Java 7 Automatic Resource Management JDBC (try-with-resources statement)

Question

How to integrate the common JDBC idiom of creating/receiving a connection, querying the database and possibly processing the results with Java 7\'s automatic resource manage

Answer 1

If you want to use pooled connection in transaction, you should use it in this way:

try (Connection conn = source.getConnection()) {
        conn.setAutoCommit(false);
        SQLException savedException = null;
        try {
            // Do things with connection in transaction here...
            conn.commit();
        } catch (SQLException ex) {
            savedException = ex;
            conn.rollback();
        } finally {
            conn.setAutoCommit(true);
            if(savedException != null) {
                throw savedException;
            }
        }
    } catch (SQLException ex1) {
        throw new DataManagerException(ex1);
    }

This sample code handles setting autocommit values.

NOTE, that using savedException does save exception in case that conn.rollback() throws another. This way, finally block will throw "right" exception.