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scott@ORA10G> create table t1 as 2 select rownum as x 3 from all_objects 4 where rownum <= 30; Table created. scott@ORA10G> select count(*) from t1; COUNT(*) ---------30 scott@ORA10G> commit; The program DempUpdatability begins with the import statements followed by the main() method, which invokes the _demoUpdatability() method containing the bulk of the logic: /* This program demonstrates the updatability of a result set. * COMPATIBLITY NOTE: runs successfully against 10.1.0.2.0, and 9.2.0.1.0 */ import java.sql.ResultSet; import java.sql.SQLException; import java.sql.PreparedStatement; import java.sql.Connection; import oracle.jdbc.OracleTypes; import book.util.JDBCUtil; class DemoUpdatability { public static void main(String args[]) throws Exception { Connection conn = null; try { conn = JDBCUtil.getConnection("scott", "tiger", "ora10g"); _demoUpdatability( conn ); } 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()
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The method _demoUpdatability() first obtains a scroll-insensitive and updatable result set. (Note that the example would also work for scroll-sensitive result sets.) It then prints out the result set s type and concurrency type: private static void _demoUpdatability( Connection conn ) throws SQLException { System.out.println("Inside _demoUpdatability"); ResultSet rset = null; PreparedStatement pstmt = null; try { pstmt = conn.prepareStatement( "select x from t1", ResultSet.TYPE_SCROLL_INSENSITIVE, ResultSet.CONCUR_UPDATABLE); JDBCUtil.printRsetTypeAndConcurrencyType( pstmt ); rset = (ResultSet) pstmt.executeQuery(); JDBCUtil.printRsetTypeAndConcurrencyType( rset ); Next, we move to row number 3 and update the value (originally 3) to 31: // demo update row rset.absolute( 3 ); rset.updateInt(1, 31 ); rset.updateRow(); We then move to row number 4 and delete it: // demo delete row rset.absolute( 4 ); rset.deleteRow(); Finally, we insert a new row with a value of 35 for the x column. We also print the original row where we were before we did the insert. Finally, we commit and end the method with the usual finally clause: // demo insert row rset.moveToInsertRow(); rset.updateInt(1, 35 ); rset.insertRow(); System.out.println("\tMoving to row where I was before inserting" ); rset.moveToCurrentRow(); System.out.println("\tThe row where I was before inserting: " + rset.getRow() ); conn.commit(); } finally { // release the JDBC resources in the finally clause. JDBCUtil.close( rset ); JDBCUtil.close( pstmt );
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} } }// end of program The output of the program is as follows: >java DemoUpdatability URL:jdbc:oracle:thin:@(DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(PORT=1521) (HOST=rmenon-lap))(CONNECT_DATA=(SID=ora10g))) Inside _demoScrollInsensitiveUpdatable Result set category (using Statement API): Scroll insensitive, Updatable Result set category (using ResultSet API): Scroll insensitive, Updatable Moving to row where I was before inserting The row where I was before inserting: 3 Inside _demoScrollSensitiveUpdatable Result set category (using Statement API): Scroll sensitive, Updatable Result set category (using ResultSet API): Scroll sensitive, Updatable Before delete current row number 4 has value: 5 After delete current row number 3 has value: 31
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Whether you perform an update using the standard update statement or you use the update capability of a result set, JDBC (or Oracle) does not guarantee that someone else has not modified the row since the query was executed. Please see the section Lost Updates of 16 to read up on how to resolve the situation where your update operation conflicts with another transaction s DML operation.
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Refetching of rows is defined as reobtaining the rows that correspond to n rows in a result set, starting with the current row, where n is the fetch size of the result set. As of 10g Release 1 (including 9i releases), you can refetch rows for the following types of result sets: Scroll-sensitive/read-only Scroll-sensitive/updatable Scroll-insensitive/updatable To refetch the rows, you need to move to a valid row (not on a blank row created to perform an insert operation) and then invoke the refreshRow() method on the result set: void refreshRow() throws SQLException; Please note that you can only see any updates done on the n rows being refreshed. You won t see any new inserts or deletes that would be visible should you reissue the current
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