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"""MySQLdb type conversion module This module handles all the type conversions for MySQL. If the default type conversions aren't what you need, you can make your own. The dictionary conversions maps some kind of type to a conversion function which returns the corresponding value: Key: FIELD_TYPE.* (from MySQLdb.constants) Conversion function: Arguments: string Returns: Python object Key: Python type object (from types) or class Conversion function: Arguments: Python object of indicated type or class AND conversion dictionary Returns: SQL literal value Notes: Most conversion functions can ignore the dictionary, but it is a required parameter. It is necessary for converting things like sequences and instances. Don't modify conversions if you can avoid it. Instead, make copies (with the copy() method), modify the copies, and then pass them to MySQL.connect(). """ from decimal import Decimal from MySQLdb._mysql import string_literal from MySQLdb.constants import FIELD_TYPE, FLAG from MySQLdb.times import ( Date, DateTimeType, DateTime2literal, DateTimeDeltaType, DateTimeDelta2literal, DateTime_or_None, TimeDelta_or_None, Date_or_None, ) from MySQLdb._exceptions import ProgrammingError import array NoneType = type(None) try: ArrayType = array.ArrayType except AttributeError: ArrayType = array.array def Bool2Str(s, d): return b"1" if s else b"0" def Set2Str(s, d): # Only support ascii string. Not tested. return string_literal(",".join(s)) def Thing2Str(s, d): """Convert something into a string via str().""" return str(s) def Float2Str(o, d): s = repr(o) 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 def None2NULL(o, d): """Convert None to NULL.""" return b"NULL" def Thing2Literal(o, d): """Convert something into a SQL string literal. If using MySQL-3.23 or newer, string_literal() is a method of the _mysql.MYSQL object, and this function will be overridden with that method when the connection is created.""" return string_literal(o) def Decimal2Literal(o, d): return format(o, "f") def array2Str(o, d): return Thing2Literal(o.tostring(), d) # bytes or str regarding to BINARY_FLAG. _bytes_or_str = ((FLAG.BINARY, bytes), (None, str)) conversions = { int: Thing2Str, float: Float2Str, NoneType: None2NULL, ArrayType: array2Str, bool: Bool2Str, Date: Thing2Literal, DateTimeType: DateTime2literal, DateTimeDeltaType: DateTimeDelta2literal, set: Set2Str, Decimal: Decimal2Literal, FIELD_TYPE.TINY: int, FIELD_TYPE.SHORT: int, FIELD_TYPE.LONG: int, FIELD_TYPE.FLOAT: float, FIELD_TYPE.DOUBLE: float, FIELD_TYPE.DECIMAL: Decimal, FIELD_TYPE.NEWDECIMAL: Decimal, FIELD_TYPE.LONGLONG: int, FIELD_TYPE.INT24: int, FIELD_TYPE.YEAR: int, FIELD_TYPE.TIMESTAMP: DateTime_or_None, FIELD_TYPE.DATETIME: DateTime_or_None, FIELD_TYPE.TIME: TimeDelta_or_None, FIELD_TYPE.DATE: Date_or_None, FIELD_TYPE.TINY_BLOB: bytes, FIELD_TYPE.MEDIUM_BLOB: bytes, FIELD_TYPE.LONG_BLOB: bytes, FIELD_TYPE.BLOB: bytes, FIELD_TYPE.STRING: bytes, FIELD_TYPE.VAR_STRING: bytes, FIELD_TYPE.VARCHAR: bytes, FIELD_TYPE.JSON: bytes, }
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