when i press the button it always duplicate the existing records on the jTable

Question

When I press the button it always duplicates the existing records on the jTable. How can I show just one data at a time?

void showAll(){
    try{
        rs=stmt.executeQuery("SELECT * FROM ATTENDANCE");
        while (rs.next()){
            String a1 = rs.getString("NAME");
            String b1 = rs.getString("COURSE");
            String c1 = rs.getString("STUDENTNO");
            String d1 = rs.getString("DATE");
            DB1.addRow(new Object[]{a1,b1,c1,d1});
        }
    }catch(Exception e){
        System.out.println(e);
    }
}

Iif I understand correctly problem related with your query so you can look here https://stackoverflow.com/questions/8919481/how-to-select-only-1-row-from-oracle-sql — User8500049, Mar 22 '20 at 19:38
It's not clear what you want, the code that you present shows selecting all data in the table and add to DB1. Could you please provide more details — heaprc, Mar 22 '20 at 19:47
@am0awad i only wanted to be selected is the last data that i input — Mark Mark, Mar 22 '20 at 20:11

score 0 · Accepted Answer · answered Mar 22 '20 at 20:14

0

Try this query

String query = "SELECT a.* FROM ATTENDANCE a WHERE id=(SELECT MAX(aa.id) FROM ATTENDANCE aa);"

, or

String query = "SELECT a.* FROM ATTENDANCE a WHERE id=(SELECT LAST_INSERT_ID())";

answered Mar 22 '20 at 20:14

heaprc

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when i press the button it always duplicate the existing records on the jTable

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