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# oracle/zxjdbc.py
# Copyright (C) 2005-2011 the SQLAlchemy authors and contributors <see AUTHORS file>
#
# This module is part of SQLAlchemy and is released under
# the MIT License: http://www.opensource.org/licenses/mit-license.php
"""Support for the Oracle database via the zxjdbc JDBC connector.
JDBC Driver
-----------
The official Oracle JDBC driver is at
http://www.oracle.com/technology/software/tech/java/sqlj_jdbc/index.html.
"""
import decimal
import re
from sqlalchemy import sql, types as sqltypes, util
from sqlalchemy.connectors.zxJDBC import ZxJDBCConnector
from sqlalchemy.dialects.oracle.base import OracleCompiler, OracleDialect, OracleExecutionContext
from sqlalchemy.engine import base, default
from sqlalchemy.sql import expression
SQLException = zxJDBC = None
class _ZxJDBCDate(sqltypes.Date):
def result_processor(self, dialect, coltype):
def process(value):
if value is None:
return None
else:
return value.date()
return process
class _ZxJDBCNumeric(sqltypes.Numeric):
def result_processor(self, dialect, coltype):
#XXX: does the dialect return Decimal or not???
# if it does (in all cases), we could use a None processor as well as
# the to_float generic processor
if self.asdecimal:
def process(value):
if isinstance(value, decimal.Decimal):
return value
else:
return decimal.Decimal(str(value))
else:
def process(value):
if isinstance(value, decimal.Decimal):
return float(value)
else:
return value
return process
class OracleCompiler_zxjdbc(OracleCompiler):
def returning_clause(self, stmt, returning_cols):
self.returning_cols = list(expression._select_iterables(returning_cols))
# within_columns_clause=False so that labels (foo AS bar) don't render
columns = [self.process(c, within_columns_clause=False, result_map=self.result_map)
for c in self.returning_cols]
if not hasattr(self, 'returning_parameters'):
self.returning_parameters = []
binds = []
for i, col in enumerate(self.returning_cols):
dbtype = col.type.dialect_impl(self.dialect).get_dbapi_type(self.dialect.dbapi)
self.returning_parameters.append((i + 1, dbtype))
bindparam = sql.bindparam("ret_%d" % i, value=ReturningParam(dbtype))
self.binds[bindparam.key] = bindparam
binds.append(self.bindparam_string(self._truncate_bindparam(bindparam)))
return 'RETURNING ' + ', '.join(columns) + " INTO " + ", ".join(binds)
class OracleExecutionContext_zxjdbc(OracleExecutionContext):
def pre_exec(self):
if hasattr(self.compiled, 'returning_parameters'):
# prepare a zxJDBC statement so we can grab its underlying
# OraclePreparedStatement's getReturnResultSet later
self.statement = self.cursor.prepare(self.statement)
def get_result_proxy(self):
if hasattr(self.compiled, 'returning_parameters'):
rrs = None
try:
try:
rrs = self.statement.__statement__.getReturnResultSet()
rrs.next()
except SQLException, sqle:
msg = '%s [SQLCode: %d]' % (sqle.getMessage(), sqle.getErrorCode())
if sqle.getSQLState() is not None:
msg += ' [SQLState: %s]' % sqle.getSQLState()
raise zxJDBC.Error(msg)
else:
row = tuple(self.cursor.datahandler.getPyObject(rrs, index, dbtype)
for index, dbtype in self.compiled.returning_parameters)
return ReturningResultProxy(self, row)
finally:
if rrs is not None:
try:
rrs.close()
except SQLException:
pass
self.statement.close()
return base.ResultProxy(self)
def create_cursor(self):
cursor = self._dbapi_connection.cursor()
cursor.datahandler = self.dialect.DataHandler(cursor.datahandler)
return cursor
class ReturningResultProxy(base.FullyBufferedResultProxy):
"""ResultProxy backed by the RETURNING ResultSet results."""
def __init__(self, context, returning_row):
self._returning_row = returning_row
super(ReturningResultProxy, self).__init__(context)
def _cursor_description(self):
ret = []
for c in self.context.compiled.returning_cols:
if hasattr(c, 'name'):
ret.append((c.name, c.type))
else:
ret.append((c.anon_label, c.type))
return ret
def _buffer_rows(self):
return [self._returning_row]
class ReturningParam(object):
"""A bindparam value representing a RETURNING parameter.
Specially handled by OracleReturningDataHandler.
"""
def __init__(self, type):
self.type = type
def __eq__(self, other):
if isinstance(other, ReturningParam):
return self.type == other.type
return NotImplemented
def __ne__(self, other):
if isinstance(other, ReturningParam):
return self.type != other.type
return NotImplemented
def __repr__(self):
kls = self.__class__
return '<%s.%s object at 0x%x type=%s>' % (kls.__module__, kls.__name__, id(self),
self.type)
class OracleDialect_zxjdbc(ZxJDBCConnector, OracleDialect):
jdbc_db_name = 'oracle'
jdbc_driver_name = 'oracle.jdbc.OracleDriver'
statement_compiler = OracleCompiler_zxjdbc
execution_ctx_cls = OracleExecutionContext_zxjdbc
colspecs = util.update_copy(
OracleDialect.colspecs,
{
sqltypes.Date : _ZxJDBCDate,
sqltypes.Numeric: _ZxJDBCNumeric
}
)
def __init__(self, *args, **kwargs):
super(OracleDialect_zxjdbc, self).__init__(*args, **kwargs)
global SQLException, zxJDBC
from java.sql import SQLException
from com.ziclix.python.sql import zxJDBC
from com.ziclix.python.sql.handler import OracleDataHandler
class OracleReturningDataHandler(OracleDataHandler):
"""zxJDBC DataHandler that specially handles ReturningParam."""
def setJDBCObject(self, statement, index, object, dbtype=None):
if type(object) is ReturningParam:
statement.registerReturnParameter(index, object.type)
elif dbtype is None:
OracleDataHandler.setJDBCObject(self, statement, index, object)
else:
OracleDataHandler.setJDBCObject(self, statement, index, object, dbtype)
self.DataHandler = OracleReturningDataHandler
def initialize(self, connection):
super(OracleDialect_zxjdbc, self).initialize(connection)
self.implicit_returning = connection.connection.driverversion >= '10.2'
def _create_jdbc_url(self, url):
return 'jdbc:oracle:thin:@%s:%s:%s' % (url.host, url.port or 1521, url.database)
def _get_server_version_info(self, connection):
version = re.search(r'Release ([\d\.]+)', connection.connection.dbversion).group(1)
return tuple(int(x) for x in version.split('.'))
dialect = OracleDialect_zxjdbc
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