how can i use a jComboBox using rowset

Hello, i'm trying to use a jComboBox to search data on my database.

i'm using this code:
rs.setCommand("SELECT * FROM aanmeldingsformulier WHERE" + jComboBox1.getSelectedItem() + " = ?");

but when a i run it gives me this error: java.sql.SQLException: no value specified for parameter 1.

can someone help me?
thnx

http://java.sun.com/j2se/1.5.0/docs/api/index.html?index-filesindex-1.html

If you look at the Java API(linked above), JComboBox returns an Object. You will probably need to cast this as a String to place it in your query. On a side note, you may want to look into prepared statements, as they are generally considered more secure than concatenating strings dynamically in your query.