.NET/ASP.NET/C#/VB.NET PDF Document SDK

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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0) The inferred F# type of this class is as follows: type APoint = new : unit -> APoint new : angle:double * radius:double -> APoint static member Circle : n:int -> APoint list member Stretch : l:double -> APoint member Warp : f:(double -> double) -> APoint member Angle : double member Radius : double.

Output caching allows you to take the markup generated by a page object or user control and squirrel it away in the memory of the web server. You do this very simply by adding a directive to the top of the markup file. <%@ OutputCache Duration=15 VaryByParam=None %> The Duration attribute expresses the number of seconds the output should be cached. The VaryByParam attribute allows you to make different cache entries for different requests, creating a unique entry per query string value, for example. When a page is output cached, the next time a request comes in for the page, the pregenerated markup is pulled from the cache and sent as the response to the request. This saves the time and expense of creating an instance of the page object and executing all of the code it contains, and can even save network hops to the database. Output caching is screaming fast, as the results are in memory and the Framework doesn t even have to read a file from the disk (as it would for a static HTML document). The results are returned right from memory.

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 );