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# mysql.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 import *
import sqlalchemy.databases.information_schema as ischema
try:
import MySQLdb as mysql
except:
mysql = None
class MSNumeric(sqltypes.Numeric):
def get_col_spec(self):
return "NUMERIC(%(precision)s, %(length)s)" % {'precision': self.precision, 'length' : self.length}
class MSFloat(sqltypes.Float):
def get_col_spec(self):
return "FLOAT(%(precision)s)" % {'precision': self.precision}
class MSInteger(sqltypes.Integer):
def get_col_spec(self):
return "INTEGER"
class MSDateTime(sqltypes.DateTime):
def get_col_spec(self):
return "TIMESTAMP"
class MSText(sqltypes.TEXT):
def get_col_spec(self):
return "TEXT"
class MSString(sqltypes.String):
def get_col_spec(self):
return "VARCHAR(%(length)s)" % {'length' : self.length}
class MSChar(sqltypes.CHAR):
def get_col_spec(self):
return "CHAR(%(length)s)" % {'length' : self.length}
class MSBinary(sqltypes.Binary):
def get_col_spec(self):
return "BINARY"
class MSBoolean(sqltypes.Boolean):
def get_col_spec(self):
return "BOOLEAN"
colspecs = {
sqltypes.Integer : MSInteger,
sqltypes.Numeric : MSNumeric,
sqltypes.Float : MSFloat,
sqltypes.DateTime : MSDateTime,
sqltypes.String : MSString,
sqltypes.Binary : MSBinary,
sqltypes.Boolean : MSBoolean,
sqltypes.TEXT : MSText,
sqltypes.CHAR: MSChar,
}
ischema_names = {
'int' : MSInteger,
'varchar' : MSString,
'char' : MSChar,
'text' : MSText,
'decimal' : MSNumeric,
'float' : MSFloat,
'timestamp' : MSDateTime,
'binary' : MSBinary,
}
def engine(opts, **params):
return MySQLEngine(opts, **params)
def descriptor():
return {'name':'mysql',
'description':'MySQL',
'arguments':[
('user',"Database Username",None),
('passwd',"Database Password",None),
('db',"Database Name",None),
('host',"Hostname", None),
]}
class MySQLEngine(ansisql.ANSISQLEngine):
def __init__(self, opts, module = None, **params):
if module is None:
self.module = mysql
self.opts = opts or {}
ansisql.ANSISQLEngine.__init__(self, **params)
def connect_args(self):
return [[], self.opts]
def type_descriptor(self, typeobj):
return sqltypes.adapt_type(typeobj, colspecs)
def last_inserted_ids(self):
return self.context.last_inserted_ids
def rowid_column_name(self):
"""returns the ROWID column name for this engine."""
# well, for MySQL cant really count on this being there, surprise (not).
# so we do some silly hack down below in MySQLTableImpl to provide
# something for an OID column
return "_rowid"
def supports_sane_rowcount(self):
return False
def tableimpl(self, table):
"""returns a new sql.TableImpl object to correspond to the given Table object."""
return MySQLTableImpl(table)
def compiler(self, statement, bindparams, **kwargs):
return MySQLCompiler(self, statement, bindparams, **kwargs)
def schemagenerator(self, proxy, **params):
return MySQLSchemaGenerator(proxy, **params)
def get_default_schema_name(self):
if not hasattr(self, '_default_schema_name'):
self._default_schema_name = text("select database()", self).scalar()
return self._default_schema_name
def last_inserted_ids(self):
return self.context.last_inserted_ids
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]
# executemany just runs normally, since we arent using rowcount at all with mysql
# def _executemany(self, c, statement, parameters):
# """we need accurate rowcounts for updates, inserts and deletes. mysql is *also* is not nice enough
# to produce this correctly for an executemany, so we do our own executemany here."""
# rowcount = 0
# for param in parameters:
# c.execute(statement, param)
# rowcount += c.rowcount
# self.context.rowcount = rowcount
def dbapi(self):
return self.module
def reflecttable(self, table):
ischema.reflecttable(self, table, ischema_names, use_mysql=True)
class MySQLTableImpl(sql.TableImpl):
"""attached to a schema.Table to provide it with a Selectable interface
as well as other functions
"""
def _rowid_col(self):
if getattr(self, '_mysql_rowid_column', None) is None:
if len(self.table.primary_keys) > 0:
self._mysql_rowid_column = self.table.primary_keys[0]
else:
self._mysql_rowid_column = self.table.columns[self.table.columns.keys()[0]]
return self._mysql_rowid_column
rowid_column = property(lambda s: s._rowid_col())
class MySQLCompiler(ansisql.ANSICompiler):
pass
class MySQLSchemaGenerator(ansisql.ANSISchemaGenerator):
def get_column_specification(self, column, override_pk=False, first_pk=False):
colspec = column.name + " " + column.type.get_col_spec()
if not column.nullable:
colspec += " NOT NULL"
if column.primary_key:
if not override_pk:
colspec += " PRIMARY KEY"
if first_pk:
colspec += " AUTO_INCREMENT"
if column.foreign_key:
colspec += " REFERENCES %s(%s)" % (column.column.foreign_key.column.table.name, column.column.foreign_key.column.name)
return colspec
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