Identity nabber for MSSQL

[wardk]

This is a code snippet that I created to test a method suggested by someone on deja.com. The @@IDENTITY variable should hold the value of an "identity" column after an insert. This "throw away" code confirmed this method would work for me, it may be useful to anyone using MS Sql server via perl. Note that I think this should work for Sybase as well.

#/usr/local/bin/perl
#  identity.pl   - MS Sql Server IDENTITY test script
#  Inserts a record, then grabs the IDENTITY value from that insert an
+d displays it
use Win32::ODBC;

#  you will format your own Connect string for the database call
use dbconnect;
$CONNECT = GetConnectString();

my $db="";
if (!($db = new Win32::ODBC($CONNECT)))
{
   $ThisSub = (caller(0))[3];
   $ErrMsg = "$ThisSub: Error connecting to $CONNECT" . "Error: " . $d
+b->Error() . "\n";
   print $ErrMsg;
}

my $Sql = "insert into foobs ( FooTitle, FooDesc) values ( \'New Foo\'
+, \'yet another new foo\' )";
if ( $db->sql($Sql) )
{
  print "error on insert\n";   # do something more elegent here
}
else
{
  my $Sql = qq/ select \@\@IDENTITY as \'foo\' /;
  if ( $db->sql($Sql) )
  {
    print "error on select\n";   # do something more elegent here
  }
  else
  {
      $db->fetchrow();
      %Data = $db->DataHash();
      $foo = $Data{"foo"};
      print "Indenty for insert is $foo";
  }
}
exit;

[davorg]

Hope you don't mind if I make a few little 'tweaks' to your code.

Dave...

#/usr/local/bin/perl -w
#  identity.pl   - MS Sql Server IDENTITY test script
#  Inserts a record, then grabs the IDENTITY value from 
# that insert and displays it

use strict; # ALWAYS use strict (and -w as above)
use Win32::ODBC;

# you will format your own Connect string for the database 
# call
use dbconnect;
$CONNECT = GetConnectString();

my $db='';  # No need for double quotes here

# unless(x) instead of if (!x)
unless ($db = new Win32::ODBC($CONNECT))
{
   $ThisSub = (caller(0))[3];
   $ErrMsg = "$ThisSub: Error connecting to $CONNECT" . "Error: " . $d
+b->Error() . "\n";
   print $ErrMsg;
}

# No need to escape the single quotes here...
my $Sql = "insert into foobs ( FooTitle, FooDesc) values ( 'New Foo', 
+'yet another new foo' )";
if ( $db->sql($Sql) )
{
  print "error on insert\n";   # do something more elegant here
}
else
{
  # If you change the qq to q, then there's no need
  # to escape the @ or the single quotes
  my $Sql = q/ select @@IDENTITY as 'foo' /;
  if ( $db->sql($Sql) )
  {
    print "error on select\n";   # do something more elegant here
  }
  else
  {
      $db->fetchrow();
      %Data = $db->DataHash();
      # No need to quote the hash key foo.
      $foo = $Data{foo};
      print "Indentity for insert is $foo";
  }
}
exit;