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To do something useful with a database, you need a Connection (java.sql.Connection interface) object. When you are done with your database task, you need to close the Connection object. (Closing a Connection object is referred to as disconnecting from a database.) If you have borrowed your Connection object from a connection pool manager, then you have to return it to the connection pool manager; otherwise, you need to close it properly.

private static void printXML(HttpServletResponse response, Map<String, String> tablesAndViews) throws Exception { response.setContentType("text/xml"); PrintWriter out = response.getWriter(); StringBuilder buffer = new StringBuilder(); buffer.append("< xml version=\"1.0\" encoding=\"ISO-8859-1\" >"); buffer.append("<tables_and_views>"); for (Map.Entry<String, String> e : tablesAndViews.entrySet()) { buffer.append("<name type=\""); buffer.append(e.getValue()); buffer.append("\">"); buffer.append(e.getKey()); buffer.append("</name>"); } buffer.append("</tables_and_views>"); out.println(buffer.toString()); } private static void printError(HttpServletResponse response, String message) { try { PrintWriter out = response.getWriter(); StringBuffer buffer = new StringBuffer(); buffer.append("<html><body>"); buffer.append(message); buffer.append("</body></html>"); out.println(buffer); } catch(Exception ignore) { } }

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Assume that there is a connection pool manager identified by a singleton class ConnectionPoolManager, which manages a pool of connections for several data sources. Further assume that this class has two static methods: getConnection(String dataSourceName) releaseConnection(Connection conn) Then you can write the following snippet for getting a connection and then a disconnection from the database. Note that the connection pool manager does a soft close (rather than a hard close) on the connections, which means it just returns the connection to the pool to be used by other clients.

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We extract the information in attribute optiontext from the n object one by one, and nest it in between the <li> and </li> tags (to make them appear as list items) and concatenate them in the drinks variable Once that's done, we assign the contents to the drinks variable, so it contains the information stored in the optionvalue attribute of the objects in our JSON file) This is now in the form of list items and goes to the div element of message for display Finally, we return false in the click event to suppress the default browser click behavior, because we want that click event to take action that is specified via our jQuery code rather than its default action On execution, our web page will initially display the paragraph element and a submit button as shown in Figure 8-21..

Connection conn = null; try { // get Connection object from the pool String dataSourceName = "myDataSource"; conn = ConnectionPoolManager.getConnection(dataSourceName); System.out.println("conn="+conn); // use connection do something useful with it. } catch(Exception e){ // handle the exception e.printStackTrace(); // do more handling } finally { // disconnect from the database // release Connection object: this is a soft close if (conn != null) { ConnectionPoolManager.releaseConnection(conn); } }

/** * Get the Oracle table names for a given connection object. * If you use getTableNames() for an Oracle database, you * will get lots of auxiliary tables, which belong to the user, * but the user is not interested in seeing them. * * @param conn the Connection object * @return the list of table names as a List. * @exception Failed to get the table names from the database. */

Assume that there is static method (getConnection()) that returns a new Connection object. Then you can write the following: import jcb.util.DatabaseUtil; ... Connection conn = null; try { // get Connection object from the pool String dataSourceName = "myDataSource"; conn = getConnection(dataSourceName); System.out.println("conn="+conn); // use connection do something useful with it. } catch(Exception e){ // handle the exception e.printStackTrace(); // do more handling } finally { // disconnect from the database // release Connection object: this is a soft close Databaseutil.close(conn); }

Figure 8-21. Initial web page with text message and a Submit button On clicking the submit button, the information stored in optionvalue, in the JSON file is displayed in the form of list items as shown in Figure 8-22:

The java.sql.Connection interface has several methods that control the commit and rollback updates to a database. The void setAutoCommit(boolean autoCommit) method directly deals with the Connection object s autocommit mode; it sets this connection s autocommit mode to the given state.

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