fig15_22.pl

PERL语言资料 可以用于PERL程序设计

#!/usr/bin/perl
# Fig. 15.22: fig15_22.pl
# Program to update a record in the database.

use warnings;
use strict;
use DBI;
use DBD::ODBC;

my $dbh = DBI->connect( "dbi:ODBC:employeeDB", "", "", 
                        { RaiseError => 1 } );
 
print( "Enter the Employee ID number of the record ",
       "you wish to change: " ); 

chomp( my $ID = <STDIN> );

print( "Which value would you like to change:\n" );
print( "1. Employee Identification. \n" );
print( "2. First name.\n" );
print( "3. Last name.\n" );
print( "4. Year of Birth.\n" );
print( "5. Social Security Number.\n" );
print( "? " );
chomp( my $change = <STDIN> );   

my $field;

if ( $change == 1 ) {
   $field = "EmployeeID";
   print( "Enter the employee's new employee number: " );
}
elsif ( $change == 2 ) {
   $field = "FirstName";
   print( "Enter the employee's new First name: " );
}
elsif ( $change == 3 ) {
   $field = "LastName";
   print( "Enter the employee's new Last name: " );
}
elsif ( $change == 4 ) {
   $field = "YearBorn";
   print( "Enter the employee's new year of birth: " );
}
elsif ( $change == 5 ) {
   $field = "SocialSecurity";
   print( "Enter the employee's new social security number: " );
} 
else {
   print( "Invalid value.\n" ); 
   return; 
}

chomp( my $newvalue = <STDIN> );
my $query = "UPDATE employee SET $field = " . 
            " '$newvalue' WHERE EmployeeID = '$ID'";
   
print( "$query \n" );
$dbh->do( $query );

# Now print the updated database
my $sth = $dbh->prepare( q{ SELECT * FROM employee  } );

$sth->execute();

print( "\n" );
my @array;

while ( @array = $sth->fetchrow_array() ) {
   write();
}

# Clean up
warn( $DBI::errstr ) if $DBI::err;
$sth->finish();
$dbh->disconnect();

format STDOUT = 
@<<<<<<@<<<<<<<<<@<<<<<<<<<<@<<<<<@<<<<<<<<<<<
$array[ 0 ], $array[ 1 ], $array[ 2 ], $array[ 3 ], $array[ 4 ]
.

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