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Modification of database by sqlalchemy
engine = create_engine ( "mysql+pymysql: root:111@localhost xxx ", encoding= utf-8 , echo=True) Session_class = sessionmaker (bind=engine) Session = Session_class ()
modify a record user = Session.query (User). Filter_by (id=1). First () user.n...
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How to solve the problem that the string numbers are saved in the database and all of them are killed from the front to the zero?
some data are like this: 1186486, 0215648, 00064876, mysql stores data to columns of char type, data is stored in front of 0, all columns are killed. How to solve
the short ones are preceded by 0, and the data is a string in python and does not ki...
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Python connected to mysql successfully. After executing the insert command, there is no value in the table in mysql.
first of all, I created a database, called dd in mysal, and then I created a table, called books in it, and then I executed the following command in python, hoping to insert a value in books:
< hr >
import pymysql conn=pymysql.connect (host= "127....
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Pymysql inserts a numeric string into the database and does not report an error and does not successfully ask for help.
insert but the data is a number, which is stored in the database as a string, and the corresponding field in the database is also of string type
The python statement goes like this:
sql = insert into uhaoma343 (riqi,uhaoma) values({},{}) .format(r...
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Python3.6 installation MySQL-python-1.2.5 error
python: 3.6 mysql: 8.0
Boss, how to solve
...
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How to connect jmeter or python to mysql? on the springboard
at present, the company s mysql database cannot be connected directly locally and needs to be connected through a springboard (windows server). The steps to manipulate the data each time are:
connect the springboard machine (windows server,ip: 10.*...
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Mysql insert field error
I put
keywordpackagename:
in this table.
...
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How to solve the error report in mysql
z how to solve this problem ...
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I would like to ask you how a given address can be divided into separate administrative divisions of provinces, cities and regions. I have been thinking about it all day without any ideas.
ask for help from seniors: if the long address is xxxx, Nanjing Road, Heping District, Tianjin
how can it be dealt with by means of no manual intervention: Tianjin; Heping District; Nanjing Road; this kind of administrative division?
because the inp...
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Error in pycharm connection mysql database execution file under OS environment
python version is 3.5, MySQL version is 5.7.21, create database: py4e create table: PymySqlTest,
install pymysql
pip3 install pymysql
prompt
Requirement already satisfied: pymysql in Library Frameworks Python.framework Versions 3.7 lib python3.7...
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There is a problem with writing txt documents to MySQL database with python.
the contents of the txt document are as follows:
- supplementary question. The code is improved as follows, but still encounter problems:
import mysql.connector
conn = mysql.connector.connect(host= localhost , port=3306, user= root , password= ...
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During rabbit asynchronous processing, mysql read an unfinished data and reported an error.
Application scenario: the client uploads the file and the django server writes a piece of status=1 data in the database. Then give it to rabbit to read the file and parse it. After parsing, set status to 2. The transmission format of rabbitmq is { "f...
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Clustering of Python- large-scale trajectory data
recently, I have been working on track data clustering. Now I have track data of about 2 million people on hand. Each person s track consists of a sequence of points (a point position every half hour), as shown in the table .
A day is divided int...
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Why does pymysql update the database with a total prompt of 1054?
sql = "UPDATE arms SET gem2= %s WHERE id = ( %d )" % ( ,new_id)
(1054, "Unknown column gem2 in field list ")
sql = "UPDATE arms SET gem2= WHERE id = ( %d )" % new_id
(1054, &quo...
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Python reports an error when storing picture binaries in mysql
with open( face.jpg , rb ) as f:
img_data=f.read()
find_binary=pymysql.Binary(img_data)
print(find_binary)
add_row="""INSERT INTO IMGS(ID,IMG,,DATAIMG) VALUES(7, K1 , NO. , %s )""" % (find_binary)
cursor.execut...
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Python redis is used for caching. Redis hset fails when data is entered into mysql.
problem description
when I use python3 s redis for caching, the structure is hset, but when the data reaches 10000, I need to store these 10000 pieces of data into the database. When I delete the hset, of redis, the new request is not added to the re...
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Optimization of mysql in the case of continuous concurrent writes
Business scenario
7pm 24-hour continuous data writing and updating (market system), it is necessary to store the transaction record and update the k line after calculating the k line according to the transaction record
current solution
use Celery ...
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Python3 pymysql has been confused.
import pymysql
import time
import datetime
-sharp
db = pymysql.connect("localhost","root","aaaaaa","getlist" )
cursor = db.cursor()
sql="INSERT INTO t_mall VALUES (0,%s,%s,%s)"
try:
-sharp SQL
curs...
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How to set up a foreign key foreignkey in sqlalchemy can be associated with your own table, such as comment related reply, comment and reply all belong to Comment
problem description
the environmental background of the problems and what methods you have tried
related codes
Please paste the code text below (do not replace the code with pictures) class Comment (Model):
"""
comment and re...
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Python crawl data is written to mysql error pymysql.err.ProgrammingError: Cursor closed
for loop write crawl to crawl data, and then write mysql, to look at the database, the write is successful, but reported an error, may I ask why?
...
