The getPrimaryKeys method uses the "Key_name" to determine if a column is a
primary key column. My primary key name is of the form XXX_PK, so neither 3.1.0
alpha nor 3.0.9 stable will return my key column.

String keyType = rs.getString("Key_name");

3.1.0 alpha if (keyType.toUpperCase().startsWith("PRI")) { 3.0.9 stable if (keyType.equalsIgnoreCase("PRIMARY") || keyType.equalsIgnoreCase("PRI")) {