X-Git-Url: http://git.shadowcat.co.uk/gitweb/gitweb.cgi?a=blobdiff_plain;f=lib%2FDBIx%2FClass%2FStorage%2FDBI%2FOracle%2FGeneric.pm;h=5ed31a049e61137a07a3ec91519a56bac105f391;hb=af0edca1cb4cc086f70fb81e9c1955230346691a;hp=2b62826caae9fb9c079f9253f7631c2843e67289;hpb=d88ecca6486a2b1c4b6e2f0440165b186aab39bc;p=dbsrgits%2FDBIx-Class.git

diff --git a/lib/DBIx/Class/Storage/DBI/Oracle/Generic.pm b/lib/DBIx/Class/Storage/DBI/Oracle/Generic.pm
index 2b62826..5ed31a0 100644
--- a/lib/DBIx/Class/Storage/DBI/Oracle/Generic.pm
+++ b/lib/DBIx/Class/Storage/DBI/Oracle/Generic.pm
@@ -17,7 +17,9 @@ DBIx::Class::Storage::DBI::Oracle::Generic - Oracle Support for DBIx::Class
 
 =head1 DESCRIPTION
 
-This class implements autoincrements for Oracle.
+This class implements base Oracle support. The subclass
+L<DBIx::Class::Storage::DBI::Oracle::WhereJoins> is for C<(+)> joins in Oracle
+versions before 9.
 
 =head1 METHODS
 
@@ -274,6 +276,40 @@ sub _svp_rollback {
     $self->_get_dbh->do("ROLLBACK TO SAVEPOINT $name")
 }
 
+=head2 relname_to_table_alias
+
+L<DBIx::Class> uses L<DBIx::Class::Relationship> names as table aliases in
+queries.
+
+Unfortunately, Oracle doesn't support identifiers over 30 chars in length, so
+the L<DBIx::Class::Relationship> name is shortened and appended with half of an
+MD5 hash.
+
+See L<DBIx::Class::Storage/"relname_to_table_alias">.
+
+=cut
+
+sub relname_to_table_alias {
+  my $self = shift;
+  my ($relname, $join_count) = @_;
+
+  my $alias = $self->next::method(@_);
+
+  return $alias if length($alias) <= 30;
+
+  # get a base64 md5 of the alias with join_count
+  require Digest::MD5;
+  my $ctx = Digest::MD5->new;
+  $ctx->add($alias);
+  my $md5 = $ctx->b64digest;
+
+  # truncate and prepend to truncated relname without vowels
+  (my $devoweled = $relname) =~ s/[aeiou]//g;
+  my $res = substr($devoweled, 0, 18) . '_' . substr($md5, 0, 11);
+
+  return $res;
+}
+
 =head1 AUTHOR
 
 See L<DBIx::Class/CONTRIBUTORS>.