go - Is it possible for Google App Engine string and integer datastore keys to clash? -

-

this question has answer here:

i have datastore entity of kind myentity , want use stringid keys , other times use intid keys generated allocateids.

can safely mix string , integer ids without worrying string id might surreptitiously overwrite integer id generated allocateids , vice versa?

the reason ask because assume string , integer ids use same index. possible accidentally have sequence of bytes represent string id same sequence of bytes represent integer id on same index? or string , integer ids namespaced in way prevent collisions?

yes, can safely mix string & int ids same kind - same key (entity) can not use both @ same time. there no danger of overlapping. guess under hood use protocol buffers serialize key []byte.

i used in production without issues.

though maybe not best design depends on case.


Comments

Post a Comment

Popular posts from this blog

javascript - Laravel datatable invalid JSON response -

-
everything work fine on code below fetch user logs: js: <script> $(document).ready(function () { var table =$('#systemlogs').datatable({ responsive: true, processing: true, serverside: true, "language": { "url": "/datatables/media/plug-in/persian.json" }, ajax: '{!! url('/admin/systemlogs/data/systemlogsdatatable') !!}', columns: [ { data: 'name', name: 'name' }, { data: 'message_text', name: 'message_text' }, { data: 'remote_addr', name: 'remote_addr' }, { data: 'log_created_at', name: 'management_logs.created_at' }, { data: 'log_updated_at', name: 'management_logs.updated_at' }, ] }); }); </script> routes: route::get('/systemlogs/data/systemlogsdatatable','systemlogscontrolle...
Read more

java - Exception in thread "main" org.springframework.context.ApplicationContextException: Unable to start embedded container; -

-
i getting error when run spring application: exception in thread "main" org.springframework.context.applicationcontextexception: unable start embedded container; nested exception org.springframework.context.applicationcontextexception: unable start embeddedwebapplicationcontext due missing embeddedservletcontainerfactory bean. @ org.springframework.boot.context.embedded.embeddedwebapplicationcontext.onrefresh(embeddedwebapplicationcontext.java:124) @ org.springframework.context.support.abstractapplicationcontext.refresh(abstractapplicationcontext.java:476) @ org.springframework.boot.context.embedded.embeddedwebapplicationcontext.refresh(embeddedwebapplicationcontext.java:109) @ org.springframework.boot.springapplication.refresh(springapplication.java:691) @ org.springframework.boot.springapplication.run(springapplication.java:320) @ org.springframework.boot.springapplication.run(springapplication.java:952) @ org.springframework.boot.springa...
Read more

sql server 2008 - My Sql Code Get An Error Of Msg 245, Level 16, State 1, Line 1 Conversion failed when converting the varchar value '8:45 AM' to data type int -

-
msg 245, level 16, state 1, line 1 conversion failed when converting varchar value '8:45 am' data type int. script declare @specimenid bigint = 0, @script varchar(max); declare @starttime int = (select convert(int,substring(start_time,0,charindex(':', start_time)) - 12) appt appt._id=112601) --select @starttime set @script = 'select distinct ptlast_name + '', '' + pt.first_name patient_name, dbo.formatdate(pt.dob,''mm/dd/yyyy'') dob, (convert(varchar, (datediff(yy, dob, appt_date) - case when (month(dob) > month(appt_date)) or (month(dob) = month(appt_date) , day(dob) > day(appt_date)) 1 else 0 end)) + ''/'' + convert(varchar, (datediff(m, dateadd(yy, (datediff(yy, dob, appt_date) - case when (month(dob) > month(appt_date)) or (month(dob) = month(appt_date) , day(dob) > day(appt_date)) 1 else 0 end), d...
Read more