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# MySQL Connector/Python - MySQL driver written in Python.
# Copyright (c) 2016, Oracle and/or its affiliates. All rights reserved.
# MySQL Connector/Python is licensed under the terms of the GPLv2
# <http://www.gnu.org/licenses/old-licenses/gpl-2.0.html>, like most
# MySQL Connectors. There are special exceptions to the terms and
# conditions of the GPLv2 as it is applied to this software, see the
# FOSS License Exception
# <http://www.mysql.com/about/legal/licensing/foss-exception.html>.
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
"""Implementation of the Result Set classes."""
import decimal
import struct
import sys
from datetime import datetime, timedelta
from .dbdoc import DbDoc
from .charsets import MYSQL_CHARACTER_SETS
from .compat import STRING_TYPES
def decode_from_bytes(value, encoding="utf-8"):
return value.decode(encoding) if isinstance(value, bytes) else value
def from_protobuf(col_type, payload):
if len(payload) == 0:
return None
try:
return {
ColumnProtoType.SINT: varsint_from_protobuf,
ColumnProtoType.UINT: varint_from_protobuf,
ColumnProtoType.BYTES: bytes_from_protobuf,
ColumnProtoType.DATETIME: datetime_from_protobuf,
ColumnProtoType.TIME: time_from_protobuf,
ColumnProtoType.FLOAT: float_from_protobuf,
ColumnProtoType.DOUBLE: double_from_protobuf,
ColumnProtoType.BIT: varint_from_protobuf,
ColumnProtoType.SET: set_from_protobuf,
ColumnProtoType.ENUM: bytes_from_protobuf,
ColumnProtoType.DECIMAL: decimal_from_protobuf,
}[col_type](payload)
except KeyError as e:
sys.stderr.write("{0}".format(e))
sys.stderr.write("{0}".format(payload.encode("hex")))
return None
def bytes_from_protobuf(payload):
# Strip trailing char
return payload[:-1]
def float_from_protobuf(payload):
assert len(payload) == 4
return struct.unpack("<f", payload)
def double_from_protobuf(payload):
assert len(payload) == 8
return struct.unpack("<d", payload)
def varint_from_protobuf_stream(payload):
if len(payload) == 0:
raise ValueError("Payload is empty")
cur = 0
i = 0
shift = 0
for c in payload:
ch = c if isinstance(c, int) else ord(c)
eos = (ch & 0x80) == 0
cur_bits = (ch & 0x7f)
cur_bits <<= shift
i |= cur_bits
if eos:
return i, payload[cur + 1:]
cur += 1
shift += 7
raise EOFError("Payload too short")
def varint_from_protobuf(payload):
i, payload = varint_from_protobuf_stream(payload)
if len(payload) != 0:
raise ValueError("Payload too long")
return i
def varsint_from_protobuf(payload):
i, payload = varint_from_protobuf_stream(payload)
if len(payload) != 0:
raise ValueError("Payload too long")
# Zigzag encoded, revert it
if i & 0x1:
i = ~i
i = (i >> 1)
i |= 1 << 63
else:
i = (i >> 1)
return i
def set_from_protobuf(payload):
s = []
while True:
try:
field_len, payload = varint_from_protobuf_stream(payload)
if len(payload) < field_len:
if len(payload) == 0 and field_len == 1 and len(s) == 0:
# Special case for empty set
return []
raise ValueError("Invalid Set encoding")
s.append(payload[:field_len])
payload = payload[field_len:]
if len(payload) == 0:
# Done
break
except ValueError:
break
return s
def decimal_from_protobuf(payload):
digits = []
sign = None
scale = ord(payload[0])
payload = payload[1:]
for c in payload:
ch = ord(c)
high_bcd = (ch & 0xf0) >> 4
low_bcd = ch & 0x0f
if high_bcd < 0x0a:
digits.append(high_bcd)
if low_bcd < 0x0a:
digits.append(low_bcd)
elif low_bcd == 0x0c:
sign = 0
break
elif low_bcd == 0x0d:
sign = 1
break
else:
raise ValueError("Invalid BCD")
elif high_bcd == 0x0c:
sign = 0
assert low_bcd == 0x00
break
elif high_bcd == 0x0d:
sign = 1
assert low_bcd == 0x00
break
else:
raise ValueError("Invalid BCD: {0}".format(high_bcd))
return decimal.Decimal((sign, digits, -scale))
def datetime_from_protobuf(payload):
# A sequence of varints
hour = 0
minutes = 0
seconds = 0
useconds = 0
year, payload = varint_from_protobuf_stream(payload)
month, payload = varint_from_protobuf_stream(payload)
day, payload = varint_from_protobuf_stream(payload)
try:
hour, payload = varint_from_protobuf_stream(payload)
minutes, payload = varint_from_protobuf_stream(payload)
seconds, payload = varint_from_protobuf_stream(payload)
useconds, payload = varint_from_protobuf_stream(payload)
except ValueError:
pass
return datetime(year, month, day, hour, minutes, seconds, useconds)
def time_from_protobuf(payload):
# A sequence of varints
hour = 0
minutes = 0
seconds = 0
useconds = 0
negate = payload[0] == 1
payload = payload[1:]
try:
hour, payload = varint_from_protobuf_stream(payload)
minutes, payload = varint_from_protobuf_stream(payload)
seconds, payload = varint_from_protobuf_stream(payload)
useconds, payload = varint_from_protobuf_stream(payload)
except ValueError:
pass
if negate:
# Negate the first non-zero value
if hour:
hour *= -1
elif minutes:
minutes *= -1
elif seconds:
seconds *= -1
elif useconds:
useconds *= -1
return timedelta(hours=hour, minutes=minutes, seconds=seconds,
microseconds=useconds)
class Collations(object):
UTF8_GENERAL_CI = 33
class ColumnType(object):
BIT = 1
TINYINT = 2
SMALLINT = 3
MEDIUMINT = 4
INT = 5
BIGINT = 6
REAL = 7
FLOAT = 8
DECIMAL = 9
NUMERIC = 10
DOUBLE = 11
JSON = 12
STRING = 13
BYTES = 14
TIME = 15
DATE = 16
DATETIME = 17
TIMESTAMP = 18
SET = 19
ENUM = 20
GEOMETRY = 21
XML = 22
YEAR = 23
CHAR = 24
VARCHAR = 25
BINARY = 26
VARBINARY = 27
TINYBLOB = 28
BLOB = 29
MEDIUMBLOB = 30
LONGBLOB = 31
TINYTEXT = 32
TEXT = 33
MEDIUMTEXT = 34
LONGTEXT = 35
@classmethod
def to_string(cls, needle):
for key, value in vars(cls).items():
if value == needle:
return key
@classmethod
def from_string(cls, key):
return getattr(cls, key.upper(), None)
@classmethod
def is_char(cls, col_type):
return col_type in (cls.CHAR, cls.VARCHAR,)
@classmethod
def is_binary(cls, col_type):
return col_type in (cls.BINARY, cls.VARBINARY,)
@classmethod
def is_text(cls, col_type):
return col_type in (cls.TEXT, cls.TINYTEXT, cls.MEDIUMTEXT,
cls.LONGTEXT,)
@classmethod
def is_decimals(cls, col_type):
return col_type in (cls.REAL, cls.DOUBLE, cls.FLOAT, cls.DECIMAL,
cls.NUMERIC,)
@classmethod
def is_numeric(cls, col_type):
return col_type in (cls.BIT, cls.TINYINT, cls.SMALLINT, cls.MEDIUMINT,
cls.INT, cls.BIGINT,)
@classmethod
def is_finite_set(cls, col_type):
return col_type in (cls.SET, cls.ENUM,)
class ColumnProtoType(object):
SINT = 1
UINT = 2
DOUBLE = 5
FLOAT = 6
BYTES = 7
TIME = 10
DATETIME = 12
SET = 15
ENUM = 16
BIT = 17
DECIMAL = 18
class Flags(object):
def __init__(self, value):
self._allowed_flags = {}
self._flag_names = {}
for k, v in self.__class__.__dict__.items():
if k.startswith("__"):
continue
if type(v) in (int, ):
self._allowed_flags[k] = v
self._flag_names[v] = k
self.value = value
def __str__(self):
mask = 1
flag_names = []
value = self.value
for _ in range(0, 63):
mask <<= 1
flag = value & mask
if flag:
# We matched something, find the name for it
try:
flag_names.append(self._flag_names[flag])
except KeyError:
sys.stderr.write("{0}".format(self._flag_names))
sys.stderr.write("{0}".format(self.__class__.__dict__))
return ",".join(flag_names)
@property
def value(self):
return self._value
@value.setter
def value(self, v):
self._value = v
class ColumnFlags(Flags):
NOT_NULL = 0x0010
PRIMARY_KEY = 0x0020
UNIQUE_KEY = 0x0040
MULTIPLE_KEY = 0x0080
AUTO_INCREMENT = 0x0100
class DatetimeColumnFlags(ColumnFlags):
TIMESTAMP = 0x0001
class UIntColumnFlags(ColumnFlags):
ZEROFILL = 0x0001
class DoubleColumnFlags(ColumnFlags):
UNSIGNED = 0x0001
class FloatColumnFlags(ColumnFlags):
UNSIGNED = 0x0001
class BytesColumnFlags(ColumnFlags):
RIGHT_PAD = 0x0001
class BytesContentType(ColumnFlags):
GEOMETRY = 0x0001
JSON = 0x0002
XML = 0x0003
class ColumnMetaData(object):
def __init__(self, col_type, catalog=None, schema=None, table=None,
original_table=None, name=None, original_name=None,
length=None, collation=None, fractional_digits=None,
flags=None, content_type=None):
self._schema = decode_from_bytes(schema)
self._name = decode_from_bytes(name)
self._original_name = decode_from_bytes(original_name)
self._table = decode_from_bytes(table)
self._original_table = decode_from_bytes(original_table)
self._proto_type = col_type
self._col_type = None
self._catalog = catalog
self._length = length
self._collation = collation
self._fractional_digits = fractional_digits
self._flags = flags
self._content_type = content_type
self._number_signed = False
self._is_padded = False
self._is_binary = False
self._is_bytes = False
self._collation_name = None
self._character_set_name = None
if self._collation > 0:
if self._collation >= len(MYSQL_CHARACTER_SETS):
raise ValueError("No mapping found for collation {0}"
"".format(self._collation))
info = MYSQL_CHARACTER_SETS[self._collation]
self._character_set_name = info[0]
self._collation_name = info[1]
self._is_binary = ("binary" in self._collation_name or
"_bin" in self._collation_name)
self._map_type()
self._is_bytes = self._col_type in (
ColumnType.GEOMETRY, ColumnType.JSON, ColumnType.XML,
ColumnType.BYTES, ColumnType.STRING)
def __str__(self):
return str({
"col_type": self._col_type,
"schema": self._schema,
"table": self._table,
"flags": str(self._flags),
})
def get_schema_name(self):
return self._schema
def get_table_name(self):
return self._original_table or self._table
def get_table_label(self):
return self._table or self._original_table
def get_column_name(self):
return self._original_name or self._name
def get_column_label(self):
return self._name or self._original_name
def get_type(self):
return self._col_type
def get_length(self):
return self._length
def get_fractional_digits(self):
return self._fractional_digits
def get_collation_name(self):
return self._collation_name
def get_character_set_name(self):
return self._character_set_name
def is_number_signed(self):
return self._number_signed
def is_padded(self):
return self._is_padded
def is_bytes(self):
return self._is_bytes
def _map_int_type(self):
if self._length <= 4:
self._col_type = ColumnType.TINYINT
elif self._length <= 6:
self._col_type = ColumnType.SMALLINT
elif self._length <= 9:
self._col_type = ColumnType.MEDIUMINT
elif self._length <= 11:
self._col_type = ColumnType.INT
else:
self._col_type = ColumnType.BIGINT
self._number_signed = True
def _map_uint_type(self):
if self._length <= 3:
self._col_type = ColumnType.TINYINT
elif self._length <= 5:
self._col_type = ColumnType.SMALLINT
elif self._length <= 8:
self._col_type = ColumnType.MEDIUMINT
elif self._length <= 10:
self._col_type = ColumnType.INT
else:
self._col_type = ColumnType.BIGINT
self._zero_fill = self._flags & 1
def _map_bytes(self):
if self._content_type == BytesContentType.GEOMETRY:
self._col_type = ColumnType.GEOMETRY
elif self._content_type == BytesContentType.JSON:
self._col_type = ColumnType.JSON
elif self._content_type == BytesContentType.XML:
self._col_type = ColumnType.XML
elif self._is_binary:
self._col_type = ColumnType.BYTES
else:
self._col_type = ColumnType.STRING
self._is_padded = self._flags & 1
def _map_datetime(self):
if self._length == 10:
self._col_type = ColumnType.DATE
elif self._length == 19:
self._col_type = ColumnType.DATETIME
elif self._flags & DatetimeColumnFlags.TIMESTAMP > 0:
self._col_type = ColumnType.TIMESTAMP
else:
raise ValueError("Datetime mapping scenario unhandled")
def _map_type(self):
if self._proto_type == ColumnProtoType.SINT:
self._map_int_type()
elif self._proto_type == ColumnProtoType.UINT:
self._map_uint_type()
elif self._proto_type == ColumnProtoType.FLOAT:
self._col_type = ColumnType.FLOAT
self._is_number_signed = \
(self._flags & FloatColumnFlags.UNSIGNED) == 0
elif self._proto_type == ColumnProtoType.DECIMAL:
self._col_type = ColumnType.DECIMAL
self._is_number_signed = \
(self._flags & FloatColumnFlags.UNSIGNED) == 0
elif self._proto_type == ColumnProtoType.DOUBLE:
self._col_type = ColumnType.DOUBLE
self._is_number_signed = \
(self._flags & FloatColumnFlags.UNSIGNED) == 0
elif self._proto_type == ColumnProtoType.BYTES:
self._map_bytes()
elif self._proto_type == ColumnProtoType.TIME:
self._col_type = ColumnType.TIME
elif self._proto_type == ColumnProtoType.DATETIME:
self._map_datetime()
elif self._proto_type == ColumnProtoType.SET:
self._col_type = ColumnType.SET
elif self._proto_type == ColumnProtoType.ENUM:
self._col_type = ColumnType.ENUM
elif self._proto_type == ColumnProtoType.BIT:
self._col_type = ColumnType.BIT
else:
raise ValueError("Unknown column type {0}".format(self._proto_type))
class Warning(object):
def __init__(self, level, code, msg):
self._level = level
self._code = code
self._message = msg
@property
def Level(self):
return self._level
@property
def Code(self):
return self._code
@property
def Message(self):
return self._message
class Row(object):
"""Represents a row element returned from a SELECT query.
Args:
rs (mysqlx.Result): The Result set.
fields (list): The list of fields.
"""
def __init__(self, rs, fields):
self._fields = fields
self._resultset = rs
def __getitem__(self, index):
if isinstance(index, STRING_TYPES):
index = self._resultset.index_of(index)
elif index >= len(self._fields):
raise IndexError("Index out of range")
return self._fields[index]
def get_string(self, str_index):
"""Returns the value if the index by string.
Args:
str_index (str): The string index.
"""
int_index = self._resultset.index_of(str_index)
if int_index >= len(self._fields):
raise IndexError("Argument out of range")
if int_index == -1:
raise ValueError("Column name '{0}' not found".format(str_index))
return str(self._fields[int_index])
class BaseResult(object):
"""Provides base functionality for result objects.
Args:
connection (mysqlx.connection.Connection): The Connection object.
"""
def __init__(self, connection):
self._connection = connection
self._closed = False
self._rows_affected = 0
self._generated_id = -1
self._warnings = []
if connection is None:
self._protocol = None
else:
self._protocol = connection.protocol
connection.fetch_active_result()
def get_warnings(self):
"""Returns the warnings.
Returns:
list: The list of warnings.
"""
return self._warnings
def get_warnings_count(self):
"""Returns the number of warnings.
Returns:
int: The number of warnings.
"""
return len(self._warnings)
class Result(BaseResult):
"""Allows retrieving information about non query operations performed on
the database.
Args:
connection (mysqlx.connection.Connection): The Connection object.
ids (list): A list of IDs.
"""
def __init__(self, connection=None, ids=None):
super(Result, self).__init__(connection)
self._ids = ids
if connection is not None:
self._connection.close_result(self)
def get_affected_items_count(self):
"""Returns the number of affected items for the last operation.
Returns:
int: The number of affected items.
"""
return self._rows_affected
def get_autoincrement_value(self):
"""Returns the last insert id auto generated.
Returns:
int: The last insert id.
"""
return self._generated_id
def get_document_id(self):
"""Returns ID of the last document inserted into a collection.
"""
if self._ids is None:
return None
if len(self._ids) == 0:
return None
return self._ids[0]
def get_document_ids(self):
"""Returns the list of generated documents IDs.
"""
return self._ids
class BufferingResult(BaseResult):
def __init__(self, connection):
super(BufferingResult, self).__init__(connection)
self._init_result()
def _init_result(self):
self._columns = self._connection.get_column_metadata(self)
self._has_more_data = True if len(self._columns) > 0 else False
self._items = []
self._page_size = 20
self._position = -1
self._connection._active_result = self if self._has_more_data else None
@property
def count(self):
"""int: The total of items.
"""
return len(self._items)
def __getitem__(self, index):
return self._items[index]
def index_of(self, col_name):
"""Returns the index of the column.
Returns:
int: The index of the column.
"""
index = 0
for col in self._columns:
if col.get_column_name() == col_name:
return index
index = index + 1
return -1
def _read_item(self, dumping):
row = self._connection.read_row(self)
if row is None:
return None
item = [None] * len(row.field)
if not dumping:
for x in range(len(row.field)):
col = self._columns[x]
value = (decode_from_bytes(row.field[x])
if col.is_bytes() else row.field[x])
item[x] = from_protobuf(col._proto_type, value)
return Row(self, item)
def _page_in_items(self):
if self._closed:
return False
count = 0
for i in range(self._page_size):
item = self._read_item(False)
if item is None:
break
self._items.append(item)
count += 1
return count
def fetch_one(self):
""" Fetch one item.
Returns:
Row/DbDoc: one result item.
"""
if self._closed:
return None
return self._read_item(False)
def fetch_all(self):
"""Fetch all items.
Returns:
list: The list of items.
"""
while True:
if not self._page_in_items():
break
return self._items
class RowResult(BufferingResult):
"""Allows traversing the Row objects returned by a Table.select operation.
Args:
connection (mysqlx.connection.Connection): The Connection object.
"""
def __init__(self, connection):
super(RowResult, self).__init__(connection)
@property
def columns(self):
"""list: The list of columns.
"""
return self._columns
class SqlResult(RowResult):
"""Represents a result from a SQL statement.
Args:
connection (mysqlx.connection.Connection): The Connection object.
"""
def __init__(self, connection):
super(SqlResult, self).__init__(connection)
self._has_more_results = False
def get_autoincrement_value(self):
"""Returns the identifier for the last record inserted.
"""
return self._generated_id
def next_result(self):
if self._closed:
return False
self._has_more_results = False
self._init_result()
return True
class DocResult(BufferingResult):
"""Allows traversing the DbDoc objects returned by a Collection.find
operation.
Args:
connection (mysqlx.connection.Connection): The Connection object.
"""
def __init__(self, connection):
super(DocResult, self).__init__(connection)
def _read_item(self, dumping):
row = super(DocResult, self)._read_item(dumping)
if row is None:
return None
return DbDoc(decode_from_bytes(row[0]))
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