Is there a way to retrieve the autoincrement ID from a prepared statement

Question

Is there a way to retrieve the auto generated key from a DB query when using a java query with prepared statements.

For example, I know AutoGeneratedKeys can work as follows.

stmt = conn.createStatement();  stmt.executeUpdate(sql, Statement.RETURN_GENERATED_KEYS); if(returnLastInsertId) {     ResultSet rs = stmt.getGeneratedKeys();     rs.next();     auto_id = rs.getInt(1); }  

However. What if I want to do an insert with a prepared Statement.

String sql = "INSERT INTO table (column1, column2) values(?, ?)"; stmt = conn.prepareStatement(sql);  //this is an error stmt.executeUpdate(Statement.RETURN_GENERATED_KEYS); if(returnLastInsertId) {     //this is an error since the above is an error     ResultSet rs = stmt.getGeneratedKeys();     rs.next();     auto_id = rs.getInt(1); }  

Is there a way to do this that I don't know about. It seems from the javadoc that PreparedStatements can't return the Auto Generated ID.

Answer 1

Yes. See here. Section 7.1.9. Change your code to:

String sql = "INSERT INTO table (column1, column2) values(?, ?)"; stmt = conn.prepareStatement(sql, Statement.RETURN_GENERATED_KEYS);   stmt.executeUpdate(); if(returnLastInsertId) {    ResultSet rs = stmt.getGeneratedKeys();     rs.next();    auto_id = rs.getInt(1); } 

Answer 2

There's a couple of ways, and it seems different jdbc drivers handles things a bit different, or not at all in some cases(some will only give you autogenerated primary keys, not other columns) but the basic forms are

stmt = conn.prepareStatement(sql, Statement.RETURN_GENERATED_KEYS);  

Or use this form:

String autogenColumns[] = {"column1","column2"}; stmt = conn.prepareStatement(sql, autogenColumns)