# -*- coding: utf-8 -*-
# @Time : 2023/1/17 9:45 AM
# @Author : Ultipa
# @Email : support@ultipa.com
# @File : null.py
import sys
from ultipa.types import ULTIPA_REQUEST, ULTIPA, ULTIPA_RESPONSE
from ultipa.utils.errors import ParameterException, ServerException, SerializeException, checkError
StringNull = bytes([0x00])
Int32Null = bytes([0x7f,0xff,0xff,0xff])
Uint32Null =bytes([0xff,0xff,0xff,0xff])
Int64Null = bytes([0x7f,0xff,0xff,0xff,0xff,0xff,0xff,0xff])
Uint64Null = bytes([0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff])
FloatNull = bytes([0xff,0xff,0xff,0xff])
DoubleNull = bytes([0xff,0xff,0xff,0xff,0xff,0xff,0xff,0xff])
PointNull = bytes([0x6e,0x75,0x6c,0x6c])
[docs]
def nullValue(type:ULTIPA.PropertyType):
'''
Returns the null value corresponding to different data types
Args:
type: The data type
Returns:
'''
if type in [ULTIPA.PropertyType.PROPERTY_STRING,ULTIPA.PropertyType.PROPERTY_TEXT,ULTIPA.PropertyType.PROPERTY_BLOB,ULTIPA.PropertyType.PROPERTY_DECIMAL]:
return StringNull
elif type == ULTIPA.PropertyType.PROPERTY_INT32:
return Int32Null
elif type == ULTIPA.PropertyType.PROPERTY_UINT32:
return Uint32Null
elif type == ULTIPA.PropertyType.PROPERTY_INT64:
return Int64Null
elif type == ULTIPA.PropertyType.PROPERTY_UINT64:
return Uint64Null
elif type == ULTIPA.PropertyType.PROPERTY_FLOAT:
return FloatNull
elif type == ULTIPA.PropertyType.PROPERTY_DOUBLE:
return DoubleNull
elif type == ULTIPA.PropertyType.PROPERTY_DATETIME:
return Uint64Null
elif type == ULTIPA.PropertyType.PROPERTY_TIMESTAMP:
return Uint32Null
elif type == ULTIPA.PropertyType.PROPERTY_POINT:
return PointNull
elif type in [ULTIPA.PropertyType.PROPERTY_LIST,ULTIPA.PropertyType.PROPERTY_SET]:
return None
raise SerializeException(f"not support [{ULTIPA_REQUEST.Property._PropertyReverseMap.get(type)}]")
[docs]
def isNullValue(v: any, type:ULTIPA.PropertyType):
'''
Judge whether a value is null
Args:
v: The value to be judged
type: The property type of v
Returns:
bool
'''
try:
nullV = nullValue(type)
return nullV == v
except Exception as e:
raise SerializeException(e)
return False
if __name__ == '__main__':
print(sys.float_info.max)
print(sys.int_info)
print("Int32Null：",Int32Null)
print("Ret：",0X7FFFFFFF==Int32Null)
print("Uint32Null：",Uint32Null)
print("Int64Null：",Int64Null)
print("Uint64Null：",Uint64Null)
print("FloatNull：",FloatNull)
print("DoubleNull：",DoubleNull)