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Now that you understand the concept of refetching rows, you can look at how Oracle implements scroll-sensitive result sets. Oracle s implementation of scroll-sensitive result sets involves a window of rows. The window consists of n rows, starting with the current row where n is the fetch size. The window size affects how frequently the rows in the result set are refreshed to the latest rows. As you scroll through the rows, as long as your current row remains within the window, no refresh takes place. As soon as your current row moves to a new window, you redefine the window to be n rows, starting with the new current row. Whenever the window is redefined, the n rows corresponding to the new window are automatically refreshed through an implicit call to refreshRow(). Thus, with scroll-sensitive result sets, you see external changes only when the window is refreshed. Obviously, this can have a performance impact depending on your network round-trip cost, your result set s fetch size, and the size of each row in the result set. The class DemoScrollSensitiveResultSet shows how this works. The main() method simply invokes _demoScrollSensitiveResultSet(), passing in the connection and the familiar query from table t1. /* This program demonstrates a scroll-sensitive result set. * COMPATIBLITY NOTE: runs successfully against 10.1.0.2.0 and 9.2.0.1.0. */ import java.io.IOException; import java.sql.ResultSet; import java.sql.SQLException; import java.sql.PreparedStatement; import java.sql.Connection; import book.util.JDBCUtil; import book.util.InputUtil; class DemoScrollSensitiveResultSet { public static void main(String args[]) throws Exception, IOException { Connection conn = null; try { conn = JDBCUtil.getConnection("scott", "tiger", "ora10g"); _demoScrollSensitiveResultSet( conn, "select x from t1 order by x" ); } catch (SQLException e) { // handle the exception properly - in this case, we just // print the stack trace.

JDBCUtil.printException ( e ); } finally { // release the JDBC resources in the finally clause. JDBCUtil.close( conn ); } } // end of main() The method _demoScrollSensitiveResultSet() gets a scroll-sensitive, read-only result set: private static void _demoScrollSensitiveResultSet( Connection conn, String stmtString ) throws SQLException, IOException { ResultSet rset = null; PreparedStatement pstmt = null; try { pstmt = conn.prepareStatement( stmtString, ResultSet.TYPE_SCROLL_SENSITIVE, ResultSet. CONCUR_READ_ONLY); System.out.print( "For statement: " + stmtString + ", " ); rset = (ResultSet) pstmt.executeQuery(); JDBCUtil.printRsetTypeAndConcurrencyType( rset ); After printing the result set type and concurrency type, we set the fetch size to 5. We move to the first row of the result set: rset.setFetchSize(5); System.out.println( "New fetch size: " + rset.getFetchSize() ); rset.first(); // moves to first row Next, we insert a program pause, during which we update the first row from SQL*Plus: System.out.println( "Row number " + rset.getRow() + " has a value = " + rset.getInt( 1 ) ); InputUtil.waitTillUserHitsEnter( "Perform update on first row and " ); We then move to the last row; this will refresh just the last row. We move back to the first row; this will refresh the first five rows. We should see latest values of all these rows. To verify this, we print out the value of x in the first row, since we would have modified it during our pause: rset.last(); // moves to last row changing the window size rset.first(); // moves back to first row changing the window size System.out.println( "Row number " + rset.getRow() + " now has a value = " + rset.getInt( 1 ) ); } finally {

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// release the JDBC resources in the finally clause. JDBCUtil.close( rset ); JDBCUtil.close( pstmt ); } } } // end of program We assume that t1 contains the numbers 1 to 30 in its column x before running this program. When we run the program, we get the following output: >java DemoScrollSensitiveResultSet URL:jdbc:oracle:thin:@(DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(PORT=1521) (HOST=rmenon-lap))(CONNECT_DATA=(SID=ora10g))) For statement: select x from t1 order by x, Result set category (using Resul tSet API): Scroll sensitive, Read only New fetch size: 5 Row number 1 has a value = 1 Perform update on first row and Press Enter to continue... We modify the first row as follows: scott@ORA10G> update t1 set x = 111 where x = 1; 1 row updated. scott@ORA10G> commit; Commit complete. When we press Enter, we should see the latest value as follows: Press Enter to continue... Row number 1 now has a value = 111 In the next section, we will look at the database changes visible to a ResultSet object.

As you can see, the index values in the page change every two seconds (with a onesecond pause between updates and one second after the update without any refresh at all). If you were to refresh the page, you would notice all three values being reset to their initial values that were set in the page designer. Now view the source in the browser, and notice the generated client code:

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