What does SimpleJDBCTemplate.queryForInt do when the database returns null?

What does SimpleJDBCTemplate.queryForInt do when the SQL query's actual result is null开发者_StackOverflow?

In particular, what happens if I run queryForInt("select max(foo) from f") and f has no rows?

While I'm on this subject, what happens if I run queryForInt("select foo from f") and f has no rows?

If the query returns null, the queryForInt method will return 0. However, if the query returns no rows, or returns more than one row, queryForInt will throw an IncorrectResultSizeDataAccessException.

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