Support getObject(?, Class) in generated keys

The ResultSet returned by Statement#getGeneratedKeys() does not support
getObject(int|String, Class) unlike a normal ResultSet which does.

h2/src/main/org/h2/tools/SimpleResultSet.java

@@ -843,25 +843,67 @@ public class SimpleResultSet implements ResultSet, ResultSetMetaData,
     }
 
     /**
-     * INTERNAL
+     * Returns the value as an Object of the specified type.
      *
      * @param columnIndex the column index (1, 2, ...)
      * @param type the class of the returned value
      */
     @Override
     public <T> T getObject(int columnIndex, Class<T> type) throws SQLException {
-        throw getUnsupportedException();
+        if (wasNull()) {
+            return null;
+        }
+
+        if (type == BigDecimal.class) {
+            return type.cast(getBigDecimal(columnIndex));
+        } else if (type == BigInteger.class) {
+            return type.cast(getBigDecimal(columnIndex).toBigInteger());
+        } else if (type == String.class) {
+            return type.cast(getString(columnIndex));
+        } else if (type == Boolean.class) {
+            return type.cast(getBoolean(columnIndex));
+        } else if (type == Byte.class) {
+            return type.cast(getByte(columnIndex));
+        } else if (type == Short.class) {
+            return type.cast(getShort(columnIndex));
+        } else if (type == Integer.class) {
+            return type.cast(getInt(columnIndex));
+        } else if (type == Long.class) {
+            return type.cast(getLong(columnIndex));
+        } else if (type == Float.class) {
+            return type.cast(getFloat(columnIndex));
+        } else if (type == Double.class) {
+            return type.cast(getDouble(columnIndex));
+        } else if (type == Date.class) {
+            return type.cast(getDate(columnIndex));
+        } else if (type == Time.class) {
+            return type.cast(getTime(columnIndex));
+        } else if (type == Timestamp.class) {
+            return type.cast(getTimestamp(columnIndex));
+        } else if (type == UUID.class) {
+            return type.cast(getObject(columnIndex));
+        } else if (type == byte[].class) {
+            return type.cast(getBytes(columnIndex));
+        } else if (type == java.sql.Array.class) {
+            return type.cast(getArray(columnIndex));
+        } else if (type == Blob.class) {
+            return type.cast(getBlob(columnIndex));
+        } else if (type == Clob.class) {
+            return type.cast(getClob(columnIndex));
+        } else {
+            throw getUnsupportedException();
+        }
     }
 
     /**
-     * INTERNAL
+     * Returns the value as an Object of the specified type.
      *
      * @param columnName the column name
      * @param type the class of the returned value
      */
     @Override
     public <T> T getObject(String columnName, Class<T> type) throws SQLException {
-        throw getUnsupportedException();
+        return getObject(findColumn(columnName), type);
     }
 
     /**

h2/src/test/org/h2/test/jdbc/TestGetGeneratedKeys.java

@@ -452,11 +452,28 @@ public class TestGetGeneratedKeys extends TestBase {
         Statement stat = conn.createStatement();
         stat.execute("CREATE TABLE TEST (ID BIGINT PRIMARY KEY AUTO_INCREMENT,"
                 + "UID UUID NOT NULL DEFAULT RANDOM_UUID(), VALUE INT NOT NULL)");
-        PreparedStatement prep = conn.prepareStatement("INSERT INTO TEST(VALUE) VALUES (10)");
+        PreparedStatement prep = conn.prepareStatement("INSERT INTO TEST(VALUE) VALUES (10)", Statement.RETURN_GENERATED_KEYS);
         prep.addBatch();
         prep.addBatch();
         prep.executeBatch();
         ResultSet rs = prep.getGeneratedKeys();
+
+        assertTrue(rs.next());
+        assertEquals(1L, rs.getLong(1));
+        assertEquals(1L, rs.getLong("ID"));
+        assertEquals(Long.valueOf(1L), rs.getObject(1, Long.class));
+        assertEquals(Long.valueOf(1L), rs.getObject("ID", Long.class));
+        assertTrue(rs.getObject(2) instanceof UUID);
+        assertTrue(rs.getObject("UID") instanceof UUID);
+        assertTrue(rs.getObject("UID", UUID.class) instanceof UUID);
+
+        assertTrue(rs.next());
+        assertEquals(2L, rs.getLong(1));
+        assertEquals(2L, rs.getLong("ID"));
+        assertTrue(rs.getObject(2) instanceof UUID);
+        assertTrue(rs.getObject("UID") instanceof UUID);
+        assertTrue(rs.getObject("UID", UUID.class) instanceof UUID);
+
         assertFalse(rs.next());
         rs.close();
         stat.execute("DROP TABLE TEST");