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web2py/gluon/contrib/pypyodbc.py
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mdipierro 244d3c68eb fixed newlines
2013-03-29 02:13:35 -05:00

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# -*- coding: utf-8 -*-
# PyPyODBC is develped from RealPyODBC 0.1 beta released in 2004 by Michele Petrazzo. Thanks Michele.
# The MIT License (MIT)
#
# Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated
# documentation files (the "Software"), to deal in the Software without restriction, including without limitation
# the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software,
# and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in all copies or substantial portions
# of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO
# THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO #EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF
# CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
# DEALINGS IN THE SOFTWARE.
import sys, os, datetime, ctypes, threading
from decimal import Decimal
try:
bytearray
except NameError:
# pre version 2.6 python does not have the bytearray type
bytearray = str
if not hasattr(ctypes, 'c_ssize_t'):
if ctypes.sizeof(ctypes.c_uint) == ctypes.sizeof(ctypes.c_void_p):
ctypes.c_ssize_t = ctypes.c_int
elif ctypes.sizeof(ctypes.c_ulong) == ctypes.sizeof(ctypes.c_void_p):
ctypes.c_ssize_t = ctypes.c_long
elif ctypes.sizeof(ctypes.c_ulonglong) == ctypes.sizeof(ctypes.c_void_p):
ctypes.c_ssize_t = ctypes.c_longlong
DEBUG = 0
# Comment out all "if DEBUG:" statements like below for production
if DEBUG: print 'DEBUGGING'
pooling = True
lock = threading.Lock()
shared_env_h = None
apilevel = '2.0'
paramstyle = 'qmark'
threadsafety = 1
version = '0.9.3'
lowercase=True
SQLWCHAR_SIZE = ctypes.sizeof(ctypes.c_wchar)
#determin the size of Py_UNICODE
#sys.maxunicode > 65536 and 'UCS4' or 'UCS2'
UNICODE_SIZE = sys.maxunicode > 65536 and 4 or 2
# Define ODBC constants. They are widly used in ODBC documents and programs
# They are defined in cpp header files: sql.h sqlext.h sqltypes.h sqlucode.h
# and you can get these files from the mingw32-runtime_3.13-1_all.deb package
SQL_ATTR_ODBC_VERSION, SQL_OV_ODBC2, SQL_OV_ODBC3 = 200, 2, 3
SQL_DRIVER_NOPROMPT = 0
SQL_ATTR_CONNECTION_POOLING = 201; SQL_CP_ONE_PER_HENV = 2
SQL_FETCH_NEXT, SQL_FETCH_FIRST, SQL_FETCH_LAST = 0x01, 0x02, 0x04
SQL_NULL_HANDLE, SQL_HANDLE_ENV, SQL_HANDLE_DBC, SQL_HANDLE_STMT = 0, 1, 2, 3
SQL_SUCCESS, SQL_SUCCESS_WITH_INFO = 0, 1
SQL_NO_DATA = 100; SQL_NO_TOTAL = -4
SQL_ATTR_ACCESS_MODE = SQL_ACCESS_MODE = 101
SQL_ATTR_AUTOCOMMIT = SQL_AUTOCOMMIT = 102
SQL_MODE_DEFAULT = SQL_MODE_READ_WRITE = 0; SQL_MODE_READ_ONLY = 1
SQL_AUTOCOMMIT_OFF, SQL_AUTOCOMMIT_ON = 0, 1
SQL_IS_UINTEGER = -5
SQL_ATTR_LOGIN_TIMEOUT = 103; SQL_ATTR_CONNECTION_TIMEOUT = 113
SQL_COMMIT, SQL_ROLLBACK = 0, 1
SQL_INDEX_UNIQUE,SQL_INDEX_ALL = 0,1
SQL_QUICK,SQL_ENSURE = 0,1
SQL_FETCH_NEXT = 1
SQL_COLUMN_DISPLAY_SIZE = 6
SQL_INVALID_HANDLE = -2
SQL_NO_DATA_FOUND = 100; SQL_NULL_DATA = -1; SQL_NTS = -3
SQL_HANDLE_DESCR = 4
SQL_TABLE_NAMES = 3
SQL_PARAM_INPUT = 1; SQL_PARAM_INPUT_OUTPUT = 2
SQL_PARAM_TYPE_UNKNOWN = 0
SQL_RESULT_COL = 3
SQL_PARAM_OUTPUT = 4
SQL_RETURN_VALUE = 5
SQL_PARAM_TYPE_DEFAULT = SQL_PARAM_INPUT_OUTPUT
SQL_RESET_PARAMS = 3
SQL_UNBIND = 2
SQL_CLOSE = 0
SQL_TYPE_NULL = 0
SQL_DECIMAL = 3
SQL_FLOAT = 6
SQL_DATE = 9
SQL_TIME = 10
SQL_TIMESTAMP = 11
SQL_VARCHAR = 12
SQL_LONGVARCHAR = -1
SQL_VARBINARY = -3
SQL_LONGVARBINARY = -4
SQL_BIGINT = -5
SQL_WVARCHAR = -9
SQL_WLONGVARCHAR = -10
SQL_ALL_TYPES = 0
SQL_SIGNED_OFFSET = -20
SQL_C_CHAR = SQL_CHAR = 1
SQL_C_NUMERIC = SQL_NUMERIC = 2
SQL_C_LONG = SQL_INTEGER = 4
SQL_C_SLONG = SQL_C_LONG + SQL_SIGNED_OFFSET
SQL_C_SHORT = SQL_SMALLINT = 5
SQL_C_FLOAT = SQL_REAL = 7
SQL_C_DOUBLE = SQL_DOUBLE = 8
SQL_C_TYPE_DATE = SQL_TYPE_DATE = 91
SQL_C_TYPE_TIME = SQL_TYPE_TIME = 92
SQL_C_BINARY = SQL_BINARY = -2
SQL_C_SBIGINT = SQL_BIGINT + SQL_SIGNED_OFFSET
SQL_C_TINYINT = SQL_TINYINT = -6
SQL_C_BIT = SQL_BIT = -7
SQL_C_WCHAR = SQL_WCHAR = -8
SQL_C_GUID = SQL_GUID = -11
SQL_C_TYPE_TIMESTAMP = SQL_TYPE_TIMESTAMP = 93
SQL_C_DEFAULT = 99
SQL_SS_TIME2 = -154
SQL_DESC_DISPLAY_SIZE = SQL_COLUMN_DISPLAY_SIZE
def dttm_cvt(x):
if x == '': return None
else: return datetime.datetime(int(x[0:4]),int(x[5:7]),int(x[8:10]),int(x[10:13]),int(x[14:16]),int(x[17:19]),int(x[20:].ljust(6,'0')))
def tm_cvt(x):
if x == '': return None
else: return datetime.time(int(x[0:2]),int(x[3:5]),int(x[6:8]),int(x[9:].ljust(6,'0')))
def dt_cvt(x):
if x == '': return None
else: return datetime.date(int(x[0:4]),int(x[5:7]),int(x[8:10]))
# Below defines The constants for sqlgetinfo method, and their coresponding return types
SQL_QUALIFIER_LOCATION = 114
SQL_QUALIFIER_NAME_SEPARATOR = 41
SQL_QUALIFIER_TERM = 42
SQL_QUALIFIER_USAGE = 92
SQL_OWNER_TERM = 39
SQL_OWNER_USAGE = 91
SQL_ACCESSIBLE_PROCEDURES = 20
SQL_ACCESSIBLE_TABLES = 19
SQL_ACTIVE_ENVIRONMENTS = 116
SQL_AGGREGATE_FUNCTIONS = 169
SQL_ALTER_DOMAIN = 117
SQL_ALTER_TABLE = 86
SQL_ASYNC_MODE = 10021
SQL_BATCH_ROW_COUNT = 120
SQL_BATCH_SUPPORT = 121
SQL_BOOKMARK_PERSISTENCE = 82
SQL_CATALOG_LOCATION = SQL_QUALIFIER_LOCATION
SQL_CATALOG_NAME = 10003
SQL_CATALOG_NAME_SEPARATOR = SQL_QUALIFIER_NAME_SEPARATOR
SQL_CATALOG_TERM = SQL_QUALIFIER_TERM
SQL_CATALOG_USAGE = SQL_QUALIFIER_USAGE
SQL_COLLATION_SEQ = 10004
SQL_COLUMN_ALIAS = 87
SQL_CONCAT_NULL_BEHAVIOR = 22
SQL_CONVERT_FUNCTIONS = 48
SQL_CONVERT_VARCHAR = 70
SQL_CORRELATION_NAME = 74
SQL_CREATE_ASSERTION = 127
SQL_CREATE_CHARACTER_SET = 128
SQL_CREATE_COLLATION = 129
SQL_CREATE_DOMAIN = 130
SQL_CREATE_SCHEMA = 131
SQL_CREATE_TABLE = 132
SQL_CREATE_TRANSLATION = 133
SQL_CREATE_VIEW = 134
SQL_CURSOR_COMMIT_BEHAVIOR = 23
SQL_CURSOR_ROLLBACK_BEHAVIOR = 24
SQL_DATABASE_NAME = 16
SQL_DATA_SOURCE_NAME = 2
SQL_DATA_SOURCE_READ_ONLY = 25
SQL_DATETIME_LITERALS = 119
SQL_DBMS_NAME = 17
SQL_DBMS_VER = 18
SQL_DDL_INDEX = 170
SQL_DEFAULT_TXN_ISOLATION = 26
SQL_DESCRIBE_PARAMETER = 10002
SQL_DM_VER = 171
SQL_DRIVER_NAME = 6
SQL_DRIVER_ODBC_VER = 77
SQL_DRIVER_VER = 7
SQL_DROP_ASSERTION = 136
SQL_DROP_CHARACTER_SET = 137
SQL_DROP_COLLATION = 138
SQL_DROP_DOMAIN = 139
SQL_DROP_SCHEMA = 140
SQL_DROP_TABLE = 141
SQL_DROP_TRANSLATION = 142
SQL_DROP_VIEW = 143
SQL_DYNAMIC_CURSOR_ATTRIBUTES1 = 144
SQL_DYNAMIC_CURSOR_ATTRIBUTES2 = 145
SQL_EXPRESSIONS_IN_ORDERBY = 27
SQL_FILE_USAGE = 84
SQL_FORWARD_ONLY_CURSOR_ATTRIBUTES1 = 146
SQL_FORWARD_ONLY_CURSOR_ATTRIBUTES2 = 147
SQL_GETDATA_EXTENSIONS = 81
SQL_GROUP_BY = 88
SQL_IDENTIFIER_CASE = 28
SQL_IDENTIFIER_QUOTE_CHAR = 29
SQL_INDEX_KEYWORDS = 148
SQL_INFO_SCHEMA_VIEWS = 149
SQL_INSERT_STATEMENT = 172
SQL_INTEGRITY = 73
SQL_KEYSET_CURSOR_ATTRIBUTES1 = 150
SQL_KEYSET_CURSOR_ATTRIBUTES2 = 151
SQL_KEYWORDS = 89
SQL_LIKE_ESCAPE_CLAUSE = 113
SQL_MAX_ASYNC_CONCURRENT_STATEMENTS = 10022
SQL_MAX_BINARY_LITERAL_LEN = 112
SQL_MAX_CATALOG_NAME_LEN = 34
SQL_MAX_CHAR_LITERAL_LEN = 108
SQL_MAX_COLUMNS_IN_GROUP_BY = 97
SQL_MAX_COLUMNS_IN_INDEX = 98
SQL_MAX_COLUMNS_IN_ORDER_BY = 99
SQL_MAX_COLUMNS_IN_SELECT = 100
SQL_MAX_COLUMNS_IN_TABLE = 101
SQL_MAX_COLUMN_NAME_LEN = 30
SQL_MAX_CONCURRENT_ACTIVITIES = 1
SQL_MAX_CURSOR_NAME_LEN = 31
SQL_MAX_DRIVER_CONNECTIONS = 0
SQL_MAX_IDENTIFIER_LEN = 10005
SQL_MAX_INDEX_SIZE = 102
SQL_MAX_PROCEDURE_NAME_LEN = 33
SQL_MAX_ROW_SIZE = 104
SQL_MAX_ROW_SIZE_INCLUDES_LONG = 103
SQL_MAX_SCHEMA_NAME_LEN = 32
SQL_MAX_STATEMENT_LEN = 105
SQL_MAX_TABLES_IN_SELECT = 106
SQL_MAX_TABLE_NAME_LEN = 35
SQL_MAX_USER_NAME_LEN = 107
SQL_MULTIPLE_ACTIVE_TXN = 37
SQL_MULT_RESULT_SETS = 36
SQL_NEED_LONG_DATA_LEN = 111
SQL_NON_NULLABLE_COLUMNS = 75
SQL_NULL_COLLATION = 85
SQL_NUMERIC_FUNCTIONS = 49
SQL_ODBC_INTERFACE_CONFORMANCE = 152
SQL_ODBC_VER = 10
SQL_OJ_CAPABILITIES = 65003
SQL_ORDER_BY_COLUMNS_IN_SELECT = 90
SQL_PARAM_ARRAY_ROW_COUNTS = 153
SQL_PARAM_ARRAY_SELECTS = 154
SQL_PROCEDURES = 21
SQL_PROCEDURE_TERM = 40
SQL_QUOTED_IDENTIFIER_CASE = 93
SQL_ROW_UPDATES = 11
SQL_SCHEMA_TERM = SQL_OWNER_TERM
SQL_SCHEMA_USAGE = SQL_OWNER_USAGE
SQL_SCROLL_OPTIONS = 44
SQL_SEARCH_PATTERN_ESCAPE = 14
SQL_SERVER_NAME = 13
SQL_SPECIAL_CHARACTERS = 94
SQL_SQL92_DATETIME_FUNCTIONS = 155
SQL_SQL92_FOREIGN_KEY_DELETE_RULE = 156
SQL_SQL92_FOREIGN_KEY_UPDATE_RULE = 157
SQL_SQL92_GRANT = 158
SQL_SQL92_NUMERIC_VALUE_FUNCTIONS = 159
SQL_SQL92_PREDICATES = 160
SQL_SQL92_RELATIONAL_JOIN_OPERATORS = 161
SQL_SQL92_REVOKE = 162
SQL_SQL92_ROW_VALUE_CONSTRUCTOR = 163
SQL_SQL92_STRING_FUNCTIONS = 164
SQL_SQL92_VALUE_EXPRESSIONS = 165
SQL_SQL_CONFORMANCE = 118
SQL_STANDARD_CLI_CONFORMANCE = 166
SQL_STATIC_CURSOR_ATTRIBUTES1 = 167
SQL_STATIC_CURSOR_ATTRIBUTES2 = 168
SQL_STRING_FUNCTIONS = 50
SQL_SUBQUERIES = 95
SQL_SYSTEM_FUNCTIONS = 51
SQL_TABLE_TERM = 45
SQL_TIMEDATE_ADD_INTERVALS = 109
SQL_TIMEDATE_DIFF_INTERVALS = 110
SQL_TIMEDATE_FUNCTIONS = 52
SQL_TXN_CAPABLE = 46
SQL_TXN_ISOLATION_OPTION = 72
SQL_UNION = 96
SQL_USER_NAME = 47
SQL_XOPEN_CLI_YEAR = 10000
aInfoTypes = {
SQL_ACCESSIBLE_PROCEDURES : 'GI_YESNO',SQL_ACCESSIBLE_TABLES : 'GI_YESNO',SQL_ACTIVE_ENVIRONMENTS : 'GI_USMALLINT',
SQL_AGGREGATE_FUNCTIONS : 'GI_UINTEGER',SQL_ALTER_DOMAIN : 'GI_UINTEGER',
SQL_ALTER_TABLE : 'GI_UINTEGER',SQL_ASYNC_MODE : 'GI_UINTEGER',SQL_BATCH_ROW_COUNT : 'GI_UINTEGER',
SQL_BATCH_SUPPORT : 'GI_UINTEGER',SQL_BOOKMARK_PERSISTENCE : 'GI_UINTEGER',SQL_CATALOG_LOCATION : 'GI_USMALLINT',
SQL_CATALOG_NAME : 'GI_YESNO',SQL_CATALOG_NAME_SEPARATOR : 'GI_STRING',SQL_CATALOG_TERM : 'GI_STRING',
SQL_CATALOG_USAGE : 'GI_UINTEGER',SQL_COLLATION_SEQ : 'GI_STRING',SQL_COLUMN_ALIAS : 'GI_YESNO',
SQL_CONCAT_NULL_BEHAVIOR : 'GI_USMALLINT',SQL_CONVERT_FUNCTIONS : 'GI_UINTEGER',
SQL_CONVERT_VARCHAR : 'GI_UINTEGER',SQL_CORRELATION_NAME : 'GI_USMALLINT',
SQL_CREATE_ASSERTION : 'GI_UINTEGER',SQL_CREATE_CHARACTER_SET : 'GI_UINTEGER',
SQL_CREATE_COLLATION : 'GI_UINTEGER',SQL_CREATE_DOMAIN : 'GI_UINTEGER',SQL_CREATE_SCHEMA : 'GI_UINTEGER',
SQL_CREATE_TABLE : 'GI_UINTEGER',SQL_CREATE_TRANSLATION : 'GI_UINTEGER',SQL_CREATE_VIEW : 'GI_UINTEGER',
SQL_CURSOR_COMMIT_BEHAVIOR : 'GI_USMALLINT',SQL_CURSOR_ROLLBACK_BEHAVIOR : 'GI_USMALLINT',SQL_DATABASE_NAME : 'GI_STRING',
SQL_DATA_SOURCE_NAME : 'GI_STRING',SQL_DATA_SOURCE_READ_ONLY : 'GI_YESNO',SQL_DATETIME_LITERALS : 'GI_UINTEGER',
SQL_DBMS_NAME : 'GI_STRING',SQL_DBMS_VER : 'GI_STRING',SQL_DDL_INDEX : 'GI_UINTEGER',
SQL_DEFAULT_TXN_ISOLATION : 'GI_UINTEGER',SQL_DESCRIBE_PARAMETER : 'GI_YESNO',SQL_DM_VER : 'GI_STRING',
SQL_DRIVER_NAME : 'GI_STRING',SQL_DRIVER_ODBC_VER : 'GI_STRING',SQL_DRIVER_VER : 'GI_STRING',
SQL_DROP_ASSERTION : 'GI_UINTEGER',SQL_DROP_CHARACTER_SET : 'GI_UINTEGER',
SQL_DROP_COLLATION : 'GI_UINTEGER',SQL_DROP_DOMAIN : 'GI_UINTEGER',
SQL_DROP_SCHEMA : 'GI_UINTEGER',SQL_DROP_TABLE : 'GI_UINTEGER',SQL_DROP_TRANSLATION : 'GI_UINTEGER',
SQL_DROP_VIEW : 'GI_UINTEGER',SQL_DYNAMIC_CURSOR_ATTRIBUTES1 : 'GI_UINTEGER',SQL_DYNAMIC_CURSOR_ATTRIBUTES2 : 'GI_UINTEGER',
SQL_EXPRESSIONS_IN_ORDERBY : 'GI_YESNO',SQL_FILE_USAGE : 'GI_USMALLINT',
SQL_FORWARD_ONLY_CURSOR_ATTRIBUTES1 : 'GI_UINTEGER',SQL_FORWARD_ONLY_CURSOR_ATTRIBUTES2 : 'GI_UINTEGER',
SQL_GETDATA_EXTENSIONS : 'GI_UINTEGER',SQL_GROUP_BY : 'GI_USMALLINT',SQL_IDENTIFIER_CASE : 'GI_USMALLINT',
SQL_IDENTIFIER_QUOTE_CHAR : 'GI_STRING',SQL_INDEX_KEYWORDS : 'GI_UINTEGER',SQL_INFO_SCHEMA_VIEWS : 'GI_UINTEGER',
SQL_INSERT_STATEMENT : 'GI_UINTEGER',SQL_INTEGRITY : 'GI_YESNO',SQL_KEYSET_CURSOR_ATTRIBUTES1 : 'GI_UINTEGER',
SQL_KEYSET_CURSOR_ATTRIBUTES2 : 'GI_UINTEGER',SQL_KEYWORDS : 'GI_STRING',
SQL_LIKE_ESCAPE_CLAUSE : 'GI_YESNO',SQL_MAX_ASYNC_CONCURRENT_STATEMENTS : 'GI_UINTEGER',
SQL_MAX_BINARY_LITERAL_LEN : 'GI_UINTEGER',SQL_MAX_CATALOG_NAME_LEN : 'GI_USMALLINT',
SQL_MAX_CHAR_LITERAL_LEN : 'GI_UINTEGER',SQL_MAX_COLUMNS_IN_GROUP_BY : 'GI_USMALLINT',
SQL_MAX_COLUMNS_IN_INDEX : 'GI_USMALLINT',SQL_MAX_COLUMNS_IN_ORDER_BY : 'GI_USMALLINT',
SQL_MAX_COLUMNS_IN_SELECT : 'GI_USMALLINT',SQL_MAX_COLUMNS_IN_TABLE : 'GI_USMALLINT',
SQL_MAX_COLUMN_NAME_LEN : 'GI_USMALLINT',SQL_MAX_CONCURRENT_ACTIVITIES : 'GI_USMALLINT',
SQL_MAX_CURSOR_NAME_LEN : 'GI_USMALLINT',SQL_MAX_DRIVER_CONNECTIONS : 'GI_USMALLINT',
SQL_MAX_IDENTIFIER_LEN : 'GI_USMALLINT',SQL_MAX_INDEX_SIZE : 'GI_UINTEGER',
SQL_MAX_PROCEDURE_NAME_LEN : 'GI_USMALLINT',SQL_MAX_ROW_SIZE : 'GI_UINTEGER',
SQL_MAX_ROW_SIZE_INCLUDES_LONG : 'GI_YESNO',SQL_MAX_SCHEMA_NAME_LEN : 'GI_USMALLINT',
SQL_MAX_STATEMENT_LEN : 'GI_UINTEGER',SQL_MAX_TABLES_IN_SELECT : 'GI_USMALLINT',
SQL_MAX_TABLE_NAME_LEN : 'GI_USMALLINT',SQL_MAX_USER_NAME_LEN : 'GI_USMALLINT',
SQL_MULTIPLE_ACTIVE_TXN : 'GI_YESNO',SQL_MULT_RESULT_SETS : 'GI_YESNO',
SQL_NEED_LONG_DATA_LEN : 'GI_YESNO',SQL_NON_NULLABLE_COLUMNS : 'GI_USMALLINT',
SQL_NULL_COLLATION : 'GI_USMALLINT',SQL_NUMERIC_FUNCTIONS : 'GI_UINTEGER',
SQL_ODBC_INTERFACE_CONFORMANCE : 'GI_UINTEGER',SQL_ODBC_VER : 'GI_STRING',SQL_OJ_CAPABILITIES : 'GI_UINTEGER',
SQL_ORDER_BY_COLUMNS_IN_SELECT : 'GI_YESNO',SQL_PARAM_ARRAY_ROW_COUNTS : 'GI_UINTEGER',
SQL_PARAM_ARRAY_SELECTS : 'GI_UINTEGER',SQL_PROCEDURES : 'GI_YESNO',SQL_PROCEDURE_TERM : 'GI_STRING',
SQL_QUOTED_IDENTIFIER_CASE : 'GI_USMALLINT',SQL_ROW_UPDATES : 'GI_YESNO',SQL_SCHEMA_TERM : 'GI_STRING',
SQL_SCHEMA_USAGE : 'GI_UINTEGER',SQL_SCROLL_OPTIONS : 'GI_UINTEGER',SQL_SEARCH_PATTERN_ESCAPE : 'GI_STRING',
SQL_SERVER_NAME : 'GI_STRING',SQL_SPECIAL_CHARACTERS : 'GI_STRING',SQL_SQL92_DATETIME_FUNCTIONS : 'GI_UINTEGER',
SQL_SQL92_FOREIGN_KEY_DELETE_RULE : 'GI_UINTEGER',SQL_SQL92_FOREIGN_KEY_UPDATE_RULE : 'GI_UINTEGER',
SQL_SQL92_GRANT : 'GI_UINTEGER',SQL_SQL92_NUMERIC_VALUE_FUNCTIONS : 'GI_UINTEGER',
SQL_SQL92_PREDICATES : 'GI_UINTEGER',SQL_SQL92_RELATIONAL_JOIN_OPERATORS : 'GI_UINTEGER',
SQL_SQL92_REVOKE : 'GI_UINTEGER',SQL_SQL92_ROW_VALUE_CONSTRUCTOR : 'GI_UINTEGER',
SQL_SQL92_STRING_FUNCTIONS : 'GI_UINTEGER',SQL_SQL92_VALUE_EXPRESSIONS : 'GI_UINTEGER',
SQL_SQL_CONFORMANCE : 'GI_UINTEGER',SQL_STANDARD_CLI_CONFORMANCE : 'GI_UINTEGER',
SQL_STATIC_CURSOR_ATTRIBUTES1 : 'GI_UINTEGER',SQL_STATIC_CURSOR_ATTRIBUTES2 : 'GI_UINTEGER',
SQL_STRING_FUNCTIONS : 'GI_UINTEGER',SQL_SUBQUERIES : 'GI_UINTEGER',
SQL_SYSTEM_FUNCTIONS : 'GI_UINTEGER',SQL_TABLE_TERM : 'GI_STRING',SQL_TIMEDATE_ADD_INTERVALS : 'GI_UINTEGER',
SQL_TIMEDATE_DIFF_INTERVALS : 'GI_UINTEGER',SQL_TIMEDATE_FUNCTIONS : 'GI_UINTEGER',
SQL_TXN_CAPABLE : 'GI_USMALLINT',SQL_TXN_ISOLATION_OPTION : 'GI_UINTEGER',
SQL_UNION : 'GI_UINTEGER',SQL_USER_NAME : 'GI_STRING',SQL_XOPEN_CLI_YEAR : 'GI_STRING',
}
#Definations for types
BINARY = bytearray
Binary = bytearray
DATETIME = datetime.datetime
Date = datetime.date
Time = datetime.time
Timestamp = datetime.datetime
STRING = str
NUMBER = float
ROWID = int
DateFromTicks = datetime.date.fromtimestamp
TimeFromTicks = lambda x: datetime.datetime.fromtimestamp(x).time()
TimestampFromTicks = datetime.datetime.fromtimestamp
#Define exceptions
class OdbcNoLibrary(Exception):
def __init__(self, value):
self.value = value
def __str__(self):
return repr(self.value)
class OdbcLibraryError(Exception):
def __init__(self, value):
self.value = value
def __str__(self):
return repr(self.value)
class OdbcInvalidHandle(Exception):
def __init__(self, value):
self.value = value
def __str__(self):
return repr(self.value)
class OdbcGenericError(Exception):
def __init__(self, value):
self.value = value
def __str__(self):
return repr(self.value)
class Warning(StandardError):
def __init__(self, error_code, error_desc):
self.value = (error_code, error_desc)
self.args = (error_code, error_desc)
class Error(StandardError):
def __init__(self, error_code, error_desc):
self.value = (error_code, error_desc)
self.args = (error_code, error_desc)
class InterfaceError(Error):
def __init__(self, error_code, error_desc):
self.value = (error_code, error_desc)
self.args = (error_code, error_desc)
class DatabaseError(Error):
def __init__(self, error_code, error_desc):
self.value = (error_code, error_desc)
self.args = (error_code, error_desc)
class InternalError(DatabaseError):
def __init__(self, error_code, error_desc):
self.value = (error_code, error_desc)
self.args = (error_code, error_desc)
class ProgrammingError(DatabaseError):
def __init__(self, error_code, error_desc):
self.value = (error_code, error_desc)
self.args = (error_code, error_desc)
class DataError(DatabaseError):
def __init__(self, error_code, error_desc):
self.value = (error_code, error_desc)
self.args = (error_code, error_desc)
class IntegrityError(DatabaseError):
def __init__(self, error_code, error_desc):
self.value = (error_code, error_desc)
self.args = (error_code, error_desc)
class NotSupportedError(Error):
def __init__(self, error_code, error_desc):
self.value = (error_code, error_desc)
self.args = (error_code, error_desc)
class OperationalError(DatabaseError):
def __init__(self, error_code, error_desc):
self.value = (error_code, error_desc)
self.args = (error_code, error_desc)
# Get the References of the platform's ODBC functions via ctypes
if sys.platform in ('win32','cli'):
ODBC_API = ctypes.windll.odbc32
# On Windows, the size of SQLWCHAR is hardcoded to 2-bytes.
SQLWCHAR_SIZE = ctypes.sizeof(ctypes.c_ushort)
else:
# Set load the library on linux
try:
# First try direct loading libodbc.so
ODBC_API = ctypes.cdll.LoadLibrary('libodbc.so')
except:
# If direct loading libodbc.so failed
# We try finding the libodbc.so by using find_library
from ctypes.util import find_library
library = find_library('odbc')
if library is None:
# If find_library still can not find the library
# we try finding it manually from where libodbc.so usually appears
lib_paths = ("/usr/lib/libodbc.so","/usr/lib/i386-linux-gnu/libodbc.so","/usr/lib/x86_64-linux-gnu/libodbc.so")
lib_paths = [path for path in lib_paths if os.path.exists(path)]
if len(lib_paths) == 0 :
raise OdbcNoLibrary, 'ODBC Library is not found'
else:
library = lib_paths[0]
# Then we try loading the found libodbc.so again
try:
ODBC_API = ctypes.cdll.LoadLibrary(library)
except:
# If still fail loading, abort.
raise OdbcLibraryError, 'Error while loading %s' % library
# unixODBC defaults to 2-bytes SQLWCHAR, unless "-DSQL_WCHART_CONVERT" was
# added to CFLAGS, in which case it will be the size of wchar_t.
# Note that using 4-bytes SQLWCHAR will break most ODBC drivers, as driver
# development mostly targets the Windows platform.
import commands
status, output = commands.getstatusoutput('odbc_config --cflags')
if status == 0 and 'SQL_WCHART_CONVERT' in output:
SQLWCHAR_SIZE = ctypes.sizeof(ctypes.c_wchar)
else:
SQLWCHAR_SIZE = ctypes.sizeof(ctypes.c_ushort)
create_buffer_u = ctypes.create_unicode_buffer
create_buffer = ctypes.create_string_buffer
wchar_type = ctypes.c_wchar_p
to_unicode = lambda s: s
from_buffer_u = lambda buffer: buffer.value
# This is the common case on Linux, which uses wide Python build together with
# the default unixODBC without the "-DSQL_WCHART_CONVERT" CFLAGS.
if UNICODE_SIZE > SQLWCHAR_SIZE:
# We can only use unicode buffer if the size of wchar_t (UNICODE_SIZE) is
# the same as the size expected by the driver manager (SQLWCHAR_SIZE).
create_buffer_u = create_buffer
wchar_type = ctypes.c_char_p
def to_unicode(s):
return s.encode('UTF-16LE')
def from_buffer_u(buffer):
i = 0
uchars = []
while True:
uchar = buffer.raw[i:i + 2].decode('UTF-16')
if uchar == u'\x00':
break
uchars.append(uchar)
i += 2
return ''.join(uchars)
# Exoteric case, don't really care.
elif UNICODE_SIZE < SQLWCHAR_SIZE:
raise OdbcLibraryError('Using narrow Python build with ODBC library '
'expecting wide unicode is not supported.')
# Below Datatype mappings referenced the document at
# http://infocenter.sybase.com/help/index.jsp?topic=/com.sybase.help.sdk_12.5.1.aseodbc/html/aseodbc/CACFDIGH.htm
SQL_data_type_dict = { \
#SQL Data TYPE 0.Python Data Type 1.Default Output Converter 2.Buffer Type 3.Buffer Allocator 4.Default Buffer Size
SQL_TYPE_NULL : (None, lambda x: None, SQL_C_CHAR, create_buffer, 2 ),
SQL_CHAR : (str, lambda x: x, SQL_C_CHAR, create_buffer, 2048 ),
SQL_NUMERIC : (Decimal, Decimal, SQL_C_CHAR, create_buffer, 150 ),
SQL_DECIMAL : (Decimal, Decimal, SQL_C_CHAR, create_buffer, 150 ),
SQL_INTEGER : (int, int, SQL_C_CHAR, create_buffer, 150 ),
SQL_SMALLINT : (int, int, SQL_C_CHAR, create_buffer, 150 ),
SQL_FLOAT : (float, float, SQL_C_CHAR, create_buffer, 150 ),
SQL_REAL : (float, float, SQL_C_CHAR, create_buffer, 150 ),
SQL_DOUBLE : (float, float, SQL_C_CHAR, create_buffer, 200 ),
SQL_DATE : (datetime.date, dt_cvt, SQL_C_CHAR , create_buffer, 30 ),
SQL_TIME : (datetime.time, tm_cvt, SQL_C_CHAR, create_buffer, 20 ),
SQL_SS_TIME2 : (datetime.time, tm_cvt, SQL_C_CHAR, create_buffer, 20 ),
SQL_TIMESTAMP : (datetime.datetime, dttm_cvt, SQL_C_CHAR, create_buffer, 30 ),
SQL_VARCHAR : (str, lambda x: x, SQL_C_CHAR, create_buffer, 2048 ),
SQL_LONGVARCHAR : (str, lambda x: x, SQL_C_CHAR, create_buffer, 20500 ),
SQL_BINARY : (bytearray, bytearray, SQL_C_BINARY, create_buffer, 5120 ),
SQL_VARBINARY : (bytearray, bytearray, SQL_C_BINARY, create_buffer, 5120 ),
SQL_LONGVARBINARY : (bytearray, bytearray, SQL_C_BINARY, create_buffer, 20500 ),
SQL_BIGINT : (long, long, SQL_C_CHAR, create_buffer, 150 ),
SQL_TINYINT : (int, int, SQL_C_CHAR, create_buffer, 150 ),
SQL_BIT : (bool, lambda x:x=='1', SQL_C_CHAR, create_buffer, 2 ),
SQL_WCHAR : (unicode, lambda x: x, SQL_C_WCHAR, create_buffer_u, 2048 ),
SQL_WVARCHAR : (unicode, lambda x: x, SQL_C_WCHAR, create_buffer_u, 2048 ),
SQL_GUID : (str, str, SQL_C_CHAR, create_buffer, 50 ),
SQL_WLONGVARCHAR : (unicode, lambda x: x, SQL_C_WCHAR, create_buffer_u, 20500 ),
SQL_TYPE_DATE : (datetime.date, dt_cvt, SQL_C_CHAR, create_buffer, 30 ),
SQL_TYPE_TIME : (datetime.time, tm_cvt, SQL_C_CHAR, create_buffer, 20 ),
SQL_TYPE_TIMESTAMP : (datetime.datetime, dttm_cvt, SQL_C_CHAR, create_buffer, 30 ),
}
"""
Types mapping, applicable for 32-bit and 64-bit Linux / Windows / Mac OS X.
SQLPointer -> ctypes.c_void_p
SQLCHAR * -> ctypes.c_char_p
SQLWCHAR * -> ctypes.c_wchar_p on Windows, ctypes.c_char_p with unixODBC
SQLINT -> ctypes.c_int
SQLSMALLINT -> ctypes.c_short
SQMUSMALLINT -> ctypes.c_ushort
SQLLEN -> ctypes.c_ssize_t
SQLULEN -> ctypes.c_size_t
SQLRETURN -> ctypes.c_short
"""
# Define the python return type for ODBC functions with ret result.
funcs_with_ret = [
"SQLAllocHandle",
"SQLBindParameter",
"SQLCloseCursor",
"SQLColAttribute",
"SQLColumns",
"SQLColumnsW",
"SQLConnect",
"SQLConnectW",
"SQLDataSources",
"SQLDataSourcesW",
"SQLDescribeCol",
"SQLDescribeColW",
"SQLDescribeParam",
"SQLDisconnect",
"SQLDriverConnect",
"SQLDriverConnectW",
"SQLEndTran",
"SQLExecDirect",
"SQLExecDirectW",
"SQLExecute",
"SQLFetch",
"SQLFetchScroll",
"SQLForeignKeys",
"SQLForeignKeysW",
"SQLFreeHandle",
"SQLFreeStmt",
"SQLGetData",
"SQLGetDiagRec",
"SQLGetInfo",
"SQLGetTypeInfo",
"SQLMoreResults",
"SQLNumParams",
"SQLNumResultCols",
"SQLPrepare",
"SQLPrepareW",
"SQLPrimaryKeys",
"SQLPrimaryKeysW",
"SQLProcedureColumns",
"SQLProcedureColumnsW",
"SQLProcedures",
"SQLProceduresW",
"SQLRowCount",
"SQLSetConnectAttr",
"SQLSetEnvAttr",
"SQLStatistics",
"SQLStatisticsW",
"SQLTables",
"SQLTablesW",
]
for func_name in funcs_with_ret:
getattr(ODBC_API, func_name).restype = ctypes.c_short
if sys.platform not in ('cli'):
#Seems like the IronPython can not declare ctypes.POINTER type arguments
ODBC_API.SQLAllocHandle.argtypes = [
ctypes.c_short,
ctypes.c_void_p,
ctypes.POINTER(ctypes.c_void_p),
]
ODBC_API.SQLBindParameter.argtypes = [
ctypes.c_void_p,
ctypes.c_ushort,
ctypes.c_short,
ctypes.c_short,
ctypes.c_short,
ctypes.c_size_t,
ctypes.c_short,
ctypes.c_void_p,
ctypes.c_ssize_t,
ctypes.POINTER(ctypes.c_ssize_t),
]
ODBC_API.SQLColAttribute.argtypes = [
ctypes.c_void_p,
ctypes.c_ushort,
ctypes.c_ushort,
ctypes.c_void_p,
ctypes.c_short,
ctypes.POINTER(ctypes.c_short),
ctypes.POINTER(ctypes.c_ssize_t),
]
ODBC_API.SQLDataSources.argtypes = [
ctypes.c_void_p,
ctypes.c_ushort,
ctypes.c_char_p,
ctypes.c_short,
ctypes.POINTER(ctypes.c_short),
ctypes.c_char_p,
ctypes.c_short,
ctypes.POINTER(ctypes.c_short),
]
ODBC_API.SQLDescribeCol.argtypes = [
ctypes.c_void_p,
ctypes.c_ushort,
ctypes.c_char_p,
ctypes.c_short,
ctypes.POINTER(ctypes.c_short),
ctypes.POINTER(ctypes.c_short),
ctypes.POINTER(ctypes.c_size_t),
ctypes.POINTER(ctypes.c_short),
ctypes.POINTER(ctypes.c_short),
]
ODBC_API.SQLDescribeParam.argtypes = [
ctypes.c_void_p,
ctypes.c_ushort,
ctypes.POINTER(ctypes.c_short),
ctypes.POINTER(ctypes.c_size_t),
ctypes.POINTER(ctypes.c_short),
ctypes.POINTER(ctypes.c_short),
]
ODBC_API.SQLDriverConnect.argtypes = [
ctypes.c_void_p,
ctypes.c_void_p,
ctypes.c_char_p,
ctypes.c_short,
ctypes.c_char_p,
ctypes.c_short,
ctypes.POINTER(ctypes.c_short),
ctypes.c_ushort,
]
ODBC_API.SQLGetData.argtypes = [
ctypes.c_void_p,
ctypes.c_ushort,
ctypes.c_short,
ctypes.c_void_p,
ctypes.c_ssize_t,
ctypes.POINTER(ctypes.c_ssize_t),
]
ODBC_API.SQLGetDiagRec.argtypes = [
ctypes.c_short,
ctypes.c_void_p,
ctypes.c_short,
ctypes.c_char_p,
ctypes.POINTER(ctypes.c_int),
ctypes.c_char_p,
ctypes.c_short,
ctypes.POINTER(ctypes.c_short),
]
ODBC_API.SQLGetInfo.argtypes = [
ctypes.c_void_p,
ctypes.c_ushort,
ctypes.c_void_p,
ctypes.c_short,
ctypes.POINTER(ctypes.c_short),
]
ODBC_API.SQLRowCount.argtypes = [
ctypes.c_void_p,
ctypes.POINTER(ctypes.c_ssize_t),
]
ODBC_API.SQLNumParams.argtypes = [
ctypes.c_void_p,
ctypes.POINTER(ctypes.c_short),
]
ODBC_API.SQLNumResultCols.argtypes = [
ctypes.c_void_p,
ctypes.POINTER(ctypes.c_short),
]
ODBC_API.SQLCloseCursor.argtypes = [ctypes.c_void_p]
ODBC_API.SQLColumns.argtypes = [
ctypes.c_void_p,
ctypes.c_char_p,
ctypes.c_short,
ctypes.c_char_p,
ctypes.c_short,
ctypes.c_char_p,
ctypes.c_short,
ctypes.c_char_p,
ctypes.c_short,
]
ODBC_API.SQLConnect.argtypes = [
ctypes.c_void_p,
ctypes.c_char_p,
ctypes.c_short,
ctypes.c_char_p,
ctypes.c_short,
ctypes.c_char_p,
ctypes.c_short,
]
ODBC_API.SQLDisconnect.argtypes = [ctypes.c_void_p]
ODBC_API.SQLEndTran.argtypes = [
ctypes.c_short,
ctypes.c_void_p,
ctypes.c_short,
]
ODBC_API.SQLExecute.argtypes = [ctypes.c_void_p]
ODBC_API.SQLExecDirect.argtypes = [
ctypes.c_void_p,
ctypes.c_char_p,
ctypes.c_int,
]
ODBC_API.SQLFetch.argtypes = [ctypes.c_void_p]
ODBC_API.SQLFetchScroll.argtypes = [
ctypes.c_void_p,
ctypes.c_short,
ctypes.c_ssize_t,
]
ODBC_API.SQLForeignKeys.argtypes = [
ctypes.c_void_p,
ctypes.c_char_p,
ctypes.c_short,
ctypes.c_char_p,
ctypes.c_short,
ctypes.c_char_p,
ctypes.c_short,
ctypes.c_char_p,
ctypes.c_short,
ctypes.c_char_p,
ctypes.c_short,
ctypes.c_char_p,
ctypes.c_short,
]
ODBC_API.SQLFreeHandle.argtypes = [
ctypes.c_short,
ctypes.c_void_p,
]
ODBC_API.SQLFreeStmt.argtypes = [
ctypes.c_void_p,
ctypes.c_ushort,
]
ODBC_API.SQLGetTypeInfo.argtypes = [
ctypes.c_void_p,
ctypes.c_short,
]
ODBC_API.SQLMoreResults.argtypes = [ctypes.c_void_p]
ODBC_API.SQLPrepare.argtypes = [
ctypes.c_void_p,
ctypes.c_char_p,
ctypes.c_int,
]
ODBC_API.SQLPrimaryKeys.argtypes = [
ctypes.c_void_p,
ctypes.c_char_p,
ctypes.c_short,
ctypes.c_char_p,
ctypes.c_short,
ctypes.c_char_p,
ctypes.c_short,
]
ODBC_API.SQLProcedureColumns.argtypes = [
ctypes.c_void_p,
ctypes.c_char_p,
ctypes.c_short,
ctypes.c_char_p,
ctypes.c_short,
ctypes.c_char_p,
ctypes.c_short,
ctypes.c_char_p,
ctypes.c_short,
]
ODBC_API.SQLProcedures.argtypes = [
ctypes.c_void_p,
ctypes.c_char_p,
ctypes.c_short,
ctypes.c_char_p,
ctypes.c_short,
ctypes.c_char_p,
ctypes.c_short,
]
ODBC_API.SQLSetConnectAttr.argtypes = [
ctypes.c_void_p,
ctypes.c_int,
ctypes.c_void_p,
ctypes.c_int,
]
ODBC_API.SQLSetEnvAttr.argtypes = [
ctypes.c_void_p,
ctypes.c_int,
ctypes.c_void_p,
ctypes.c_int,
]
ODBC_API.SQLStatistics.argtypes = [
ctypes.c_void_p,
ctypes.c_char_p,
ctypes.c_short,
ctypes.c_char_p,
ctypes.c_short,
ctypes.c_char_p,
ctypes.c_short,
ctypes.c_ushort,
ctypes.c_ushort,
]
ODBC_API.SQLTables.argtypes = [
ctypes.c_void_p,
ctypes.c_char_p,
ctypes.c_short,
ctypes.c_char_p,
ctypes.c_short,
ctypes.c_char_p,
ctypes.c_short,
ctypes.c_char_p,
ctypes.c_short,
]
def to_wchar(argtypes):
if argtypes: # Under IronPython some argtypes are not declared
result = []
for x in argtypes:
if x == ctypes.c_char_p:
result.append(wchar_type)
else:
result.append(x)
return result
else:
return argtypes
ODBC_API.SQLColumnsW.argtypes = to_wchar(ODBC_API.SQLColumns.argtypes)
ODBC_API.SQLConnectW.argtypes = to_wchar(ODBC_API.SQLConnect.argtypes)
ODBC_API.SQLDataSourcesW.argtypes = to_wchar(ODBC_API.SQLDataSources.argtypes)
ODBC_API.SQLDescribeColW.argtypes = to_wchar(ODBC_API.SQLDescribeCol.argtypes)
ODBC_API.SQLDriverConnectW.argtypes = to_wchar(ODBC_API.SQLDriverConnect.argtypes)
ODBC_API.SQLExecDirectW.argtypes = to_wchar(ODBC_API.SQLExecDirect.argtypes)
ODBC_API.SQLForeignKeysW.argtypes = to_wchar(ODBC_API.SQLForeignKeys.argtypes)
ODBC_API.SQLPrepareW.argtypes = to_wchar(ODBC_API.SQLPrepare.argtypes)
ODBC_API.SQLPrimaryKeysW.argtypes = to_wchar(ODBC_API.SQLPrimaryKeys.argtypes)
ODBC_API.SQLProcedureColumnsW.argtypes = to_wchar(ODBC_API.SQLProcedureColumns.argtypes)
ODBC_API.SQLProceduresW.argtypes = to_wchar(ODBC_API.SQLProcedures.argtypes)
ODBC_API.SQLStatisticsW.argtypes = to_wchar(ODBC_API.SQLStatistics.argtypes)
ODBC_API.SQLTablesW.argtypes = to_wchar(ODBC_API.SQLTables.argtypes)
# Set the alias for the ctypes functions for beter code readbility or performance.
ADDR = ctypes.byref
SQLFetch = ODBC_API.SQLFetch
SQLExecute = ODBC_API.SQLExecute
SQLBindParameter = ODBC_API.SQLBindParameter
def ctrl_err(ht, h, val_ret):
"""Classify type of ODBC error from (type of handle, handle, return value)
, and raise with a list"""
state = create_buffer(5)
NativeError = ctypes.c_int()
Message = create_buffer(1024*10)
Buffer_len = ctypes.c_short()
err_list = []
number_errors = 1
while 1:
ret = ODBC_API.SQLGetDiagRec(ht, h, number_errors, state, \
NativeError, Message, len(Message), ADDR(Buffer_len))
if ret == SQL_NO_DATA_FOUND:
#No more data, I can raise
if DEBUG: print err_list[0][1]
state = err_list[0][0]
err_text = '['+state+'] '+err_list[0][1]
if state[:2] in ('24','25','42'):
raise ProgrammingError(state,err_text)
elif state[:2] in ('22'):
raise DataError(state,err_text)
elif state[:2] in ('23') or state == '40002':
raise IntegrityError(state,err_text)
elif state == '0A000':
raise NotSupportedError(state,err_text)
elif state in ('HYT00','HYT01'):
raise OperationalError(state,err_text)
elif state[:2] in ('IM','HY'):
raise Error(state,err_text)
else:
raise DatabaseError(state,err_text)
break
elif ret == SQL_INVALID_HANDLE:
#The handle passed is an invalid handle
raise ProgrammingError('', 'SQL_INVALID_HANDLE')
elif ret == SQL_SUCCESS:
err_list.append((state.value, Message.value, NativeError.value))
number_errors += 1
def validate(ret, handle_type, handle):
""" Validate return value, if not success, raise exceptions based on the handle """
if ret not in (SQL_SUCCESS, SQL_SUCCESS_WITH_INFO, SQL_NO_DATA):
ctrl_err(handle_type, handle, ret)
def AllocateEnv():
if pooling:
ret = ODBC_API.SQLSetEnvAttr(SQL_NULL_HANDLE, SQL_ATTR_CONNECTION_POOLING, SQL_CP_ONE_PER_HENV, SQL_IS_UINTEGER)
validate(ret, SQL_HANDLE_ENV, SQL_NULL_HANDLE)
'''
Allocate an ODBC environment by initializing the handle shared_env_h
ODBC enviroment needed to be created, so connections can be created under it
connections pooling can be shared under one environment
'''
global shared_env_h
shared_env_h = ctypes.c_void_p()
ret = ODBC_API.SQLAllocHandle(SQL_HANDLE_ENV, SQL_NULL_HANDLE, ADDR(shared_env_h))
validate(ret, SQL_HANDLE_ENV, shared_env_h)
# Set the ODBC environment's compatibil leve to ODBC 3.0
ret = ODBC_API.SQLSetEnvAttr(shared_env_h, SQL_ATTR_ODBC_VERSION, SQL_OV_ODBC3, 0)
validate(ret, SQL_HANDLE_ENV, shared_env_h)
"""
Here, we have a few callables that determine how a result row is returned.
A new one can be added by creating a callable that:
- accepts a cursor as its parameter.
- returns a callable that accepts an iterable containing the row values.
"""
def TupleRow(cursor):
"""Normal tuple with added attribute `cursor_description`, as in pyodbc.
This is the default.
"""
class Row(tuple):
cursor_description = cursor.description
return Row
def NamedTupleRow(cursor):
"""Named tuple to allow attribute lookup by name.
Requires py2.6 or above.
"""
from collections import namedtuple
attr_names = [x[0] for x in cursor._ColBufferList]
class Row(namedtuple('Row', attr_names, rename=True)):
cursor_description = cursor.description
def __new__(cls, iterable):
return super(Row, cls).__new__(cls, *iterable)
return Row
def MutableNamedTupleRow(cursor):
"""Mutable named tuple to allow attribute to be replaced. This should be
compatible with pyodbc's Row type.
Requires 3rd-party library "recordtype".
"""
from recordtype import recordtype
attr_names = [x[0] for x in cursor._ColBufferList]
class Row(recordtype('Row', attr_names, rename=True)):
cursor_description = cursor.description
def __init__(self, iterable):
super(Row, self).__init__(*iterable)
def __iter__(self):
for field_name in self.__slots__:
yield getattr(self, field_name)
def __getitem__(self, index):
if isinstance(index, slice):
return tuple(getattr(self, x) for x in self.__slots__[index])
return getattr(self, self.__slots__[index])
def __setitem__(self, index, value):
setattr(self, self.__slots__[index], value)
return Row
# The get_type function is used to determine if parameters need to be re-binded
# against the changed parameter types
def get_type(v):
t = type(v)
if isinstance(v, str):
if len(v) >= 255:
t = 's'
elif isinstance(v, unicode):
if len(v) >= 255:
t = 'u'
elif isinstance(v, Decimal):
sv = str(v).replace('-','').strip('0').split('.')
if len(sv)>1:
t = (len(sv[0])+len(sv[1]),len(sv[1]))
else:
t = (len(sv[0]),0)
return t
# The Cursor Class.
class Cursor:
def __init__(self, conx, row_type_callable=None):
""" Initialize self._stmt_h, which is the handle of a statement
A statement is actually the basis of a python"cursor" object
"""
self._stmt_h = ctypes.c_void_p()
self.connection = conx
self.row_type_callable = row_type_callable or TupleRow
self.statement = None
self._last_param_types = None
self._ParamBufferList = []
self._ColBufferList = []
self._row_type = None
self._buf_cvt_func = []
self.rowcount = -1
self.description = None
self.autocommit = None
self._ColTypeCodeList = []
self._outputsize = {}
self._inputsizers = []
self.arraysize = 1
ret = ODBC_API.SQLAllocHandle(SQL_HANDLE_STMT, self.connection.dbc_h, ADDR(self._stmt_h))
validate(ret, SQL_HANDLE_STMT, self._stmt_h)
self.closed = False
def execute(self, query_string, params=None, many_mode=False, call_mode=False):
""" Execute the query string, with optional parameters.
If parameters are provided, the query would first be prepared, then executed with parameters;
If parameters are not provided, only th query sting, it would be executed directly
"""
self._free_results('FREE_STATEMENT')
if params:
# If parameters exist, first prepare the query then executed with parameters
if not type(params) in (tuple, list, set):
raise TypeError("Params must be in a list, tuple, or set")
if not many_mode:
if query_string != self.statement:
# if the query is not same as last query, then it is not prepared
self.prepare(query_string)
param_types = map(get_type, params)
if call_mode:
self._BindParams(param_types, self._pram_io_list)
else:
if param_types != self._last_param_types:
self._BindParams(param_types)
# With query prepared, now put parameters into buffers
col_num = 0
for param_buffer, param_buffer_len, sql_type in self._ParamBufferList:
c_char_buf, c_buf_len = '', 0
param_val = params[col_num]
if param_val is None:
c_buf_len = SQL_NULL_DATA
elif isinstance(param_val, datetime.datetime):
max_len = self.connection.type_size_dic[SQL_TYPE_TIMESTAMP][0]
datetime_str = param_val.strftime('%Y-%m-%d %H:%M:%S.%f')
c_char_buf = datetime_str[:max_len]
c_buf_len = len(c_char_buf)
# print c_buf_len, c_char_buf
elif isinstance(param_val, datetime.date):
if self.connection.type_size_dic.has_key(SQL_TYPE_DATE):
max_len = self.connection.type_size_dic[SQL_TYPE_DATE][0]
else:
max_len = 10
c_char_buf = param_val.isoformat()[:max_len]
c_buf_len = len(c_char_buf)
#print c_char_buf
elif isinstance(param_val, datetime.time):
if self.connection.type_size_dic.has_key(SQL_TYPE_TIME):
max_len = self.connection.type_size_dic[SQL_TYPE_TIME][0]
c_char_buf = param_val.isoformat()[:max_len]
c_buf_len = len(c_char_buf)
elif self.connection.type_size_dic.has_key(SQL_SS_TIME2):
max_len = self.connection.type_size_dic[SQL_SS_TIME2][0]
c_char_buf = param_val.isoformat()[:max_len]
c_buf_len = len(c_char_buf)
else:
c_buf_len = self.connection.type_size_dic[SQL_TYPE_TIMESTAMP][0]
time_str = param_val.isoformat()
if len(time_str) == 8:
time_str += '.000'
c_char_buf = '1900-01-01 '+time_str[0:c_buf_len - 11]
#print c_buf_len, c_char_buf
elif isinstance(param_val, bool):
if param_val == True:
c_char_buf = '1'
else:
c_char_buf = '0'
c_buf_len = 1
elif isinstance(param_val, (int, long, float, Decimal)):
c_char_buf = str(param_val)
c_buf_len = len(c_char_buf)
elif isinstance(param_val, str):
c_char_buf = param_val
c_buf_len = len(c_char_buf)
elif isinstance(param_val, unicode):
c_char_buf = to_unicode(param_val)
c_buf_len = len(c_char_buf)
elif isinstance(param_val, (bytearray, buffer)):
c_char_buf = str(param_val)
c_buf_len = len(c_char_buf)
else:
c_char_buf = param_val
if isinstance(param_val, (bytearray, buffer)):
param_buffer.raw = c_char_buf
else:
param_buffer.value = c_char_buf
#print param_buffer, param_buffer.value
if isinstance(param_val, (unicode, str)):
#ODBC driver will find NUL in unicode and string to determine their length
param_buffer_len.value = SQL_NTS
else:
param_buffer_len.value = c_buf_len
col_num += 1
ret = SQLExecute(self._stmt_h)
if ret != SQL_SUCCESS:
validate(ret, SQL_HANDLE_STMT, self._stmt_h)
if not many_mode:
self._NumOfRows()
self._UpdateDesc()
#self._BindCols()
else:
self.execdirect(query_string)
return (self)
def _SQLExecute(self):
ret = SQLExecute(self._stmt_h)
if ret != SQL_SUCCESS:
validate(ret, SQL_HANDLE_STMT, self._stmt_h)
def prepare(self, query_string):
"""prepare a query"""
if type(query_string) == unicode:
c_query_string = wchar_type(to_unicode(query_string))
ret = ODBC_API.SQLPrepareW(self._stmt_h, c_query_string, len(query_string))
else:
c_query_string = ctypes.c_char_p(query_string)
ret = ODBC_API.SQLPrepare(self._stmt_h, c_query_string, len(query_string))
if ret != SQL_SUCCESS:
validate(ret, SQL_HANDLE_STMT, self._stmt_h)
self.statement = query_string
def execdirect(self, query_string):
"""Execute a query directly"""
if type(query_string) == unicode:
c_query_string = wchar_type(to_unicode(query_string))
ret = ODBC_API.SQLExecDirectW(self._stmt_h, c_query_string, len(query_string))
else:
c_query_string = ctypes.c_char_p(query_string)
ret = ODBC_API.SQLExecDirect(self._stmt_h, c_query_string, len(query_string))
validate(ret, SQL_HANDLE_STMT, self._stmt_h)
self._NumOfRows()
self._UpdateDesc()
#self._BindCols()
self.statement = None
return (self)
def callproc(self, procname, args):
raise Warning('', 'Still not fully implemented')
self._pram_io_list = [row[4] for row in self.procedurecolumns(procedure = procname).fetchall() if row[4] not in (SQL_RESULT_COL, SQL_RETURN_VALUE)]
print 'pram_io_list: '+str(self._pram_io_list)
call_escape = '{CALL '+procname
if args:
call_escape += '(' + ','.join(['?' for params in args]) + ')'
call_escape += '}'
self.execute(call_escape, args, call_mode = True)
result = []
for buf, buf_len, sql_type in self._ParamBufferList:
if buf_len.value == -1:
result.append(None)
else:
result.append(self.connection.output_converter[sql_type](buf.value))
return (result)
def executemany(self, query_string, params_list = [None]):
self.prepare(query_string)
for params in params_list:
self.execute(query_string, params, many_mode = True)
self._NumOfRows()
self.rowcount = -1
self._UpdateDesc()
#self._BindCols()
def _BindParams(self, param_types, pram_io_list = []):
"""Create parameter buffers based on param types, and bind them to the statement"""
# Get the number of query parameters judged by database.
NumParams = ctypes.c_short()
ret = ODBC_API.SQLNumParams(self._stmt_h, ADDR(NumParams))
if ret != SQL_SUCCESS:
validate(ret, SQL_HANDLE_STMT, self._stmt_h)
if len(param_types) != NumParams.value:
# In case number of parameters provided do not same as number required
error_desc = "The SQL contains %d parameter markers, but %d parameters were supplied" \
%(NumParams.value,len(param_types))
raise ProgrammingError('HY000',error_desc)
# Every parameter needs to be binded to a buffer
ParamBufferList = []
# Temporary holder since we can only call SQLDescribeParam before
# calling SQLBindParam.
temp_holder = []
for col_num in range(NumParams.value):
col_size = 0
buf_size = 512
if param_types[col_num] == type(None):
ParameterNumber = ctypes.c_ushort(col_num + 1)
DataType = ctypes.c_short()
ParameterSize = ctypes.c_size_t()
DecimalDigits = ctypes.c_short()
Nullable = ctypes.c_short()
ret = ODBC_API.SQLDescribeParam(
self._stmt_h,
ParameterNumber,
ADDR(DataType),
ADDR(ParameterSize),
ADDR(DecimalDigits),
ADDR(Nullable),
)
if ret != SQL_SUCCESS:
validate(ret, SQL_HANDLE_STMT, self._stmt_h)
sql_c_type = SQL_C_DEFAULT
sql_type = DataType.value
buf_size = 1
ParameterBuffer = create_buffer(buf_size)
elif param_types[col_num] == 'u':
sql_c_type = SQL_C_WCHAR
sql_type = SQL_WLONGVARCHAR
buf_size = len(self._inputsizers)>col_num and self._inputsizers[col_num] or 20500
ParameterBuffer = create_buffer_u(buf_size)
elif param_types[col_num] == 's':
sql_c_type = SQL_C_CHAR
sql_type = SQL_LONGVARCHAR
buf_size = len(self._inputsizers)>col_num and self._inputsizers[col_num] or 20500
ParameterBuffer = create_buffer(buf_size)
elif type(param_types[col_num]) == tuple: #Decimal
sql_c_type = SQL_C_CHAR
sql_type = SQL_NUMERIC
buf_size = param_types[col_num][0]
ParameterBuffer = create_buffer(buf_size+4)
col_size = param_types[col_num][1]
if DEBUG: print param_types[col_num][0],param_types[col_num][1]
# bool subclasses int, thus has to go first
elif issubclass(param_types[col_num], bool):
sql_c_type = SQL_C_CHAR
sql_type = SQL_BIT
buf_size = SQL_data_type_dict[sql_type][4]
ParameterBuffer = create_buffer(buf_size)
elif issubclass(param_types[col_num], int):
sql_c_type = SQL_C_CHAR
sql_type = SQL_INTEGER
buf_size = SQL_data_type_dict[sql_type][4]
ParameterBuffer = create_buffer(buf_size)
elif issubclass(param_types[col_num], long):
sql_c_type = SQL_C_CHAR
sql_type = SQL_BIGINT
buf_size = SQL_data_type_dict[sql_type][4]
ParameterBuffer = create_buffer(buf_size)
elif issubclass(param_types[col_num], float):
sql_c_type = SQL_C_CHAR
sql_type = SQL_DOUBLE
buf_size = SQL_data_type_dict[sql_type][4]
ParameterBuffer = create_buffer(buf_size)
# datetime subclasses date, thus has to go first
elif issubclass(param_types[col_num], datetime.datetime):
sql_c_type = SQL_C_CHAR
sql_type = SQL_TYPE_TIMESTAMP
buf_size = self.connection.type_size_dic[SQL_TYPE_TIMESTAMP][0]
ParameterBuffer = create_buffer(buf_size)
col_size = self.connection.type_size_dic[SQL_TYPE_TIMESTAMP][1]
elif issubclass(param_types[col_num], datetime.date):
sql_c_type = SQL_C_CHAR
if self.connection.type_size_dic.has_key(SQL_TYPE_DATE):
if DEBUG: print 'conx.type_size_dic.has_key(SQL_TYPE_DATE)'
sql_type = SQL_TYPE_DATE
buf_size = self.connection.type_size_dic[SQL_TYPE_DATE][0]
ParameterBuffer = create_buffer(buf_size)
col_size = self.connection.type_size_dic[SQL_TYPE_DATE][1]
else:
# SQL Sever <2008 doesn't have a DATE type.
sql_type = SQL_TYPE_TIMESTAMP
buf_size = 10
ParameterBuffer = create_buffer(buf_size)
elif issubclass(param_types[col_num], datetime.time):
sql_c_type = SQL_C_CHAR
if self.connection.type_size_dic.has_key(SQL_TYPE_TIME):
sql_type = SQL_TYPE_TIME
buf_size = self.connection.type_size_dic[SQL_TYPE_TIME][0]
ParameterBuffer = create_buffer(buf_size)
col_size = self.connection.type_size_dic[SQL_TYPE_TIME][1]
elif self.connection.type_size_dic.has_key(SQL_SS_TIME2):
# TIME type added in SQL Server 2008
sql_type = SQL_SS_TIME2
buf_size = self.connection.type_size_dic[SQL_SS_TIME2][0]
ParameterBuffer = create_buffer(buf_size)
col_size = self.connection.type_size_dic[SQL_SS_TIME2][1]
else:
# SQL Sever <2008 doesn't have a TIME type.
sql_type = SQL_TYPE_TIMESTAMP
buf_size = self.connection.type_size_dic[SQL_TYPE_TIMESTAMP][0]
ParameterBuffer = create_buffer(buf_size)
col_size = 3
elif issubclass(param_types[col_num], unicode):
sql_c_type = SQL_C_WCHAR
sql_type = SQL_WVARCHAR
buf_size = 255
ParameterBuffer = create_buffer_u(buf_size)
elif issubclass(param_types[col_num], str):
sql_c_type = SQL_C_CHAR
sql_type = SQL_VARCHAR
buf_size = 255
ParameterBuffer = create_buffer(buf_size)
elif issubclass(param_types[col_num], (bytearray, buffer)):
sql_c_type = SQL_C_BINARY
sql_type = SQL_LONGVARBINARY
buf_size = len(self._inputsizers)>col_num and self._inputsizers[col_num] or 20500
ParameterBuffer = create_buffer(buf_size)
else:
sql_c_type = SQL_C_CHAR
sql_type = SQL_LONGVARCHAR
buf_size = len(self._inputsizers)>col_num and self._inputsizers[col_num] or 20500
ParameterBuffer = create_buffer(buf_size)
temp_holder.append((sql_c_type, sql_type, buf_size, col_size, ParameterBuffer))
for col_num, (sql_c_type, sql_type, buf_size, col_size, ParameterBuffer) in enumerate(temp_holder):
BufferLen = ctypes.c_ssize_t(buf_size)
LenOrIndBuf = ctypes.c_ssize_t()
InputOutputType = SQL_PARAM_INPUT
if len(pram_io_list) > col_num:
InputOutputType = pram_io_list[col_num]
ret = SQLBindParameter(self._stmt_h, col_num + 1, InputOutputType, sql_c_type, sql_type, buf_size,\
col_size, ADDR(ParameterBuffer), BufferLen,ADDR(LenOrIndBuf))
if ret != SQL_SUCCESS:
validate(ret, SQL_HANDLE_STMT, self._stmt_h)
# Append the value buffer and the lenth buffer to the array
ParamBufferList.append((ParameterBuffer,LenOrIndBuf,sql_type))
self._last_param_types = param_types
self._ParamBufferList = ParamBufferList
def _CreateColBuf(self):
NOC = self._NumOfCols()
self._ColBufferList = []
self._row_type = None
for col_num in range(NOC):
col_name = self.description[col_num][0]
col_sql_data_type = self._ColTypeCodeList[col_num]
# set default size base on the column's sql data type
total_buf_len = SQL_data_type_dict[col_sql_data_type][4]
# over-write if there's preset size value for "large columns"
if total_buf_len >= 20500:
total_buf_len = self._outputsize.get(None,total_buf_len)
# over-write if there's preset size value for the "col_num" column
total_buf_len = self._outputsize.get(col_num, total_buf_len)
alloc_buffer = SQL_data_type_dict[col_sql_data_type][3](total_buf_len)
used_buf_len = ctypes.c_ssize_t()
target_type = SQL_data_type_dict[col_sql_data_type][2]
force_unicode = self.connection.unicode_results
if force_unicode and col_sql_data_type in (SQL_CHAR,SQL_VARCHAR,SQL_LONGVARCHAR):
target_type = SQL_C_WCHAR
alloc_buffer = create_buffer_u(total_buf_len)
buf_cvt_func = self.connection.output_converter[self._ColTypeCodeList[col_num]]
self._ColBufferList.append([col_name, target_type, used_buf_len, alloc_buffer, total_buf_len, buf_cvt_func])
def _GetData(self):
'''Bind buffers for the record set columns'''
# Lazily create the row type on first fetch.
if self._row_type is None:
self._row_type = self.row_type_callable(self)
value_list = []
col_num = 0
for col_name, target_type, used_buf_len, alloc_buffer, total_buf_len, buf_cvt_func in self._ColBufferList:
blocks = []
while True:
ret = ODBC_API.SQLGetData(self._stmt_h, col_num + 1, target_type, ADDR(alloc_buffer), total_buf_len,\
ADDR(used_buf_len))
validate(ret, SQL_HANDLE_STMT, self._stmt_h)
if ret == SQL_SUCCESS:
if used_buf_len.value == SQL_NULL_DATA:
blocks.append(None)
else:
if target_type == SQL_C_BINARY:
blocks.append(alloc_buffer.raw[:used_buf_len.value])
elif target_type == SQL_C_WCHAR:
blocks.append(from_buffer_u(alloc_buffer))
else:
#print col_name, target_type, alloc_buffer.value
blocks.append(alloc_buffer.value)
break
if ret == SQL_SUCCESS_WITH_INFO:
if target_type == SQL_C_BINARY:
blocks.append(alloc_buffer.raw)
else:
blocks.append(alloc_buffer.value)
if ret == SQL_NO_DATA:
break
if len(blocks) == 1:
raw_value = blocks[0]
else:
raw_value = ''.join(blocks)
if raw_value == None:
value_list.append(None)
else:
value_list.append(buf_cvt_func(raw_value))
col_num += 1
return self._row_type(value_list)
def _UpdateDesc(self):
"Get the information of (name, type_code, display_size, internal_size, col_precision, scale, null_ok)"
Cname = create_buffer(1024)
Cname_ptr = ctypes.c_short()
Ctype_code = ctypes.c_short()
Csize = ctypes.c_size_t()
Cdisp_size = ctypes.c_ssize_t(0)
CDecimalDigits = ctypes.c_short()
Cnull_ok = ctypes.c_short()
ColDescr = []
self._ColTypeCodeList = []
NOC = self._NumOfCols()
for col in range(1, NOC+1):
ret = ODBC_API.SQLColAttribute(self._stmt_h, col, SQL_DESC_DISPLAY_SIZE, ADDR(create_buffer(10)),
10, ADDR(ctypes.c_short()),ADDR(Cdisp_size))
validate(ret, SQL_HANDLE_STMT, self._stmt_h)
ret = ODBC_API.SQLDescribeCol(self._stmt_h, col, Cname, len(Cname), ADDR(Cname_ptr),\
ADDR(Ctype_code),ADDR(Csize),ADDR(CDecimalDigits), ADDR(Cnull_ok))
validate(ret, SQL_HANDLE_STMT, self._stmt_h)
col_name = Cname.value
if lowercase:
col_name = str.lower(col_name)
#(name, type_code, display_size,
# internal_size, col_precision, scale, null_ok)
ColDescr.append((col_name, SQL_data_type_dict.get(Ctype_code.value,(Ctype_code.value))[0],Cdisp_size.value,\
Csize.value, Csize.value,CDecimalDigits.value,Cnull_ok.value == 1 and True or False))
self._ColTypeCodeList.append(Ctype_code.value)
if len(ColDescr) > 0:
self.description = ColDescr
else:
self.description = None
self._CreateColBuf()
def _NumOfRows(self):
"""Get the number of rows"""
NOR = ctypes.c_ssize_t()
ret = ODBC_API.SQLRowCount(self._stmt_h, ADDR(NOR))
validate(ret, SQL_HANDLE_STMT, self._stmt_h)
self.rowcount = NOR.value
return self.rowcount
def _NumOfCols(self):
"""Get the number of cols"""
NOC = ctypes.c_short()
ret = ODBC_API.SQLNumResultCols(self._stmt_h, ADDR(NOC))
validate(ret, SQL_HANDLE_STMT, self._stmt_h)
return NOC.value
def fetchall(self):
rows = []
while True:
row = self.fetchone()
if row == None:
break
rows.append(row)
return rows
def fetchmany(self, num = None):
if num == None:
num = self.arraysize
rows, row_num = [], 0
while row_num < num:
row = self.fetchone()
if row == None:
break
rows.append(row)
row_num += 1
return rows
def fetchone(self):
ret = SQLFetch(self._stmt_h)
if ret == SQL_SUCCESS:
return self._GetData()
else:
if ret == SQL_NO_DATA_FOUND:
return None
else:
validate(ret, SQL_HANDLE_STMT, self._stmt_h)
def next(self):
row = self.fetchone()
if row == None:
raise(StopIteration)
return row
def __iter__(self):
return self
def skip(self, count = 0):
for i in xrange(count):
ret = ODBC_API.SQLFetchScroll(self._stmt_h, SQL_FETCH_NEXT, 0)
if ret != SQL_SUCCESS:
validate(ret, SQL_HANDLE_STMT, self._stmt_h)
return None
def nextset(self):
ret = ODBC_API.SQLMoreResults(self._stmt_h)
if ret not in (SQL_SUCCESS, SQL_NO_DATA):
validate(ret, SQL_HANDLE_STMT, self._stmt_h)
if ret == SQL_NO_DATA:
self._free_results('FREE_STATEMENT')
return False
else:
self._NumOfRows()
self._UpdateDesc()
#self._BindCols()
return True
def _free_results(self, free_statement):
if not self.connection.connected:
raise ProgrammingError('HY000','Attempt to use a closed connection.')
self.description = None
if free_statement == 'FREE_STATEMENT':
ret = ODBC_API.SQLFreeStmt(self._stmt_h, SQL_CLOSE)
validate(ret, SQL_HANDLE_STMT, self._stmt_h)
else:
ret = ODBC_API.SQLFreeStmt(self._stmt_h, SQL_UNBIND)
validate(ret, SQL_HANDLE_STMT, self._stmt_h)
ret = ODBC_API.SQLFreeStmt(self._stmt_h, SQL_RESET_PARAMS)
validate(ret, SQL_HANDLE_STMT, self._stmt_h)
self.rowcount = -1
def getTypeInfo(self, sqlType = None):
if sqlType == None:
type = SQL_ALL_TYPES
else:
type = sqlType
ret = ODBC_API.SQLGetTypeInfo(self._stmt_h, type)
if ret in (SQL_SUCCESS, SQL_SUCCESS_WITH_INFO):
self._NumOfRows()
self._UpdateDesc()
#self._BindCols()
return self.fetchone()
def tables(self, table=None, catalog=None, schema=None, tableType=None):
"""Return a list with all tables"""
l_catalog = l_schema = l_table = l_tableType = 0
if catalog != None:
l_catalog = len(catalog)
catalog = ctypes.c_char_p(catalog)
if schema != None:
l_schema = len(schema)
schema = ctypes.c_char_p(schema)
if table != None:
l_table = len(table)
table = ctypes.c_char_p(table)
if tableType != None:
l_tableType = len(tableType)
tableType = ctypes.c_char_p(tableType)
self._free_results('FREE_STATEMENT')
self.statement = None
ret = ODBC_API.SQLTables(self._stmt_h,
catalog, l_catalog,
schema, l_schema,
table, l_table,
tableType, l_tableType)
validate(ret, SQL_HANDLE_STMT, self._stmt_h)
self._NumOfRows()
self._UpdateDesc()
#self._BindCols()
return (self)
def columns(self, table=None, catalog=None, schema=None, column=None):
"""Return a list with all columns"""
l_catalog = l_schema = l_table = l_column = 0
if catalog != None:
l_catalog = len(catalog)
catalog = ctypes.c_char_p(catalog)
if schema != None:
l_schema = len(schema)
schema = ctypes.c_char_p(schema)
if table != None:
l_table = len(table)
table = ctypes.c_char_p(table)
if column != None:
l_column = len(column)
column = ctypes.c_char_p(column)
self._free_results('FREE_STATEMENT')
self.statement = None
ret = ODBC_API.SQLColumns(self._stmt_h,
catalog, l_catalog,
schema, l_schema,
table, l_table,
column, l_column)
validate(ret, SQL_HANDLE_STMT, self._stmt_h)
self._NumOfRows()
self._UpdateDesc()
#self._BindCols()
return (self)
def primaryKeys(self, table=None, catalog=None, schema=None):
l_catalog = l_schema = l_table = 0
if catalog != None:
l_catalog = len(catalog)
catalog = ctypes.c_char_p(catalog)
if schema != None:
l_schema = len(schema)
schema = ctypes.c_char_p(schema)
if table != None:
l_table = len(table)
table = ctypes.c_char_p(table)
self._free_results('FREE_STATEMENT')
self.statement = None
ret = ODBC_API.SQLPrimaryKeys(self._stmt_h,
catalog, l_catalog,
schema, l_schema,
table, l_table)
validate(ret, SQL_HANDLE_STMT, self._stmt_h)
self._NumOfRows()
self._UpdateDesc()
#self._BindCols()
return (self)
def foreignKeys(self, table=None, catalog=None, schema=None, foreignTable=None, foreignCatalog=None, foreignSchema=None):
l_catalog = l_schema = l_table = l_foreignTable = l_foreignCatalog = l_foreignSchema = 0
if catalog != None:
l_catalog = len(catalog)
catalog = ctypes.c_char_p(catalog)
if schema != None:
l_schema = len(schema)
schema = ctypes.c_char_p(schema)
if table != None:
l_table = len(table)
table = ctypes.c_char_p(table)
if foreignTable != None:
l_foreignTable = len(foreignTable)
foreignTable = ctypes.c_char_p(foreignTable)
if foreignCatalog != None:
l_foreignCatalog = len(foreignCatalog)
foreignCatalog = ctypes.c_char_p(foreignCatalog)
if foreignSchema != None:
l_foreignSchema = len(foreignSchema)
foreignSchema = ctypes.c_char_p(foreignSchema)
self._free_results('FREE_STATEMENT')
self.statement = None
ret = ODBC_API.SQLForeignKeys(self._stmt_h,
catalog, l_catalog,
schema, l_schema,
table, l_table,
foreignCatalog, l_foreignCatalog,
foreignSchema, l_foreignSchema,
foreignTable, l_foreignTable)
validate(ret, SQL_HANDLE_STMT, self._stmt_h)
self._NumOfRows()
self._UpdateDesc()
#self._BindCols()
return (self)
def procedurecolumns(self, procedure=None, catalog=None, schema=None, column=None):
l_catalog = l_schema = l_procedure = l_column = 0
if catalog != None:
l_catalog = len(catalog)
catalog = ctypes.c_char_p(catalog)
if schema != None:
l_schema = len(schema)
schema = ctypes.c_char_p(schema)
if procedure != None:
l_procedure = len(procedure)
procedure = ctypes.c_char_p(procedure)
if column != None:
l_column = len(column)
column = ctypes.c_char_p(column)
self._free_results('FREE_STATEMENT')
self.statement = None
ret = ODBC_API.SQLProcedureColumns(self._stmt_h,
catalog, l_catalog,
schema, l_schema,
procedure, l_procedure,
column, l_column)
validate(ret, SQL_HANDLE_STMT, self._stmt_h)
self._NumOfRows()
self._UpdateDesc()
return (self)
def procedures(self, procedure=None, catalog=None, schema=None):
l_catalog = l_schema = l_procedure = 0
if catalog != None:
l_catalog = len(catalog)
catalog = ctypes.c_char_p(catalog)
if schema != None:
l_schema = len(schema)
schema = ctypes.c_char_p(schema)
if procedure != None:
l_procedure = len(procedure)
procedure = ctypes.c_char_p(procedure)
self._free_results('FREE_STATEMENT')
self.statement = None
ret = ODBC_API.SQLProcedures(self._stmt_h,
catalog, l_catalog,
schema, l_schema,
procedure, l_procedure)
validate(ret, SQL_HANDLE_STMT, self._stmt_h)
self._NumOfRows()
self._UpdateDesc()
return (self)
def statistics(self, table, catalog=None, schema=None, unique=False, quick=True):
l_table = l_catalog = l_schema = 0
if catalog != None:
l_catalog = len(catalog)
catalog = ctypes.c_char_p(catalog)
if schema != None:
l_schema = len(schema)
schema = ctypes.c_char_p(schema)
if table != None:
l_table = len(table)
table = ctypes.c_char_p(table)
if unique:
Unique = SQL_INDEX_UNIQUE
else:
Unique = SQL_INDEX_ALL
if quick:
Reserved = SQL_QUICK
else:
Reserved = SQL_ENSURE
self._free_results('FREE_STATEMENT')
self.statement = None
ret = ODBC_API.SQLStatistics(self._stmt_h,
catalog, l_catalog,
schema, l_schema,
table, l_table,
Unique, Reserved)
validate(ret, SQL_HANDLE_STMT, self._stmt_h)
self._NumOfRows()
self._UpdateDesc()
#self._BindCols()
return (self)
def commit(self):
self.connection.commit()
def rollback(self):
self.connection.rollback()
def setoutputsize(self, size, column = None):
self._outputsize[column] = size
def setinputsizes(self, sizes):
self._inputsizers = [size for size in sizes]
def close(self):
""" Call SQLCloseCursor API to free the statement handle"""
# ret = ODBC_API.SQLCloseCursor(self._stmt_h)
# validate(ret, SQL_HANDLE_STMT, self._stmt_h)
#
ret = ODBC_API.SQLFreeStmt(self._stmt_h, SQL_CLOSE)
validate(ret, SQL_HANDLE_STMT, self._stmt_h)
ret = ODBC_API.SQLFreeStmt(self._stmt_h, SQL_UNBIND)
validate(ret, SQL_HANDLE_STMT, self._stmt_h)
ret = ODBC_API.SQLFreeStmt(self._stmt_h, SQL_RESET_PARAMS)
validate(ret, SQL_HANDLE_STMT, self._stmt_h)
ret = ODBC_API.SQLFreeHandle(SQL_HANDLE_STMT, self._stmt_h)
validate(ret, SQL_HANDLE_STMT, self._stmt_h)
self.closed = True
def __del__(self):
if not self.closed:
if DEBUG: print 'auto closing cursor: ',
try:
self.close()
except:
if DEBUG: print 'failed'
pass
else:
if DEBUG: print 'succeed'
pass
def __exit__(self, type, value, traceback):
if value:
self.rollback()
else:
self.commit()
self.close()
def __enter__(self):
return self
# This class implement a odbc connection.
#
#
class Connection:
def __init__(self, connectString = '', autocommit = False, ansi = False, timeout = 0, unicode_results = False, readonly = False, **kargs):
"""Init variables and connect to the engine"""
self.connected = 0
self.type_size_dic = {}
self.unicode_results = False
self.dbc_h = ctypes.c_void_p()
self.autocommit = autocommit
self.readonly = False
self.timeout = 0
for key, value in kargs.items():
connectString = connectString + key + '=' + value + ';'
self.connectString = connectString
self.clear_output_converters()
try:
lock.acquire()
if shared_env_h == None:
#Initialize an enviroment if it is not created.
AllocateEnv()
finally:
lock.release()
# Allocate an DBC handle self.dbc_h under the environment shared_env_h
# This DBC handle is actually the basis of a "connection"
# The handle of self.dbc_h will be used to connect to a certain source
# in the self.connect and self.ConnectByDSN method
ret = ODBC_API.SQLAllocHandle(SQL_HANDLE_DBC, shared_env_h, ADDR(self.dbc_h))
validate(ret, SQL_HANDLE_DBC, self.dbc_h)
self.connect(connectString, autocommit, ansi, timeout, unicode_results, readonly)
def connect(self, connectString = '', autocommit = False, ansi = False, timeout = 0, unicode_results = False, readonly = False):
"""Connect to odbc, using connect strings and set the connection's attributes like autocommit and timeout
by calling SQLSetConnectAttr
"""
# Before we establish the connection by the connection string
# Set the connection's attribute of "timeout" (Actully LOGIN_TIMEOUT)
if timeout != 0:
ret = ODBC_API.SQLSetConnectAttr(self.dbc_h, SQL_ATTR_LOGIN_TIMEOUT, timeout, SQL_IS_UINTEGER);
validate(ret, SQL_HANDLE_DBC, self.dbc_h)
# Create one connection with a connect string by calling SQLDriverConnect
# and make self.dbc_h the handle of this connection
# Convert the connetsytring to encoded string
# so it can be converted to a ctypes c_char array object
if not ansi:
c_connectString = wchar_type(to_unicode(self.connectString))
odbc_func = ODBC_API.SQLDriverConnectW
else:
c_connectString = ctypes.c_char_p(self.connectString)
odbc_func = ODBC_API.SQLDriverConnect
# With unixODBC, SQLDriverConnect will intermittently fail with error:
# [01000] [unixODBC][Driver Manager]Can't open lib '/path/to/so' : file not found"
# or:
# [01000] [unixODBC][Driver Manager]Can't open lib '/path/to/so' : (null)"
# when called concurrently by more than one threads. So, we have to
# use a lock to serialize the calls. By the way, the error is much
# less likely to happen if ODBC Tracing is enabled, likely due to the
# implicit serialization caused by writing to trace file.
if ODBC_API._name != 'odbc32':
try:
lock.acquire()
ret = odbc_func(self.dbc_h, 0, c_connectString, len(self.connectString), None, 0, None, SQL_DRIVER_NOPROMPT)
finally:
lock.release()
else:
ret = odbc_func(self.dbc_h, 0, c_connectString, len(self.connectString), None, 0, None, SQL_DRIVER_NOPROMPT)
validate(ret, SQL_HANDLE_DBC, self.dbc_h)
# Set the connection's attribute of "autocommit"
#
self.autocommit = autocommit
if self.autocommit == True:
ret = ODBC_API.SQLSetConnectAttr(self.dbc_h, SQL_ATTR_AUTOCOMMIT, SQL_AUTOCOMMIT_ON, SQL_IS_UINTEGER)
else:
ret = ODBC_API.SQLSetConnectAttr(self.dbc_h, SQL_ATTR_AUTOCOMMIT, SQL_AUTOCOMMIT_OFF, SQL_IS_UINTEGER)
validate(ret, SQL_HANDLE_DBC, self.dbc_h)
# Set the connection's attribute of "readonly"
#
self.readonly = readonly
ret = ODBC_API.SQLSetConnectAttr(self.dbc_h, SQL_ATTR_ACCESS_MODE, self.readonly and SQL_MODE_READ_ONLY or SQL_MODE_READ_WRITE, SQL_IS_UINTEGER)
validate(ret, SQL_HANDLE_DBC, self.dbc_h)
self.unicode_results = unicode_results
self.update_type_size_info()
self.connected = 1
def clear_output_converters(self):
self.output_converter = {}
for sqltype, profile in SQL_data_type_dict.items():
self.output_converter[sqltype] = profile[1]
def add_output_converter(self, sqltype, func):
self.output_converter[sqltype] = func
def settimeout(self, timeout):
ret = ODBC_API.SQLSetConnectAttr(self.dbc_h, SQL_ATTR_CONNECTION_TIMEOUT, timeout, SQL_IS_UINTEGER);
validate(ret, SQL_HANDLE_DBC, self.dbc_h)
self.timeout = timeout
def ConnectByDSN(self, dsn, user, passwd = ''):
"""Connect to odbc, we need dsn, user and optionally password"""
self.dsn = dsn
self.user = user
self.passwd = passwd
sn = create_buffer(dsn)
un = create_buffer(user)
pw = create_buffer(passwd)
ret = ODBC_API.SQLConnect(self.dbc_h, sn, len(sn), un, len(un), pw, len(pw))
validate(ret, SQL_HANDLE_DBC, self.dbc_h)
self.update_type_size_info()
self.connected = 1
def cursor(self, row_type_callable=None):
#self.settimeout(self.timeout)
if not self.connected:
raise ProgrammingError('HY000','Attempt to use a closed connection.')
return Cursor(self, row_type_callable=row_type_callable)
def update_type_size_info(self):
for sql_type in (
SQL_TYPE_TIMESTAMP,
SQL_TYPE_DATE,
SQL_TYPE_TIME,
SQL_SS_TIME2,
):
cur = Cursor(self)
info_tuple = cur.getTypeInfo(sql_type)
if info_tuple != None:
self.type_size_dic[sql_type] = info_tuple[2], info_tuple[14]
cur.close()
def commit(self):
if not self.connected:
raise ProgrammingError('HY000','Attempt to use a closed connection.')
ret = ODBC_API.SQLEndTran(SQL_HANDLE_DBC, self.dbc_h, SQL_COMMIT);
validate(ret, SQL_HANDLE_DBC, self.dbc_h)
def rollback(self):
if not self.connected:
raise ProgrammingError('HY000','Attempt to use a closed connection.')
ret = ODBC_API.SQLEndTran(SQL_HANDLE_DBC, self.dbc_h, SQL_ROLLBACK);
validate(ret, SQL_HANDLE_DBC, self.dbc_h)
def getinfo(self,infotype):
if infotype not in aInfoTypes.keys():
raise ProgrammingError('HY000','Invalid getinfo value: '+str(infotype))
if aInfoTypes[infotype] == 'GI_UINTEGER':
total_buf_len = 1000
alloc_buffer = ctypes.c_ulong()
used_buf_len = ctypes.c_short()
ret = ODBC_API.SQLGetInfo(self.dbc_h,infotype,ADDR(alloc_buffer), total_buf_len,\
ADDR(used_buf_len))
validate(ret, SQL_HANDLE_DBC, self.dbc_h)
result = alloc_buffer.value
elif aInfoTypes[infotype] == 'GI_USMALLINT':
total_buf_len = 1000
alloc_buffer = ctypes.c_ushort()
used_buf_len = ctypes.c_short()
ret = ODBC_API.SQLGetInfo(self.dbc_h,infotype,ADDR(alloc_buffer), total_buf_len,\
ADDR(used_buf_len))
validate(ret, SQL_HANDLE_DBC, self.dbc_h)
result = alloc_buffer.value
else:
total_buf_len = 1000
alloc_buffer = create_buffer(total_buf_len)
used_buf_len = ctypes.c_short()
ret = ODBC_API.SQLGetInfo(self.dbc_h,infotype,ADDR(alloc_buffer), total_buf_len,\
ADDR(used_buf_len))
validate(ret, SQL_HANDLE_DBC, self.dbc_h)
result = alloc_buffer.value
if aInfoTypes[infotype] == 'GI_YESNO':
if result[0] == 'Y':
result = True
else:
result = False
return result
def __exit__(self, type, value, traceback):
if value:
self.rollback()
else:
self.commit()
if self.connected:
self.close()
def __enter__(self):
return self
def __del__(self):
if self.connected:
self.close()
def close(self):
if not self.connected:
raise ProgrammingError('HY000','Attempt to close a closed connection.')
if self.connected:
if DEBUG: print 'disconnect'
if not self.autocommit:
self.rollback()
ret = ODBC_API.SQLDisconnect(self.dbc_h)
validate(ret, SQL_HANDLE_DBC, self.dbc_h)
if DEBUG: print 'free dbc'
ret = ODBC_API.SQLFreeHandle(SQL_HANDLE_DBC, self.dbc_h)
validate(ret, SQL_HANDLE_DBC, self.dbc_h)
# if shared_env_h.value:
# if DEBUG: print 'env'
# ret = ODBC_API.SQLFreeHandle(SQL_HANDLE_ENV, shared_env_h)
# validate(ret, SQL_HANDLE_ENV, shared_env_h)
self.connected = 0
odbc = Connection
connect = odbc
'''
def connect(connectString = '', autocommit = False, ansi = False, timeout = 0, unicode_results = False, readonly = False, **kargs):
return odbc(connectString, autocommit, ansi, timeout, unicode_results, readonly, kargs)
'''
def win_create_mdb(mdb_path, sort_order = "General\0\0"):
if sys.platform not in ('win32','cli'):
raise Exception('This function is available for use in Windows only.')
#CREATE_DB=<path name> <sort order>
ctypes.windll.ODBCCP32.SQLConfigDataSource.argtypes = [ctypes.c_void_p,ctypes.c_ushort,ctypes.c_char_p,ctypes.c_char_p]
c_Path = "CREATE_DB=" + mdb_path + " " + sort_order
ODBC_ADD_SYS_DSN = 1
ret = ctypes.windll.ODBCCP32.SQLConfigDataSource(None,ODBC_ADD_SYS_DSN,"Microsoft Access Driver (*.mdb)", c_Path)
if not ret:
raise Exception('Failed to create Access mdb file. Please check file path, permission and Access driver readiness.')
def win_compact_mdb(mdb_path, compacted_mdb_path, sort_order = "General\0\0"):
if sys.platform not in ('win32','cli'):
raise Exception('This function is available for use in Windows only.')
#COMPACT_DB=<source path> <destination path> <sort order>
c_Path = "COMPACT_DB=" + mdb_path + " " + compacted_mdb_path + " " + sort_order
ODBC_ADD_SYS_DSN = 1
ctypes.windll.ODBCCP32.SQLConfigDataSource.argtypes = [ctypes.c_void_p,ctypes.c_ushort,ctypes.c_char_p,ctypes.c_char_p]
ret = ctypes.windll.ODBCCP32.SQLConfigDataSource(None,ODBC_ADD_SYS_DSN,"Microsoft Access Driver (*.mdb)", c_Path)
if not ret:
raise Exception('Failed to compact Access mdb file. Please check file path, permission and Access driver readiness.')
def dataSources():
"""Return a list with [name, descrition]"""
dsn = create_buffer(1024)
desc = create_buffer(1024)
dsn_len = ctypes.c_short()
desc_len = ctypes.c_short()
dsn_list = {}
try:
lock.acquire()
if shared_env_h == None:
AllocateEnv()
finally:
lock.release()
while 1:
ret = ODBC_API.SQLDataSources(shared_env_h, SQL_FETCH_NEXT, \
dsn, len(dsn), ADDR(dsn_len), desc, len(desc), ADDR(desc_len))
if ret == SQL_NO_DATA_FOUND:
break
elif not ret in (SQL_SUCCESS, SQL_SUCCESS_WITH_INFO):
ctrl_err(SQL_HANDLE_ENV, shared_env_h, ret)
else:
dsn_list[dsn.value] = desc.value
return dsn_list
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