perl (word by word check if a hash key)


 
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Old 01-08-2010
perl (word by word check if a hash key)

Hi,
Now i work in a code that
1-get data stored in the database in the form of hash table with a key
field which is the " Name"
2-in the same time i open a txt file and loop through it word by word
3- which i have a problem in is that :

I need to loop word by word and check if it is a hash key or not if a hash key print it .

Code:
#!/usr/bin/perl
 
 use DBI; 
 
       $sqlstatement= "select Name from Protein;"; 
 
    #open connection to Access database 
    $dbh = DBI->connect('dbi:ODBC:driver=microsoft access driver (*.mdb);dbq=C:\Perl\eg\db1.mdb'); 
 
    #prepare and execute SQL statement 
 
    $sth = $dbh->prepare($sqlstatement); 
    $sth->execute || 
    die "Could not execute SQL statement ... maybe invalid?"; 
 
 
    #output database results 
 
    while ( $ref = $sth->fetchrow_hashref($Name) ) 
{
    print "$$ref{'Name'} \n";
}
 
 
$filename= 'C:/Perl/eg/members.txt';
open (FILE,$filename) or die $!;
while (<FILE>){
# split each input line; words are separated by whitespace
  for $word (split)
  {
   print $word . "\n";
  }
}
close (FILE);

The code now can only print the hash returned from the database
and split the txt into words.
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Tie::SubstrHash(3pm)					 Perl Programmers Reference Guide				      Tie::SubstrHash(3pm)

NAME
Tie::SubstrHash - Fixed-table-size, fixed-key-length hashing SYNOPSIS
require Tie::SubstrHash; tie %myhash, 'Tie::SubstrHash', $key_len, $value_len, $table_size; DESCRIPTION
The Tie::SubstrHash package provides a hash-table-like interface to an array of determinate size, with constant key size and record size. Upon tying a new hash to this package, the developer must specify the size of the keys that will be used, the size of the value fields that the keys will index, and the size of the overall table (in terms of key-value pairs, not size in hard memory). These values will not change for the duration of the tied hash. The newly-allocated hash table may now have data stored and retrieved. Efforts to store more than $table_size elements will result in a fatal error, as will efforts to store a value not exactly $value_len characters in length, or reference through a key not exactly $key_len characters in length. While these constraints may seem excessive, the result is a hash table using much less internal memory than an equivalent freely-allocated hash table. CAVEATS
Because the current implementation uses the table and key sizes for the hashing algorithm, there is no means by which to dynamically change the value of any of the initialization parameters. The hash does not support exists(). perl v5.18.2 2013-11-04 Tie::SubstrHash(3pm)