Question

I am trying to retrieve generated keys from an executeBatch() transaction but I only get the last key to be added.

this is my code:

        PreparedStatement ps_insert = conn.prepareStatement(insertQuery, PreparedStatement.RETURN_GENERATED_KEYS);          
        for (int i = 0 ; i < adding_dates.length ; i++){
            ps_insert.setInt(1, Integer.parseInt(consultant_id));
            ps_insert.setDate(2, adding_dates[i]);
            ps_insert.setInt(3, Integer.parseInt(room_id));
            ps_insert.addBatch();
        }
        ps_insert.executeBatch();
        ResultSet rs = ps_insert.getGeneratedKeys(); //<-- Only the last key retrieved
        conn.commit();          

What am I doing wrong?

EDIT: Apologies for not mentioning that I use H2 (http://www.h2database.com/html/main.html) database in embedded mode.

Answer 1

According to H2 jdbc driver javadocs, this is the normal behaviour:

Return a result set that contains the last generated auto-increment
key for this connection, if there was one. If no key was generated by
the last modification statement, then an empty result set is returned.
The returned result set only contains the data for the very last row.