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# oracle.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 *
import sqlalchemy.types as sqltypes
try:
import cx_Oracle
except:
cx_Oracle = None
class OracleNumeric(sqltypes.Numeric):
def get_col_spec(self):
return "NUMERIC(%(precision)s, %(length)s)" % {'precision': self.precision, 'length' : self.length}
class OracleInteger(sqltypes.Integer):
def get_col_spec(self):
return "INTEGER"
class OracleDateTime(sqltypes.DateTime):
def get_col_spec(self):
return "TIMESTAMP"
class OracleText(sqltypes.TEXT):
def get_col_spec(self):
return "TEXT"
class OracleString(sqltypes.String):
def get_col_spec(self):
return "VARCHAR(%(length)s)" % {'length' : self.length}
class OracleChar(sqltypes.CHAR):
def get_col_spec(self):
return "CHAR(%(length)s)" % {'length' : self.length}
class OracleBinary(sqltypes.Binary):
def get_col_spec(self):
return "BLOB"
class OracleBoolean(sqltypes.Boolean):
def get_col_spec(self):
return "BOOLEAN"
colspecs = {
sqltypes.Integer : OracleInteger,
sqltypes.Numeric : OracleNumeric,
sqltypes.DateTime : OracleDateTime,
sqltypes.String : OracleString,
sqltypes.Binary : OracleBinary,
sqltypes.Boolean : OracleBoolean,
sqltypes.TEXT : OracleText,
sqltypes.CHAR: OracleChar,
}
def engine(*args, **params):
return OracleSQLEngine(*args, **params)
class OracleSQLEngine(ansisql.ANSISQLEngine):
def __init__(self, opts, use_ansi = True, module = None, **params):
self._use_ansi = use_ansi
self.opts = opts or {}
if module is None:
self.module = cx_Oracle
else:
self.module = module
ansisql.ANSISQLEngine.__init__(self, **params)
def dbapi(self):
return self.module
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 compiler(self, statement, bindparams):
return OracleCompiler(self, statement, bindparams)
def schemagenerator(self, proxy, **params):
return OracleSchemaGenerator(proxy, **params)
def reflecttable(self, table):
raise "not implemented"
def last_inserted_ids(self):
table = self.context.last_inserted_table
if self.context.lastrowid is not None and table is not None and len(table.primary_keys):
row = sql.select(table.primary_keys, table.rowid_column == self.context.lastrowid).execute().fetchone()
return [v for v in row]
else:
return None
def pre_exec(self, connection, cursor, statement, parameters, echo = None, compiled = None, **kwargs):
# if a sequence was explicitly defined we do it here
if compiled is None: return
if getattr(compiled, "isinsert", False):
for primary_key in compiled.statement.table.primary_keys:
if primary_key.sequence is not None and not primary_key.sequence.optional and parameters[primary_key.key] is None:
if echo is True or self.echo:
self.log("select %s.nextval from dual" % primary_key.sequence.name)
cursor.execute("select %s.nextval from dual" % primary_key.sequence.name)
newid = cursor.fetchone()[0]
parameters[primary_key.key] = newid
def post_exec(self, connection, cursor, statement, parameters, echo = None, compiled = None, **kwargs):
if compiled is None: return
if getattr(compiled, "isinsert", False):
table = compiled.statement.table
self.context.last_inserted_table = table
self.context.lastrowid = cursor.lastrowid
def _executemany(self, c, statement, parameters):
rowcount = 0
for param in parameters:
c.execute(statement, param)
rowcount += c.rowcount
self.context.rowcount = rowcount
class OracleCompiler(ansisql.ANSICompiler):
"""oracle compiler modifies the lexical structure of Select statements to work under
non-ANSI configured Oracle databases, if the use_ansi flag is False."""
def __init__(self, engine, statement, bindparams, use_ansi = True):
self._outertable = None
self._use_ansi = use_ansi
ansisql.ANSICompiler.__init__(self, engine, statement, bindparams)
def visit_join(self, join):
if self._use_ansi:
return ansisql.ANSICompiler.visit_join(self, join)
self.froms[join] = self.get_from_text(join.left) + ", " + self.get_from_text(join.right)
self.wheres[join] = join.onclause
if join.isouter:
# if outer join, push on the right side table as the current "outertable"
outertable = self._outertable
self._outertable = join.right
# now re-visit the onclause, which will be used as a where clause
# (the first visit occured via the Join object itself right before it called visit_join())
join.onclause.accept_visitor(self)
self._outertable = outertable
def visit_column(self, column):
if self._use_ansi:
return ansisql.ANSICompiler.visit_column(self, column)
if column.table is self._outertable:
self.strings[column] = "%s.%s(+)" % (column.table.name, column.name)
else:
self.strings[column] = "%s.%s" % (column.table.name, column.name)
def visit_insert(self, insert):
for c in insert.table.primary_keys:
if c.sequence is not None and not c.sequence.optional:
self.bindparams[c.key] = None
#if not insert.parameters.has_key(c.key):
# insert.parameters[c.key] = sql.bindparam(c.key)
return ansisql.ANSICompiler.visit_insert(self, insert)
class OracleSchemaGenerator(ansisql.ANSISchemaGenerator):
def get_column_specification(self, column):
colspec = column.name
colspec += " " + 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.column.foreign_key.column.table.name, column.column.foreign_key.column.name)
return colspec
def visit_sequence(self, sequence):
self.append("CREATE SEQUENCE %s" % sequence.name)
print "HI"
self.execute()
print "THERE"
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