{"id":1056,"date":"2023-03-24T09:47:07","date_gmt":"2023-03-24T01:47:07","guid":{"rendered":""},"modified":"2023-03-24T09:47:07","modified_gmt":"2023-03-24T01:47:07","slug":"Python mongodb","status":"publish","type":"post","link":"https:\/\/bianchenghao6.com\/1056.html","title":{"rendered":"Python mongodb"},"content":{"rendered":"


\n <\/head>
\n <\/p>\n

\n

Python mongodb<\/h1>\n

\u641e\u61c2Python mongodb\u7684\u57fa\u672c\u64cd\u4f5c<\/span>\n <\/div>\n

PyMongo<\/h2>\n
\n MongoDB \u662f\u76ee\u524d\u6700\u6d41\u884c\u7684 NoSQL \u6570\u636e\u5e93\u4e4b\u4e00\uff0c\u4f7f\u7528\u7684\u6570\u636e\u7c7b\u578b BSON\uff08\u7c7b\u4f3c JSON\uff09\uff0cPython \u8981\u8fde\u63a5 MongoDB \u9700\u8981 MongoDB \u9a71\u52a8\uff0c\u8fd9\u91cc\u6211\u4eec\u4f7f\u7528 PyMongo \u9a71\u52a8\u6765\u8fde\u63a5\u3002\n <\/div>\n

pip \u5b89\u88c5<\/h3>\n
\n pip \u662f\u4e00\u4e2a\u901a\u7528\u7684 Python \u5305\u7ba1\u7406\u5de5\u5177\uff0c\u63d0\u4f9b\u4e86\u5bf9 Python \u5305\u7684\u67e5\u627e\u3001\u4e0b\u8f7d\u3001\u5b89\u88c5\u3001\u5378\u8f7d\u7684\u529f\u80fd\u3002\n <\/div>\n
\n \u5b89\u88c5 pymongo:\n <\/div>\n
\n
 $ python -m pip3 install pymongo <\/span><\/code><\/pre>\n<\/p><\/div>\n
\n    \u4e5f\u53ef\u4ee5\u6307\u5b9a\u5b89\u88c5\u7684\u7248\u672c:\n  <\/div>\n
\n
 $ python -m pip3 install pymongo==3.5.1 <\/span><\/code><\/pre>\n<\/p><\/div>\n
\n    \u66f4\u65b0 pymongo \u547d\u4ee4\uff1a\n  <\/div>\n
\n
 $ python -m pip3 install --upgrade pymongo <\/span><\/code><\/pre>\n<\/p><\/div>\n
easy_install \u5b89\u88c5<\/h3>\n
\n    \u65e7\u7248\u7684 Python \u53ef\u4ee5\u4f7f\u7528 easy_install \u6765\u5b89\u88c5\uff0ceasy_install \u4e5f\u662f Python \u5305\u7ba1\u7406\u5de5\u5177\u3002\n  <\/div>\n
\n
 $ python -m easy_install pymongo <\/span><\/code><\/pre>\n<\/p><\/div>\n
\n    \u66f4\u65b0 pymongo \u547d\u4ee4\uff1a\n  <\/div>\n
\n
 $ python -m easy_install -U pymongo <\/span><\/code><\/pre>\n<\/p><\/div>\n
\u6d4b\u8bd5 PyMongo<\/h3>\n
\n    \u63a5\u4e0b\u6765\u6211\u4eec\u53ef\u4ee5\u521b\u5efa\u4e00\u4e2a\u6d4b\u8bd5\u6587\u4ef6 test_mongodb.py\uff0c\u4ee3\u7801\u5982\u4e0b\uff1a\n  <\/div>\n
\n
 import <\/span>pymongo
 <\/span><\/code><\/pre>\n<\/p><\/div>\n
\n    \u6267\u884c\u4ee5\u4e0a\u4ee3\u7801\u6587\u4ef6\uff0c\u5982\u679c\u6ca1\u6709\u51fa\u73b0\u9519\u8bef\uff0c\u8868\u793a\u5b89\u88c5\u6210\u529f\u3002\n  <\/div>\n
\u521b\u5efa\u6570\u636e\u5e93<\/h2>\n
\n    \u521b\u5efa\u6570\u636e\u5e93\u9700\u8981\u4f7f\u7528 MongoClient \u5bf9\u8c61\uff0c\u5e76\u4e14\u6307\u5b9a\u8fde\u63a5\u7684 URL \u5730\u5740\u548c\u8981\u521b\u5efa\u7684\u6570\u636e\u5e93\u540d\u3002\n  <\/div>\n
\n    \u5982\u4e0b\u5b9e\u4f8b\u4e2d\uff0c\u6211\u4eec\u521b\u5efa\u7684\u6570\u636e\u5e93 testdb :\n  <\/div>\n
\n
 import <\/span>pymongo
  
 myclient = pymongo.MongoClient<\/span>(\"mongodb:\/\/localhost:27017\/\"<\/span>)
 mydb = myclient[\"testdb\"<\/span>]
 <\/span><\/code><\/pre>\n<\/p><\/div>\n
\n   \u6ce8\u610f\uff1a<\/span>\u5728 MongoDB \u4e2d\uff0c\u6570\u636e\u5e93\u53ea\u6709\u5728\u5185\u5bb9\u63d2\u5165\u540e\u624d\u4f1a\u771f\u6b63\u521b\u5efa\u3002\n  <\/div>\n
\u5224\u65ad\u6570\u636e\u5e93\u662f\u5426\u5df2\u5b58\u5728<\/h3>\n
\n    \u6211\u4eec\u53ef\u4ee5\u8bfb\u53d6 MongoDB \u4e2d\u7684\u6240\u6709\u6570\u636e\u5e93\uff0c\u5e76\u5224\u65ad\u6307\u5b9a\u7684\u6570\u636e\u5e93\u662f\u5426\u5b58\u5728\uff1a\n  <\/div>\n
\n
 import <\/span>pymongo
  
 myclient = pymongo.MongoClient<\/span>('mongodb:\/\/localhost:27017\/'<\/span>)
  
 dblist = myclient.list_database_names<\/span>()
 # dblist = myclient.database_names<\/span>() 
<\/span> if <\/span>\"testdb\"<\/span> in <\/span>dblist:
   print(\"\u6570\u636e\u5e93\u5df2\u5b58\u5728\uff01\"<\/span>)
 <\/span><\/code><\/pre>\n<\/p><\/div>\n
\u521b\u5efa\u96c6\u5408<\/h2>\n
\n    MongoDB \u4e2d\u7684\u96c6\u5408\u7c7b\u4f3c SQL \u7684\u8868\u3002MongoDB \u4f7f\u7528\u6570\u636e\u5e93\u5bf9\u8c61\u6765\u521b\u5efa\u96c6\u5408\uff0c\u5b9e\u4f8b\u5982\u4e0b\uff1a\n  <\/div>\n
\n
 import <\/span>pymongo
 myclient = pymongo.MongoClient<\/span>(\"mongodb:\/\/localhost:27017\/\"<\/span>)
 mydb = myclient[\"testdb\"<\/span>]
 mycol = mydb[\"sites\"<\/span>]
 <\/span><\/code><\/pre>\n<\/p><\/div>\n
\n   \u6ce8\u610f\uff1a<\/span>\u5728 MongoDB \u4e2d\uff0c\u96c6\u5408\u53ea\u6709\u5728\u5185\u5bb9\u63d2\u5165\u540e\u624d\u4f1a\u521b\u5efa!\n  <\/div>\n
\u5224\u65ad\u96c6\u5408\u662f\u5426\u5df2\u5b58\u5728<\/h3>\n
\n    \u6211\u4eec\u53ef\u4ee5\u8bfb\u53d6 MongoDB \u6570\u636e\u5e93\u4e2d\u7684\u6240\u6709\u96c6\u5408\uff0c\u5e76\u5224\u65ad\u6307\u5b9a\u7684\u96c6\u5408\u662f\u5426\u5b58\u5728\uff1a\n  <\/div>\n
\n
 import <\/span>pymongo
  
 myclient = pymongo.MongoClient<\/span>('mongodb:\/\/localhost:27017\/'<\/span>)
 mydb = myclient['testdb'<\/span>]
 collist = mydb. list_collection_names<\/span>()
 # collist = mydb.collection_names<\/span>()
<\/span> # \u5224\u65ad sites \u96c6\u5408\u662f\u5426\u5b58\u5728
<\/span> if <\/span>\"sites\"<\/span> in <\/span>collist: 
   print(\"\u96c6\u5408\u5df2\u5b58\u5728\uff01\"<\/span>)
 <\/span><\/code><\/pre>\n<\/p><\/div>\n
\n   \u6ce8\u610f\uff1a<\/span>collection_names \u5728\u6700\u65b0\u7248\u672c\u7684 Python \u4e2d\u5df2\u5e9f\u5f03\uff0cPython3.7+ \u4e4b\u540e\u7684\u7248\u672c\u6539\u4e3a\u4e86 list_collection_names()\u3002\n  <\/div>\n
\u63d2\u5165\u6587\u6863<\/h2>\n
\n    MongoDB \u4e2d\u7684\u4e00\u4e2a\u6587\u6863\u7c7b\u4f3c SQL \u8868\u4e2d\u7684\u4e00\u6761\u8bb0\u5f55,\u96c6\u5408\u4e2d\u63d2\u5165\u6587\u6863\u4f7f\u7528 insert_one() \u65b9\u6cd5\uff0c\u8be5\u65b9\u6cd5\u7684\u7b2c\u4e00\u53c2\u6570\u662f\u5b57\u5178 name => value \u5bf9\u3002\u4ee5\u4e0b\u5b9e\u4f8b\u5411 sites\u96c6\u5408\u4e2d\u63d2\u5165\u6587\u6863\uff1a\n  <\/div>\n
\n
 import <\/span>pymongo
  
 myclient = pymongo.MongoClient<\/span>(\"mongodb:\/\/localhost:27017\/\"<\/span>)
 mydb = myclient[\"testdb\"<\/span>]
 mycol = mydb[\"sites\"<\/span>]
 mydict = { \"name\"<\/span>: \"Lidihuo\"<\/span>, \"url\"<\/span>: \"https:\/\/www.lidihuo.com\"<\/span> }
 x = mycol.insert_one<\/span>(mydict) 
 <\/span><\/code><\/pre>\n<\/p><\/div>\n
\u8fd4\u56de _id \u5b57\u6bb5<\/h3>\n
\n   insert_one()<\/b>\u65b9\u6cd5\u8fd4\u56de InsertOneResult \u5bf9\u8c61\uff0c\u8be5\u5bf9\u8c61\u5305\u542b inserted_id \u5c5e\u6027\uff0c\u5b83\u662f\u63d2\u5165\u6587\u6863\u7684 id \u503c\u3002\n  <\/div>\n
\n
 import <\/span>pymongo
  
 myclient = pymongo.MongoClient<\/span>('mongodb:\/\/localhost:27017\/'<\/span>)
 mydb = myclient['testdb'<\/span>]
 mycol = mydb[\"sites\"<\/span>]
 mydict = { \"name\"<\/span>: \"Google\"<\/span>, \"url\"<\/span>: \"https:\/\/www.google.com\"<\/span> }
 x = mycol.insert_one<\/span>(mydict)
 print(x.inserted_id)
 <\/span><\/code><\/pre>\n<\/p><\/div>\n
\n    \u8fd0\u884c\u7ed3\u679c\uff1a\n  <\/div>\n
\n
5f17ddeaf99e553262c65b88<\/span><\/code><\/pre>\n<\/p><\/div>\n
\u63d2\u5165\u591a\u4e2a\u6587\u6863<\/h3>\n
\n    \u96c6\u5408\u4e2d\u63d2\u5165\u591a\u4e2a\u6587\u6863\u4f7f\u7528
\n   insert_many()<\/b>\u65b9\u6cd5\uff0c\u8be5\u65b9\u6cd5\u7684\u7b2c\u4e00\u53c2\u6570\u662f\u5b57\u5178\u5217\u8868\u3002\n  <\/div>\n
\n
 import <\/span>pymongo
  
 myclient = pymongo.MongoClient<\/span>(\"mongodb:\/\/localhost:27017\/\"<\/span>)
 mydb = myclient[\"testdb\"<\/span>]
 mycol = mydb[\"sites\"<\/span>]
 mylist = [
   { \"name\"<\/span><\/span><\/span><\/span><\/span>: \"Taobao\"<\/span>,\"url\"<\/span><\/span><\/span><\/span><\/span>: \"https:\/\/www.taobao.com\"<\/span> },
   { \"name\": \"QQ\"<\/span>, \"url\": \"https:\/\/www.qq.com\"<\/span> },
   { \"name\": \"Facebook\"<\/span>, \"url\": \"https:\/\/www.facebook.com\"<\/span> },
   { \"name\": \"\u77e5\u4e4e\"<\/span>,\"url\": \"https:\/\/www.zhihu.com\"<\/span> },
   { \"name\": \"Github\"<\/span>,\"url\": \"https:\/\/www.github.com\"<\/span> }
 ]
 x = mycol.insert_many<\/span>(mylist)
 # \u8f93\u51fa\u63d2\u5165\u7684\u6240\u6709\u6587\u6863\u5bf9\u5e94\u7684 _id \u503c
<\/span> print(x.inserted_ids)
 <\/span><\/code><\/pre>\n<\/p><\/div>\n
\n   insert_many()<\/span> \u65b9\u6cd5\u8fd4\u56de InsertManyResult \u5bf9\u8c61\uff0c\u8be5\u5bf9\u8c61\u5305\u542b inserted_ids \u5c5e\u6027\uff0c\u8be5\u5c5e\u6027\u4fdd\u5b58\u7740\u6240\u6709\u63d2\u5165\u6587\u6863\u7684 id \u503c\u3002\n  <\/div>\n
\n    \u8fd0\u884c\u7ed3\u679c\uff1a\n  <\/div>\n
\n
[ObjectId('5f17de561d5e8966224d5734'), ObjectId('5f17de561d5e8966224d5735'), ObjectId('5f17de561d5e8966224d5736'), ObjectId('5f17de561d5e8966224d5737'), ObjectId('5f17de561d5e8966224d5738')]<\/span><\/code><\/pre>\n<\/p><\/div>\n
\u63d2\u5165\u6307\u5b9a _id \u7684\u591a\u4e2a\u6587\u6863<\/h3>\n
\n    \u6211\u4eec\u4e5f\u53ef\u4ee5\u81ea\u5df1\u6307\u5b9a id\uff0c\u63d2\u5165\uff0c\u4ee5\u4e0b\u5b9e\u4f8b\u6211\u4eec\u5728 site2 \u96c6\u5408\u4e2d\u63d2\u5165\u6570\u636e\uff0c_id \u4e3a\u6211\u4eec\u6307\u5b9a\u7684\uff1a\n  <\/div>\n
\n
 import <\/span>pymongo
  
 myclient = pymongo.MongoClient<\/span>(\"mongodb:\/\/localhost:27017\/\"<\/span>)
 mydb = myclient[\"testdb\"<\/span>]
 mycol = mydb[\"site2\"<\/span>]
  
 mylist = [
   { \"_id\"<\/span><\/span><\/span><\/span><\/span>: 1, \"name\"<\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span>: \"Lidihuo\"<\/span>, \"name\": \"\u7acb\u5730\u8d27\"<\/span>},
   { \"_id\": 2, \"name\": \"Google\"<\/span>, \"name\": \"Google \u641c\u7d22\"<\/span>},
   { \"_id\": 3, \"name\": \"Facebook\"<\/span>, \"name\": \"\u8138\u4e66\"<\/span>},
   { \"_id\": 4, \"name\": \"Taobao\"<\/span>, \"name\": \"\u6dd8\u5b9d\"<\/span>},
   { \"_id\": 5, \"name\": \"Zhihu\"<\/span>, \"name\": \"\u77e5\u4e4e\"<\/span>}
 ]
 x = mycol.insert_many<\/span>(mylist)
 # \u8f93\u51fa\u63d2\u5165\u7684\u6240\u6709\u6587\u6863\u5bf9\u5e94\u7684 _id \u503c
<\/span> print(x.inserted_ids)
 <\/span><\/code><\/pre>\n<\/p><\/div>\n
\n    \u6267\u884c\u7ed3\u679c\uff1a\n  <\/div>\n
\n
 [1, 2, 3, 4, 5] <\/span><\/code><\/pre>\n<\/p><\/div>\n
\u67e5\u8be2\u6587\u6863<\/h2>\n
\n    MongoDB \u4e2d\u4f7f\u7528\u4e86 find \u548c find_one \u65b9\u6cd5\u6765\u67e5\u8be2\u96c6\u5408\u4e2d\u7684\u6570\u636e\uff0c\u5b83\u7c7b\u4f3c\u4e8e SQL \u4e2d\u7684 SELECT \u8bed\u53e5\u3002\n  <\/div>\n
\u67e5\u8be2\u4e00\u6761\u6570\u636e<\/h3>\n
\n    \u6211\u4eec\u53ef\u4ee5\u4f7f\u7528 find_one() \u65b9\u6cd5\u6765\u67e5\u8be2\u96c6\u5408\u4e2d\u7684\u4e00\u6761\u6570\u636e\u3002\u67e5\u8be2 sites \u6587\u6863\u4e2d\u7684\u7b2c\u4e00\u6761\u6570\u636e\uff1a\n  <\/div>\n
\n
 import <\/span>pymongo
  
 myclient = pymongo.MongoClient<\/span>(\"mongodb:\/\/localhost:27017\/\"<\/span>)
 mydb = myclient[\"testdb\"<\/span>]
 mycol = mydb[\"sites\"<\/span>]
  
 x = mycol.find_one<\/span>()
  
 print(x)
 <\/span><\/code><\/pre>\n<\/p><\/div>\n
\n    \u8fd0\u884c\u7ed3\u679c\uff1a\n  <\/div>\n
\n
{'_id': ObjectId('5f17ddd0b141d312e5c38e07'), 'name': 'Lidihuo', 'url': 'https:\/\/www.lidihuo.com'}<\/span><\/code><\/pre>\n<\/p><\/div>\n
\u67e5\u8be2\u96c6\u5408\u4e2d\u6240\u6709\u6570\u636e<\/h3>\n
\n    find() \u65b9\u6cd5\u53ef\u4ee5\u67e5\u8be2\u96c6\u5408\u4e2d\u7684\u6240\u6709\u6570\u636e\uff0c\u7c7b\u4f3c SQL \u4e2d\u7684 SELECT * \u64cd\u4f5c\u3002\u4ee5\u4e0b\u5b9e\u4f8b\u67e5\u627e sites \u96c6\u5408\u4e2d\u7684\u6240\u6709\u6570\u636e\uff1a\n  <\/div>\n
\n
 import <\/span>pymongo
  
 myclient = pymongo.MongoClient<\/span>(\"mongodb:\/\/localhost:27017\/\"<\/span>)
 mydb = myclient[\"testdb\"<\/span>]
 mycol = mydb[\"sites\"<\/span>]
 for <\/span><\/span>x in <\/span>mycol.find<\/span>():
   print(x)
 <\/span><\/code><\/pre>\n<\/p><\/div>\n
\n    \u8fd0\u884c\u7ed3\u679c\uff1a\n  <\/div>\n
\n
 {'_id': ObjectId('5f17ddd0b141d312e5c38e07'), 'name': 'Lidihuo', 'url': 'https:\/\/www.lidihuo.com'}
 {'_id': ObjectId('5f17ddeaf99e553262c65b88'), 'name': 'Google', 'url': 'https:\/\/www.google.com'}
 {'_id': ObjectId('5f17de561d5e8966224d5734'), 'name': 'Taobao', 'url': 'https:\/\/www.taobao.com'}
 {'_id': ObjectId('5f17de561d5e8966224d5735'), 'name': 'QQ', 'url': 'https:\/\/www.qq.com'}
 {'_id': ObjectId('5f17de561d5e8966224d5736'), 'name': 'Facebook', 'url': 'https:\/\/www.facebook.com'}
 {'_id': ObjectId('5f17de561d5e8966224d5737'), 'name': '\u77e5\u4e4e', 'url': 'https:\/\/www.zhihu.com'}
 {'_id': ObjectId('5f17de561d5e8966224d5738'), 'name': 'Github', 'url': 'https:\/\/www.github.com'} <\/span><\/code><\/pre>\n<\/p><\/div>\n
\u67e5\u8be2\u6307\u5b9a\u5b57\u6bb5\u7684\u6570\u636e<\/h3>\n
\n    \u6211\u4eec\u53ef\u4ee5\u4f7f\u7528 find() \u65b9\u6cd5\u6765\u67e5\u8be2\u6307\u5b9a\u5b57\u6bb5\u7684\u6570\u636e\uff0c\u8981\u67e5\u8be2\u7684\u5b57\u6bb5\u503c\u8bbe\u7f6e\u4e3a 1\u5373\u53ef\u3002\n  <\/div>\n
\n
 import <\/span>pymongo
  
 myclient = pymongo.MongoClient<\/span>(\"mongodb:\/\/localhost:27017\/\"<\/span>)
 mydb = myclient[\"testdb\"<\/span>]
 mycol = mydb[\"sites\"<\/span>]
 for <\/span><\/span>x in <\/span>mycol.find<\/span>({},{ \"_id\"<\/span>: 0, \"name\"<\/span>: 1}):
   print(x)
 <\/span><\/code><\/pre>\n<\/p><\/div>\n
\n    \u8fd0\u884c\u7ed3\u679c\uff1a\n  <\/div>\n
\n
 {'name': 'Lidihuo'}
 {'name': 'Google'}
 {'name': 'Taobao'}
 {'name': 'QQ'}
 {'name': 'Facebook'}
 {'name': '\u77e5\u4e4e'}
 {'name': 'Github'} <\/span><\/code><\/pre>\n<\/p><\/div>\n
\n    \u9664\u4e86 _id \u4f60\u4e0d\u80fd\u5728\u4e00\u4e2a\u5bf9\u8c61\u4e2d\u540c\u65f6\u6307\u5b9a 0 \u548c 1\uff0c\u5982\u679c\u4f60\u8bbe\u7f6e\u4e86\u4e00\u4e2a\u5b57\u6bb5\u4e3a 0\uff0c\u5219\u5176\u4ed6\u90fd\u4e3a 1\uff0c\u53cd\u4e4b\u4ea6\u7136\u3002
\n   
\u4ee5\u4e0b\u5b9e\u4f8b\u9664\u4e86 name \u5b57\u6bb5\u5916\uff0c\u5176\u4ed6\u90fd\u8fd4\u56de\uff1a\n  <\/div>\n
\n
 import <\/span>pymongo
  
 myclient = pymongo.MongoClient<\/span>(\"mongodb:\/\/localhost:27017\/\"<\/span>)
 mydb = myclient[\"testdb\"<\/span>]
 mycol = mydb[\"sites\"<\/span>]
 for <\/span><\/span>x in <\/span>mycol.find<\/span>({},{ \"name\"<\/span>: 0 }):
   print(x)
 <\/span><\/code><\/pre>\n<\/p><\/div>\n
\n    \u8fd0\u884c\u7ed3\u679c\uff1a\n  <\/div>\n
\n
 {'_id': ObjectId('5f17ddd0b141d312e5c38e07'), 'url': 'https:\/\/www.lidihuo.com'}
 {'_id': ObjectId('5f17ddeaf99e553262c65b88'), 'url': 'https:\/\/www.google.com'}
 {'_id': ObjectId('5f17de561d5e8966224d5734'), 'url': 'https:\/\/www.taobao.com'}
 {'_id': ObjectId('5f17de561d5e8966224d5735'), 'url': 'https:\/\/www.qq.com'}
 {'_id': ObjectId('5f17de561d5e8966224d5736'), 'url': 'https:\/\/www.facebook.com'}
 {'_id': ObjectId('5f17de561d5e8966224d5737'), 'url': 'https:\/\/www.zhihu.com'}
 {'_id': ObjectId('5f17de561d5e8966224d5738'), 'url': 'https:\/\/www.github.com'} <\/span><\/code><\/pre>\n<\/p><\/div>\n
\u6839\u636e\u6307\u5b9a\u6761\u4ef6\u67e5\u8be2<\/h3>\n
\n    \u6211\u4eec\u53ef\u4ee5\u5728 find() \u4e2d\u8bbe\u7f6e\u53c2\u6570\u6765\u8fc7\u6ee4\u6570\u636e\u3002
\n   
\u4ee5\u4e0b\u5b9e\u4f8b\u67e5\u627e name \u5b57\u6bb5\u4e3a \"Lidihuo\" \u7684\u6570\u636e\n  <\/div>\n
\n
 import <\/span>pymongo

 myclient = pymongo.MongoClient<\/span>(\"mongodb:\/\/localhost:27017\/\"<\/span>)
 mydb = myclient[\"testdb\"<\/span>]
 mycol = mydb[\"sites\"<\/span>]
 myquery = { \"name\"<\/span>: \"Lidihuo\"<\/span> }
 mydoc = mycol.find<\/span>(myquery)
 for <\/span><\/span>x in <\/span>mydoc:
   print(x)
 <\/span><\/code><\/pre>\n<\/p><\/div>\n
\n    \u8fd0\u884c\u7ed3\u679c\uff1a\n  <\/div>\n
\n
{'_id': ObjectId('5f17ddd0b141d312e5c38e07'), 'name': 'Lidihuo', 'url': 'https:\/\/www.lidihuo.com'}<\/span><\/code><\/pre>\n<\/p><\/div>\n
\u9ad8\u7ea7\u67e5\u8be2<\/h3>\n
\n    \u67e5\u8be2\u7684\u6761\u4ef6\u8bed\u53e5\u4e2d\uff0c\u6211\u4eec\u8fd8\u53ef\u4ee5\u4f7f\u7528\u4fee\u9970\u7b26\u3002
\n   
\u4ee5\u4e0b\u5b9e\u4f8b\u7528\u4e8e\u8bfb\u53d6 name \u5b57\u6bb5\u4e2d\u7b2c\u4e00\u4e2a\u5b57\u6bcd ASCII \u503c\u5927\u4e8e \"H\" \u7684\u6570\u636e\uff0c\u5927\u4e8e\u7684\u4fee\u9970\u7b26\u6761\u4ef6\u4e3a {\"$gt\": \"H\"} :\n  <\/div>\n
\n
 import <\/span>pymongo
  
 myclient = pymongo.MongoClient<\/span>(\"mongodb:\/\/localhost:27017\/\"<\/span>)
 mydb = myclient[\"testdb\"<\/span>]
 mycol = mydb[\"sites\"<\/span>]
 myquery = { \"name\"<\/span>: { \"$gt\"<\/span>: \"L\"<\/span> } }
 mydoc = mycol.find<\/span>(myquery)
  
 for <\/span><\/span>x in <\/span>mydoc:
   print(x)
 <\/span><\/code><\/pre>\n<\/p><\/div>\n
\u4f7f\u7528\u6b63\u5219\u8868\u8fbe\u5f0f\u67e5\u8be2<\/h3>\n
\n    \u6211\u4eec\u8fd8\u53ef\u4ee5\u4f7f\u7528\u6b63\u5219\u8868\u8fbe\u5f0f\u4f5c\u4e3a\u4fee\u9970\u7b26\u3002
\n   
\u6b63\u5219\u8868\u8fbe\u5f0f\u4fee\u9970\u7b26\u53ea\u7528\u4e8e\u641c\u7d22\u5b57\u7b26\u4e32\u7684\u5b57\u6bb5\u3002
\n   
\u4ee5\u4e0b\u5b9e\u4f8b\u7528\u4e8e\u8bfb\u53d6 name \u5b57\u6bb5\u4e2d\u7b2c\u4e00\u4e2a\u5b57\u6bcd\u4e3a \"R\" \u7684\u6570\u636e\uff0c\u6b63\u5219\u8868\u8fbe\u5f0f\u4fee\u9970\u7b26\u6761\u4ef6\u4e3a {\"$regex\": \"^R\"} :\n  <\/div>\n
\n
 import <\/span>pymongo
  
 myclient = pymongo.MongoClient<\/span>(\"mongodb:\/\/localhost:27017\/\"<\/span>)
 mydb = myclient[\"testdb\"<\/span>]
 mycol = mydb[\"sites\"<\/span>]
 myquery = { \"name\"<\/span>: { \"$regex\"<\/span>: \"^L\"<\/span> } }
 mydoc = mycol.find<\/span>(myquery)
 for <\/span><\/span>x in <\/span>mydoc:
   print(x)
 <\/span><\/code><\/pre>\n<\/p><\/div>\n
\n    \u8fd0\u884c\u7ed3\u679c\uff1a\n  <\/div>\n
\n
 {'_id': ObjectId('5f17ddd0b141d312e5c38e07'), 'name': 'Lidihuo', 'url': 'https:\/\/www.lidihuo.com'}
 {'_id': ObjectId('5f17de561d5e8966224d5734'), 'name': 'Taobao', 'url': 'https:\/\/www.taobao.com'}
 {'_id': ObjectId('5f17de561d5e8966224d5735'), 'name': 'QQ', 'url': 'https:\/\/www.qq.com'}
 {'_id': ObjectId('5f17de561d5e8966224d5737'), 'name': '\u77e5\u4e4e', 'url': 'https:\/\/www.zhihu.com'} <\/span><\/code><\/pre>\n<\/p><\/div>\n
\u8fd4\u56de\u6307\u5b9a\u6761\u6570\u8bb0\u5f55<\/h3>\n
\n    \u5982\u679c\u6211\u4eec\u8981\u5bf9\u67e5\u8be2\u7ed3\u679c\u8bbe\u7f6e\u6307\u5b9a\u6761\u6570\u7684\u8bb0\u5f55\u53ef\u4ee5\u4f7f\u7528 limit() \u65b9\u6cd5\uff0c\u8be5\u65b9\u6cd5\u53ea\u63a5\u53d7\u4e00\u4e2a\u6570\u5b57\u53c2\u6570\u3002
\n   
\u4ee5\u4e0b\u5b9e\u4f8b\u8fd4\u56de 3 \u6761\u6587\u6863\u8bb0\u5f55\uff1a\n  <\/div>\n
\n
 import <\/span>pymongo
  
 myclient = pymongo.MongoClient<\/span>(\"mongodb:\/\/localhost:27017\/\"<\/span>)
 mydb = myclient[\"testdb\"<\/span>]
 mycol = mydb[\"sites\"<\/span>]
 myresult = mycol.find<\/span>().limit<\/span>(3)
  
 # \u8f93\u51fa\u7ed3\u679c
<\/span> for <\/span><\/span>x in <\/span>myresult:
   print(x)
 <\/span><\/code><\/pre>\n<\/p><\/div>\n
\n    \u8fd0\u884c\u7ed3\u679c\uff1a\n  <\/div>\n
\n
 {'_id': ObjectId('5f17ddd0b141d312e5c38e07'), 'name': 'Lidihuo', 'url': 'https:\/\/www.lidihuo.com'}
 {'_id': ObjectId('5f17ddeaf99e553262c65b88'), 'name': 'Google', 'url': 'https:\/\/www.google.com'}
 {'_id': ObjectId('5f17de561d5e8966224d5734'), 'name': 'Taobao', 'url': 'https:\/\/www.taobao.com'} <\/span><\/code><\/pre>\n<\/p><\/div>\n
\u4fee\u6539\u6587\u6863<\/h2>\n
\n    \u6211\u4eec\u53ef\u4ee5\u5728 MongoDB \u4e2d\u4f7f\u7528 update_one() \u65b9\u6cd5\u4fee\u6539\u6587\u6863\u4e2d\u7684\u8bb0\u5f55\u3002\u8be5\u65b9\u6cd5\u7b2c\u4e00\u4e2a\u53c2\u6570\u4e3a\u67e5\u8be2\u7684\u6761\u4ef6\uff0c\u7b2c\u4e8c\u4e2a\u53c2\u6570\u4e3a\u8981\u4fee\u6539\u7684\u5b57\u6bb5\u3002
\n   
\u5982\u679c\u67e5\u627e\u5230\u7684\u5339\u914d\u6570\u636e\u591a\u4e8e\u4e00\u6761\uff0c\u5219\u53ea\u4f1a\u4fee\u6539\u7b2c\u4e00\u6761\u3002\u4ee5\u4e0b\u5b9e\u4f8b\u5c06 name \u5b57\u6bb5\u7684\u503c Lidihuo \u6539\u4e3a LDH:\n  <\/div>\n
\n
 import <\/span>pymongo
  
 myclient = pymongo.MongoClient<\/span>(\"mongodb:\/\/localhost:27017\/\"<\/span>)
 mydb = myclient[\"testdb\"<\/span>]
 mycol = mydb[\"sites\"<\/span><\/span>]
  
 myquery = { \"name\"<\/span><\/span>: \"Lidihuo\"<\/span> }
 newvalues = { \"$set\"<\/span>: { \"name\": \"LDH\"<\/span> } }
 mycol.update_one<\/span>(myquery, newvalues)
 # \u8f93\u51fa\u4fee\u6539\u540e\u7684 \"sites\" \u96c6\u5408
<\/span> for <\/span><\/span>x in <\/span>mycol.find<\/span>():
   print(x)
 <\/span><\/code><\/pre>\n<\/p><\/div>\n
\n    \u8fd0\u884c\u7ed3\u679c\uff1a\n  <\/div>\n
\n
 {'_id': ObjectId('5f17ddd0b141d312e5c38e07'), 'name': 'LDH', 'url': 'https:\/\/www.lidihuo.com'}
 {'_id': ObjectId('5f17ddeaf99e553262c65b88'), 'name': 'Google', 'url': 'https:\/\/www.google.com'}
 {'_id': ObjectId('5f17de561d5e8966224d5734'), 'name': 'Taobao', 'url': 'https:\/\/www.taobao.com'}
 {'_id': ObjectId('5f17de561d5e8966224d5735'), 'name': 'QQ', 'url': 'https:\/\/www.qq.com'}
 {'_id': ObjectId('5f17de561d5e8966224d5736'), 'name': 'Facebook', 'url': 'https:\/\/www.facebook.com'}
 {'_id': ObjectId('5f17de561d5e8966224d5737'), 'name': '\u77e5\u4e4e', 'url': 'https:\/\/www.zhihu.com'}
 {'_id': ObjectId('5f17de561d5e8966224d5738'), 'name': 'Github', 'url': 'https:\/\/www.github.com'} <\/span><\/code><\/pre>\n<\/p><\/div>\n
\n    update_one() \u65b9\u6cd5\u53ea\u80fd\u4fee\u5339\u914d\u5230\u7684\u7b2c\u4e00\u6761\u8bb0\u5f55\uff0c\u5982\u679c\u8981\u4fee\u6539\u6240\u6709\u5339\u914d\u5230\u7684\u8bb0\u5f55\uff0c\u53ef\u4ee5\u4f7f\u7528 update_many()\u3002
\n   
\u4ee5\u4e0b\u5b9e\u4f8b\u5c06\u67e5\u627e\u6240\u6709\u4ee5 F \u5f00\u5934\u7684 name \u5b57\u6bb5\uff0c\u5e76\u5c06\u5339\u914d\u5230\u6240\u6709\u8bb0\u5f55\u7684 name \u5b57\u6bb5\u4fee\u6539\u4e3a Lidihuo:\n  <\/div>\n
\n
 import <\/span>pymongo
  
 myclient = pymongo.MongoClient<\/span>(\"mongodb:\/\/localhost:27017\/\"<\/span>)
 mydb = myclient[\"testdb\"<\/span>]
 mycol = mydb[\"sites\"<\/span>]
 myquery = { \"name\"<\/span><\/span>: { \"$regex\"<\/span>: \"^L\"<\/span> } }
 newvalues = { \"$set\"<\/span>: { \"name\": \"Lidihuo\"<\/span> } }
 x = mycol.update_many<\/span>(myquery, newvalues)
 print(x.modified_count, \"\u6587\u6863\u5df2\u4fee\u6539\"<\/span>)
 n class=\"brown\">for <\/span><\/span>x \nin <\/span>mycol. \nfind<\/span>(): \n
   print(x) \n
<\/code><\/pre>\n<\/p><\/div>\n
\n    \u8fd0\u884c\u7ed3\u679c\uff1a\n  <\/div>\n
\n
 1 \u6587\u6863\u5df2\u4fee\u6539
 {'_id': ObjectId('5f17ddd0b141d312e5c38e07'), 'name': 'Lidihuo', 'url': 'https:\/\/www.lidihuo.com'}
 {'_id': ObjectId('5f17ddeaf99e553262c65b88'), 'name': 'Google', 'url': 'https:\/\/www.google.com'}
 {'_id': ObjectId('5f17de561d5e8966224d5734'), 'name': 'Taobao', 'url': 'https:\/\/www.taobao.com'}
 {'_id': ObjectId('5f17de561d5e8966224d5735'), 'name': 'QQ', 'url': 'https:\/\/www.qq.com'}
 {'_id': ObjectId('5f17de561d5e8966224d5736'), 'name': 'Facebook', 'url': 'https:\/\/www.facebook.com'}
 {'_id': ObjectId('5f17de561d5e8966224d5737'), 'name': '\u77e5\u4e4e', 'url': 'https:\/\/www.zhihu.com'}
 {'_id': ObjectId('5f17de561d5e8966224d5738'), 'name': 'Github', 'url': 'https:\/\/www.github.com'} <\/span><\/code><\/pre>\n<\/p><\/div>\n
\u6392\u5e8f<\/h2>\n
\n    sort() \u65b9\u6cd5\u53ef\u4ee5\u6307\u5b9a\u5347\u5e8f\u6216\u964d\u5e8f\u6392\u5e8f\u3002
\n   
sort() \u65b9\u6cd5\u7b2c\u4e00\u4e2a\u53c2\u6570\u4e3a\u8981\u6392\u5e8f\u7684\u5b57\u6bb5\uff0c\u7b2c\u4e8c\u4e2a\u5b57\u6bb5\u6307\u5b9a\u6392\u5e8f\u89c4\u5219\uff0c1 \u4e3a\u5347\u5e8f\uff0c-1 \u4e3a\u964d\u5e8f\uff0c\u9ed8\u8ba4\u4e3a\u5347\u5e8f\u3002\u5bf9\u5b57\u6bb5 name \u6309\u5347\u5e8f\u6392\u5e8f\uff1a\n  <\/div>\n
\n
 import <\/span>pymongo
 myclient = pymongo.MongoClient<\/span>(\"mongodb:\/\/localhost:27017\/\"<\/span>)
 mydb = myclient[\"testdb\"<\/span>]
 mycol = mydb[\"sites\"<\/span>]
 mydoc = mycol.find<\/span>().sort<\/span>(\"name\"<\/span>)
 for <\/span><\/span>x in <\/span>mydoc:
     print(x)
 <\/span><\/code><\/pre>\n<\/p><\/div>\n
\n    \u8fd0\u884c\u7ed3\u679c\uff1a\n  <\/div>\n
\n
 {'_id': ObjectId('5f17de561d5e8966224d5736'), 'name': 'Facebook', 'url': 'https:\/\/www.facebook.com'}
 {'_id': ObjectId('5f17de561d5e8966224d5738'), 'name': 'Github', 'url': 'https:\/\/www.github.com'}
 {'_id': ObjectId('5f17ddeaf99e553262c65b88'), 'name': 'Google', 'url': 'https:\/\/www.google.com'}
 {'_id': ObjectId('5f17ddd0b141d312e5c38e07'), 'name': 'Lidihuo', 'url': 'https:\/\/www.lidihuo.com'}
 {'_id': ObjectId('5f17de561d5e8966224d5735'), 'name': 'QQ', 'url': 'https:\/\/www.qq.com'}
 {'_id': ObjectId('5f17de561d5e8966224d5734'), 'name': 'Taobao', 'url': 'https:\/\/www.taobao.com'}
 {'_id': ObjectId('5f17de561d5e8966224d5737'), 'name': '\u77e5\u4e4e', 'url': 'https:\/\/www.zhihu.com'} <\/span><\/code><\/pre>\n<\/p><\/div>\n
\n    \u5bf9\u5b57\u6bb5 name \u6309\u964d\u5e8f\u6392\u5e8f\uff1a\n  <\/div>\n
\n
 myclient = pymongo.MongoClient<\/span>(\"mongodb:\/\/localhost:27017\/\"<\/span>)
 mydb = myclient[\"testdb\"<\/span>]
 mycol = mydb[\"sites\"<\/span>]
 mydoc = mycol.find<\/span>().sort<\/span>(\"name\"<\/span>, -1)
 for <\/span><\/span>x in <\/span>mydoc:
     print(x)
 <\/span><\/code><\/pre>\n<\/p><\/div>\n
\n    \u8fd0\u884c\u7ed3\u679c\uff1a\n  <\/div>\n
\n
 {'_id': ObjectId('5f17de561d5e8966224d5737'), 'name': '\u77e5\u4e4e', 'url': 'https:\/\/www.zhihu.com'} {'_id': ObjectId('5f17de561d5e8966224d5734'), 'name': 'Taobao', 'url': 'https:\/\/www.taobao.com'} {'_id': ObjectId('5f17de561d5e8966224d5735'), 'name': 'QQ', 'url': 'https:\/\/www.qq.com'} {'_id': ObjectId('5f17ddd0b141d312e5c38e07'), 'name': 'Lidihuo', 'url': 'https:\/\/www.lidihuo.com'} {'_id': ObjectId('5f17ddeaf99e553262c65b88'), 'name': 'Google', 'url': 'https:\/\/www.google.com'} {'_id': ObjectId('5f17de561d5e8966224d5738'), 'name': 'Github', 'url': 'https:\/\/www.github.com'} {'_id': ObjectId('5f17de561d5e8966224d5736'), 'name': 'Facebook', 'url': 'https:\/\/www.facebook.com'} <\/span><\/code><\/pre>\n<\/p><\/div>\n
\u5220\u9664\u6570\u636e<\/h2>\n
\n    \u6211\u4eec\u53ef\u4ee5\u4f7f\u7528 delete_one() \u65b9\u6cd5\u6765\u5220\u9664\u4e00\u4e2a\u6587\u6863\uff0c\u8be5\u65b9\u6cd5\u7b2c\u4e00\u4e2a\u53c2\u6570\u4e3a\u67e5\u8be2\u5bf9\u8c61\uff0c\u6307\u5b9a\u8981\u5220\u9664\u54ea\u4e9b\u6570\u636e\u3002\n  <\/div>\n
\n
 myclient = pymongo.MongoClient<\/span>(\"mongodb:\/\/localhost:27017\/\"<\/span>)
 mydb = myclient[\"testdb\"<\/span>]
 mycol = mydb[\"sites\"<\/span>]
 myquery = { \"name\"<\/span>: \"Taobao\"<\/span> }
 mycol.delete_one<\/span>(myquery)
 # \u5220\u9664\u540e\u8f93\u51fa
<\/span> for <\/span><\/span>x in <\/span>mycol.find<\/span>():
     print(x)
 <\/span><\/code><\/pre>\n<\/p><\/div>\n
\n    \u8fd0\u884c\u7ed3\u679c\uff1a\n  <\/div>\n
\n
 {'_id': ObjectId('5f17ddd0b141d312e5c38e07'), 'name': 'Lidihuo', 'url': 'https:\/\/www.lidihuo.com'}
 {'_id': ObjectId('5f17ddeaf99e553262c65b88'), 'name': 'Google', 'url': 'https:\/\/www.google.com'}
 {'_id': ObjectId('5f17de561d5e8966224d5735'), 'name': 'QQ', 'url': 'https:\/\/www.qq.com'}
 {'_id': ObjectId('5f17de561d5e8966224d5736'), 'name': 'Facebook', 'url': 'https:\/\/www.facebook.com'}
 {'_id': ObjectId('5f17de561d5e8966224d5737'), 'name': '\u77e5\u4e4e', 'url': 'https:\/\/www.zhihu.com'}
 {'_id': ObjectId('5f17de561d5e8966224d5738'), 'name': 'Github', 'url': 'https:\/\/www.github.com'} <\/span><\/code><\/pre>\n<\/p><\/div>\n
\u5220\u9664\u591a\u4e2a\u6587\u6863<\/h2>\n
\n    \u6211\u4eec\u53ef\u4ee5\u4f7f\u7528 delete_many() \u65b9\u6cd5\u6765\u5220\u9664\u591a\u4e2a\u6587\u6863\uff0c\u8be5\u65b9\u6cd5\u7b2c\u4e00\u4e2a\u53c2\u6570\u4e3a\u67e5\u8be2\u5bf9\u8c61\uff0c\u6307\u5b9a\u8981\u5220\u9664\u54ea\u4e9b\u6570\u636e\u3002
\n   
\u5220\u9664\u6240\u6709 name \u5b57\u6bb5\u4e2d\u4ee5 F \u5f00\u5934\u7684\u6587\u6863:\n  <\/div>\n
\n
 import <\/span>pymongo
 myclient = pymongo.MongoClient<\/span>(\"mongodb:\/\/localhost:27017\/\"<\/span>)
 mydb = myclient[\"testdb\"<\/span>]
 mycol = mydb[\"sites\"<\/span>]
 myquery = { \"name\"<\/span>: {\"$regex\"<\/span>: \"^F\"<\/span>} }
 x = mycol.delete_many<\/span>(myquery)
 print(x.deleted_count, \"\u4e2a\u6587\u6863\u5df2\u5220\u9664\"<\/span>)
 <\/span><\/code><\/pre>\n<\/p><\/div>\n
\n    \u8fd0\u884c\u7ed3\u679c\uff1a\n  <\/div>\n
\n
 1 \u4e2a\u6587\u6863\u5df2\u5220\u9664 <\/span><\/code><\/pre>\n<\/p><\/div>\n
\u5220\u9664\u96c6\u5408\u4e2d\u7684\u6240\u6709\u6587\u6863<\/h3>\n
\n    delete_many() \u65b9\u6cd5\u5982\u679c\u4f20\u5165\u7684\u662f\u4e00\u4e2a\u7a7a\u7684\u67e5\u8be2\u5bf9\u8c61\uff0c\u5219\u4f1a\u5220\u9664\u96c6\u5408\u4e2d\u7684\u6240\u6709\u6587\u6863\uff1a\n  <\/div>\n
\n
 import <\/span>pymongo
 myclient = pymongo.MongoClient<\/span>(\"mongodb:\/\/localhost:27017\/\"<\/span>)
 mydb = myclient[\"testdb\"<\/span>]
 mycol = mydb[\"sites\"<\/span>]
 x = mycol.delete_many<\/span>({})
 print(x.deleted_count, \"\u4e2a\u6587\u6863\u5df2\u5220\u9664\"<\/span>)
 <\/span><\/code><\/pre>\n<\/p><\/div>\n
\n    \u8fd0\u884c\u7ed3\u679c\uff1a\n  <\/div>\n
\n
 5 \u4e2a\u6587\u6863\u5df2\u5220\u9664 <\/span><\/code><\/pre>\n<\/p><\/div>\n
\u5220\u9664\u96c6\u5408<\/h3>\n
\n    \u6211\u4eec\u53ef\u4ee5\u4f7f\u7528 drop() \u65b9\u6cd5\u6765\u5220\u9664\u4e00\u4e2a\u96c6\u5408\u3002
\n   
\u4ee5\u4e0b\u5b9e\u4f8b\u5220\u9664\u4e86 customers \u96c6\u5408\uff1a\n  <\/div>\n
\n
 import <\/span>pymongo
  
 myclient = pymongo.MongoClient<\/span>(\"mongodb:\/\/localhost:27017\/\"<\/span>)
 mydb = myclient[\"testdb\"<\/span>]
 mycol = mydb[\"sites\"<\/span>]
  
 mycol.drop<\/span>()
 <\/span><\/code><\/pre>\n<\/p><\/div>\n
\n    \u5982\u679c\u5220\u9664\u6210\u529f drop() \u8fd4\u56de true\uff0c\u5982\u679c\u5220\u9664\u5931\u8d25(\u96c6\u5408\u4e0d\u5b58\u5728)\u5219\u8fd4\u56de false\u3002\n  <\/div>\n
 <\/body>
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