def __read_metadata(self, column_type, column_schema, head):
column_schema["REAL_TYPE"] = column_schema["TYPE_ID"]
if column_schema["COLUMN_TYPE"].find("unsigned") != -1:
column_schema["IS_UNSIGNED"] = True
else:
column_schema["IS_UNSIGNED"] = False
if column_type == FieldType.VAR_STRING or column_type == FieldType.STRING:
head, _ = self.__read_string_metadata(column_schema, head)
elif column_type == FieldType.VARCHAR:
head, column_schema["MAX_LENGTH"] = utils.read_unsigned_int(head, 2)
elif column_type == FieldType.BLOB:
head, column_schema["LENGTH_SIZE"] = utils.read_unsigned_int(head, 1)
elif column_type == FieldType.GEOMETRY:
head, column_schema["LENGTH_SIZE"] = utils.read_unsigned_int(head, 1)
elif column_type == FieldType.NEWDECIMAL:
head, column_schema["PRECISION"] = utils.read_unsigned_int(head, 1)
head, column_schema["DECIMALS"] = utils.read_unsigned_int(head, 1)
elif column_type == FieldType.DOUBLE:
head, column_schema["SIZE"] = utils.read_unsigned_int(head, 1)
elif column_type == FieldType.FLOAT:
head, column_schema["SIZE"] = utils.read_unsigned_int(head, 1)
elif column_type == FieldType.BIT:
head, bit = utils.read_unsigned_int(head, 1)
head, byte = utils.read_unsigned_int(head, 1)
column_schema["BITS"] = (byte * 8) + bit
column_schema["BYTES"] = int((bit + 7) / 8)
return (head, None)
def __read_string_metadata(self, column_schema, head):
head, byte0 = utils.read_unsigned_int(head, 1)
head, byte1 = utils.read_unsigned_int(head, 1)
metadata = (byte0 << 8) + byte1
real_type = metadata >> 8
if real_type == FieldType.SET or real_type == FieldType.ENUM:
column_schema["TYPE_ID"] = real_type
column_schema["SIZE"] = metadata & 0x00ff
self.__read_enum_metadata(column_schema, real_type)
else:
column_schema["MAX_LENGTH"] = (((metadata >> 4) & 0x300) ^ 0x300) + (metadata & 0x00ff)
return (head, None)
def __read_columns(self, head, null_bitmap, column_schemas):
columns = []
for i in xrange(0, len(columns)):
schema = column_schemas[i]
type = schema["REAL_TYPE"]
column = {"type":type, "value":None}
null = True if (null_bitmap[i/8]>>(i%8))&0x01 else False
unsigned = column_schemas[i]["IS_UNSIGNED"]
if null:
column["value"] = None
elif type == FieldType.TINY:
if unsigned:
head, columns["value"] = utils.read_unsigned_int(head, 1, False)
else:
head, columns["value"] = utils.read_signed_int(head, 1, False)
elif type == FieldType.SHORT:
if unsigned:
head, columns["value"] = utils.read_unsigned_int(head, 2, False)
else:
head, columns["value"] = utils.read_signed_int(head, 2, False)
elif type == FieldType.LONG:
if unsigned:
head, columns["value"] = utils.read_unsigned_int(head, 4, False)
else:
head, columns["value"] = utils.read_signed_int(head, 4, False)
elif type == FieldType.INT24:
if unsigned:
head, columns["value"] = utils.read_unsigned_int(head, 3, False)
else:
head, columns["value"] = utils.read_signed_int(head, 3, False)
elif type == FieldType.FLOAT:
head, columns["value"] = utils.read_float(head)
elif type == FieldType.DOUBLE:
head, columns["value"] = utils.read_double(head)
elif type == FieldType.VARCHAR or column.type == FieldType.STRING:
if schema["MAX_LENGTH"] > 255:
head, columns["value"] = utils.read_lc_pascal_string(head, 2)
else:
head, columns["value"] = utils.read_lc_pascal_string(head, 1)
elif type == FieldType.NEWDECIMAL:
head, columns["value"] = self.__read_new_decimal(column)
elif type == FieldType.BLOB:
length_size = schema["LENGTH_SIZE"]
charset = schema["CHARACTER_SET_NAME"]
head, columns["value"] = utils.read_lc_pascal_string(head, length_size, charset)
elif type == FieldType.DATETIME:
head, columns["value"] = utils.read_datetime(head)
elif type == FieldType.TIME:
head, columns["value"] = utils.read_time(head)
elif type == FieldType.DATE:
head, columns["value"] = utils.read_date(head)
elif type == FieldType.TIMESTAMP:
head, timestamp = utils.read_unsigned_int(head, 4)
columns["value"] = datetime.datetime.fromtimestamp(timestamp)
elif type == FieldType.LONGLONG:
if unsigned:
head, columns["value"] = utils.read_unsigned_int(head, 8, False)
else:
head, columns["value"] = utils.read_signed_int(head, 8, False)
elif type == FieldType.YEAR:
head, year = utils.read_unsigned_int(head, 1, False)
columns["value"] = year + 1900
elif type == FieldType.ENUM:
size = schema["SIZE"]
head, index = utils.read_unsigned_int(head, size, False) - 1
columns["value"] = schema["ENUM_VALUES"][index]
elif type == FieldType.SET:
size = schema["SIZE"]
head, index = utils.read_unsigned_int(head, size, False) - 1
columns["value"] = schema["SET_VALUES"][index]
elif type == FieldType.BIT:
bytes = schema["BYTES"]
bits = schema["BITS"]
head, columns["value"] = utils.read_bits(head, bytes, bits)
elif type == FieldType.GEOMETRY:
length_size = schema["LENGTH_SIZE"]
head, columns["value"] = utils.read_lc_pascal_string(head, length_size)
else:
raise NotImplementedError("Unknown MySQL column type: %d" % (type))
columns.append(column)
return columns
