Converting simple statements to prepared statements...

Question

hi all,
how can i convert this update statement to a prepared statement...?
// this will append 'newData'
// to the current value of colName
UPDATE table
SET colName = colName + 'newData'
WHERE colID = 1
// i tried using this, as the tutorial says that
// just replace your values with a '?' but it
// doesn't work... how do i make it work???
PreparedStatement updateStmt = con.prepareStatement( "UPDATE table
SET colName = colName + ?
WHERE colID = ?" );
updateStmt.setString( 1, "newData" );
updateStmt.setInt( 2, 1 );
updateStmt.executeUpdate();
thanks in advance!

Answer 1

You should try the following:
PreparedStatement updateStmt = con.prepareStatement( "UPDATE table SET colName = ? WHERE colID = ?" );
updateStmt.setString( 1, colName +"newData" );
updateStmt.setInt( 2, 1 );
updateStmt.executeUpdate();
con.commit();
Your row with colID=1 should be updated, assuming you have the appropriate tablename and column names in the sql.