Question

I’m trying to update a table in my AccessDB and i’m having a weird problem.
The update executes without throwing any exceptions but the date value is wrong and
everytime i update a record the value always changes to “30/12/1899”.
Same thing hapens when i’m trying to insert a new record.

In my DB the Date field is in ShortDate format.

Here is an example of my code:

private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {                                         

    DateFormat df = DateFormat.getDateInstance(DateFormat.SHORT);

    if (jList1.isSelectionEmpty()) {
        JOptionPane.showMessageDialog(null, "You have not selected any computer!");
    } else {
        try {
        String sql = "Update SYSTEMS set "
            + " CPU='" + cpuTextField.getText().trim()
            + "', MOBO='" + moboTextField.getText().trim()
            + "', RAM='" + ramTextField.getText().trim()
            + "', GPU='" + gpuTextField.getText().trim()
            + "', HDD='" + hddTextField.getText().trim()
            + "', PSU='" + psuTextField.getText().trim()
            + "', MONITOR='" + monitorTextField.getText().trim()
            + "', KEYBOARD='" + keyboardTextField.getText().trim()
            + "', MOUSE='" + mouseTextField.getText().trim()
            + "', OS='" + osTextField.getText().trim()
            + "', SOFTWARE='" + othersTextArea.getText().trim()
            + "', PURCHASE_DATE=" + df.format(jDateChooser1.getDate())
            + " where SYSTEM_ID='" + jList1.getSelectedValue().toString() + "'";

        st = con.prepareStatement(sql);
        st.executeUpdate();

        } catch (Exception e) {
        JOptionPane.showMessageDialog(null, e);
        }
        JOptionPane.showMessageDialog(null, "Updated");
    }
    }  

In order to figure out what is going wrong, I made a button and when pressed i had
a Message showing the result of df.format(jDateChooser1.getDate()) and
it showed the correct date.

private void jButton7ActionPerformed(java.awt.event.ActionEvent evt) {                                         
    DateFormat df = DateFormat.getDateInstance(DateFormat.SHORT);
    JOptionPane.showMessageDialog(null, df.format(jDateChooser1.getDate()));
} 

I’m using this component to get the date: JCalendar If that makes any difference.
I dont mind replacing it with a plain TextField, as long as the date is imported correctly.
When using select to retrieve the date from the DB everything goes well.
The problem only occurs when updating/inserting.

Answer 1

Access requires dates to specified in format #MM/dd/yyyy# (including the hash marks). So if you add the # delimiters at the beginning and end of the date string, it should work. As maerics suggested, the best would be to use PreparedStatement, because the JDBC drive will handle converting Java Date to the format Access understands, without you needing to format the value.