X-Git-Url: http://git.shadowcat.co.uk/gitweb/gitweb.cgi?a=blobdiff_plain;f=lib%2FAnyDBM_File.pm;h=9cf9b3183434156ec8d464bbe2c01f95591bbcc2;hb=9426adcd48655815b65cea5a9f1eebbe7e23a9df;hp=50acce412a47cd98c2c5f4a88f575eace24240b4;hpb=f06db76b9e41859439aeadb79feb6c603ee741ff;p=p5sagit%2Fp5-mst-13.2.git

diff --git a/lib/AnyDBM_File.pm b/lib/AnyDBM_File.pm
index 50acce4..9cf9b31 100644
--- a/lib/AnyDBM_File.pm
+++ b/lib/AnyDBM_File.pm
@@ -1,18 +1,24 @@
 package AnyDBM_File;
 
+use vars qw(@ISA);
 @ISA = qw(NDBM_File DB_File GDBM_File SDBM_File ODBM_File) unless @ISA;
 
-eval { require NDBM_File } ||
-eval { require DB_File } ||
-eval { require GDBM_File } ||
-eval { require SDBM_File } ||
-eval { require ODBM_File };
+my $mod;
+for $mod (@ISA) {
+    if (eval "require $mod") {
+	@ISA = ($mod);	# if we leave @ISA alone, warnings abound
+	return 1;
+    }
+}
+
+die "No DBM package was successfully found or installed";
+#return 0;
 
 =head1 NAME
 
 AnyDBM_File - provide framework for multiple DBMs
 
-NDBM_File, ODBM_File, SDBM_File, GDBM_File - various DBM implementations
+NDBM_File, DB_File, GDBM_File, SDBM_File, ODBM_File - various DBM implementations
 
 =head1 SYNOPSIS
 
@@ -27,20 +33,14 @@ L<DB_File>), GDBM, SDBM (which is always there--it comes with Perl), and
 finally ODBM.   This way old programs that used to use NDBM via dbmopen()
 can still do so, but new ones can reorder @ISA:
 
-    @AnyDBM_File::ISA = qw(DB_File GDBM_File NDBM_File);
-
-Note, however, that an explicit use overrides the specified order:
-
-    use GDBM_File;
-    @AnyDBM_File::ISA = qw(DB_File GDBM_File NDBM_File);
-
-will only find GDBM_File.
+    BEGIN { @AnyDBM_File::ISA = qw(DB_File GDBM_File NDBM_File) }
+    use AnyDBM_File;
 
 Having multiple DBM implementations makes it trivial to copy database formats:
 
     use POSIX; use NDBM_File; use DB_File;
-    tie %newhash,  DB_File, $new_filename, O_CREAT|O_RDWR;
-    tie %oldhash,  NDBM_File, $old_filename, 1, 0;
+    tie %newhash,  'DB_File', $new_filename, O_CREAT|O_RDWR;
+    tie %oldhash,  'NDBM_File', $old_filename, 1, 0;
     %newhash = %oldhash;
 
 =head2 DBM Comparisons
@@ -87,6 +87,6 @@ By default, but can be redefined.
 
 =head1 SEE ALSO
 
-dbm(3), ndbm(3), DB_File(3)
+dbm(3), ndbm(3), DB_File(3), L<perldbmfilter>
 
 =cut