Adding a row with columns that have sequenced primary and foreign key JDBC

Question

My program has an add item and finish transaction option. The FinishTransaction class asks the user to input the customer\'s information, meth

Answer 1

I'm pretty sure that this sql insert statement is incorrect.

String sql3 = "INSERT INTO TRANSACTION " + 
                        "VALUES(TransNumSeq.NEXTVAL,  CustNumSeq.NEXTVAL, ?, ?)";

You're inserting a record into TRANSACTION and trying to advance the sequence on CUSTOMER (CustNumSeq.NEXTVAL) . You should try to use

//when inserting into CUSTOMER 
pstmt=conn.prepareStatement(sql,Statement.RETURN_GENERATED_KEYS);
pstmt.execute();//make the insert
//and then simply grab the key
ResultSet rs = stmt.getGeneratedKeys();
if (rs.next()) 
id = rs.getObject(1);

Note that not every JDBC driver supports returning generated keys so you may have to use one additional select to fetch the last generated key.

And finally, you will have to change this part to reflect the changes made above

String sql3 = "INSERT INTO TRANSACTION " + 
                        "VALUES(TransNumSeq.NEXTVAL, ?, ?, ?, ?, ?)";
pstmt3 = conn.prepareStatement(sql3);
pstmt3.setInt(1, id);
pstmt3.setInt(2, payment);
pstmt3.setString(3, payment_desc);
pstmt3.setInt(4, creditCard);
pstmt3.setInt(5, change);