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Caching prepared statements is another mechanism (introduced in JDBC 3.0) through which you can improve a JDBC application s response time. Use PreparedStatement object pooling only with SQL queries that rarely change. You should not use this in queries that have dynamically generated SQL or queries with frequently changing variables.

import java.io.PrintWriter; import java.io.IOException; import java.sql.*; import javax.servlet.*; import javax.servlet.http.*; import jcb.util.DatabaseUtil; import jcb.db.VeryBasicConnectionManager; public class MyDatabaseServlet extends HttpServlet {

rightarrow contains the style properties that will be automatically applied to the right arrow image It contains the margin-left property set to 390px to make the right arrow image be right-justified in the assigned width of 460px, and the margin-top property is set to 10px to keep it 10px from the images block at its top Now turning to the jQuery code in our solution, you ll notice that all the images that are nested inside the anchor element of the div element of ID scroller, are retrieved and stored in a variable $wrapper We continue by defining a function leftanimator that takes in the parameter imgblock, which it animates toward the left slowly and stops at the distance of 310px from the left border (310px inside the left border).

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If you receive messages that you are running out of cursors or that you are running out of memory, make sure all your Statement, PreparedStatement, CallableStatement, Connection, and ResultSet objects are explicitly closed. To close these objects, use the close() method. From a software engineering point of view, you should put close() statements in a finally clause because this guarantees that the statements in the finally clause will be executed as the last step regardless of whether an exception has taken place. The following code provides a sample code template to do this:

Connection conn = null; Statement stmt = null; PreparedStatement pstmt = null; ResultSet rs = null; try { // get a valid Connection object conn = ... // turn off autocommit, and start a new transaction conn.setAutoCommit(false); stmt = conn.createStatement(); stmt.executeUpdate("create table dept_table(...)"); String insert = "insert into dept_table values ( , )"; pstmt = conn.prepareStatement(insert); pstmt.setString (1, "sales"); pstmt.setString (2, "Troy"); pstmt.addBatch(); //JDBC queues this for later execution pstmt.setString (1, "business"); pstmt.setString (2, "Los Angeles"); pstmt.addBatch(); //JDBC queues this for later execution // now, the queue size equals the batch value of 3 // submit a batch of update commands for execution // submit the updates to the DBMS; calling the // PreparedStatement.executeBatch() clears the statement's // associated list of batch elements. int[] updateCounts = pstmt.executeBatch(); rs = stmt.executeQuery("select * from dept_table"); while (rs.next()) { ... } // commit the transaction conn.commit(); } catch(Exception e) { // handle the exception e.printStackTrace(); conn.rollback(); } finally { // close JDBC resources DatabaseUtil.close(rs); DatabaseUtil.close(stmt); DatabaseUtil.close(pstmt); DatabaseUtil.close(conn); } The following is according to Oracle documentation:

public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { String query = "SELECT id, name, age FROM employees"; ResultSet rs = null; Statement stmt = null; Connection conn = null; try { String dbVendor = request.getParameter("vendor").trim(); conn = VeryBasicConnectionManager.getConnection(dbVendor); stmt = conn.createStatement(); rs = stmt.executeQuery(query); printResultSet(response, rs ); } catch(Exception e) { printError(response, e.getMessage()); } finally { DatabaseUtil.close(rs); DatabaseUtil.close(stmt); DatabaseUtil.close(conn); } } // end doGet private static void printResultSet(HttpServletResponse response, ResultSet rs) throws Exception { PrintWriter out = response.getWriter(); StringBuffer buffer = new StringBuffer(); buffer.append("<html><body><table border=1 cellspacing=0 cellpadding=0>"); buffer.append("<TR><TH>id</TH><TH>name</TH><TH>age</TH></TR>"); while (rs.next()) { int id = rs.getInt(1); String name = rs.getString(2); int age = rs.getInt(3); buffer.append("<TR><TD>"+id+"</TD><TD>"+name+ "</TD><TD>"+age+"</TD></TR>"); } buffer.append("</table></body></html>"); out.println(buffer.toString()); }

As a result, the two images on the left of the image block will disappear inside the left border of the invisible window, making two images on the right (which were hidden earlier) become visible The rightanimator method takes in the parameter imgblock, which it animates toward the right slowly and stops at the distance of 0px from the left border That is, it will make the image block scroll toward the right border and stop when the first image of the block becomes visible the scrolling will stop when the first three images are visible in the invisible window It will make the two images on the right side become invisible.

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