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import re
import datetime
import time
import sys
from constants import FIELD_TYPE, FLAG
from charset import charset_by_id
PYTHON3 = sys.version_info[0] > 2
try:
set
except NameError:
try:
from sets import BaseSet as set
except ImportError:
from sets import Set as set
ESCAPE_REGEX = re.compile(r"[\0\n\r\032\'\"\\]")
ESCAPE_MAP = {'\0': '\\0', '\n': '\\n', '\r': '\\r', '\032': '\\Z',
'\'': '\\\'', '"': '\\"', '\\': '\\\\'}
def escape_item(val, charset):
encoder = encoders[type(val)]
return encoder(val, charset)
def escape_dict(val, charset):
n = {}
for k, v in val.items():
quoted = escape_item(v, charset)
n[k] = quoted
return n
def escape_sequence(val, charset):
n = []
for item in val:
quoted = escape_item(item, charset)
n.append(quoted)
return b"(" + b",".join(n) + b")"
def escape_set(val, charset):
val = map(lambda x: escape_item(x, charset), val)
return b','.join(val)
def escape_bool(value, charset):
return str(int(value)).encode(charset)
def escape_via_str(value, charset):
return str(value).encode(charset)
escape_int = escape_long = escape_via_str
def escape_float(value, charset):
return escape_string('%.15g' % value, charset)
def escape_bytes(value, charset):
return escape_string(value.decode('latin-1'), 'latin-1') # latin-1 is a 1:1 mapping from chars to bytes
def escape_string(value, charset):
ret = ("'%s'" % ESCAPE_REGEX.sub(
lambda match: ESCAPE_MAP.get(match.group(0)), value))
return ret.encode(charset)
escape_unicode = escape_string
def escape_None(value):
return b'NULL'
def escape_timedelta(obj, charset):
seconds = int(obj.seconds) % 60
minutes = int(obj.seconds // 60) % 60
hours = int(obj.seconds // 3600) % 24 + int(obj.days) * 24
return escape_string('%02d:%02d:%02d' % (hours, minutes, seconds), charset)
def escape_time(obj, charset):
s = "%02d:%02d:%02d" % (int(obj.hour), int(obj.minute),
int(obj.second))
if obj.microsecond:
s += ".%f" % obj.microsecond
return escape_string(s, charset)
def escape_datetime(obj, charset):
return escape_string(obj.strftime("%Y-%m-%d %H:%M:%S"), charset)
def escape_date(obj, charset):
return escape_string(obj.strftime("%Y-%m-%d"), charset)
def escape_struct_time(obj, charset):
return escape_datetime(datetime.datetime(*obj[:6]), charset)
def convert_datetime(connection, field, obj):
"""Returns a DATETIME or TIMESTAMP column value as a datetime object:
>>> datetime_or_None('2007-02-25 23:06:20')
datetime.datetime(2007, 2, 25, 23, 6, 20)
>>> datetime_or_None('2007-02-25T23:06:20')
datetime.datetime(2007, 2, 25, 23, 6, 20)
Illegal values are returned as None:
>>> datetime_or_None('2007-02-31T23:06:20') is None
True
>>> datetime_or_None('0000-00-00 00:00:00') is None
True
"""
if not isinstance(obj, unicode):
obj = obj.decode(connection.charset)
if ' ' in obj:
sep = ' '
elif 'T' in obj:
sep = 'T'
else:
return convert_date(connection, field, obj)
try:
ymd, hms = obj.split(sep, 1)
return datetime.datetime(*[ int(x) for x in ymd.split('-')+hms.split(':') ])
except ValueError:
return convert_date(connection, field, obj)
def convert_timedelta(connection, field, obj):
"""Returns a TIME column as a timedelta object:
>>> timedelta_or_None('25:06:17')
datetime.timedelta(1, 3977)
>>> timedelta_or_None('-25:06:17')
datetime.timedelta(-2, 83177)
Illegal values are returned as None:
>>> timedelta_or_None('random crap') is None
True
Note that MySQL always returns TIME columns as (+|-)HH:MM:SS, but
can accept values as (+|-)DD HH:MM:SS. The latter format will not
be parsed correctly by this function.
"""
try:
microseconds = 0
if not isinstance(obj, unicode):
obj = obj.decode(connection.charset)
if "." in obj:
(obj, tail) = obj.split('.')
microseconds = int(tail)
hours, minutes, seconds = obj.split(':')
tdelta = datetime.timedelta(
hours = int(hours),
minutes = int(minutes),
seconds = int(seconds),
microseconds = microseconds
)
return tdelta
except ValueError:
return None
def convert_time(connection, field, obj):
"""Returns a TIME column as a time object:
>>> time_or_None('15:06:17')
datetime.time(15, 6, 17)
Illegal values are returned as None:
>>> time_or_None('-25:06:17') is None
True
>>> time_or_None('random crap') is None
True
Note that MySQL always returns TIME columns as (+|-)HH:MM:SS, but
can accept values as (+|-)DD HH:MM:SS. The latter format will not
be parsed correctly by this function.
Also note that MySQL's TIME column corresponds more closely to
Python's timedelta and not time. However if you want TIME columns
to be treated as time-of-day and not a time offset, then you can
use set this function as the converter for FIELD_TYPE.TIME.
"""
try:
microseconds = 0
if "." in obj:
(obj, tail) = obj.split('.')
microseconds = int(tail)
hours, minutes, seconds = obj.split(':')
return datetime.time(hour=int(hours), minute=int(minutes),
second=int(seconds), microsecond=microseconds)
except ValueError:
return None
def convert_date(connection, field, obj):
"""Returns a DATE column as a date object:
>>> date_or_None('2007-02-26')
datetime.date(2007, 2, 26)
Illegal values are returned as None:
>>> date_or_None('2007-02-31') is None
True
>>> date_or_None('0000-00-00') is None
True
"""
try:
if not isinstance(obj, unicode):
obj = obj.decode(connection.charset)
return datetime.date(*[ int(x) for x in obj.split('-', 2) ])
except ValueError:
return None
def convert_mysql_timestamp(connection, field, timestamp):
"""Convert a MySQL TIMESTAMP to a Timestamp object.
MySQL >= 4.1 returns TIMESTAMP in the same format as DATETIME:
>>> mysql_timestamp_converter('2007-02-25 22:32:17')
datetime.datetime(2007, 2, 25, 22, 32, 17)
MySQL < 4.1 uses a big string of numbers:
>>> mysql_timestamp_converter('20070225223217')
datetime.datetime(2007, 2, 25, 22, 32, 17)
Illegal values are returned as None:
>>> mysql_timestamp_converter('2007-02-31 22:32:17') is None
True
>>> mysql_timestamp_converter('00000000000000') is None
True
"""
if not isinstance(timestamp, unicode):
timestamp = timestamp.decode(connection.charset)
if timestamp[4] == '-':
return convert_datetime(connection, field, timestamp)
timestamp += "0"*(14-len(timestamp)) # padding
year, month, day, hour, minute, second = \
int(timestamp[:4]), int(timestamp[4:6]), int(timestamp[6:8]), \
int(timestamp[8:10]), int(timestamp[10:12]), int(timestamp[12:14])
try:
return datetime.datetime(year, month, day, hour, minute, second)
except ValueError:
return None
def convert_set(s):
return set(s.split(","))
def convert_bit(connection, field, b):
#b = "\x00" * (8 - len(b)) + b # pad w/ zeroes
#return struct.unpack(">Q", b)[0]
#
# the snippet above is right, but MySQLdb doesn't process bits,
# so we shouldn't either
return b
def convert_characters(connection, field, data):
field_charset = charset_by_id(field.charsetnr).name
if field.flags & FLAG.SET:
return convert_set(data.decode(field_charset))
if field.flags & FLAG.BINARY:
return data
if connection.use_unicode:
data = data.decode(field_charset)
elif connection.charset != field_charset:
data = data.decode(field_charset)
data = data.encode(connection.charset)
return data
def convert_int(connection, field, data):
return int(data)
def convert_long(connection, field, data):
return long(data)
def convert_float(connection, field, data):
return float(data)
encoders = {
bool: escape_bool,
int: escape_int,
long: escape_long,
float: escape_float,
bytes: escape_bytes,
str: escape_string,
unicode: escape_unicode,
tuple: escape_sequence,
list:escape_sequence,
set:escape_sequence,
dict:escape_dict,
type(None):escape_None,
datetime.date: escape_date,
datetime.datetime : escape_datetime,
datetime.timedelta : escape_timedelta,
datetime.time : escape_time,
time.struct_time : escape_struct_time,
}
decoders = {
FIELD_TYPE.BIT: convert_bit,
FIELD_TYPE.TINY: convert_int,
FIELD_TYPE.SHORT: convert_int,
FIELD_TYPE.LONG: convert_long,
FIELD_TYPE.FLOAT: convert_float,
FIELD_TYPE.DOUBLE: convert_float,
FIELD_TYPE.DECIMAL: convert_float,
FIELD_TYPE.NEWDECIMAL: convert_float,
FIELD_TYPE.LONGLONG: convert_long,
FIELD_TYPE.INT24: convert_int,
FIELD_TYPE.YEAR: convert_int,
FIELD_TYPE.TIMESTAMP: convert_mysql_timestamp,
FIELD_TYPE.DATETIME: convert_datetime,
FIELD_TYPE.TIME: convert_timedelta,
FIELD_TYPE.DATE: convert_date,
FIELD_TYPE.SET: convert_set,
FIELD_TYPE.BLOB: convert_characters,
FIELD_TYPE.TINY_BLOB: convert_characters,
FIELD_TYPE.MEDIUM_BLOB: convert_characters,
FIELD_TYPE.LONG_BLOB: convert_characters,
FIELD_TYPE.STRING: convert_characters,
FIELD_TYPE.VAR_STRING: convert_characters,
FIELD_TYPE.VARCHAR: convert_characters,
#FIELD_TYPE.BLOB: str,
#FIELD_TYPE.STRING: str,
#FIELD_TYPE.VAR_STRING: str,
#FIELD_TYPE.VARCHAR: str
}
conversions = decoders # for MySQLdb compatibility
try:
# python version > 2.3
from decimal import Decimal
def convert_decimal(connection, field, data):
data = data.decode(connection.charset)
return Decimal(data)
decoders[FIELD_TYPE.DECIMAL] = convert_decimal
decoders[FIELD_TYPE.NEWDECIMAL] = convert_decimal
def escape_decimal(obj):
return unicode(obj)
encoders[Decimal] = escape_decimal
except ImportError:
pass
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