236 lines
7.9 KiB
Python
236 lines
7.9 KiB
Python
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# oracle/zxjdbc.py
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# Copyright (C) 2005-2018 the SQLAlchemy authors and contributors
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# <see AUTHORS file>
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#
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# This module is part of SQLAlchemy and is released under
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# the MIT License: http://www.opensource.org/licenses/mit-license.php
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"""
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.. dialect:: oracle+zxjdbc
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:name: zxJDBC for Jython
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:dbapi: zxjdbc
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:connectstring: oracle+zxjdbc://user:pass@host/dbname
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:driverurl: http://www.oracle.com/technetwork/database/features/jdbc/index-091264.html
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.. note:: Jython is not supported by current versions of SQLAlchemy. The
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zxjdbc dialect should be considered as experimental.
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"""
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import decimal
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import re
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from sqlalchemy import sql, types as sqltypes, util
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from sqlalchemy.connectors.zxJDBC import ZxJDBCConnector
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from sqlalchemy.dialects.oracle.base import (OracleCompiler,
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OracleDialect,
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OracleExecutionContext)
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from sqlalchemy.engine import result as _result
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from sqlalchemy.sql import expression
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import collections
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SQLException = zxJDBC = None
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class _ZxJDBCDate(sqltypes.Date):
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def result_processor(self, dialect, coltype):
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def process(value):
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if value is None:
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return None
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else:
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return value.date()
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return process
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class _ZxJDBCNumeric(sqltypes.Numeric):
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def result_processor(self, dialect, coltype):
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# XXX: does the dialect return Decimal or not???
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# if it does (in all cases), we could use a None processor as well as
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# the to_float generic processor
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if self.asdecimal:
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def process(value):
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if isinstance(value, decimal.Decimal):
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return value
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else:
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return decimal.Decimal(str(value))
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else:
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def process(value):
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if isinstance(value, decimal.Decimal):
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return float(value)
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else:
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return value
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return process
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class OracleCompiler_zxjdbc(OracleCompiler):
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def returning_clause(self, stmt, returning_cols):
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self.returning_cols = list(
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expression._select_iterables(returning_cols))
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# within_columns_clause=False so that labels (foo AS bar) don't render
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columns = [self.process(c, within_columns_clause=False)
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for c in self.returning_cols]
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if not hasattr(self, 'returning_parameters'):
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self.returning_parameters = []
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binds = []
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for i, col in enumerate(self.returning_cols):
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dbtype = col.type.dialect_impl(
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self.dialect).get_dbapi_type(self.dialect.dbapi)
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self.returning_parameters.append((i + 1, dbtype))
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bindparam = sql.bindparam(
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"ret_%d" % i, value=ReturningParam(dbtype))
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self.binds[bindparam.key] = bindparam
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binds.append(
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self.bindparam_string(self._truncate_bindparam(bindparam)))
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return 'RETURNING ' + ', '.join(columns) + " INTO " + ", ".join(binds)
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class OracleExecutionContext_zxjdbc(OracleExecutionContext):
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def pre_exec(self):
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if hasattr(self.compiled, 'returning_parameters'):
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# prepare a zxJDBC statement so we can grab its underlying
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# OraclePreparedStatement's getReturnResultSet later
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self.statement = self.cursor.prepare(self.statement)
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def get_result_proxy(self):
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if hasattr(self.compiled, 'returning_parameters'):
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rrs = None
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try:
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try:
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rrs = self.statement.__statement__.getReturnResultSet()
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next(rrs)
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except SQLException as sqle:
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msg = '%s [SQLCode: %d]' % (
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sqle.getMessage(), sqle.getErrorCode())
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if sqle.getSQLState() is not None:
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msg += ' [SQLState: %s]' % sqle.getSQLState()
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raise zxJDBC.Error(msg)
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else:
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row = tuple(
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self.cursor.datahandler.getPyObject(
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rrs, index, dbtype)
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for index, dbtype in
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self.compiled.returning_parameters)
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return ReturningResultProxy(self, row)
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finally:
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if rrs is not None:
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try:
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rrs.close()
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except SQLException:
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pass
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self.statement.close()
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return _result.ResultProxy(self)
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def create_cursor(self):
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cursor = self._dbapi_connection.cursor()
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cursor.datahandler = self.dialect.DataHandler(cursor.datahandler)
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return cursor
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class ReturningResultProxy(_result.FullyBufferedResultProxy):
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"""ResultProxy backed by the RETURNING ResultSet results."""
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def __init__(self, context, returning_row):
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self._returning_row = returning_row
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super(ReturningResultProxy, self).__init__(context)
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def _cursor_description(self):
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ret = []
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for c in self.context.compiled.returning_cols:
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if hasattr(c, 'name'):
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ret.append((c.name, c.type))
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else:
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ret.append((c.anon_label, c.type))
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return ret
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def _buffer_rows(self):
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return collections.deque([self._returning_row])
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class ReturningParam(object):
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"""A bindparam value representing a RETURNING parameter.
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Specially handled by OracleReturningDataHandler.
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"""
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def __init__(self, type):
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self.type = type
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def __eq__(self, other):
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if isinstance(other, ReturningParam):
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return self.type == other.type
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return NotImplemented
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def __ne__(self, other):
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if isinstance(other, ReturningParam):
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return self.type != other.type
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return NotImplemented
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def __repr__(self):
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kls = self.__class__
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return '<%s.%s object at 0x%x type=%s>' % (
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kls.__module__, kls.__name__, id(self), self.type)
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class OracleDialect_zxjdbc(ZxJDBCConnector, OracleDialect):
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jdbc_db_name = 'oracle'
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jdbc_driver_name = 'oracle.jdbc.OracleDriver'
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statement_compiler = OracleCompiler_zxjdbc
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execution_ctx_cls = OracleExecutionContext_zxjdbc
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colspecs = util.update_copy(
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OracleDialect.colspecs,
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{
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sqltypes.Date: _ZxJDBCDate,
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sqltypes.Numeric: _ZxJDBCNumeric
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}
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)
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def __init__(self, *args, **kwargs):
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super(OracleDialect_zxjdbc, self).__init__(*args, **kwargs)
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global SQLException, zxJDBC
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from java.sql import SQLException
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from com.ziclix.python.sql import zxJDBC
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from com.ziclix.python.sql.handler import OracleDataHandler
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class OracleReturningDataHandler(OracleDataHandler):
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"""zxJDBC DataHandler that specially handles ReturningParam."""
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def setJDBCObject(self, statement, index, object, dbtype=None):
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if type(object) is ReturningParam:
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statement.registerReturnParameter(index, object.type)
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elif dbtype is None:
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OracleDataHandler.setJDBCObject(
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self, statement, index, object)
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else:
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OracleDataHandler.setJDBCObject(
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self, statement, index, object, dbtype)
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self.DataHandler = OracleReturningDataHandler
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def initialize(self, connection):
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super(OracleDialect_zxjdbc, self).initialize(connection)
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self.implicit_returning = \
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connection.connection.driverversion >= '10.2'
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def _create_jdbc_url(self, url):
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return 'jdbc:oracle:thin:@%s:%s:%s' % (
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url.host, url.port or 1521, url.database)
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def _get_server_version_info(self, connection):
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version = re.search(
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r'Release ([\d\.]+)', connection.connection.dbversion).group(1)
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return tuple(int(x) for x in version.split('.'))
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dialect = OracleDialect_zxjdbc
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