Question

Please I am having problem tracking down the problem with this code I have been trying for hours . it gives me the error DBD::mysql::st fetchrow_hashref failed: fetch() without execute() at line 15

        sub Split_Into_Words
        {
            #### Connection parameters ############################
            my $dsn =  "dbi:mysql:malware:localhost:3306";
            my $user = 'root';
            my $passwd = 'sxxxs';
            ########################################################
            my $domain ;
            my $countDir = 0 ;
            my $file = shift ;
            my $labelID  =  (split(/[.]/ , $file))[1] ; ### Split and get the middle value since format is temporay.

            #### Query String ############################################################################
             my $InsertIntoHostTable_QS  = "INSERT INTO TB_host(HostName  , UrlID , ExtID) Values (? , ? , ? ) ; ";
             my $InsertIntoDomainTable_QS = "INSERT IGNORE INTO  TB_Domain(Domain) values (?) ;" ;
             my $InsertIntoArgVal_QS = "INSERT INTO TB_Arg_Value(Arg, URL_ID)  VALUES (?  , ? ) ; " ; 
             my $InsertIntoDirectory_QS = "INSERT INTO TB_Directory(DIRNAME , DEPTH , URLID) VALUES (? , ? , ? )" ;
             my $InsertIntoExtension_QS = "INSERT IGNORE INTO TB_Extension (Extension) values ( ? ) ; ";
             my $InsertIntoExtensionNULL_QS =   "INSERT IGNORE INTO TB_Extension (ID , Extension) values (? , ? )  ; ";
             my $SelectString  = " Select URL , ID  from TB_URL where LabelID = '"  .  $labelID."';";
             my $InsertIntoFileName_QS  = "INSERT IGNORE INTO TB_FileName( filename)  VALUES (?) ; " ; 

             ###################################################################################################
             my $DBIConnect = DBI->connect($dsn , $user , $passwd) or die("Cannot connect to datadbase  $DBI::errstr\n");   


            print ("Splitting Into Words \n");


            ######Initialization of a default DB value #################
            my $sth =  $DBIConnect->prepare( $InsertIntoExtensionNULL_QS);
                    $sth->execute(1 , 'null') or die("Error Executing the Insertion" . $sth->errstr );
                    $sth->finish();
            #############################################################
            $sth =  $DBIConnect ->prepare($SelectString);
            sleep(10);
            open (FH , '<' , $file); # Open file to be read from disk

            my $i = 0;
            $sth->execute() or die("Error Executing the Insertion" . $sth->errstr );

   ->line 15        while(my $hash_ref = $sth->fetchrow_hashref )
            {
                    my $extensionID = "1";
                    my $intialURL =  $hash_ref->{URL} ;

                my $initialID = $hash_ref->{ID};
    }
    }

Answer 1

I’m not sure if this is the issue, but you may not need the finish after the insert. From the DBI doc:

Indicate that no more data will be fetched from this statement handle
before it is either executed again or destroyed. You almost certainly
do not need to call this method.

Adding calls to finish after loop that fetches all rows is a common
mistake, don’t do it, it can mask genuine problems like uncaught fetch
errors.

If that is the problem, you may want to create a second statement handler for the select call.