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how to get column handle from key in sqlalchemy


how to get column handle from key in sqlalchemy

By : Naidu Pinakana
Date : November 21 2020, 12:01 PM
this will help If agep is an attribute on stmt.c, you can get the value by using getattr(stmt.c, "agep").
code :


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How should I handle decimal in SQLalchemy & SQLite

How should I handle decimal in SQLalchemy & SQLite


By : Michal Vlček
Date : March 29 2020, 07:55 AM
hop of those help? SQLalchemy give me the following warning when I use a Numeric column with an SQLite database engine.
code :
from decimal import Decimal as D
import sqlalchemy.types as types

class SqliteNumeric(types.TypeDecorator):
    impl = types.String
    def load_dialect_impl(self, dialect):
        return dialect.type_descriptor(types.VARCHAR(100))
    def process_bind_param(self, value, dialect):
        return str(value)
    def process_result_value(self, value, dialect):
        return D(value)

# can overwrite the imported type name
# @note: the TypeDecorator does not guarantie the scale and precision.
# you can do this with separate checks
Numeric = SqliteNumeric
class T(Base):
    __tablename__ = 't'
    id = Column(Integer, primary_key=True, nullable=False, unique=True)
    value = Column(Numeric(12, 2), nullable=False)
    #value = Column(SqliteNumeric(12, 2), nullable=False)

    def __init__(self, value):
        self.value = value
Column update not being commited in sqlalchemy (sqlalchemy-utils)

Column update not being commited in sqlalchemy (sqlalchemy-utils)


By : user2997986
Date : March 29 2020, 07:55 AM
this one helps. The problem was with the PasswordType in SQLAlchemy-utils.
It works when I make a call to force_auto_coercion.
SQLALCHEMY/PANDAS - SQLAlchemy reading column as CLOB for Pandas to_sql

SQLALCHEMY/PANDAS - SQLAlchemy reading column as CLOB for Pandas to_sql


By : user3405973
Date : March 29 2020, 07:55 AM
I think the issue was by ths following , You can specify the SQL type to use for a certain column with the dtype keyword argument (see docs):
code :
from sqlalchemy.types import String
inv.to_sql('inventory', db2, dtype={'col_name': String})
cols = df.dtypes[df.dtypes=='object'].index
type_mapping = {col : String for col in cols }
inv.to_sql('inventory', db2, dtype=type_mapping)
How to handle SQLAlchemy Connections in ProcessPool?

How to handle SQLAlchemy Connections in ProcessPool?


By : Suren Duhan
Date : March 29 2020, 07:55 AM
may help you . Your requirement of one database connection per process-pool process can be easily satisfied if some care is taken on how you instantiate the session, assuming you are working with the orm, in the worker processes.
A simple solution would be to have a global session which you reuse across requests:
code :
# db.py
engine = create_engine("connection_uri", pool_size=1, max_overflow=0)
DBSession = scoped_session(sessionmaker(bind=engine)) 
# task.py
from db import engine, DBSession
def task():
    DBSession.begin() # each task will get its own transaction over the global connection
    ...
    DBSession.query(...)
    ...
    DBSession.close() # cleanup on task end
python - Handle column names in form for update query with Flask-SQLAlchemy

python - Handle column names in form for update query with Flask-SQLAlchemy


By : Simon Lebettre
Date : March 29 2020, 07:55 AM
I hope this helps you . I would suggest you query your database first and pass the row id as the value for your select in html
In your flask app
code :
@app.route('/exhibition', methods=['GET', 'POST'])
def exhibition():
    options = session.query(Exhibition) #however you query your db
    return render_template('exhibition.html', options = options)
<select>
{%for option in options%}
  <option value={{option.id}}>{{option.text}}</option>
{endfor}
</select>
row_to_edit = session.query(Exhibition).filter_by(id = request.form ['input_field']))
#specify what you are updating
row_to_edit.column_to_update = request.form ['input_field']
# Then you can comit column_to_edit
@app.route('/exhibition', methods=['GET', 'POST'])
    def exhibition():
        options = session.query(Exhibition) #however you query your db
        cols = Exhibition.__table__.columns
        return render_template('exhibition.html', options = options, cols = cols)
<select>
{%for col in cols%}
  <option value={{col.key}}>{{col.key}}</option>
{endfor}
</select>
row_to_edit.getattr(row_to_edit, request.form ['select_field_for_column'] = request.form ['input_field_column_value']
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