[FIXED] Auto-Increment of Identity in Netbeans Using DerbyDB

Issue

I am trying to insert data into a CUSTOMER table.

private void c_enterActionPerformed(java.awt.event.ActionEvent evt) {                                        
    String insertSQL = "insert into CUSTOMER(CUST_ID, CUST_NIC, CUST_FNAME,CUST_LNAME, CUST_EMAIL, CUST_ADDRESS, CUST_PHONE, CUST_IMG) values(?,?,?,?,?,?,?,?)";
    try{
        ps = con.prepareStatement(insertSQL);
        ps.setString(1,c_id_text.getText());
        ps.setString(2,c_nic_text.getText());
        ps.setString(3,c_fname_text.getText());
        ps.setString(4,c_lname_text.getText());
        ps.setString(5,c_email_text.getText());
        ps.setString(6,c_address_text.getText());
        ps.setString(7,c_phone_text.getText());
        ps.setString(8,img_path_txt.getText());
        ps.execute();
        JOptionPane.showMessageDialog(null, "New Customer Inserted\nCongratulations!");
        c_id_text.setText("");
        c_nic_text.setText("");
        c_fname_text.setText("");
        c_lname_text.setText("");
        c_email_text.setText("");
        c_address_text.setText("");
        c_phone_text.setText("");
        img_path_txt.setText("");
        updateTable();          
    }catch(Exception e){
        JOptionPane.showMessageDialog(null, "Insertion error: "+e);
    }
}    

The table was created using:

CREATE TABLE CUSTOMER(
CUST_ID INT PRIMARY KEY GENERATED ALWAYS AS IDENTITY (START WITH 1, INCREMENT BY 1),
CUST_NIC VARCHAR(14),
CUST_FNAME VARCHAR(20),
CUST_LNAME VARCHAR(25),
CUST_EMAIL VARCHAR(45), 
CUST_ADDRESS VARCHAR(60),
CUST_PHONE INTEGER,
CUST_IMG VARCHAR(100));
SELECT * FROM AKASH.CUSTOMER FETCH FIRST 100 ROWS ONLY;

I have disabled the CUST_ID text as shown. It's telling me "Attempt to modify an identity column 'CUST_ID'.

Now, for claritfication: I know what is happening. But I don't know how to fix it. I tried to remove ps.setString(1,c_id_text.getText()); , that didn't work. I also tried to remove CUST_ID from String insertSQL... , but to no avail. If I try to input data from the SQL using "Insert row" button, it works and the CUST_ID column displays ""

Solution

Found my mistake. Solved after commenting out ps.setString(1,c_id_text.getText()); and c_id_text.setText(""); as well as removing CUST_ID form the insertSQL line of code.

Answered By - Akash Digumber
Answer Checked By - Marilyn (JavaFixing Volunteer)