Anonymous Monk has asked for the wisdom of the Perl Monks concerning the following question:
Do placeholders work in SET clause of UPDATE query for column datatype of UNSIGNED INT in ASE 15.7+?
- 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 );