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# postgres.py
# Copyright (C) 2005 Michael Bayer mike_mp@zzzcomputing.com
#
# This library is free software; you can redistribute it and/or
# modify it under the terms of the GNU Lesser General Public
# License as published by the Free Software Foundation; either
# version 2.1 of the License, or (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public License
# along with this library; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
import sys, StringIO, string
import sqlalchemy.sql as sql
import sqlalchemy.schema as schema
import sqlalchemy.ansisql as ansisql
from sqlalchemy.ansisql import *
colspecs = {
schema.INT : "INTEGER",
schema.CHAR : "CHAR(%(length)s)",
schema.VARCHAR : "VARCHAR(%(length)s)",
schema.TEXT : "TEXT",
schema.FLOAT : "NUMERIC(%(precision)s, %(length)s)",
schema.DECIMAL : "NUMERIC(%(precision)s, %(length)s)",
schema.TIMESTAMP : "TIMESTAMP",
schema.DATETIME : "TIMESTAMP",
schema.CLOB : "TEXT",
schema.BLOB : "BLOB",
schema.BOOLEAN : "BOOLEAN",
}
def engine(**params):
return PGSQLEngine(**params)
class PGSQLEngine(ansisql.ANSISQLEngine):
def __init__(self, **params):
ansisql.ANSISQLEngine.__init__(self, **params)
def connect_args(self):
return [[], {}]
def compile(self, statement, bindparams):
compiler = PGCompiler(self, statement, bindparams)
statement.accept_visitor(compiler)
return compiler
def last_inserted_ids(self):
return self.context.last_inserted_ids
def pre_exec(self, connection, cursor, statement, parameters, echo = None, compiled = None, **kwargs):
if compiled is None: return
if getattr(compiled, "isinsert", False):
last_inserted_ids = []
for primary_key in compiled.statement.table.primary_keys:
# pseudocode
if parameters[primary_key.key] is None:
if echo is True:
self.log(primary_key.sequence.text)
res = cursor.execute(primary_key.sequence.text)
newid = res.fetchrow()[0]
parameters[primary_key.key] = newid
last_inserted_ids.append(newid)
self.context.last_inserted_ids = last_inserted_ids
def dbapi(self):
return None
# return psycopg
def columnimpl(self, column):
return PGColumnImpl(column)
def reflecttable(self, table):
raise NotImplementedError()
class PGCompiler(ansisql.ANSICompiler):
pass
class PGColumnImpl(sql.ColumnSelectable):
def get_specification(self):
coltype = self.column.type
if isinstance(coltype, types.ClassType):
key = coltype
else:
key = coltype.__class__
return self.name + " " + colspecs[key] % {'precision': getattr(coltype, 'precision', None), 'length' : getattr(coltype, 'length', None)}
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