in reply to DBI Error Trapping

Setting 'RaiseError' to 1 means 'die if there is an error'. You have two choices: eval the prepare statement and then check $@ after the prepare, or set RaiseError to 0 and check the status returned from the prepare statement.

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Re: Re: DBI Error Trapping
by timo (Novice) on Dec 19, 2001 at 11:43 UTC
    I've changed it to: 
    $db3->{RaiseError}=0;
        unless ($sth_minus = $db3->prepare_cached("
                                            SELECT $column_list FROM $
+database_user_1.$table_names_r->[0]".'@'."$config{database_dblink_1}
                                            MINUS
                                            SELECT $column_list FROM $
+database_user_2.$table_names_r->[0]".'@'."$config{database_dblink_2}
                                         "))
               {warn $@ if $@;}

    [download]
    but the program still dies. Any suggestions?
[reply]
[d/l]
      Try something like:
      {
  local $db3->{RaiseError}=0;
  $sth_minus = $db3->prepare_cached("
       SELECT $column_list FROM $database_user_1.$table_names_r->[0]".
+'@'."$config{database_dblink_1}
       MINUS
       SELECT $column_list FROM $database_user_2.$table_names_r->[0]".
+'@'."$config{database_dblink_2}
  ");
  warn "prepare fails with $db3->errstr" if $db3->err;
}

      [download]
      The errorcode is returned in $db3->err and the string in $db3->errstr not in $@.

      Localising $db3->{RaiseError} is a way of locally setting the RaiseError attribute without having to rembember the state (probably not needed here, but it is a useful idiom :-).

[reply]
[d/l]
      The error string will be in $@ if you set RaiseError to 1 AND eval the prepare statement. Or do what htoug suggests above. Sorry if I was unclear :)
[reply]

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