?
Solved

Printing result Perl?

Posted on 2003-12-09
4
Medium Priority
?
733 Views
Last Modified: 2013-12-25
how do i get perl to display rthe result of the sql:
 $uidpwd = $FORM{'username'}."/".$FORM{'password'};
   $stuid = " select spid,surname,forename,userid,faccode,course,slotday,tpid" .
          " from diz.students" .
          " where spid='" .
          $FORM{'id'} ."';";

I want to display the results of '$stuid' but when i use the 'PRINT' function it just displays the sql formula and not the result of the sql help!!
0
Comment
Question by:boffer
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
4 Comments
 
LVL 3

Accepted Solution

by:
mrh30 earned 100 total points
ID: 9904791
You will need to actually run the SQL query.  This will probably mean:

use DBI;  #Or whatever you're using

## You need to set up the variables you need here

my $dbh = DBI->Connect("DBI:mysql:database=".$db_name.";host=".$db_host, $db_user, $db_pass)
                      or die "Cannot connect to database";

print $dbh->selectrow_array(" ... your sql here ... ");
0
 
LVL 5

Assisted Solution

by:djplaistow
djplaistow earned 100 total points
ID: 9905743
Try this subroutine; the sub prolog has example usage. It relies on some global variables, so be sure they are set.

################################################################################
# Author:  Don Plaistow
# Purpose: This function will execute an arbitrary number of SQL queries on
#          the database specified in the first argument. If any of the queries
#          are a select, then a reference to an array of hashes will be returned.
#          Here is an example of executing a select statement:
#
#              my $sql = qq[SELECT * from myTable;];
#              my $raRows = Sql($dbName, $sql);
#              # Get the value from the first row of the column named "Id"
#              my $firstRowId = $raRows->[0]->{Id};
#              
#              # Loop through all the rows in the data set printing the value of
#              # the column named "Id" for every row
#              foreach my $rhRow (@$raRows)
#              {
#                print "$rhRow->{Id} \n";
#              }
#
# Arguments: $dbName: the database name
#            $sqlStatement: A valid SQL statement
# Global variables:
#             $host: The database host computer
#         $dbUser: The database user name to use for the connection to the DB
# $dbPassword: The password required for the user specified in $dbUser
#    $debugging: Set true if debugging data is desired
#       $debugDir: The directory where the debug text file,
#                          db_executeSQLStatement.txt, will be stored.
################################################################################
sub Sql
{
  my $dbName = shift(@_);
  my $sql = "";
  my $status = "1";
  my @rowArray = ();

  if (my $db = DBI->connect("dbi:mysql:$dbName:$host", $dbUser, $dbPassword, {PrintError => 0, RaiseError => 0}))
  {
    # The remaining function arguments should be valid SQL statements, so execute them
    # until there are no more.
    while (@_)
    {
      $sql = shift(@_);
      # If the query has any whitespace after the closing ';' it might fail
      # TODO: This might not be a problem.
      $sql =~ s/;\s*$/;/;

      if (my $sth = $db->prepare($sql))
      {
        if ($sth->execute())
        {
          # If the SQL statement was a select, then push a reference to the
          # results hash into an array so it can be returned to the caller
          if ($sql =~ m/^\s*select/io)
          {
            while(my $hashRef = $sth->fetchrow_hashref())
            { push (@rowArray, $hashRef); }
          }
        }
        else { $status = "ERROR: Can't execute sql statement: $sql\n\n $DBI::errstr\n";}
      }
      else { $status = "ERROR: Can't prepare sql statement: $sql\n\n $DBI::errstr\n";}
    }
    if (!$db->disconnect)
    { $status = "ERROR: disconnecting: $DBI::errstr\n";}
  }
  else
  { $status = "ERROR: Can't connect to database $DBI::errstr\n";}
   
  if(($debugging == 1) && ($status ne "1"))
  {
    open (DB_FILE, ">$debugDir/db_executeSQLStatement.txt");
    print DB_FILE "$sql\n";
    foreach my $rowHash (@rowArray)
    {
      print DB_FILE "*******************  ROW DATA  ************************\n";
      foreach $field (keys %$rowHash)
      { print DB_FILE "$field = $rowHash->{$field}\n"; }
    }
    print DB_FILE "status: $status";
    close(DB_FILE);
  }

  # If there was a problem and it wasn't just a blank database name
  if (($status ne "1") && ($dbName !~ m/^\s*$/))
  {
    my $envs = "";
    foreach $var (sort(keys(%ENV)))
    {
      $val = $ENV{$var};
      $val =~ s|\n|\\n|g;
      $val =~ s|"|\\"|g;
      $envs .= "${var}=\"${val}\"\n";
    }
    if ($sql eq "") { foreach $arg (@_) { $sql .= "$arg\n"; } }
    print "Content-type: text/html\n\n";
    print "<pre>Testing: Error during SQL call.\nDB: $dbName\nSQL: $sql\nStatus: $status\n ENVS:\n $envs";
  }

  # If at least one of the queries was a select, then there should be values in
  # the array that need to be returned. Otherwise, just return the
  if (@rowArray) { return(\@rowArray); }
  else           { return($status); }
} # end of Sql
0

Featured Post

Enroll in August's Course of the Month

August's CompTIA IT Fundamentals course includes 19 hours of basic computer principle modules and prepares you for the certification exam. It's free for Premium Members, Team Accounts, and Qualified Experts!

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

If you get a (Blue Screen of Death), your system writes a small file called a minidump. Your first step is to make certain your computer is setup to record memory dumps. Right click My Computer, choose properties. Click on the advanced tab, an…
It is becoming increasingly popular to have a front-page slider on a web site. Nearly every TV website,  magazine or online news has one on their site, and even some e-commerce sites have one. Today you can use sliders with Joomla, WordPress or …
Learn the basics of while and for loops in Python.  while loops are used for testing while, or until, a condition is met: The structure of a while loop is as follows:     while <condition>:         do something         repeate: The break statement m…
In this fifth video of the Xpdf series, we discuss and demonstrate the PDFdetach utility, which is able to list and, more importantly, extract attachments that are embedded in PDF files. It does this via a command line interface, making it suitable …
Suggested Courses

764 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question