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# +--------------------------------------------------------------------------+
# | Licensed Materials - Property of IBM |
# | |
# | (C) Copyright IBM Corporation 2008, 2013. |
# +--------------------------------------------------------------------------+
# | This module complies with SQLAlchemy 0.8 and is |
# | Licensed under the Apache License, Version 2.0 (the "License"); |
# | you may not use this file except in compliance with the License. |
# | You may obtain a copy of the License at |
# | http://www.apache.org/licenses/LICENSE-2.0 Unless required by applicable |
# | law or agreed to in writing, software distributed under the License is |
# | distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
# | KIND, either express or implied. See the License for the specific |
# | language governing permissions and limitations under the License. |
# +--------------------------------------------------------------------------+
# | Author: Jaimy Azle |
# | Contributor: Mike Bayer |
# +--------------------------------------------------------------------------+
raise NotImplementedError(
"The zxjdbc dialect is not implemented at this time.")
# NOTE: it appears that to use zxjdbc, the "RETURNING" syntax
# must be installed in DB2, which appears to be optional. It would
# be best if the RETURNING support were built into the base dialect
# and not be local to zxjdbc here.
from decimal import Decimal as _python_Decimal
from sqlalchemy import sql, util
from sqlalchemy import types as sa_types
from sqlalchemy.engine.base import FullyBufferedResultProxy, ResultProxy
from sqlalchemy.connectors.zxJDBC import ZxJDBCConnector
from .base import DB2Dialect, DB2ExecutionContext, DB2Compiler
class ReturningResultProxy(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.
"""
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 DB2ExecutionContext_zxjdbc(DB2ExecutionContext):
def pre_exec(self):
if hasattr(self.compiled, 'returning_parameters'):
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 ResultProxy(self)
def create_cursor(self):
cursor = self._dbapi_connection.cursor()
cursor.datahandler = self.dialect.DataHandler(cursor.datahandler)
return cursor
class DB2Compiler_zxjdbc(DB2Compiler):
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 DB2Dialect_zxjdbc(ZxJDBCConnector, DB2Dialect):
supports_unicode_statements = supports_unicode_binds = \
returns_unicode_strings = supports_unicode = False
supports_sane_rowcount = False
supports_sane_multi_rowcount = False
jdbc_db_name = 'db2'
jdbc_driver_name = 'com.ibm.db2.jcc.DB2Driver'
statement_compiler = DB2Compiler_zxjdbc
execution_ctx_cls = DB2ExecutionContext_zxjdbc
@classmethod
def dbapi(cls):
global SQLException, zxJDBC
from java.sql import SQLException, Types as java_Types
from com.ziclix.python.sql import zxJDBC
from com.ziclix.python.sql import FilterDataHandler
# TODO: this should be somewhere else
class IBM_DB2DataHandler(FilterDataHandler):
def setJDBCObject(self, statement, index, object, dbtype=None):
if type(object) is ReturningParam:
statement.registerReturnParameter(index, object.type)
elif dbtype is None:
if (isinstance(object, int)):
statement.setObject(index, str(object), java_Types.BIGINT)
elif (isinstance(object, _python_Decimal)):
statement.setObject(index, str(object), java_Types.DECIMAL)
else:
statement.setObject(index, object)
else:
FilterDataHandler.setJDBCObject(self, statement, index, object, dbtype)
cls.DataHandler = IBM_DB2DataHandler
return zxJDBC
class AS400Dialect_zxjdbc(DB2Dialect_zxjdbc):
jdbc_db_name = 'as400'
jdbc_driver_name = 'com.ibm.as400.access.AS400JDBCDriver'
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