{"id":4457,"date":"2019-06-02T13:38:03","date_gmt":"2019-06-02T05:38:03","guid":{"rendered":"https:\/\/ixyzero.com\/blog\/?p=4457"},"modified":"2019-06-02T13:38:03","modified_gmt":"2019-06-02T05:38:03","slug":"mongodb%e7%9a%84%e7%ae%80%e5%8d%95%e6%93%8d%e4%bd%9c%e8%ae%b0%e5%bd%95","status":"publish","type":"post","link":"https:\/\/ixyzero.com\/blog\/archives\/4457.html","title":{"rendered":"MongoDB\u7684\u7b80\u5355\u64cd\u4f5c\u8bb0\u5f55"},"content":{"rendered":"\n

=Start=<\/p>\n\n\n\n

\u7f18\u7531\uff1a<\/h4>\n\n\n\n

MongoDB\u5728\u6211\u7684\u65e5\u5e38\u5de5\u4f5c\u548c\u9879\u76ee\u4e2d\u7528\u7684\u6bd4\u8f83\u5c11\uff0c\u64cd\u4f5c\u4e0d\u600e\u4e48\u719f\u7ec3\uff0c\u5728\u8fd9\u91cc\u7b80\u5355\u8bb0\u5f55\u5b66\u4e60\u4e00\u4e0bMongoDB\u4e2d\u7684\u5e38\u89c1\u64cd\u4f5c\uff0c\u65b9\u4fbf\u8981\u7528\u7684\u65f6\u5019\u8fdb\u884c\u53c2\u8003\u3002<\/p>\n\n\n\n

\u6b63\u6587\uff1a<\/h4>\n\n\n\n

\u53c2\u8003\u89e3\u7b54\uff1a<\/h5>\n\n\n\n
# \u547d\u4ee4\u884c\u64cd\u4f5c<\/h6>\n\n\n\n
# \u67e5\u8be2MongoDB\u4e2d\u90fd\u6709\u54ea\u4e9b\u6570\u636e\u5e93
> show dbs

# \u67e5\u770b\u5f53\u524d\u4f7f\u7528\u7684\u662f\u54ea\u4e2a\u6570\u636e\u5e93
> db

# \u9009\u4e2d\u5e76\u5207\u6362\u81f3\u67d0\u4e2a\u6570\u636e\u5e93 test1
> use test1

# \u67e5\u770b\u6570\u636e\u5e93 test1 \u4e2d\u90fd\u6709\u54ea\u4e9b\u96c6\u5408
> show collections

# \u67e5\u770b\u6570\u636e\u5e93 test1 \u7684\u96c6\u5408 posts \u4e2d\u90fd\u6709\u54ea\u4e9b\u5143\u7d20
> db.posts.find()

# \u67e5\u770b\u6570\u636e\u5e93 test1 \u7684\u96c6\u5408 posts \u4e2d\u90fd\u6709\u54ea\u4e9b\u5143\u7d20\uff08\u53ea\u6311\u9009\u524d 2 \u4e2a\u5143\u7d20\uff09
> db.posts.find().limit(2)

# \u5411\u6570\u636e\u5e93 test1 \u7684\u96c6\u5408 users \u63d2\u5165\u5143\u7d20
> db.users.insert({name: 'paulo'})
> db.users.insert({name: 'pedro'})

# \u6a21\u7cca\u67e5\u8be2
> db.users.find({name: \/a\/})  \/\/like '%a%'
> db.users.find({name: \/^pa\/}) \/\/like 'pa%' 
> db.users.find({name: \/ro$\/}) \/\/like '%ro'

# \u66f4\u65b0\u64cd\u4f5c
> db.users.update({'name':'pedro'},{$set:{'name':'New Update pedro'}})

# \u67e5\u8be2\u66f4\u65b0\u540e\u7684\u7ed3\u679c
> db.users.find()

# \u5220\u9664\u64cd\u4f5c
> db.users.insert({name: 'ppp'})
> db.users.remove({name: 'ppp'})

> db.users.find()

> db.users.remove()
# \u62a5\u9519\uff1a E QUERY    [thread1] Error: remove needs a query

# \u5220\u9664\u6307\u5b9a collection \u4e2d\u7684\u6240\u6709\u5143\u7d20
> db.users.remove({})<\/pre>\n\n\n\n
&<\/p>\n\n\n\n
# \u67e5\u8be2collection foo \u4e2d\u4ee5 _id \u5b57\u6bb5\u8fdb\u884c\u6392\u5e8f\u7684\u524d 50 \u6761\u8bb0\u5f55
db.foo.find().sort({_id:1}).limit(50)

# \u67e5\u8be2collection foo \u4e2d\u8fdb\u884c\u300c\u81ea\u7136\u6392\u5e8f\u300d\u7684\u524d 50 \u6761\u8bb0\u5f55
db.foo.find().sort({$natural:1}).limit(50)<\/pre>\n\n\n\n
&<\/p>\n\n\n\n
\/\/ \u67e5\u8be2 name \u6570\u7ec4\u5b57\u6bb5\u662f\u5426\u6709\u4e0b\u6807\u4e3a 1 \u7684\u5143\u7d20\uff08\u5982\u679c\u6709\u5219\u8bf4\u660e\u81f3\u5c11\u67092\u4e2a\u5143\u7d20\uff09
db.accommodations.find({'name.1': {$exists: true}})

\/\/ \u4f7f\u7528 $where
db.accommodations.find( {$where: \"this.name.length > 1\"} )

\/\/ \u63d0\u524d\u521b\u5efa\u4e00\u4e2a\u989d\u5916\u7684\u5b57\u6bb5 NamesArrayLength \u7528\u4e8e\u5b58\u653e\u7279\u5b9a\u6570\u7ec4\u7684\u5927\u5c0f\uff0c\u65b9\u4fbf\u540e\u9762\u4f7f\u7528\uff0c\u901f\u5ea6\u66f4\u5feb\u66f4\u597d
db.accommodations.find({\"NamesArrayLength\": {$gt: 1} })<\/pre>\n\n\n\n
# Python\u64cd\u4f5c<\/h6>\n\n\n\n
from pymongo import MongoClient
client = MongoClient('mongodb:\/\/localhost:27017\/')

# db = client['test_db']
db = client.test_db

# collection = db['posts']
collection = db.posts

import pprint
import datetime

post = {\"author\": \"Mike\",
         \"text\": \"My first blog post!\",
         \"tags\": [\"mongodb\", \"python\", \"pymongo\"],
         \"date\": datetime.datetime.utcnow()}

post_id = collection.insert_one(post).inserted_id
print(\"post id is \", post_id)

cur_collection = db.collection_names(include_system_collections=False)
print(\"cur_collection is :\", cur_collection)

pprint.pprint(collection.find_one())

print(\"Find By Post Author:\")
post = collection.find_one({\"author\": \"Mike\"})
pprint.pprint(post)

print(\"Find By Post ID:\")
post = collection.find_one({\"_id\": post_id})
pprint.pprint(post)

# Web\u5e94\u7528\u7a0b\u5e8f\u4e2d\u7684\u5e38\u89c1\u4efb\u52a1\u662f\u4ece\u8bf7\u6c42URL\u83b7\u53d6ObjectId\u5e76\u627e\u5230\u5339\u914d\u7684\u6587\u6863\u3002
# \u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b\uff0c\u5fc5\u987b\u5c06ObjectId\u4ece\u4e00\u4e2a\u5b57\u7b26\u4e32\u8f6c\u6362\u5230\u7b26\u5408\u6761\u4ef6\u7684\u7c7b\u578b\u624d\u884c\u3002
from bson.objectid import ObjectId
# The web framework gets post_id from the URL and passes it as a string
def get_post(post_id):
    # Convert from string to ObjectId:
    document = client.db.collection.find_one({'_id': ObjectId(post_id)})


# \u6279\u91cf\u63d2\u5165
new_posts = [{\"_id\": 1000,
               \"author\": \"Curry\",
               \"text\": \"Another post!\",
               \"tags\": [\"bulk\", \"insert\"],
               \"date\": datetime.datetime(2018, 5, 12, 11, 14)},
              {\"_id\": 1001,
               \"author\": \"Mike\",
               \"title\": \"MongoDB is fun\",
               \"text\": \"and pretty easy too!\",
               \"date\": datetime.datetime(2019, 5, 30, 10, 45)}
            ]

# collection = db.posts
result = collection.insert_many(new_posts)
print(\"Bulk Inserts Result is :\", result.inserted_ids)


# \u6279\u91cf\u67e5\u8be2
# collection = db.posts
for post in collection.find():
    pprint.pprint(post)

for post in collection.find({\"author\": \"Mike\"}):
    pprint.pprint(post)


print(\"posts count is = \", collection.count())

print(\"posts's author is Mike count is =\", collection.find({\"author\": \"Mike\"}).count())

d = datetime.datetime(2019, 5, 31, 12)
for post in collection.find({\"date\": {\"$lt\": d}}).sort(\"author\"):
    pprint.pprint(post)<\/pre>\n\n\n\n
\u53c2\u8003\u94fe\u63a5\uff1a<\/h5>\n\n\n\n