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This shows how to close Statement and Connection objects and ignore exceptions: /** * Close a statement and connection. * @param stmt a Statement object (derived from conn object) * @param conn a Connection object */ public static void closeQuietly(Statement stmt, Connection conn) { if (stmt != null) { try { // close the statement stmt.close(); } catch (Exception ignored1) { } } if (conn != null) { try {

// close the connection if (!conn.isClosed()) { conn.close(); } } catch (Exception ignored2) { } } }

page. This is the initial image that will appear first on the web page. Once this is complete, we attach the hover event to all the images (all HTML elements of the class imge). In the hover event, we make the current image appear slowly when the mouse is over the image. When the mouse pointer is moved away from the image being displayed, we see the next image to be displayed. We first check that we are not on the last image (of elements of the class imge), then we assign the next image in sequence to the variable next. And if we are at the last image, the first image (of the HTML elements of the class imge) is assigned to the variable next. In other words, the variable next will be set to refer either to the next image in sequence or to the first image (if we have reached the last image of the class imge). Once we have decided on the image to display next, the image that is currently visible is made to fade out slowly. Finally, the image in the variable next (referring to the next image in sequence) is set to appear slowly on the web page (fade in). Initially, we get the first image of the five images on the screen, as shown in Figure 6-10.

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2 rows in set (0.00 sec) mysql> select * from ztest; +----+------+ | id | name | +----+------+ | 11 | alex | | 22 | bob | | 33 | mary | +----+------+ 3 rows in set (0.00 sec)

This shows how to close Statement and Connection objects and report exceptions: /** * Close a statement and connection. * @param stmt a Statement object (derived from conn object) * @param conn a Connection object * @throws SQLException failed to close statement and connection. */ public static void close(Statement stmt, Connection conn) throws SQLException { if (stmt != null) { // close the statement stmt.close(); } if (conn != null) { // close the connection if (!conn.isClosed()) { conn.close(); } } }

In this section, I presented the basic outline of the JDBC architecture. JDBC s DriverManager class provides the basic service for managing a set of JDBC drivers. I will talk about these classes and interfaces in detail in section 1-10.

Figure 6-10. The first image displayed on loading the web page On hovering over the image (that is, on moving the mouse over the image and taking it away), the next image in sequence will appear slowly, as shown in Figure 6-11. Similarly, all the images will be displayed one by one. When the last image is reached, the first image will reappear:

import java.io.*; import java.sql.*; import javax.sql.*; import javax.sql.rowset.WebRowSet; import com.sun.rowset.WebRowSetImpl; import jcb.util.DatabaseUtil; import jcb.db.VeryBasicConnectionManager; public class WebRowSetMetaDataExample { WebRowSet webRS; public static void main(String[] args) { String dbVendor = args[0]; // {"mysql", "oracle", "odbc"} WebRowSetMetaDataExample wrse = new WebRowSetMetaDataExample(); Connection conn = null; try { conn = VeryBasicConnectionManager.getConnection(dbVendor); wrse.populateRowSet(conn); wrse.writeXml(); } catch (Exception e) { e.printStackTrace(); } finally { DatabaseUtil.close(conn); } } void populateRowSet(Connection conn) throws Exception { System.out.println("Querying database for metadata only..."); String sqlQuery = "SELECT * FROM ztest WHERE 1=0"; System.out.println("sqlQuery="+sqlQuery);

Figure 1-2 illustrates a high-level architecture of JDBC. You can use JDBC from your Java programs (applications, applets, servlets, and JavaServer Pages).

So let make a slide show. We ll display an image that, when clicked, will be replaced by another image in sequence, and so on. The only modification that we will make to the preceding jQuery code is that instead of the hover event, we will attach the click event to the images. The Query code may appear as shown here:

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