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Flask-SQLAlchemy select date is equal to today's data
ORM Model Tokens has a field that is the creation time, as follows:
create_time = db.Column(db.DateTime, nullable=False, default=datetime.now)
Screenshot in the database:
stackoverflowcast:
db.cast(t.create_time, db.DATE)print:
alone prin...
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How does the Python database orm framework SQLAlchemy exclude specified fields and not map / serialize specified fields when mapping fields?
as shown in the figure below, does SQLAlchemy have a simple way to directly declare that the specified field is not mapped serialized?
for example, does java s Hibernate framework have such a function?
(although there are other "indirect " solut...
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Flask-sqlalchemy 's session problem?
according to the book, this error will be reported all the time, which probably means that this error can only be used in the same thread, right? Do you want to use creat_scoped_session? please give me some advice. Thank you!
sqlalchemy.exc.Programm...
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How to get objects from model.User queried by Flask_SQLAlchemy
the result of the query is a model.user type, not a simple dict, so how can you use it like an object?
user = User.query.filter(User.username == username, User.password == password).first()
...
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Consult the simplified implementation of the same operation of multiple Model classes in Python
now there is a problem in the project. The project is completed in flask. Now there are several data tables with the same order field, and all need to query the data of these tables and adjust the value of the order field.
the inefficient way is to im...
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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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Failure to obtain data often occurs during sqlalchemy operation, but there is data in mysql.
recently, it often appears when using sqlalchemy+python+gunicorn to develop a small project. Sqlalchemy reads the data and returns None, but it is possible to view the data in the database. As a novice, I suspect that there is something wrong with my wr...
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How to encapsulate complex query objects into json data in flask?
the results queried with sqlalchemy contain other entity class objects and are stored in the sqlalchemy-related container. How to convert to json? ...
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How to get the column with index set in a table by flask sqlalchemy
suppose there is a table A whose fields are roughly as follows:
< table >
< thead > < tr >
< th > column < th >
< th > index < th >
< tr > < thead >
< tbody >
< tr >
< td > id < td >
< td > True < td >
< tr >
< tr >
< td > name < td >
<...
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On the structure of Import Table of aiomysql and sqlalchemy
import asyncio
import sqlalchemy as sa
from aiomysql.sa import create_engine
@asyncio.coroutine
def go():
engine = yield from create_engine(user= root ,db= test ,host= 127.0.0.1 ,password= root )
metadata = sa.MetaData(bind=engine)
...
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How does flask SQLAlchemy limit the scope of fields to make queries?
I recently learned Flask s SQLAlchemy,. Suppose I have such a map information table. Map has fields a, b is shaping. I want to query the data of an and b in a specific range, such as result_query = Map.query.filter (1 ...
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Python flask sqlalchemy multi-field query, dynamically change the query statement
suddenly there is an idea that if the field changes are complicated when making a query, you can t write the query statement, just like A.query.filter (name== ds ) is written dead. If I need to dynamically switch query fields, especially when there ...
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Python slqalchemy
A model has data A1 B model has data b1
b1.key1 is a foreign key, associated with the primary key of a1.id
is there a problem for me to delete A1 data directly now? db.session.delete (A1) db.session.commit ()
...
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Case insensitivity of like query in MySQL5.7
for example, I like % R% answer, the query results include not only R, but also r, which is not what I want, I want to be case-sensitive. I guess it has something to do with the proofreading rules of the table. My table uses utf8mb4 encoding, and the pr...
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Sqlalchemy view
ask a question about sqlalchemy. Does ORM have no concept of view (VIEW)? Create a virtual table that is not really saved in the database, in which the fields are obtained from multiple tables and the tables are associated with each other through foreign...
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How to use sqlalchemy to connect to a pymysql database with two tables, extract the data and page it?
these are the data of my two tables:
flask:
sqlalchemy:
:
...
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How to do exclude query by python sqlalchemy
The database is mysql, checked the document and found no exclude, only an except_. if my table is called table_a, and has a status field, if it is a single field, you can use! = to exclude, what should I say if it is a scope? For example, if you have ...
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How to implement thread-safe INSERT IF NOT EXIST? gracefully by sqlalchemy
Database table mytable structure id id_card INT VARCHAR (32) where id is the self-increasing primary key
how to gracefully implement if id_card insertion when it does not exist, of course, thread-safe can not be repeated. my implementation is to a...
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How do you separate the model using the Flask-SQLAlchemy project structure?
see examples that define the model directly at the start of the program, such as _ _ init__.py, server.py. my idea is to define the model in the corresponding .py file and create it directly when needed. I don t know how to organize the project file a...
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Sqlalchemy query data, sort according to the data in the field (Chinese) to Pinyin (ascending order)
1.sqlalchemy query data, sort according to the data in the field (Chinese) to Pinyin (ascending order) 2. It is known that there are func.convert and sql.func.CONVERT methods in sqlalchemy, and the import method is .
from sqlalchemy import func
from sq...
