Bug 285713: Cross-DB bz_column_info and bz_index_info

Patch By Max Kanat-Alexander <mkanat@kerio.com> r=Tomas.Kopal, a=justdave

webtools/bugzilla/Bugzilla/DB.pm

@@ -434,6 +434,19 @@ sub _bz_schema {
     return $self->{private_bz_schema};
 }
 
+sub bz_column_info {
+    my ($self, $table, $column) = @_;
+
+    return $self->_bz_real_schema->get_column_abstract($table, $column);
+}
+
+sub bz_index_info {
+    my ($self, $table, $index) = @_;
+
+    return $self->_bz_real_schema->get_index_abstract($table, $index);
+}
+
+
 # XXX - Needs to be made cross-db compatible.
 sub bz_get_field_def ($$) {
     my ($self, $table, $field) = @_;
@@ -709,6 +722,10 @@ Bugzilla::DB - Database access routines, using L<DBI>
   $dbh->bz_rename_field($table, $column, $newname);
 
   # Schema Information
+  my $column = $dbh->bz_column_info($table, $column);
+  my $index  = $dbh->bz_index_info($table, $index);
+
+  # Schema Information (DEPRECATED)
   my @fields    = $dbh->bz_get_field_defs();
   my @fieldinfo = $dbh->bz_get_field_def($table, $column);
   my @indexinfo = $dbh->bz_get_index_def($table, $field);
@@ -1038,9 +1055,43 @@ These methods modify the current Bugzilla schema.
               $newname = the new name of the column
  Returns:     none
 
+=back
+
+
 =head2 Schema Information Methods
 
-These methods return info about the current Bugzilla database schema.
+These methods return information about the current Bugzilla database
+schema, as it currently exists on the disk. 
+
+Where a parameter says "Abstract index/column definition", it returns/takes
+information in the formats defined for indexes and columns in
+C<Bugzilla::DB::Schema::ABSTRACT_SCHEMA>.
+
+=over 4
+
+=item C<bz_column_info($table, $column)>
+
+ Description: Get abstract column definition.
+ Params:      $table - The name of the table the column is in.
+              $column - The name of the column.
+ Returns:     An abstract column definition for that column.
+              If the table or column does not exist, we return undef.
+
+=item C<bz_index_info($table, $index)>
+
+ Description: Get abstract index definition.
+ Params:      $table - The table the index is on.
+              $index - The name of the index.
+ Returns:     An abstract index definition for that index.
+              If the index does not exist, we return undef.
+
+=back
+
+
+=head2 Deprecated Schema Information Methods
+
+These methods return info about the current Bugzilla database, for
+MySQL only.
 
 =over 4
 

webtools/bugzilla/Bugzilla/DB/Schema.pm

@@ -1167,9 +1167,9 @@ sub get_type_ddl {
 
 } #eosub--get_type_ddl
 #--------------------------------------------------------------------------
-sub get_column_info {
+sub get_column_ddl {
 
-=item C<get_column_info>
+=item C<get_column_ddl>
 
  Description: Public method to generate a DDL segment of a "create table"
               SQL statement for a given table and field.
@@ -1192,7 +1192,7 @@ sub get_column_info {
     return() unless ($fields{$column});
     return %{ $fields{$column} };
 
-} #eosub--get_column_info
+} #eosub--get_column_ddl
 #--------------------------------------------------------------------------
 sub get_table_list {
 
@@ -1348,7 +1348,52 @@ sub _get_create_index_ddl {
 
 } #eosub--_get_create_index_ddl
 #--------------------------------------------------------------------------
+sub get_column_abstract {
 
+=item C<get_column_abstract($table, $column)>
+
+ Description: A column definition from the abstract internal schema.
+              cross-database format.
+ Params:      $table - The name of the table
+              $column - The name of the column that you want
+ Returns:     A hash reference. For the format, see the docs for
+              C<ABSTRACT_SCHEMA>.
+              Returns undef if the column or table does not exist.
+
+=cut
+
+    my ($self, $table, $column) = @_;
+
+    # Prevent a possible dereferencing of an undef hash, if the
+    # table doesn't exist.
+    if (exists $self->{abstract_schema}->{$table}) {
+        return $self->{abstract_schema}->{$table}{FIELDS}{$column};
+    }
+    return undef;
+}
+
+sub get_index_abstract {
+
+=item C<get_index_abstract($table, $index)
+
+ Description: Returns an index definition from the internal abstract schema.
+ Params:      $table - The table the index is on.
+              $index - The name of the index.
+ Returns:     A hash reference representing an index definition.
+              See the C<ABSTRACT_SCHEMA> docs for details.
+              Returns undef if the index does not exist.
+
+=cut
+
+    my ($self, $table, $index) = @_;
+
+    # Prevent a possible dereferencing of an undef hash, if the
+    # table doesn't exist.
+    if (exists $self->{abstract_schema}->{$table}) {
+        return $self->{abstract_schema}->{$table}{INDEXES}{$index};
+    }
+    return undef;
+}
 
 
 =head1 SERIALIZATION/DESERIALIZATION