Initial commit.

lib/perl5/Selima/NewSN.pm

@@ -0,0 +1,92 @@
+# Selima Website Content Management System
+# NewSN.pm: The new S/N generator.
+
+#  Copyright (c) 2003-2018 imacat.
+#
+#  Licensed under the Apache License, Version 2.0 (the "License");
+#  you may not use this file except in compliance with the License.
+#  You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+#  Unless required by applicable law or agreed to in writing, software
+#  distributed under the License is distributed on an "AS IS" BASIS,
+#  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+#  See the License for the specific language governing permissions and
+#  limitations under the License.
+
+# Author: imacat <imacat@mail.imacat.idv.tw>
+# First written: 2003-04-03
+
+package Selima::NewSN;
+use 5.008;
+use strict;
+use warnings;
+use base qw(Exporter);
+use vars qw(@EXPORT @EXPORT_OK);
+BEGIN {
+@EXPORT = qw(newsn newsn_hash newsn_xmltab);
+@EXPORT_OK = @EXPORT;
+# Prototype declaration
+sub newsn($);
+sub newsn_hash(%);
+sub newsn_xmltab($);
+}
+
+use Selima::DataVars qw($DBH);
+
+use constant SN_LEN => 9;
+
+# The relevent variables
+use vars qw($MIN $MAX $INT);
+$MIN = 10 ** (SN_LEN - 1);     # 100000000
+$MAX = (10 ** SN_LEN) - 1;     # 999999999
+$INT = $MAX - $MIN + 1;
+
+# newsn: Generate a new random serial number for a database table
+sub newsn($) {
+    local ($_, %_);
+    my ($table, $sth, $sql);
+    $table = $_[0];
+    
+    do {
+        # Generate a random serial number
+        $_ = $MIN + int rand $INT;
+        # Check if this serial number exists
+        $sql = "SELECT sn FROM $table WHERE sn=$_;\n";
+        $sth = $DBH->prepare($sql);
+        $sth->execute;
+    } until $sth->rows == 0;
+    
+    return $_;
+}
+
+# newsn_hash: Generate a new random serial number
+sub newsn_hash(%) {
+    local ($_, %_);
+    my %SN = @_;
+    
+    do {
+        # Generate a random serial number
+        $_ = $MIN + int rand $INT;
+    } until !exists $SN{$_};
+    
+    return $_;
+}
+
+# newsn_xmltab: Generate a new random serial number
+sub newsn_xmltab($) {
+    local ($_, %_);
+    my $SN = $_[0];
+    
+    do {
+        # Generate a random serial number
+        $_ = $MIN + int rand $INT;
+    } until !exists ${$SN}{$_};
+    
+    ${$SN}{$_} = (keys %{$SN});
+    
+    return $_;
+}
+
+return 1;