折腾：
［已解决］SQLAlchemy中给列的id从数字变成UUID
期间，需要去了解，uuid4是啥。
搜：
uuid.uuid4
21.20. uuid — UUID objects according to RFC 4122 — Python 3.5.2 documentation
Python使用UUID库生成唯一ID – dkcndk – 博客园
Python中生成唯一码（uuid的使用） – Hello World! – 博客频道 – CSDN.NET
Python中产生UUID函数uuid1与uuid4的选择 – 软件开发程序员博客文章收藏网
http://www.programgo.com/article/68512035953/
－》还是用uuid4
因为uuid1，还是基于Mac地址算出来的
－》此处uuid和mac无关，所以不用uuid1
－》uuid4，足够随机，够用了。
［后记］
from sqlalchemy.sql import func import uuid def generateUUID(prefx = “”): newUuidHex = uuid.uuid4().hex newUuid = prefx + newUuidHex gLog.debug(“prefx=%s, newUuidHex=%s, newUuid=%s”, prefx, newUuidHex, newUuid) return newUuid class Event(db.Model): __tablename__ = “events” id = db.Column(db.String(64), primary_key=True, default = generateUUID(“event-“), nullable=False) |
输出：
DEBUG in models [/usr/share/nginx/html/SIPEvents/sipevents/models.py:97]: prefx=event-, newUuidHex=4f20551a6644474489ab6e0165f0986d, newUuid=event-4f20551a6644474489ab6e0165f0986d added newEvent=<Event:id=event-4f20551a6644474489ab6e0165f0986d,title=u’\u8ba8\u8bba\u65e5\u5386\u7684\u516c\u4f17\u53f7\u540d\u5b57′,user_openid=oswjmv4X0cCXcfkIwjoDfCkeTVVY> <div–<—————————————————————————— <div–<—————————————————————————— DEBUG in db_create [db_create.py:164]: currentEvents=[<Event:id=event-4f20551a6644474489ab6e0165f0986d,title=u’\u8ba8\u8bba\u65e5\u5386\u7684\u516c\u4f17\u53f7\u540d\u5b57′,user_openid=oswjmv4X0cCXcfkIwjoDfCkeTVVY>], currentEventsCount=1 |
20.15. uuid — UUID objects according to RFC 4122 — Python 2.7.12 documentation
然后用代码：
def generateUUID(prefx = “”): # newUuidHex = uuid.uuid4().hex # newUuid = prefx + newUuidHex # gLog.debug(“prefx=%s, newUuidHex=%s, newUuid=%s”, prefx, newUuidHex, newUuid) generatedUuid4 = uuid.uuid4() gLog.debug(“type(generatedUuid4)=%s, generatedUuid4=%s”, type(generatedUuid4), generatedUuid4) generatedUuid4Str = str(generatedUuid4) newUuid = prefx + generatedUuid4Str gLog.debug(“prefx=%s, generatedUuid4Str=%s, newUuid=%s”, prefx, generatedUuid4Str, newUuid) return newUuid |
输出：
type(generatedUuid4)=<class ‘uuid.UUID’>, generatedUuid4=1ff3408d-3b3f-4872-b833-aaed4a8cc447 <div–<—————————————————————————— <div–<—————————————————————————— DEBUG in models [/usr/share/nginx/html/SIPEvents/sipevents/models.py:102]: prefx=event-, generatedUuid4Str=1ff3408d-3b3f-4872-b833-aaed4a8cc447, newUuid=event-1ff3408d-3b3f-4872-b833-aaed4a8cc447 |
［总结］
- uuid.uuid4().hex输出纯字母和数据，中间不带短横线：
- 4f20551a6644474489ab6e0165f0986d
- str(uuid.uuid4())输出的是中间带短横线的：
- 1ff3408d-3b3f-4872-b833-aaed4a8cc447
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