Source code for pydal.adapters.informix
# -*- coding: utf-8 -*-
import datetime
import re
from .._globals import IDENTITY
from .base import BaseAdapter
[docs]class InformixAdapter(BaseAdapter):
drivers = ('informixdb',)
types = {
'boolean': 'CHAR(1)',
'string': 'VARCHAR(%(length)s)',
'text': 'BLOB SUB_TYPE 1',
'json': 'BLOB SUB_TYPE 1',
'password': 'VARCHAR(%(length)s)',
'blob': 'BLOB SUB_TYPE 0',
'upload': 'VARCHAR(%(length)s)',
'integer': 'INTEGER',
'bigint': 'BIGINT',
'float': 'FLOAT',
'double': 'DOUBLE PRECISION',
'decimal': 'NUMERIC(%(precision)s,%(scale)s)',
'date': 'DATE',
'time': 'CHAR(8)',
'datetime': 'DATETIME',
'id': 'SERIAL',
'reference': 'INTEGER REFERENCES %(foreign_key)s ON DELETE %(on_delete_action)s',
'list:integer': 'BLOB SUB_TYPE 1',
'list:string': 'BLOB SUB_TYPE 1',
'list:reference': 'BLOB SUB_TYPE 1',
'big-id': 'BIGSERIAL',
'big-reference': 'BIGINT REFERENCES %(foreign_key)s ON DELETE %(on_delete_action)s',
'reference FK': 'REFERENCES %(foreign_key)s ON DELETE %(on_delete_action)s CONSTRAINT FK_%(table_name)s_%(field_name)s',
'reference TFK': 'FOREIGN KEY (%(field_name)s) REFERENCES %(foreign_table)s (%(foreign_key)s) ON DELETE %(on_delete_action)s CONSTRAINT TFK_%(table_name)s_%(field_name)s',
}
[docs] def NOT_NULL(self,default,field_type):
return 'DEFAULT %s NOT NULL' % self.represent(default,field_type)
[docs] def select_limitby(self, sql_s, sql_f, sql_t, sql_w, sql_o, limitby):
if limitby:
(lmin, lmax) = limitby
fetch_amt = lmax - lmin
dbms_version = int(self.connection.dbms_version.split('.')[0])
if lmin and (dbms_version >= 10):
# Requires Informix 10.0+
sql_s += ' SKIP %d' % (lmin, )
if fetch_amt and (dbms_version >= 9):
# Requires Informix 9.0+
sql_s += ' FIRST %d' % (fetch_amt, )
return 'SELECT %s %s FROM %s%s%s;' % (sql_s, sql_f, sql_t, sql_w, sql_o)
[docs] def represent_exceptions(self, obj, fieldtype):
if fieldtype == 'date':
if isinstance(obj, (datetime.date, datetime.datetime)):
obj = obj.isoformat()[:10]
else:
obj = str(obj)
return "to_date('%s','%%Y-%%m-%%d')" % obj
elif fieldtype == 'datetime':
if isinstance(obj, datetime.datetime):
obj = obj.isoformat()[:19].replace('T',' ')
elif isinstance(obj, datetime.date):
obj = obj.isoformat()[:10]+' 00:00:00'
else:
obj = str(obj)
return "to_date('%s','%%Y-%%m-%%d %%H:%%M:%%S')" % obj
return None
REGEX_URI = re.compile('^(?P<user>[^:@]+)(\:(?P<password>[^@]*))?@(?P<host>\[[^/]+\]|[^\:/]+)(\:(?P<port>[0-9]+))?/(?P<db>.+)$')
def __init__(self,db,uri,pool_size=0,folder=None,db_codec ='UTF-8',
credential_decoder=IDENTITY, driver_args={},
adapter_args={}, do_connect=True, after_connection=None):
self.db = db
self.dbengine = "informix"
self.uri = uri
if do_connect: self.find_driver(adapter_args,uri)
self.pool_size = pool_size
self.folder = folder
self.db_codec = db_codec
self._after_connection = after_connection
self.find_or_make_work_folder()
self.test_query = 'SELECT COUNT(*) FROM systables;'
ruri = uri.split('://',1)[1]
m = self.REGEX_URI.match(ruri)
if not m:
raise SyntaxError(
"Invalid URI string in DAL: %s" % self.uri)
user = credential_decoder(m.group('user'))
if not user:
raise SyntaxError('User required')
password = credential_decoder(m.group('password'))
if not password:
password = ''
host = m.group('host')
if not host:
raise SyntaxError('Host name required')
db = m.group('db')
if not db:
raise SyntaxError('Database name required')
user = credential_decoder(user)
password = credential_decoder(password)
dsn = '%s@%s' % (db,host)
driver_args.update(user=user,password=password)
def connector(dsn=dsn,driver_args=driver_args):
return self.driver.connect(dsn,**driver_args)
self.connector = connector
if do_connect: self.reconnect()
[docs] def execute(self,command):
if command[-1:]==';':
command = command[:-1]
return self.log_execute(command)
[docs]class InformixSEAdapter(InformixAdapter):
""" work in progress """
[docs] def select_limitby(self, sql_s, sql_f, sql_t, sql_w, sql_o, limitby):
return 'SELECT %s %s FROM %s%s%s;' % \
(sql_s, sql_f, sql_t, sql_w, sql_o)
[docs] def rowslice(self,rows,minimum=0,maximum=None):
if maximum is None:
return rows[minimum:]
return rows[minimum:maximum]