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# sqlite.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, types
import sqlalchemy.sql as sql
import sqlalchemy.engine as engine
import sqlalchemy.schema as schema
import sqlalchemy.ansisql as ansisql
from sqlalchemy.ansisql import *
from pysqlite2 import dbapi2 as sqlite
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(filename, opts, **params):
return SQLiteSQLEngine(filename, opts, **params)
class SQLiteSQLEngine(ansisql.ANSISQLEngine):
def __init__(self, filename, opts, **params):
self.filename = filename
self.opts = opts or {}
ansisql.ANSISQLEngine.__init__(self, **params)
def connect_args(self):
return ([self.filename], self.opts)
def compile(self, statement, bindparams):
compiler = SQLiteCompiler(statement, bindparams)
statement.accept_visitor(compiler)
return compiler
def dbapi(self):
return sqlite
def columnimpl(self, column):
return SQLiteColumnImpl(column)
def reflecttable(self, table):
raise NotImplementedError()
class SQLiteCompiler(ansisql.ANSICompiler):
pass
class SQLiteColumnImpl(sql.ColumnSelectable):
def _get_specification(self):
coltype = self.column.type
if type(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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