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mysql> use octopus; Database changed mysql> desc ztest; +-------+-------------+------+-----+---------+-------+ | Field | Type | Null | Key | Default | Extra | +-------+-------------+------+-----+---------+-------+ | id | varchar(10) | | PRI | | | | name | varchar(20) | YES | | NULL | | +-------+-------------+------+-----+---------+-------+ 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)

ResultSet.close() releases the ResultSet object s database and JDBC resources immediately instead of waiting for this to happen automatically when it is closed.

You have an image that is displayed at the center of the browser window (enclosed in an invisible window). You want the image to keep scrolling; that is, it should scroll toward the left boundary of the window and disappear, then reappear from the right side of the window, and again scroll toward the left, and so on.

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This shows how to close a ResultSet and not report exceptions: /** * Close a ResultSet; avoid closing if null, and * hide any SQLExceptions that occur. * @param rs a java.sql.ResultSet object. */ public static void closeQuietly(java.sql.ResultSet rs) { if (rs == null) { return; } try { // releases this ResultSet object's database and // JDBC resources immediately instead of waiting // for this to happen when it is automatically closed. rs.close(); }

To create a WebRowSet object, we use the WebRowSetExample class, which does the following: Create a WebRowSet object: webRS = new WebRowSetImpl(); Set the SQL query for getting the result from the database: webRS.setCommand(sqlQuery); Pass the Connection object to the execute() method to fill up the WebRowSet object: webRS.execute(conn); 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 WebRowSetExample { WebRowSet webRS;

We need to write the HTML code to display an image. We also need to enclose the image element within a div, as shown here: <body> <div id="scroller"> <img src="image1.jpg" width=150px height=150px class="image"/> </div> </body> In the HTML code, we can see that the img element is enclosed within a div element, which is assigned the ID scroller. The reason for making use of the div element is to assign the width and height to the invisible window for the image (within which we want it to scroll). We write the ID selector #scroller in the style sheet so that the style properties defined in it can be automatically applied to the div element of ID scroller without using jQuery code. The style sheet will also contain the class selector .image to assign the relative property to position property of the img element, which is necessary to make the image scroll.

catch (Exception e) { //ignore e.printStackTrace(); } }

This shows how to close a ResultSet and log exceptions: /** * Close a ResultSet; avoid closing if null, and * hide any SQLExceptions that occur. * @param rs a java.sql.ResultSet object. * @param logger a Logger object is used to log messages. */ public static void closeQuietly(java.sql.ResultSet rs, java.util.logging.Logger logger) { if (rs == null) { return; } try { rs.close(); } catch (Exception e) { // handle the exception and log it e.printStackTrace(); if (logger != null) { logger.warning("closeQuietly: "+e.getMessage()); } } }

public static void main(String[] args) { String dbVendor = args[0]; // {"mysql", "oracle", "odbc"} String id = args[1]; // PK to ztest table WebRowSetExample wrse = new WebRowSetExample(); Connection conn = null; try { conn = VeryBasicConnectionManager.getConnection(dbVendor); wrse.populateRowSet(conn, id); wrse.writeXml(id); } catch (Exception e) { e.printStackTrace(); } } void populateRowSet(Connection conn, String id) throws Exception { ResultSet rs = null; Statement stmt = null; try { stmt = conn.createStatement(); String sqlCount = "SELECT count(*) FROM ztest WHERE " + "id='" + id + "'"; System.out.println("sqlCount="+sqlCount); rs = stmt.executeQuery(sqlCount); int count = 0; if (rs.next()) { count = rs.getInt(1); } webRS = null; if (count > 0) { System.out.println("Found " + count + " IDs for id " + id); System.out.println("Querying database for track data..."); String sqlQuery = "SELECT * FROM ztest WHERE " + "id='" + id + "'"; System.out.println("sqlQuery="+sqlQuery); webRS = new WebRowSetImpl(); webRS.setCommand(sqlQuery); webRS.execute(conn); RowSetMetaData rsMD = (RowSetMetaData) webRS.getMetaData(); System.out.println("rsMD="+rsMD); } }

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