ResultSet How to get String from an object when data is null?

Question

In my Oracle table there are columns with different type.
I want to read all columns as number.

String str = resultSet.getString("col1");

The problem is that if column in database is defined as number, and value is

0.5

the returned string will be

.5

I can not use any other getter like getDecimal() and etc.

If I use:

String str = resultSet.getObject("col1").toString(); 

I'll get an exception if the value is null.

Answer 1

You could use

String str = String.valueOf(resultSet.getObject("col1"));

as a simple workaround to avoid any exceptions. (Not sure why you can't use resultSet.getDouble("col1") though.)

Answer 2

If you don't want to see an empty string rather than the literal "null" for a null value (which is what String.valueOf() ) will produce, you can use:

Object value = resultSet.getObject("col1")
String str = value == null ? "" : value.toString();