Do placeholders work in SET clause of UPDATE query for column datatype of UNSIGNED INT in ASE 15.7+?
After much time wasting I found -- with DBI 1.625, DBD::Sybase 1.14, & ASE 15.7 -- that ...
- VARCHAR datatype is being used for column of UNSIGNED INT datatype in SET clause of UPDATE query when placeholder is used. The error message is similar to ...
DBD::Sybase::st execute failed: Server message number=257 severity=16
+state=1 line=0 server=DB_SERVER procedure=DBD2 text=Implicit conversi
+on from datatype 'VARCHAR' to 'UNSIGNED INT' is not allowed. Use the
+ CONVERT function to run this query.
Statement= UPDATE db..table
SET col =
:p1
-- %d
WHERE search_col = :p2
- neither does explicitly setting the datatype help: $sth->bind_param( $place , $var , SQL_INTEGER ) as it produces same error as above;
- neither does CONVERT function works per above error message (besides the point that I question the value of using a placeholder at all in this case); the following error message is noted in DBD::Sybase ...
DBD::Sybase::db prepare failed: Server message number=12828 severity=1
+6 state=1 line=1 server=DB_SERVER procedure=DBD2 text=The datatype of
+ a parameter marker used in the dynamic prepare statement could not b
+e resolved.
Statement= UPDATE db..table
SET
col
=
--?
CONVERT( UNSIGNED INT , :p1 )
-- %d
WHERE search_col = :p2
- there is no problem with datatype of numeric(9,0), or after embedding the value right in SQL string sans placeholder;
By way of crude, untested but representative code ...
# SQL.
create table pqr
(
x numeric(9,0) not null
, y unsigned int not null
)
insert into pqr values( 0 , 0 )
# Perl
$n = 1;
# Works.
$dbh->do( q/UPDATE pqr SET x = ?/ , undef , $n );
$n = 2;
# Fails;
$dbh->do( q/UPDATE pqr SET y = ?/ , undef , $n );
$n = 3;
# works (same as %s, this is all string in the end).
$dbh->do( sprintf q/UPDATE pqr SET y = %d/ , $n );