吴裕雄--天生自然 PYTHON3开发学习:MongoDB
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import pymongo myclient = pymongo.MongoClient("mongodb://localhost:27017/") mydb = myclient["runoobdb"]
import pymongo myclient = pymongo.MongoClient('mongodb://localhost:27017/') dblist = myclient.list_database_names() # dblist = myclient.database_names() if "runoobdb" in dblist: print("数据库已存在!")
import pymongo myclient = pymongo.MongoClient("mongodb://localhost:27017/") mydb = myclient["runoobdb"] mycol = mydb["sites"]
import pymongo myclient = pymongo.MongoClient('mongodb://localhost:27017/') mydb = myclient['runoobdb'] collist = mydb. list_collection_names() # collist = mydb.collection_names() if "sites" in collist: # 判断 sites 集合是否存在 print("集合已存在!")
import pymongo myclient = pymongo.MongoClient("mongodb://localhost:27017/") mydb = myclient["runoobdb"] mycol = mydb["sites"] mydict = { "name": "RUNOOB", "alexa": "10000", "url": "https://www.runoob.com" } x = mycol.insert_one(mydict) print(x) print(x)
import pymongo myclient = pymongo.MongoClient("mongodb://localhost:27017/") mydb = myclient["runoobdb"] mycol = mydb["sites"] x = mycol.find_one() print(x)
import pymongo myclient = pymongo.MongoClient("mongodb://localhost:27017/") mydb = myclient["runoobdb"] mycol = mydb["sites"] for x in mycol.find(): print(x)
import pymongo myclient = pymongo.MongoClient("mongodb://localhost:27017/") mydb = myclient["runoobdb"] mycol = mydb["sites"] myquery = { "alexa": "10000" } newvalues = { "$set": { "alexa": "12345" } } mycol.update_one(myquery, newvalues) # 输出修改后的 "sites" 集合 for x in mycol.find(): print(x)
import pymongo myclient = pymongo.MongoClient("mongodb://localhost:27017/") mydb = myclient["runoobdb"] mycol = mydb["sites"] myquery = { "name": { "$regex": "^F" } } newvalues = { "$set": { "alexa": "123" } } x = mycol.update_many(myquery, newvalues) print(x.modified_count, "文档已修改")
import pymongo myclient = pymongo.MongoClient("mongodb://localhost:27017/") mydb = myclient["runoobdb"] mycol = mydb["sites"] mydoc = mycol.find().sort("alexa") for x in mydoc: print(x)
import pymongo myclient = pymongo.MongoClient("mongodb://localhost:27017/") mydb = myclient["runoobdb"] mycol = mydb["sites"] mydoc = mycol.find().sort("alexa", -1) for x in mydoc: print(x)
import pymongo myclient = pymongo.MongoClient("mongodb://localhost:27017/") mydb = myclient["runoobdb"] mycol = mydb["sites"] myquery = { "name": "Taobao" } mycol.delete_one(myquery) # 删除后输出 for x in mycol.find(): print(x)
import pymongo myclient = pymongo.MongoClient("mongodb://localhost:27017/") mydb = myclient["runoobdb"] mycol = mydb["sites"] myquery = { "name": {"$regex": "^F"} } x = mycol.delete_many(myquery) print(x.deleted_count, "个文档已删除")
import pymongo myclient = pymongo.MongoClient("mongodb://localhost:27017/") mydb = myclient["runoobdb"] mycol = mydb["sites"] x = mycol.delete_many({}) print(x.deleted_count, "个文档已删除")
import pymongo myclient = pymongo.MongoClient("mongodb://localhost:27017/") mydb = myclient["runoobdb"] mycol = mydb["sites"] mycol.drop()
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