Linux lhjmq-records 5.15.0-118-generic #128-Ubuntu SMP Fri Jul 5 09:28:59 UTC 2024 x86_64
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import datetime
from decimal import Decimal
import re
import time
from .err import ProgrammingError
from .constants import FIELD_TYPE
def escape_item(val, charset, mapping=None):
if mapping is None:
mapping = encoders
encoder = mapping.get(type(val))
# Fallback to default when no encoder found
if not encoder:
try:
encoder = mapping[str]
except KeyError:
raise TypeError("no default type converter defined")
if encoder in (escape_dict, escape_sequence):
val = encoder(val, charset, mapping)
else:
val = encoder(val, mapping)
return val
def escape_dict(val, charset, mapping=None):
raise TypeError("dict can not be used as parameter")
def escape_sequence(val, charset, mapping=None):
n = []
for item in val:
quoted = escape_item(item, charset, mapping)
n.append(quoted)
return "(" + ",".join(n) + ")"
def escape_set(val, charset, mapping=None):
return ",".join([escape_item(x, charset, mapping) for x in val])
def escape_bool(value, mapping=None):
return str(int(value))
def escape_int(value, mapping=None):
return str(value)
def escape_float(value, mapping=None):
s = repr(value)
if s in ("inf", "nan"):
raise ProgrammingError("%s can not be used with MySQL" % s)
if "e" not in s:
s += "e0"
return s
_escape_table = [chr(x) for x in range(128)]
_escape_table[0] = "\\0"
_escape_table[ord("\\")] = "\\\\"
_escape_table[ord("\n")] = "\\n"
_escape_table[ord("\r")] = "\\r"
_escape_table[ord("\032")] = "\\Z"
_escape_table[ord('"')] = '\\"'
_escape_table[ord("'")] = "\\'"
def escape_string(value, mapping=None):
"""escapes *value* without adding quote.
Value should be unicode
"""
return value.translate(_escape_table)
def escape_bytes_prefixed(value, mapping=None):
return "_binary'%s'" % value.decode("ascii", "surrogateescape").translate(
_escape_table
)
def escape_bytes(value, mapping=None):
return "'%s'" % value.decode("ascii", "surrogateescape").translate(_escape_table)
def escape_str(value, mapping=None):
return "'%s'" % escape_string(str(value), mapping)
def escape_None(value, mapping=None):
return "NULL"
def escape_timedelta(obj, mapping=None):
seconds = int(obj.seconds) % 60
minutes = int(obj.seconds // 60) % 60
hours = int(obj.seconds // 3600) % 24 + int(obj.days) * 24
if obj.microseconds:
fmt = "'{0:02d}:{1:02d}:{2:02d}.{3:06d}'"
else:
fmt = "'{0:02d}:{1:02d}:{2:02d}'"
return fmt.format(hours, minutes, seconds, obj.microseconds)
def escape_time(obj, mapping=None):
if obj.microsecond:
fmt = "'{0.hour:02}:{0.minute:02}:{0.second:02}.{0.microsecond:06}'"
else:
fmt = "'{0.hour:02}:{0.minute:02}:{0.second:02}'"
return fmt.format(obj)
def escape_datetime(obj, mapping=None):
if obj.microsecond:
fmt = "'{0.year:04}-{0.month:02}-{0.day:02} {0.hour:02}:{0.minute:02}:{0.second:02}.{0.microsecond:06}'"
else:
fmt = "'{0.year:04}-{0.month:02}-{0.day:02} {0.hour:02}:{0.minute:02}:{0.second:02}'"
return fmt.format(obj)
def escape_date(obj, mapping=None):
fmt = "'{0.year:04}-{0.month:02}-{0.day:02}'"
return fmt.format(obj)
def escape_struct_time(obj, mapping=None):
return escape_datetime(datetime.datetime(*obj[:6]))
def Decimal2Literal(o, d):
return format(o, "f")
def _convert_second_fraction(s):
if not s:
return 0
# Pad zeros to ensure the fraction length in microseconds
s = s.ljust(6, "0")
return int(s[:6])
DATETIME_RE = re.compile(
r"(\d{1,4})-(\d{1,2})-(\d{1,2})[T ](\d{1,2}):(\d{1,2}):(\d{1,2})(?:.(\d{1,6}))?"
)
def convert_datetime(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 isinstance(obj, (bytes, bytearray)):
obj = obj.decode("ascii")
m = DATETIME_RE.match(obj)
if not m:
return convert_date(obj)
try:
groups = list(m.groups())
groups[-1] = _convert_second_fraction(groups[-1])
return datetime.datetime(*[int(x) for x in groups])
except ValueError:
return convert_date(obj)
TIMEDELTA_RE = re.compile(r"(-)?(\d{1,3}):(\d{1,2}):(\d{1,2})(?:.(\d{1,6}))?")
def convert_timedelta(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.
"""
if isinstance(obj, (bytes, bytearray)):
obj = obj.decode("ascii")
m = TIMEDELTA_RE.match(obj)
if not m:
return obj
try:
groups = list(m.groups())
groups[-1] = _convert_second_fraction(groups[-1])
negate = -1 if groups[0] else 1
hours, minutes, seconds, microseconds = groups[1:]
tdelta = (
datetime.timedelta(
hours=int(hours),
minutes=int(minutes),
seconds=int(seconds),
microseconds=int(microseconds),
)
* negate
)
return tdelta
except ValueError:
return obj
TIME_RE = re.compile(r"(\d{1,2}):(\d{1,2}):(\d{1,2})(?:.(\d{1,6}))?")
def convert_time(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.
"""
if isinstance(obj, (bytes, bytearray)):
obj = obj.decode("ascii")
m = TIME_RE.match(obj)
if not m:
return obj
try:
groups = list(m.groups())
groups[-1] = _convert_second_fraction(groups[-1])
hours, minutes, seconds, microseconds = groups
return datetime.time(
hour=int(hours),
minute=int(minutes),
second=int(seconds),
microsecond=int(microseconds),
)
except ValueError:
return obj
def convert_date(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
"""
if isinstance(obj, (bytes, bytearray)):
obj = obj.decode("ascii")
try:
return datetime.date(*[int(x) for x in obj.split("-", 2)])
except ValueError:
return obj
def through(x):
return x
# def convert_bit(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
convert_bit = through
encoders = {
bool: escape_bool,
int: escape_int,
float: escape_float,
str: escape_str,
bytes: escape_bytes,
tuple: escape_sequence,
list: escape_sequence,
set: escape_sequence,
frozenset: 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,
Decimal: Decimal2Literal,
}
decoders = {
FIELD_TYPE.BIT: convert_bit,
FIELD_TYPE.TINY: int,
FIELD_TYPE.SHORT: int,
FIELD_TYPE.LONG: int,
FIELD_TYPE.FLOAT: float,
FIELD_TYPE.DOUBLE: float,
FIELD_TYPE.LONGLONG: int,
FIELD_TYPE.INT24: int,
FIELD_TYPE.YEAR: int,
FIELD_TYPE.TIMESTAMP: convert_datetime,
FIELD_TYPE.DATETIME: convert_datetime,
FIELD_TYPE.TIME: convert_timedelta,
FIELD_TYPE.DATE: convert_date,
FIELD_TYPE.BLOB: through,
FIELD_TYPE.TINY_BLOB: through,
FIELD_TYPE.MEDIUM_BLOB: through,
FIELD_TYPE.LONG_BLOB: through,
FIELD_TYPE.STRING: through,
FIELD_TYPE.VAR_STRING: through,
FIELD_TYPE.VARCHAR: through,
FIELD_TYPE.DECIMAL: Decimal,
FIELD_TYPE.NEWDECIMAL: Decimal,
}
# for MySQLdb compatibility
conversions = encoders.copy()
conversions.update(decoders)
Thing2Literal = escape_str
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