Jdbctemplate query for string: EmptyResultDataAccessException: Incorrect result size: expected 1, actual 0

Question

I am using Jdbctemplate to retrieve a single String value from the db. Here is my method.

    public String test() {
        String cert=null;
        Strin         


        

Answer 1

In Postgres, you can make almost any single value query return a value or null by wrapping it:

SELECT (SELECT ) AS value

and hence avoid complexity in the caller.