自定义Django二进制字段& SQL Server 2008 [英] Custom Django binary field & SQL Server 2008
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问题描述
我有一个表:
CREATE TABLE [organization_division] (
[id] int IDENTITY (1, 1) NOT NULL PRIMARY KEY,
[uuid] binary(16) NOT NULL
)
我可以使用SQL查询插入一条记录:
I can insert a record with SQL query:
INSERT INTO [organization_division] ([uuid]) VALUES (0x244c71c6c9444f38b67ab1dcfbb5fc32)
该表的Django模型是:
The Django model for this table is:
from apps.lib.fields import GUIDField
class Division(models.Model):
uuid = GUIDField()
GUIDField是我尝试创建自定义字段的:
GUIDField is my attempt to create a custom field:
class GUIDField(models.Field):
description = "GUID binary field"
__metaclass__ = models.SubfieldBase
def __init__(self, *args, **kwargs):
kwargs['max_length'] = 16
super(GUIDField, self).__init__(*args, **kwargs)
def db_type(self, connection):
return 'binary(16)'
我需要传递16位二进制从ORM实例到数据库的数据。最有可能我得到一个无条件的字符串,紧跟着SQL Server端的 0x ...但是如何?
I need to pass 16 byte binary data from ORM instance to the database. Most likely I have to get an unquoted string followed by 0x on the SQL Server side... But how?
m使用unixodbc,pyodbc,django-odbc。
I'm using unixodbc, pyodbc, django-odbc.
推荐答案
from django.db import models
import pyodbc
class GUIDField(models.Field):
description = "GUID binary field"
__metaclass__ = models.SubfieldBase
def __init__(self, *args, **kwargs):
kwargs['max_length'] = 16
super(GUIDField, self).__init__(*args, **kwargs)
def db_type(self, connection):
return 'binary(16)'
def get_db_prep_value(self, value):
if value is None:
return None
return pyodbc.BINARY(value)
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