Simple use of mongodb database

MongoDB Use of database

Adding data to the database ：

Database insertion

​ db. Collection name .insert({})–> Insert a
​ db. Collection name .insert([{},{},…])–> Insert multiple
​ db. Collection name .insertOne({})–> Insert a
​ db. Collection name .insertMany([{},{},…])–> Insert multiple
​ // notes : Every document in the database has a unique id Property value , You can specify it yourself, but make sure it's unique

Search operation of database :

​ db. Collection name .find()–> Find all documents in the database collection
​ db. Collection name .findOne({})–> Find the first document that meets the criteria
​ db. Collection name .find()

Database update operation ：

​ db. Collection name .update({},{})// Accept two objects , The first object represents the object being searched , The second object represents the data to be updated , however update By default, the second object will replace the old object , If you want to modify a property , You need to use a conditional operator
​ update() By default, only the first qualified document will be modified , If you want to modify more than one parameter, add a third parameter multi:true
​ db. Collection name .updateMany()– Modify multiple documents
​ db. Collection name .updateOne()– Modify a document

Database delete operation :

​ db. Collection name .deleteOne({})– Delete the first document that meets the criteria
​ db. Collection name .deleteMany({})– Delete multiple documents that meet the conditions
​ db. Collection name .remove({})– Delete eligible documents , By default, multiple
Delete database ：db.dropDatebase()
Delete the collection :db. Collection name .drop()

Conditional operators :

​ $gt Greater than $lt Less than $gte Greater than or equal to $lte Less than or equal to eq be equal to $or:[{},{},…] Choose a relationship
​ limit()- Set the upper limit of data display , Used for paging
​ skip()- Used to skip the specified amount of data

stay Python Chinese vs mongodb Conduct operation code

Import related packages

import pymongo
from pymongo import MongoClient

Create databases and tables

# MongDB Connect to database 
conn = MongoClient('localhost', 27017)
db = conn['history']
col = db['log']

insert data （ When the data is a dictionary, the following code may be required for format conversion ）

from bson import json_util
data1=json.loads(json_util.dumps(data))  
col.insert_one(data1)

Find data

record = col.find(sort=[("_id", pymongo.DESCENDING)])
records = []
for r in record:
    records.append(r)
    print(r)

Output results ：

record It is a collection of many dictionaries

Pass the dictionary through the list

Use table style to display in the background

 <section class="counts section-bg">
     <div class="container">
<table class="table table-striped table-hover table-condensed table-bordered ">
   <tr class="info">
       <th> Content </th>
       <th> title </th>
   </tr>
     {% for record in records %}
   <tr class="success">
       <td>{
   {record['name']}}</td>
       <td>{
   {record['content']}}</td>
   </tr>
    {% endfor %}
       </table>

     </div>
   </section><!-- End Counts Section -->