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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, re
import sqlalchemy.sql as sql
import sqlalchemy.engine as engine
import sqlalchemy.schema as schema
import sqlalchemy.ansisql as ansisql
import sqlalchemy.types as sqltypes
from sqlalchemy.ansisql import *
from pysqlite2 import dbapi2 as sqlite
class SLNumeric(sqltypes.Numeric):
def get_col_spec(self):
return "NUMERIC(%(precision)s, %(length)s)" % {'precision': self.precision, 'length' : self.length}
class SLInteger(sqltypes.Integer):
def get_col_spec(self):
return "INTEGER"
class SLDateTime(sqltypes.DateTime):
def get_col_spec(self):
return "TIMESTAMP"
class SLText(sqltypes.TEXT):
def get_col_spec(self):
return "TEXT"
class SLString(sqltypes.String):
def get_col_spec(self):
return "VARCHAR(%(length)s)" % {'length' : self.length}
class SLChar(sqltypes.CHAR):
def get_col_spec(self):
return "CHAR(%(length)s)" % {'length' : self.length}
class SLBinary(sqltypes.Binary):
def get_col_spec(self):
return "BLOB"
class SLBoolean(sqltypes.Boolean):
def get_col_spec(self):
return "BOOLEAN"
colspecs = {
sqltypes.Integer : SLInteger,
sqltypes.Numeric : SLNumeric,
sqltypes.DateTime : SLDateTime,
sqltypes.String : SLString,
sqltypes.Binary : SLBinary,
sqltypes.Boolean : SLBoolean,
sqltypes.TEXT : SLText,
sqltypes.CHAR: SLChar,
}
pragma_names = {
'INTEGER' : SLInteger,
'VARCHAR' : SLString,
'CHAR' : SLChar,
'TEXT' : SLText,
'NUMERIC' : SLNumeric,
'TIMESTAMP' : SLDateTime,
'BLOB' : SLBinary,
}
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 post_exec(self, connection, cursor, statement, parameters, echo = None, compiled = None, **kwargs):
if compiled is None: return
if getattr(compiled, "isinsert", False):
self.context.last_inserted_ids = [cursor.lastrowid]
def type_descriptor(self, typeobj):
return sqltypes.adapt_type(typeobj, colspecs)
def last_inserted_ids(self):
return self.context.last_inserted_ids
def connect_args(self):
return ([self.filename], self.opts)
def compiler(self, statement, bindparams, **kwargs):
return SQLiteCompiler(self, statement, bindparams, **kwargs)
def dbapi(self):
return sqlite
def schemagenerator(self, proxy, **params):
return SQLiteSchemaGenerator(proxy, **params)
def reflecttable(self, table):
c = self.execute("PRAGMA table_info(" + table.name + ")", {})
while True:
row = c.fetchone()
if row is None:
break
#print "row! " + repr(row)
(name, type, nullable, primary_key) = (row[1], row[2].upper(), not row[3], row[5])
match = re.match(r'(\w+)(\(.*?\))?', type)
coltype = match.group(1)
args = match.group(2)
#print "coltype: " + repr(coltype) + " args: " + repr(args)
coltype = pragma_names[coltype]
if args is not None:
args = re.findall(r'(\d+)', args)
#print "args! " +repr(args)
coltype = coltype(*args)
table.append_item(schema.Column(name, coltype, primary_key = primary_key, nullable = nullable))
c = self.execute("PRAGMA foreign_key_list(" + table.name + ")", {})
while True:
row = c.fetchone()
if row is None:
break
(tablename, localcol, remotecol) = (row[2], row[3], row[4])
#print "row! " + repr(row)
remotetable = Table(tablename, self, autoload = True)
table.c[localcol].foreign_key = schema.ForeignKey(remotetable.c[remotecol])
class SQLiteCompiler(ansisql.ANSICompiler):
pass
class SQLiteSchemaGenerator(ansisql.ANSISchemaGenerator):
def get_column_specification(self, column):
colspec = column.name + " " + column.type.get_col_spec()
if not column.nullable:
colspec += " NOT NULL"
if column.primary_key:
colspec += " PRIMARY KEY"
if column.foreign_key:
colspec += " REFERENCES %s(%s)" % (column.foreign_key.column.table.name, column.foreign_key.column.name)
return colspec
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