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ok, i will check again. But in Insert Data menu i use uppercase 'INSERT INTO UNIT' run well, no problem found.
Note : I've tried to change the 'UNIT' to lowercase, but the data in the database...

ok.. thanks before.

sql query run properly, the data in the database was changed according to query. & already me try in phpMyAdmin query run properly. strange problem appears after I use Method SetEnable(false) on...

of course JOptionPane in try block, not the catch block, and there is no SQLException e errors that appear. its database connection class certainly is not null. I made a connection class in use by...

ya, I posted on a few forums to get the answer. because sometimes if just post on one forum, I did not get the answer of my problem.

Dear All,
What this is bugs of Java or me not to understand java programming, this my piece code :
String kode = txtKode.getText();
String nama = inputNama.getText();
String...