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SQLAlchemy - Convert sqlalchemy.sql.functions.now() to Unix epoch (with fraction)
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2
I'm using Doubles to track time in my database (as Unix timestamps with fractional portions). For that, I've created the following user type (that takes pytz-aware datetimes from the application and converts them to UTC timestamps).
from sqlalchemy.types import TypeDecorator, Float
class DoubleDatetime(TypeDecorator):
impl = Float
def __init__(self):
TypeDecorator.__init__(self, as_decimal=False)
def process_bind_param(self, value, dialect):
return value.timestamp()
def process_result_value(self, value, dialect):
return datetime.datetime.utcfromtimestamp(value)
This works fine for all datetimes in my system. I'm using the following column definition to have the database (in my case, SQLite3) insert the transaction time:
from sqlalchemy import Column
from sqlalchemy.sql.functions import now
column = Column("transaction_begin", DoubleDatetime, server_default=now())
Despite defining the transaction_begin column as a DoubleDatetime, my database still stores the records with a string.
How can I force the server transaction timestamp to use fractional Unix epochs?
What have I tried?
Reading the SQLite3 docs, I know I need to do some Julian Day trickery to do this.
SELECT (julianday('now') - 2440587.5) * 86400.0;
But I can't find julianday in sqlalchemy.sql.functions, to wrap it in a zero-argument lambda (to pass as the server_default arg to Column).
I tried the following, but it doesn't seem to work.
from sqlalchemy import text
server_default = text("SELECT (julianday('now') - 2440587.5) * 86400.0;")
Nor does the following:
from sqlalchemy.sql import select, text
server_default = select([text("(julianday('now') - 2440587.5) * 86400.0;")])
Traceback:
Traceback (most recent call last):
File "/home/randm/Libraries/anaconda3/lib/python3.7/site-packages/sqlalchemy/engine/base.py", line 1193, in _execute_context
context)
File "/home/randm/Libraries/anaconda3/lib/python3.7/site-packages/sqlalchemy/engine/default.py", line 509, in do_execute
cursor.execute(statement, parameters)
sqlite3.OperationalError: near "SELECT": syntax error
The above exception was the direct cause of the following exception:
Traceback (most recent call last):
File "tasks.py", line 81, in <module>
metadata.create_all(engine)
File "/home/randm/Libraries/anaconda3/lib/python3.7/site-packages/sqlalchemy/sql/schema.py", line 4005, in create_all
tables=tables)
File "/home/randm/Libraries/anaconda3/lib/python3.7/site-packages/sqlalchemy/engine/base.py", line 1940, in _run_visitor
conn._run_visitor(visitorcallable, element, **kwargs)
File "/home/randm/Libraries/anaconda3/lib/python3.7/site-packages/sqlalchemy/engine/base.py", line 1549, in _run_visitor
**kwargs).traverse_single(element)
File "/home/randm/Libraries/anaconda3/lib/python3.7/site-packages/sqlalchemy/sql/visitors.py", line 121, in traverse_single
return meth(obj, **kw)
File "/home/randm/Libraries/anaconda3/lib/python3.7/site-packages/sqlalchemy/sql/ddl.py", line 757, in visit_metadata
_is_metadata_operation=True)
File "/home/randm/Libraries/anaconda3/lib/python3.7/site-packages/sqlalchemy/sql/visitors.py", line 121, in traverse_single
return meth(obj, **kw)
File "/home/randm/Libraries/anaconda3/lib/python3.7/site-packages/sqlalchemy/sql/ddl.py", line 791, in visit_table
include_foreign_key_constraints=include_foreign_key_constraints
File "/home/randm/Libraries/anaconda3/lib/python3.7/site-packages/sqlalchemy/engine/base.py", line 948, in execute
return meth(self, multiparams, params)
File "/home/randm/Libraries/anaconda3/lib/python3.7/site-packages/sqlalchemy/sql/ddl.py", line 68, in _execute_on_connection
return connection._execute_ddl(self, multiparams, params)
File "/home/randm/Libraries/anaconda3/lib/python3.7/site-packages/sqlalchemy/engine/base.py", line 1009, in _execute_ddl
compiled
File "/home/randm/Libraries/anaconda3/lib/python3.7/site-packages/sqlalchemy/engine/base.py", line 1200, in _execute_context
context)
File "/home/randm/Libraries/anaconda3/lib/python3.7/site-packages/sqlalchemy/engine/base.py", line 1413, in _handle_dbapi_exception
exc_info
File "/home/randm/Libraries/anaconda3/lib/python3.7/site-packages/sqlalchemy/util/compat.py", line 265, in raise_from_cause
reraise(type(exception), exception, tb=exc_tb, cause=cause)
File "/home/randm/Libraries/anaconda3/lib/python3.7/site-packages/sqlalchemy/util/compat.py", line 248, in reraise
raise value.with_traceback(tb)
File "/home/randm/Libraries/anaconda3/lib/python3.7/site-packages/sqlalchemy/engine/base.py", line 1193, in _execute_context
context)
File "/home/randm/Libraries/anaconda3/lib/python3.7/site-packages/sqlalchemy/engine/default.py", line 509, in do_execute
cursor.execute(statement, parameters)
sqlalchemy.exc.OperationalError: (sqlite3.OperationalError) near "SELECT": syntax error [SQL: "nCREATE TABLE barchartbarmessage (ntsymbol VARCHAR NOT NULL, ntdate DATE NOT NULL, ntopen NUMERIC, nthigh NUMERIC, ntlow NUMERIC, ntclose NUMERIC, ntvolume INTEGER, ntprevious_day_open_interest INTEGER, ntprevious_day_volume INTEGER, ntmessage_time FLOAT, nttransaction_begin FLOAT DEFAULT SELECT (julianday('now') - 2440587.5) * 86400.0; NOT NULL, nttransaction_end FLOAT, ntPRIMARY KEY (symbol, date, transaction_begin)n)nn"] (Background on this error at: http://sqlalche.me/e/e3q8)
python sqlalchemy
asked Jan 3 at 16:52
MikeRandMikeRand
2,17333253
add a comment |
2
I'm using Doubles to track time in my database (as Unix timestamps with fractional portions). For that, I've created the following user type (that takes pytz-aware datetimes from the application and converts them to UTC timestamps).
from sqlalchemy.types import TypeDecorator, Float
class DoubleDatetime(TypeDecorator):
impl = Float
def __init__(self):
TypeDecorator.__init__(self, as_decimal=False)
def process_bind_param(self, value, dialect):
return value.timestamp()
def process_result_value(self, value, dialect):
return datetime.datetime.utcfromtimestamp(value)
This works fine for all datetimes in my system. I'm using the following column definition to have the database (in my case, SQLite3) insert the transaction time:
from sqlalchemy import Column
from sqlalchemy.sql.functions import now
column = Column("transaction_begin", DoubleDatetime, server_default=now())
Despite defining the transaction_begin column as a DoubleDatetime, my database still stores the records with a string.
How can I force the server transaction timestamp to use fractional Unix epochs?
What have I tried?
Reading the SQLite3 docs, I know I need to do some Julian Day trickery to do this.
SELECT (julianday('now') - 2440587.5) * 86400.0;
But I can't find julianday in sqlalchemy.sql.functions, to wrap it in a zero-argument lambda (to pass as the server_default arg to Column).
I tried the following, but it doesn't seem to work.
from sqlalchemy import text
server_default = text("SELECT (julianday('now') - 2440587.5) * 86400.0;")
Nor does the following:
from sqlalchemy.sql import select, text
server_default = select([text("(julianday('now') - 2440587.5) * 86400.0;")])
Traceback:
Traceback (most recent call last):
File "/home/randm/Libraries/anaconda3/lib/python3.7/site-packages/sqlalchemy/engine/base.py", line 1193, in _execute_context
context)
File "/home/randm/Libraries/anaconda3/lib/python3.7/site-packages/sqlalchemy/engine/default.py", line 509, in do_execute
cursor.execute(statement, parameters)
sqlite3.OperationalError: near "SELECT": syntax error
The above exception was the direct cause of the following exception:
Traceback (most recent call last):
File "tasks.py", line 81, in <module>
metadata.create_all(engine)
File "/home/randm/Libraries/anaconda3/lib/python3.7/site-packages/sqlalchemy/sql/schema.py", line 4005, in create_all
tables=tables)
File "/home/randm/Libraries/anaconda3/lib/python3.7/site-packages/sqlalchemy/engine/base.py", line 1940, in _run_visitor
conn._run_visitor(visitorcallable, element, **kwargs)
File "/home/randm/Libraries/anaconda3/lib/python3.7/site-packages/sqlalchemy/engine/base.py", line 1549, in _run_visitor
**kwargs).traverse_single(element)
File "/home/randm/Libraries/anaconda3/lib/python3.7/site-packages/sqlalchemy/sql/visitors.py", line 121, in traverse_single
return meth(obj, **kw)
File "/home/randm/Libraries/anaconda3/lib/python3.7/site-packages/sqlalchemy/sql/ddl.py", line 757, in visit_metadata
_is_metadata_operation=True)
File "/home/randm/Libraries/anaconda3/lib/python3.7/site-packages/sqlalchemy/sql/visitors.py", line 121, in traverse_single
return meth(obj, **kw)
File "/home/randm/Libraries/anaconda3/lib/python3.7/site-packages/sqlalchemy/sql/ddl.py", line 791, in visit_table
include_foreign_key_constraints=include_foreign_key_constraints
File "/home/randm/Libraries/anaconda3/lib/python3.7/site-packages/sqlalchemy/engine/base.py", line 948, in execute
return meth(self, multiparams, params)
File "/home/randm/Libraries/anaconda3/lib/python3.7/site-packages/sqlalchemy/sql/ddl.py", line 68, in _execute_on_connection
return connection._execute_ddl(self, multiparams, params)
File "/home/randm/Libraries/anaconda3/lib/python3.7/site-packages/sqlalchemy/engine/base.py", line 1009, in _execute_ddl
compiled
File "/home/randm/Libraries/anaconda3/lib/python3.7/site-packages/sqlalchemy/engine/base.py", line 1200, in _execute_context
context)
File "/home/randm/Libraries/anaconda3/lib/python3.7/site-packages/sqlalchemy/engine/base.py", line 1413, in _handle_dbapi_exception
exc_info
File "/home/randm/Libraries/anaconda3/lib/python3.7/site-packages/sqlalchemy/util/compat.py", line 265, in raise_from_cause
reraise(type(exception), exception, tb=exc_tb, cause=cause)
File "/home/randm/Libraries/anaconda3/lib/python3.7/site-packages/sqlalchemy/util/compat.py", line 248, in reraise
raise value.with_traceback(tb)
File "/home/randm/Libraries/anaconda3/lib/python3.7/site-packages/sqlalchemy/engine/base.py", line 1193, in _execute_context
context)
File "/home/randm/Libraries/anaconda3/lib/python3.7/site-packages/sqlalchemy/engine/default.py", line 509, in do_execute
cursor.execute(statement, parameters)
sqlalchemy.exc.OperationalError: (sqlite3.OperationalError) near "SELECT": syntax error [SQL: "nCREATE TABLE barchartbarmessage (ntsymbol VARCHAR NOT NULL, ntdate DATE NOT NULL, ntopen NUMERIC, nthigh NUMERIC, ntlow NUMERIC, ntclose NUMERIC, ntvolume INTEGER, ntprevious_day_open_interest INTEGER, ntprevious_day_volume INTEGER, ntmessage_time FLOAT, nttransaction_begin FLOAT DEFAULT SELECT (julianday('now') - 2440587.5) * 86400.0; NOT NULL, nttransaction_end FLOAT, ntPRIMARY KEY (symbol, date, transaction_begin)n)nn"] (Background on this error at: http://sqlalche.me/e/e3q8)
python sqlalchemy
asked Jan 3 at 16:52
MikeRandMikeRand
2,17333253
add a comment |
2
2
2
I'm using Doubles to track time in my database (as Unix timestamps with fractional portions). For that, I've created the following user type (that takes pytz-aware datetimes from the application and converts them to UTC timestamps).
from sqlalchemy.types import TypeDecorator, Float
class DoubleDatetime(TypeDecorator):
impl = Float
def __init__(self):
TypeDecorator.__init__(self, as_decimal=False)
def process_bind_param(self, value, dialect):
return value.timestamp()
def process_result_value(self, value, dialect):
return datetime.datetime.utcfromtimestamp(value)
This works fine for all datetimes in my system. I'm using the following column definition to have the database (in my case, SQLite3) insert the transaction time:
from sqlalchemy import Column
from sqlalchemy.sql.functions import now
column = Column("transaction_begin", DoubleDatetime, server_default=now())
Despite defining the transaction_begin column as a DoubleDatetime, my database still stores the records with a string.
How can I force the server transaction timestamp to use fractional Unix epochs?
What have I tried?
Reading the SQLite3 docs, I know I need to do some Julian Day trickery to do this.
SELECT (julianday('now') - 2440587.5) * 86400.0;
But I can't find julianday in sqlalchemy.sql.functions, to wrap it in a zero-argument lambda (to pass as the server_default arg to Column).
I tried the following, but it doesn't seem to work.
from sqlalchemy import text
server_default = text("SELECT (julianday('now') - 2440587.5) * 86400.0;")
Nor does the following:
from sqlalchemy.sql import select, text
server_default = select([text("(julianday('now') - 2440587.5) * 86400.0;")])
Traceback:
Traceback (most recent call last):
File "/home/randm/Libraries/anaconda3/lib/python3.7/site-packages/sqlalchemy/engine/base.py", line 1193, in _execute_context
context)
File "/home/randm/Libraries/anaconda3/lib/python3.7/site-packages/sqlalchemy/engine/default.py", line 509, in do_execute
cursor.execute(statement, parameters)
sqlite3.OperationalError: near "SELECT": syntax error
The above exception was the direct cause of the following exception:
Traceback (most recent call last):
File "tasks.py", line 81, in <module>
metadata.create_all(engine)
File "/home/randm/Libraries/anaconda3/lib/python3.7/site-packages/sqlalchemy/sql/schema.py", line 4005, in create_all
tables=tables)
File "/home/randm/Libraries/anaconda3/lib/python3.7/site-packages/sqlalchemy/engine/base.py", line 1940, in _run_visitor
conn._run_visitor(visitorcallable, element, **kwargs)
File "/home/randm/Libraries/anaconda3/lib/python3.7/site-packages/sqlalchemy/engine/base.py", line 1549, in _run_visitor
**kwargs).traverse_single(element)
File "/home/randm/Libraries/anaconda3/lib/python3.7/site-packages/sqlalchemy/sql/visitors.py", line 121, in traverse_single
return meth(obj, **kw)
File "/home/randm/Libraries/anaconda3/lib/python3.7/site-packages/sqlalchemy/sql/ddl.py", line 757, in visit_metadata
_is_metadata_operation=True)
File "/home/randm/Libraries/anaconda3/lib/python3.7/site-packages/sqlalchemy/sql/visitors.py", line 121, in traverse_single
return meth(obj, **kw)
File "/home/randm/Libraries/anaconda3/lib/python3.7/site-packages/sqlalchemy/sql/ddl.py", line 791, in visit_table
include_foreign_key_constraints=include_foreign_key_constraints
File "/home/randm/Libraries/anaconda3/lib/python3.7/site-packages/sqlalchemy/engine/base.py", line 948, in execute
return meth(self, multiparams, params)
File "/home/randm/Libraries/anaconda3/lib/python3.7/site-packages/sqlalchemy/sql/ddl.py", line 68, in _execute_on_connection
return connection._execute_ddl(self, multiparams, params)
File "/home/randm/Libraries/anaconda3/lib/python3.7/site-packages/sqlalchemy/engine/base.py", line 1009, in _execute_ddl
compiled
File "/home/randm/Libraries/anaconda3/lib/python3.7/site-packages/sqlalchemy/engine/base.py", line 1200, in _execute_context
context)
File "/home/randm/Libraries/anaconda3/lib/python3.7/site-packages/sqlalchemy/engine/base.py", line 1413, in _handle_dbapi_exception
exc_info
File "/home/randm/Libraries/anaconda3/lib/python3.7/site-packages/sqlalchemy/util/compat.py", line 265, in raise_from_cause
reraise(type(exception), exception, tb=exc_tb, cause=cause)
File "/home/randm/Libraries/anaconda3/lib/python3.7/site-packages/sqlalchemy/util/compat.py", line 248, in reraise
raise value.with_traceback(tb)
File "/home/randm/Libraries/anaconda3/lib/python3.7/site-packages/sqlalchemy/engine/base.py", line 1193, in _execute_context
context)
File "/home/randm/Libraries/anaconda3/lib/python3.7/site-packages/sqlalchemy/engine/default.py", line 509, in do_execute
cursor.execute(statement, parameters)
sqlalchemy.exc.OperationalError: (sqlite3.OperationalError) near "SELECT": syntax error [SQL: "nCREATE TABLE barchartbarmessage (ntsymbol VARCHAR NOT NULL, ntdate DATE NOT NULL, ntopen NUMERIC, nthigh NUMERIC, ntlow NUMERIC, ntclose NUMERIC, ntvolume INTEGER, ntprevious_day_open_interest INTEGER, ntprevious_day_volume INTEGER, ntmessage_time FLOAT, nttransaction_begin FLOAT DEFAULT SELECT (julianday('now') - 2440587.5) * 86400.0; NOT NULL, nttransaction_end FLOAT, ntPRIMARY KEY (symbol, date, transaction_begin)n)nn"] (Background on this error at: http://sqlalche.me/e/e3q8)
python sqlalchemy
asked Jan 3 at 16:52
MikeRandMikeRand
2,17333253
I'm using Doubles to track time in my database (as Unix timestamps with fractional portions). For that, I've created the following user type (that takes pytz-aware datetimes from the application and converts them to UTC timestamps).
from sqlalchemy.types import TypeDecorator, Float
class DoubleDatetime(TypeDecorator):
impl = Float
def __init__(self):
TypeDecorator.__init__(self, as_decimal=False)
def process_bind_param(self, value, dialect):
return value.timestamp()
def process_result_value(self, value, dialect):
return datetime.datetime.utcfromtimestamp(value)
This works fine for all datetimes in my system. I'm using the following column definition to have the database (in my case, SQLite3) insert the transaction time:
from sqlalchemy import Column
from sqlalchemy.sql.functions import now
column = Column("transaction_begin", DoubleDatetime, server_default=now())
Despite defining the transaction_begin column as a DoubleDatetime, my database still stores the records with a string.
How can I force the server transaction timestamp to use fractional Unix epochs?
What have I tried?
Reading the SQLite3 docs, I know I need to do some Julian Day trickery to do this.
SELECT (julianday('now') - 2440587.5) * 86400.0;
But I can't find julianday in sqlalchemy.sql.functions, to wrap it in a zero-argument lambda (to pass as the server_default arg to Column).
I tried the following, but it doesn't seem to work.
from sqlalchemy import text
server_default = text("SELECT (julianday('now') - 2440587.5) * 86400.0;")
Nor does the following:
from sqlalchemy.sql import select, text
server_default = select([text("(julianday('now') - 2440587.5) * 86400.0;")])
Traceback:
Traceback (most recent call last):
File "/home/randm/Libraries/anaconda3/lib/python3.7/site-packages/sqlalchemy/engine/base.py", line 1193, in _execute_context
context)
File "/home/randm/Libraries/anaconda3/lib/python3.7/site-packages/sqlalchemy/engine/default.py", line 509, in do_execute
cursor.execute(statement, parameters)
sqlite3.OperationalError: near "SELECT": syntax error
The above exception was the direct cause of the following exception:
Traceback (most recent call last):
File "tasks.py", line 81, in <module>
metadata.create_all(engine)
File "/home/randm/Libraries/anaconda3/lib/python3.7/site-packages/sqlalchemy/sql/schema.py", line 4005, in create_all
tables=tables)
File "/home/randm/Libraries/anaconda3/lib/python3.7/site-packages/sqlalchemy/engine/base.py", line 1940, in _run_visitor
conn._run_visitor(visitorcallable, element, **kwargs)
File "/home/randm/Libraries/anaconda3/lib/python3.7/site-packages/sqlalchemy/engine/base.py", line 1549, in _run_visitor
**kwargs).traverse_single(element)
File "/home/randm/Libraries/anaconda3/lib/python3.7/site-packages/sqlalchemy/sql/visitors.py", line 121, in traverse_single
return meth(obj, **kw)
File "/home/randm/Libraries/anaconda3/lib/python3.7/site-packages/sqlalchemy/sql/ddl.py", line 757, in visit_metadata
_is_metadata_operation=True)
File "/home/randm/Libraries/anaconda3/lib/python3.7/site-packages/sqlalchemy/sql/visitors.py", line 121, in traverse_single
return meth(obj, **kw)
File "/home/randm/Libraries/anaconda3/lib/python3.7/site-packages/sqlalchemy/sql/ddl.py", line 791, in visit_table
include_foreign_key_constraints=include_foreign_key_constraints
File "/home/randm/Libraries/anaconda3/lib/python3.7/site-packages/sqlalchemy/engine/base.py", line 948, in execute
return meth(self, multiparams, params)
File "/home/randm/Libraries/anaconda3/lib/python3.7/site-packages/sqlalchemy/sql/ddl.py", line 68, in _execute_on_connection
return connection._execute_ddl(self, multiparams, params)
File "/home/randm/Libraries/anaconda3/lib/python3.7/site-packages/sqlalchemy/engine/base.py", line 1009, in _execute_ddl
compiled
File "/home/randm/Libraries/anaconda3/lib/python3.7/site-packages/sqlalchemy/engine/base.py", line 1200, in _execute_context
context)
File "/home/randm/Libraries/anaconda3/lib/python3.7/site-packages/sqlalchemy/engine/base.py", line 1413, in _handle_dbapi_exception
exc_info
File "/home/randm/Libraries/anaconda3/lib/python3.7/site-packages/sqlalchemy/util/compat.py", line 265, in raise_from_cause
reraise(type(exception), exception, tb=exc_tb, cause=cause)
File "/home/randm/Libraries/anaconda3/lib/python3.7/site-packages/sqlalchemy/util/compat.py", line 248, in reraise
raise value.with_traceback(tb)
File "/home/randm/Libraries/anaconda3/lib/python3.7/site-packages/sqlalchemy/engine/base.py", line 1193, in _execute_context
context)
File "/home/randm/Libraries/anaconda3/lib/python3.7/site-packages/sqlalchemy/engine/default.py", line 509, in do_execute
cursor.execute(statement, parameters)
sqlalchemy.exc.OperationalError: (sqlite3.OperationalError) near "SELECT": syntax error [SQL: "nCREATE TABLE barchartbarmessage (ntsymbol VARCHAR NOT NULL, ntdate DATE NOT NULL, ntopen NUMERIC, nthigh NUMERIC, ntlow NUMERIC, ntclose NUMERIC, ntvolume INTEGER, ntprevious_day_open_interest INTEGER, ntprevious_day_volume INTEGER, ntmessage_time FLOAT, nttransaction_begin FLOAT DEFAULT SELECT (julianday('now') - 2440587.5) * 86400.0; NOT NULL, nttransaction_end FLOAT, ntPRIMARY KEY (symbol, date, transaction_begin)n)nn"] (Background on this error at: http://sqlalche.me/e/e3q8)
python sqlalchemy
python sqlalchemy
asked Jan 3 at 16:52
MikeRandMikeRand
2,17333253
asked Jan 3 at 16:52
MikeRandMikeRand
2,17333253
edited Jan 3 at 18:35
MikeRand
asked Jan 3 at 16:52
MikeRandMikeRand
2,17333253
asked Jan 3 at 16:52
MikeRandMikeRand
2,17333253
asked Jan 3 at 16:52
MikeRandMikeRand
2,17333253
2,17333253
add a comment |
add a comment |
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