Getting "missing return statement" error for following code:

Code:
import java.sql.*;
public class DatabaseManager{
  public static int add(String user,String password)throws Exception{
    Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
    Connection con=DriverManager.getConnection("jdbc:odbc:userRecords");
    Statement st=con.createStatement();
    

    String
...