How can I execute a statement before a VO is running

Question

JDEVADF_11.1.1.3.PS2_GENERIC_100408.2356.5660
I use ADF BC
how can I execute a statement before a VO is running

Answer 1

thanks for the answer
i use a logon function before I run a VO
after a certain time will be disconnected
and I have to call the function again
sorry for my English
public String logon(String username, String password){
CallableStatement st = null;
this.username = username;
this.password = password;
try {
st = getDBTransaction().createCallableStatement("begin ep_security.LogOn(?,?); end;",0);
st.setObject(1, username);
st.setObject(2, password);
st.executeUpdate();
this.getDBTransaction().commit();
} catch (SQLException e) {
System.out.println("ERROR "+e.getMessage());
this.addWarning(new JboWarning("Quote retrieved successfully"));
System.out.println("...RETURN ERROR");
return "error";
} finally {
if (st != null) {
try {
// 7. Close the statement
st.close();
} catch (SQLException e) {
e.printStackTrace();
}