ResulstSet이 닫혔는데... 닫히는 이유가 먼가요?

DROP CLASS JM_USR;
CREATE CLASS JM_USR (
    USR_ID      CHAR VARYING(253)       NOT NULL    PRIMARY KEY,
    USR_NCK     CHAR VARYING(253)       NOT NULL    UNIQUE,
    USR_PW      CHAR(22)                NOT NULL,
    USR_ATH     CHAR(22)                ,  
    USR_PT      NUMERIC(38, 8)          DEFAULT 0
);

 

 

 

 

  1 package jeemin;
  2
  3 import java.sql.*;
  4
  5 import cubrid.jdbc.driver.*;
  6
  7 public class Test1{
  8     public static void main(String[] args){
  9         try{
 10             Class.forName("cubrid.jdbc.driver.CUBRIDDriver");
 11             Connection conn = DriverManager.getConnection("jdbc:cubrid:localhost:33000:jeemin:::", "jeemin", "jeemin");
 12             PreparedStatement ps = conn.prepareStatement("SELECT JM_USR, USR_NCK, USR_PT FROM JM_USR WHERE USR_ID=? AND USR_PW=?");
 13             ps.setString(1, "test");
 14             ps.setString(2, "KFq5RI0nUe5X7Of3YsOQlQ");
 15
 16             CUBRIDResultSet rs = (CUBRIDResultSet)ps.executeQuery();
 17
 18             if(rs.next()){
 19                 System.out.println(rs.getString("USR_NCK"));
 20             }
 21
 22             CUBRIDPreparedStatement ps2 = (CUBRIDPreparedStatement)conn.prepareStatement("UPDATE JM_USR SET USR_ATH=? WHERE JM_USR=?");
 23             ps2.setString(1, "ABCDEFG");
 24             ps2.setOID(2, rs.getOID("JM_USR"));
 25             ps2.execute();
 26             ps2.close();
 27
 28             rs.getString("USR_NCK");
 29
 30             rs.close();
 31             ps.close();
 32             conn.close();
 33         }catch(Exception e){
 34             e.printStackTrace();
 35         }
 36    
 37     }
 38 }

 

 

 

 

cubrid.jdbc.driver.CUBRIDException: Attempt to access a closed ResultSet.
 at cubrid.jdbc.driver.CUBRIDResultSet.checkIsOpen(CUBRIDResultSet.java:1648)
 at cubrid.jdbc.driver.CUBRIDResultSet.findColumn(CUBRIDResultSet.java:670)
 at cubrid.jdbc.driver.CUBRIDResultSet.getString(CUBRIDResultSet.java:559)
 at jeemin.Test1.main(Test1.java:28)

 

 

 

 

28번째 라인에서 rs가 이미 닫혔다고 나옵니다.

 

정확하게 닫히는 이유가 먼가요?

 

 

 

 

cubrid에서는 세그먼트를 2개 열면 첫번째 세그먼트가 자동으로 닫히나요?

 

정확하게 어떤 경우에 닫히는지를 정의해 주실수 있나요?