Generating sequence number in C# -

-

i working on asp.net using c# want generate sequence id should this:

elg0001 , elg0002, ...

elg prefix , 0001 should in sequence

i using sql server 2005

this id generated , added database. how can this?

can me coding?

here's simple id generator sql server:

create table idseed (     id int identity(10001,1) ) go  create procedure newsequenceid (     @newid char(7) out ) begin     insert idseed default values      select @newid = 'elg' + right(cast(scope_identity() nvarchar(5)), 4) end go  /*  * test newsequenceid proc  */ declare @testid char(7)  exec newsequenceid @testid out  select @testid

the idseed table continue accumulate rows. not issue, if problem can purge table script on regular basis. part left call procedure c# code , retrieve value of @testid parameter.

this example based on question: sequence not expected exceed 9999 elements. have modify code support larger sequence ids.

note transaction not necessary in procedure newsequenceid because scope_identity() function returns values current sql session. if thread performs near-simultaneous insert, value returned scope_identity() won't affected.


Comments

Post a Comment

Popular posts from this blog

c++ - How do I get a multi line tooltip in MFC -

-
right now, have tool tip pops when hover on edit box. problem tool tip contains multiple error messages , in 1 long line. need have each error message on own line. error messages contained in cstring new line seperating them. my existing code below. bool ontooltiptext(uint, nmhdr* pnmhdr, lresult* presult) { assert(pnmhdr->code == ttn_needtexta || pnmhdr->code == ttn_needtextw); // need handle both ansi , unicode versions of message tooltiptexta* pttta = (tooltiptexta*)pnmhdr; tooltiptextw* ptttw = (tooltiptextw*)pnmhdr; // tchar szfulltext[256]; cstring strtiptext=_t(""); uint nid = pnmhdr->idfrom; if (pnmhdr->code == ttn_needtexta && (pttta->uflags & ttf_idishwnd) || pnmhdr->code == ttn_needtextw && (ptttw->uflags & ttf_idishwnd)) { // idfrom hwnd of tool nid = ::getdlgctrlid((hwnd)nid); } //m_errprojaccel[ch] contains 1 or more error messages each...
Read more

asp.net - In javascript how to find the height and width -

-
i having .aspx , masterpage page. in masterpage loading aspx page . in aspx page design using generating table structure using code-behind server in javascript how find height , width . regards, kumar if you're looking table height , width, should it var tbl = document.getelementbyid('tbldemo'); alert(tbl.offsetwidth + '\n' + tbl.offsetheight);
Read more

c# - DataTable to EnumerableRowCollection -

-
i have datatable according client requirement can contain invalid date "00/00/1999",null,empty string.(typed datset) when collect them enumerables wish convert of invalid forms empty string. (i.e) enumerablerowcollection<datarow> query = order in _table.asenumerable() select new { orderdate= string.isnullorempty(convert.tostring(order.field<datetime>("orderdate")) || (how check date invalid date) ? string.empty : order.field<datetime>("orderdate") } how check whether date valid date or not? datetime.tryparse...like given current code: datetime date; enumerablerowcollection<datarow> query = order in _table.asenumerable() select new { orderdate= string.isnullorempty(convert.tostring(order.field<datetime>("orderdate")) || !datetime.tryparse(convert.tostring(order.field<datetime...
Read more