection)
for one in results:
print(one)
print(">>> 字段不存在")
query = {"text": None}
projection = None
results = col.find(filter=query, projection=projection)
for one in results:
print(one)
print(">>> 字段存在")
query = {"text": {"$ne": None}}
projection = None
results = col.find(filter=query, projection=projection)
for one in results:
print(one)
print(">>> 正则查询")
query = {"author": {"$regex": "^S.*"}}
projection = None
results = col.find(filter=query, projection=projection)
for one in results:
print(one)
print(">>> 计数")
query = {}
count = col.count_documents(filter=query)
print(count)
print(">>> 排序")
results = col.find().sort([("author", 1), ("title", -1)])
for one in results:
print(one)
print(">>> 跳过")
results = col.find().skip(1)
for one in results:
print(one)
print(">>> 限制")
results = col.find().limit(1)
for one in results:
print(one)
print(">>> 更新单个文档")
query = {"age": 18}
update = {"$set": {"age": 20}}
modified_count = col.update_one(filter=query, update=update, upsert=False).modified_count
print(modified_count)
print(">>> 更新多个文档")
query = {"text": "Sitoi Blog"}
update = {"$set": {"text": "Sitoi PyMongo"}}
modified_count = col.update_many(filter=query, update=update, upsert=False).modified_count
print(modified_count)
print(">>> 删除单个文档")
query = {"author": "Sitoi"}
delete_count = col.delete_one(filter=query).deleted_count
print(delete_count)
print(">>> 删除多个文档")
query = {}
delete_count = col.delete_many(filter=query).deleted_count
print(delete_count)
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