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converters.py

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", "-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:

>>> convert_datetime('2007-02-25 23:06:20')
      datetime.datetime(2007, 2, 25, 23, 6, 20)
      >>> convert_datetime('2007-02-25T23:06:20')
      datetime.datetime(2007, 2, 25, 23, 6, 20)

Illegal values are returned as str:

>>> convert_datetime('2007-02-31T23:06:20')
      '2007-02-31T23:06:20'
      >>> convert_datetime('0000-00-00 00:00:00')
      '0000-00-00 00:00:00'
    """
    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:

>>> convert_timedelta('25:06:17')
      datetime.timedelta(days=1, seconds=3977)
      >>> convert_timedelta('-25:06:17')
      datetime.timedelta(days=-2, seconds=82423)

Illegal values are returned as string:

>>> convert_timedelta('random crap')
      'random crap'

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:

>>> convert_time('15:06:17')
      datetime.time(15, 6, 17)

Illegal values are returned as str:

>>> convert_time('-25:06:17')
      '-25:06:17'
      >>> convert_time('random crap')
      'random crap'

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:

>>> convert_date('2007-02-26')
      datetime.date(2007, 2, 26)

Illegal values are returned as str:

>>> convert_date('2007-02-31')
      '2007-02-31'
      >>> convert_date('0000-00-00')
      '0000-00-00'
    """
    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

# Run doctests with `pytest --doctest-modules pymysql/converters.py`

Name	Type	Size	Permission	Last Modified	Actions
.	dir	-	0755	2025-08-05 05:00:40
..	dir	-	0755	2025-11-10 11:07:59
__pycache__	dir	-	0755	2025-08-05 05:01:10
constants	dir	-	0755	2025-08-05 05:00:40
__init__.py	text/plain	4.17 KB	0644	2025-07-04 01:31:01
_auth.py	text/plain	7.24 KB	0644	2025-07-04 01:31:01
charset.py	text/x-script.python	10 KB	0644	2025-07-04 01:31:01
connections.py	text/x-script.python	52.43 KB	0644	2025-07-04 01:31:01
converters.py	text/x-script.python	9.3 KB	0644	2025-07-04 01:31:01
cursors.py	text/x-script.python	16.15 KB	0644	2025-07-04 01:31:01
err.py	text/x-script.python	4.08 KB	0644	2025-07-04 01:31:01
optionfile.py	text/x-script.python	651 B	0644	2025-07-04 01:31:01
protocol.py	text/x-script.python	11.54 KB	0644	2025-07-04 01:31:01
times.py	text/x-script.python	360 B	0644	2025-07-04 01:31:01