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  • From: Shaun Craig <s.craig AT andronics.com>
  • To: FreeTDS Development Group <freetds AT lists.ibiblio.org>
  • Subject: Re: [freetds] SELECT @@IDENTITY AS InsertID
  • Date: Thu, 06 Oct 2005 16:36:34 +0100

Right i'm trying to get my head round this, i'm doing things slightly different in my code, as follows

Query = 'Insert Into Table .......etc Select @@Identity as InsertId'

I break the query string up depending on how many statements are in it, so for above i have 2, 1 for insert and 1 for select

for ( x = 0; x < amount of statments + 1; x++ )
{ //first time around it will be the insert which inserts ok
dbcmd(dbconn, statements[x])
dbsqlexec(dbconn)
dbresults(dbconn)

if we find that the statement is a 'Select @@Identity..etc' we go in here, we wont the first time but when we go around the second time we will go in.
{ // try bind select to variable
dbbind(dbconn, 1, INTBIND, (DBINT)0, (BYTE *)& InsertID); //its says its binding ok but what its binding i cant be sure!

if (dbnextrow(dbconn) != NO_MORE_ROWS)
journey_insert_id = InsertID;
}
}

So in theory im calling dbresults for each statment, cant think of way around this yet!

Thompson, Bill D (London) wrote:

Hi shaun,

you may need to call dbresults more than once before binding and
nextrow-ing

you would get a dbresults return for the insert statemnt and then
another for the select

you can check it with DBROWS as per this bit from the sybase manual:

while ((return_code = dbresults(dbproc)!=NO_MORE_RESULTS)
{ if ((return_code == SUCCEED) && (DBROWS(dbproc) == SUCCEED)) { /* Bind column data to program variables */ dbbind(dbproc, 1, INTBIND, (DBINT) 0, (BYTE *) &xvariable); dbbind(dbproc, 2, STRINGBIND, (DBINT) 0,
yvariable);

/* Now process each row */ while (dbnextrow(dbproc) != NO_MORE_ROWS) {

HTH,

Bill


-----Original Message-----
From: freetds-bounces AT lists.ibiblio.org
[mailto:freetds-bounces AT lists.ibiblio.org] On Behalf Of Shaun Craig
Sent: 06 October 2005 15:50
To: FreeTDS Development Group
Subject: [freetds] SELECT @@IDENTITY AS InsertID


Hi all,

I've got an insert statement with SELECT @@IDENTITY AS InsertID at the end as I want to know what row the record was inserted into. I know the

line I use works as i've tested it through tsql and its gives me back the correct row number. The problem is in my C code i cant get the value passed back to me, this is my code so far.

DBINT InsertID;
journey_id //global variable of type int
Query //which contains my insert statement and SELECT @@IDENTITY AS
InsertID

dbfcmd(dbconn, Query)
dbsqlexec(dbconn)
dbresults(dbconn)

//Now i'm trying to bind the returned row number into InsertID
dbbind(dbconn, 1, INTBIND, (DBINT)0, (BYTE *)& InsertID);

if (dbnextrow(dbconn) != NO_MORE_ROWS)
{
journey_id = InsertID;
}

Unfortunately my program crashes either at the bind or dbnextrow() as i'm doing something wrong.

Any help would be appreciated as this is holding me back from other stuff, thanks.

Shaun.
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--
Shaun Craig
Andronics Ltd. Tel: 02871273118
Web: http://www.andronics.co.uk





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