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Figure 3-32. Thee buttons: Books, Movies, and Music When the Books button is clicked, it will display the information related to it; that is, the paragraph of the class books will be displayed as shown in Figure 3-33.

The JDBC 3.0 specification proposes a functional Statement interface that provides access to get automatically generated key values after an insert. The following code examples demonstrate how to retrieve Oracle s sequence values using the new JDBC 3.0 method getGeneratedKeys(), which is now the preferred method to use if you need to retrieve automatically generated keys.

// Get all Schemas System.out.println("\nSchemas are called '" + dbmd.getSchemaTerm() + "' in this RDBMS."); processResultSet(dbmd.getSchemaTerm(), dbmd.getSchemas()); // Get all Table-like types System.out.println("\nAll table types supported in this RDBMS:"); processResultSet("Table type", dbmd.getTableTypes()); } finally { // Close the Connection object } } public static void processResultSet(String preamble, ResultSet rs) throws SQLException { // Printout table data while(rs.next()) { // Printout System.out.println(preamble + ": " + rs.getString(1)); } // Close database resources rs.close(); }

The Oracle JDBC driver does not support access to automatically generated key values after an insert. In other words, the Oracle driver does not implement Statement.getGeneratedKeys());. Instead, you have to use the Statement.executeQuery(); method, as follows:

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Figure 3-33. Information related to books is displayed when Books button is clicked Similarly, if the Movies button is clicked, it will hide the information related to the books or music and will make the information related to movies (that is, the paragraph of class movies) appear slowly on the screen with an animation effect, as shown in Figure 3-34.

rs = stmt.executeQuery("select ANIMAL_ID_SEQ.currval from dual");

With batch updating, a set of SQL statements is assembled and then sent to the database for execution. Batch updating can improve performance if you send lots of update statements to the database. According to Sun s JDBC Tutorial (http://java.sun.com/docs/books/tutorial/ jdbc/jdbc2dot0/batchupdates.html), A batch update is a set of multiple update statements that is submitted to the database for processing as a batch. Sending multiple update statements to the database together as a unit can, in some situations, be much more efficient than sending each update statement separately. This ability to send updates as a unit, referred to as the batch update facility, is one of the features provided with the JDBC 2.0 API. Determine Whether a Database Supports Batching /** * Check to see if database supports batching. * @param conn connection object to the desired database * @return true if database supports batching. */ public static boolean supportsBatching(java.sql.Connection conn) { if (conn == null) { return false; }

This is the Oracle database before running the solution: SQL> select * from animals_table; ID ---------1 2 3 NAME ---------dog cat rabbit

Instead of applying click events to the buttons, we can also attach the mouseover event to them. The mouseover event will make the appropriate information appear when the mouse pointer enters the button (there is no need to click the button). The jQuery code for attaching the mouseover event may appear as follows: $(document).ready(function() { $('.books').hide(); $('.movies').hide(); $('.music').hide(); $('#booksbutton').mouseover(function(){ $('.books').show('slow'); $('.movies').hide(); $('.music').hide(); }); $('#moviesbutton').mouseover(function(){ $('.movies').show('slow'); $('.books').hide(); $('.music').hide(); });

This shows how to run the solution: $ javac DemoGetGeneratedKeys.java $ java DemoGetGeneratedKeys oracle --DemoGetGeneratedKeys begin-conn=oracle.jdbc.driver.OracleConnection@18fb1f7 --------------key 1 is 4 --DemoGetGeneratedKeysUsingCurrval_Oracle end--

This is the Oracle database after running the solution: SQL> select * from animals_table; ID ---------1 2 3 4 NAME ----------dog cat rabbit tiger11

$('#musicbutton').mouseover(function(){ $('.music').show('slow'); $('.books').hide(); $('.movies').hide(); }); });

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