Alter "Default" in SQL Server -

-

i have custom default value in sql server 2008 table.

similar 

create default [dbo].[default_timestamp]     getdate()

now want change value in default. 

create default [dbo].[default_timestamp]     getutcdate()

before can edit existing one, need drop first 1 , recreate it.

drop default [dbo].[default_timestamp]

it gives following error.

msg 3716, level 16, state 3, line 4
default 'dbo.default_timestamp' cannot dropped because bound 1 or more column.

since default use few tables cannot drop , recreate new one.

i know need unbind tables default before can recreate it.

can provide script list table , columns bound default?

it's multi-step process:

1) find object_id default :

declare @defaultobjectid int select @defaultobjectid = object_id('default_timestamp')

2) find columns reference default:

select      columnname = c.name,     tablename = t.name,     unbindcmd = 'exec sp_unbindefault ''' + t.name + '.' + c.name + '''' sys.columns c inner join sys.tables t on c.object_id = t.object_id default_object_id = @defaultobjectid

this produce list of unbindcmd commands remove default columns.

3) now, copy column sql server mgmt studio window, , execute in new query window "unbind" default columns

4) define new default

however: these days, not define new default per se - can't set default constraint on columns in question directly? 

alter table dbo.yourtable add constraint df_yourtable_timestamp default getutcdate() yourcolumnname

seems easier work going future! when explicitly name constraint, can find , drop constraint again, if need be.


Comments

Post a Comment

Popular posts from this blog

c# - SVN Error : "svnadmin: E205000: Too many arguments" -

-
i trying reposotries using c# code process svncommand = null; var psi = new processstartinfo("svnadmin"); psi.redirectstandardoutput = true; psi.redirectstandarderror = true; psi.useshellexecute = false; psi.arguments= @"dump c:\repositories\myrepo > c:\temp\myrepodumpfile.dump"; using (svncommand = process.start(psi)) { var myoutput = svncommand.standardoutput; var myerror = svncommand.standarderror; debug.write("output :" + environment.newline + environment.newline + myoutput.readtoend() + environment.newline + "error :" + environment.newline + environment.newline + myerror.readtoend()); svncommand.close(); } when use dump command commandline svnadmin dump c:\repositories\myrepo > c:\temp\myrepodumpfile.dump it works fine when try ...
Read more

c++ - Using OpenSSL in a multi-threaded application -

-
i have been writing soap client application in c++ on ubuntu using openssl https transport , pthreads threading. have number of threads - 1 central data acquisition thread periodically gets worker threads make soap requests via shared mutex protected queues. reading documentation openssl found is openssl thread-safe? in openssl faq describes mechanisms required ensure thread safety when using openssl. implemented , works fine. the reason question conceptual difficulty really. thinking implementing same functionality application has already, instead of using threads, create 2 seperate applications : 1 worker thread (of multiple copies running) , main data acquisition thread. use tcp sockets communicate between 2 rather mutex protected queues. may bad idea not important - confusing me would have implement same functions required ensure openssl thread safety in second approach or not? my guess not have , treated independent (indeed surely must many applications use openssl) re...
Read more

All overlapping substrings matching a java regex -

-
is there api method returns (possibly overlapping) substrings match regular expression? for example, have text string: string t = 04/31 412-555-1235; , , have pattern: pattern p = new pattern("\\d\\d+"); matches strings of 2 or more characters. the matches are: 04, 31, 412, 555, 1235. how overlapping matches? i want code return: 04, 31, 41, 412, 12, 55, 555, 55, 12, 123, 1235, 23, 235, 35. theoretically should possible -- there obvious o(n^2) algorithm enumerates , checks substrings against pattern. edit rather enumerating substrings, safer use region(int start, int end) method in matcher . checking pattern against separate, extracted substring might change result of match (e.g. if there non-capturing group or word boundary check @ start/end of pattern). edit 2 actually, it's unclear whether region() expect zero-width matches. specification vague, , experiments yield disappointing results. for example: string line = "xx90xx"; strin...
Read more