完善mock和测试

git-svn-id: http://code.alibabatech.com/svn/druid/trunk@778 b9813039-fb51-4c41-a8b9-e21c2acb5095

src/main/java/com/alibaba/druid/mock/MockResultSet.java

@@ -714,8 +714,7 @@ public class MockResultSet implements ResultSet {
 
     @Override
     public Object getObject(int columnIndex, Map<String, Class<?>> map) throws SQLException {
-
-        return null;
+        return getObject(columnIndex);
     }
 
     @Override
@@ -735,8 +734,7 @@ public class MockResultSet implements ResultSet {
 
     @Override
     public Array getArray(int columnIndex) throws SQLException {
-
-        return null;
+        return (Array) getObject(columnIndex);
     }
 
     @Override