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Not able to insert DateTime into sqlite

See original GitHub issue

I run sandman2ctl sqlite+pysqlite:///storage.db with an sqlite database.

The following error occurs if I try to insert '2019-02-17T21:48:07.539Z' into a column with the type datetime:

[2019-02-17 22:48:27,888] ERROR in app: Exception on /t_purchase/ [POST]
Traceback (most recent call last):
  File "c:\users\lorenz\appdata\local\programs\python\python36\lib\site-packages\sqlalchemy\engine\base.py", line 1127, in _execute_context
    context = constructor(dialect, self, conn, *args)
  File "c:\users\lorenz\appdata\local\programs\python\python36\lib\site-packages\sqlalchemy\engine\default.py", line 669, in _init_compiled
    param.append(processors[key](compiled_params[key]))
  File "c:\users\lorenz\appdata\local\programs\python\python36\lib\site-packages\sqlalchemy\dialects\sqlite\base.py", line 610, in process
    raise TypeError("SQLite DateTime type only accepts Python "
TypeError: SQLite DateTime type only accepts Python datetime and date objects as input.

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "c:\users\lorenz\appdata\local\programs\python\python36\lib\site-packages\flask\app.py", line 2292, in wsgi_app
    response = self.full_dispatch_request()
  File "c:\users\lorenz\appdata\local\programs\python\python36\lib\site-packages\flask\app.py", line 1815, in full_dispatch_request
    rv = self.handle_user_exception(e)
  File "c:\users\lorenz\appdata\local\programs\python\python36\lib\site-packages\flask\app.py", line 1718, in handle_user_exception
    reraise(exc_type, exc_value, tb)
  File "c:\users\lorenz\appdata\local\programs\python\python36\lib\site-packages\flask\_compat.py", line 35, in reraise
    raise value
  File "c:\users\lorenz\appdata\local\programs\python\python36\lib\site-packages\flask\app.py", line 1813, in full_dispatch_request
    rv = self.dispatch_request()
  File "c:\users\lorenz\appdata\local\programs\python\python36\lib\site-packages\flask\app.py", line 1799, in dispatch_request
    return self.view_functions[rule.endpoint](**req.view_args)
  File "c:\users\lorenz\appdata\local\programs\python\python36\lib\site-packages\flask\views.py", line 88, in view
    return self.dispatch_request(*args, **kwargs)
  File "c:\users\lorenz\appdata\local\programs\python\python36\lib\site-packages\flask\views.py", line 158, in dispatch_request
    return meth(*args, **kwargs)
  File "c:\users\lorenz\appdata\local\programs\python\python36\lib\site-packages\sandman2\decorators.py", line 72, in decorated
    return func(instance, *args, **kwargs)
  File "c:\users\lorenz\appdata\local\programs\python\python36\lib\site-packages\sandman2\service.py", line 152, in post
    db.session().commit()
  File "c:\users\lorenz\appdata\local\programs\python\python36\lib\site-packages\sqlalchemy\orm\session.py", line 954, in commit
    self.transaction.commit()
  File "c:\users\lorenz\appdata\local\programs\python\python36\lib\site-packages\sqlalchemy\orm\session.py", line 467, in commit
    self._prepare_impl()
  File "c:\users\lorenz\appdata\local\programs\python\python36\lib\site-packages\sqlalchemy\orm\session.py", line 447, in _prepare_impl
    self.session.flush()
  File "c:\users\lorenz\appdata\local\programs\python\python36\lib\site-packages\sqlalchemy\orm\session.py", line 2313, in flush
    self._flush(objects)
  File "c:\users\lorenz\appdata\local\programs\python\python36\lib\site-packages\sqlalchemy\orm\session.py", line 2440, in _flush
    transaction.rollback(_capture_exception=True)
  File "c:\users\lorenz\appdata\local\programs\python\python36\lib\site-packages\sqlalchemy\util\langhelpers.py", line 66, in __exit__
    compat.reraise(exc_type, exc_value, exc_tb)
  File "c:\users\lorenz\appdata\local\programs\python\python36\lib\site-packages\sqlalchemy\util\compat.py", line 249, in reraise
    raise value
  File "c:\users\lorenz\appdata\local\programs\python\python36\lib\site-packages\sqlalchemy\orm\session.py", line 2404, in _flush
    flush_context.execute()
  File "c:\users\lorenz\appdata\local\programs\python\python36\lib\site-packages\sqlalchemy\orm\unitofwork.py", line 395, in execute
    rec.execute(self)
  File "c:\users\lorenz\appdata\local\programs\python\python36\lib\site-packages\sqlalchemy\orm\unitofwork.py", line 560, in execute
    uow
  File "c:\users\lorenz\appdata\local\programs\python\python36\lib\site-packages\sqlalchemy\orm\persistence.py", line 181, in save_obj
    mapper, table, insert)
  File "c:\users\lorenz\appdata\local\programs\python\python36\lib\site-packages\sqlalchemy\orm\persistence.py", line 872, in _emit_insert_statements
    execute(statement, params)
  File "c:\users\lorenz\appdata\local\programs\python\python36\lib\site-packages\sqlalchemy\engine\base.py", line 948, in execute
    return meth(self, multiparams, params)
  File "c:\users\lorenz\appdata\local\programs\python\python36\lib\site-packages\sqlalchemy\sql\elements.py", line 269, in _execute_on_connection
    return connection._execute_clauseelement(self, multiparams, params)
  File "c:\users\lorenz\appdata\local\programs\python\python36\lib\site-packages\sqlalchemy\engine\base.py", line 1060, in _execute_clauseelement
    compiled_sql, distilled_params
  File "c:\users\lorenz\appdata\local\programs\python\python36\lib\site-packages\sqlalchemy\engine\base.py", line 1132, in _execute_context
    None, None)
  File "c:\users\lorenz\appdata\local\programs\python\python36\lib\site-packages\sqlalchemy\engine\base.py", line 1413, in _handle_dbapi_exception
    exc_info
  File "c:\users\lorenz\appdata\local\programs\python\python36\lib\site-packages\sqlalchemy\util\compat.py", line 265, in raise_from_cause
    reraise(type(exception), exception, tb=exc_tb, cause=cause)
  File "c:\users\lorenz\appdata\local\programs\python\python36\lib\site-packages\sqlalchemy\util\compat.py", line 248, in reraise
    raise value.with_traceback(tb)
  File "c:\users\lorenz\appdata\local\programs\python\python36\lib\site-packages\sqlalchemy\engine\base.py", line 1127, in _execute_context
    context = constructor(dialect, self, conn, *args)
  File "c:\users\lorenz\appdata\local\programs\python\python36\lib\site-packages\sqlalchemy\engine\default.py", line 669, in _init_compiled
    param.append(processors[key](compiled_params[key]))
  File "c:\users\lorenz\appdata\local\programs\python\python36\lib\site-packages\sqlalchemy\dialects\sqlite\base.py", line 610, in process
    raise TypeError("SQLite DateTime type only accepts Python "
sqlalchemy.exc.StatementError: (builtins.TypeError) SQLite DateTime type only accepts Python datetime and date objects as input. [SQL: 'INSERT INTO t_purchase (date) VALUES (?)'] [parameters: [{'date': '2019-02-17T21:48:07.539Z'}]]
127.0.0.1 - - [17/Feb/2019 22:48:27] "POST /t_purchase/ HTTP/1.1" 500 -

Issue Analytics

State:
Created 5 years ago
Comments:5

Top GitHub Comments

5reactions

LorenzHenkcommented, Mar 14, 2019

If anyone else has this problem as well, I’ve found the solution: You need to create a custom type and cast the string to a datetime object yourself.

class MyDateTime(db.TypeDecorator):
    impl = db.DateTime
    
    def process_bind_param(self, value, dialect):
        if type(value) is str:
            return datetime.datetime.strptime(value, '%Y-%m-%dT%H:%M:%S')
        return value

0reactions

mturktest123commented, Jun 25, 2020

with python 3.6.9 I had to make a couple updates.

def datetime_sqlalchemy(value): return datetime.datetime.strptime(value, ‘%Y-%m-%d %H:%M:%S.%f’)

and

datetime_created=datetime_sqlalchemy(str(datetime.datetime.now()))

and sqlalchemy is set up this way:

class Article(Base): tablename = ‘article’ datetime_created = Column(DateTime) datetime_end = Column(DateTime)

Let me know if I’m doing this incorrectly ;but thought I’d leave an update on what worked for me.

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