Database Reference
In-Depth Information
}
});
// It may take a while to get the user data, esp while we set up encryption
// So ask the user to be patient while working
Login.sayWaitDialog.setVisible(true)
;
}
That method,
existingEmpComboBox_actionPerformed()
gets the employee ID from the selected item
by using the
Utility.pullIdFromParens()
method. Before we display the modal
sayWaitDialog
that will
dominate the current GUI
Thread
process until dismissed or made invisible, we create a new
Runnable
Thread
and pass it to the
SwingUtilities.invokeLater()
method. This delayed
Thread
will populate the
AddUser
screen with data for the selected employee.
In our delayed thread
run()
method, we call two Oracle stored procedures, shown in abbreviated
form in Listings 12-20 and 12-22. The first procedure is one of our standard encrypted data queries from
Chapter 7,
p_select_employee_by_id_sens
. That procedure accomplishes key exchange, if not already
done, and selects data from the
HR.EMPLOYEES
table for the selected employee id. The
salary
and
commission_pct
values are returned in encrypted form. We call
OracleJavaSecure.getDecryptData()
to
decrypt the values and then populate each field on
AddUsers
with the value we retrieved.
If there is an error with our call to
p_select_employee_by_id_sens
, we display an error message
dialog, which is a modal dialog. If there is no error, then we get the components of the shared password
(DES) key from the Oracle database. Our first call to
OracleJavaSecure.getDecryptData()
will have the
side effect of building an equivalent DES key for use in the client.
Listing 12-20.
Abbreviated run() Method when Selecting Existing Employee, Part 1
public void run() {
int errNo;
String errMsg;
OracleCallableStatement stmt = null;
OracleResultSet rs = null;
try {
stmt =
(OracleCallableStatement)conn.prepareCall(
"CALL
hr.hr_sec_pkg.p_select_employee_by_id_sens
(?,?,?,?,?,?,?,?,?,?)");
...
stmt.setInt(10,
employeeID
);
stmt.executeUpdate();
errNo = stmt.getInt(8);
if (errNo != 0) {
errMsg = stmt.getString(9);
JOptionPane.showMessageDialog
(thisComponent,
"Oracle error p_select_employee_by_id_sens) " + errNo + ", " + errMsg);
} else {
sessionSecretDESSalt = stmt.getRAW
(3);
...
rs = (OracleResultSet)stmt.getCursor(7);
// Should be only one record for this Employee ID
if (rs.next()) {
firstNameTextField.setText
(rs.getString(2));
...
// Our stored procedure passes Hire Date back as sql.Date
