如果Java中不存在，则插入SQLite数据库

Question

我正在尝试在SQLite数据库中添加值，只有在使用if语句的Java数据库中不存在该值时。我完全糊涂了。

try{

                String econ = String.valueOf(txt_economic.getText());
                String malami = "Select * from MPA1 where econcd = ?";
                pst = conn.prepareStatement(malami);
                rs = pst.executeQuery();
            while(rs.next()){

                String econcdi = rs.getString("econcd");


                if(econ.equals(econcdi) ){

           try{
                     //Insert goes here
}catch(Exception e){
}