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We then retrieve all the rows of the table and store them in the variable tr; that is, now tr is an array containing all the rows of the table In the click event handler of the page numbers, we hide all the rows of the table (keeping only the column visible) We then display the rows that fall within the clicked page number using the tr array Initially, we get a blank table with only column headings and page numbers at the top, as shown in Figure 7-15..

Client programs use only the java.sql.Connection interface and a manager class called ConnectionManager. The ConnectionManager class uses ConnectionFactory (an abstract class), which is extended by three specific classes:

import java.sql.*; import javax.servlet.*; import javax.servlet.http.*; 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 GetExportedKeys extends HttpServlet { public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { Connection conn = null; ResultSet exportedKeys = null; try { String dbVendor = request.getParameter("vendor").trim(); String outputFormat = request.getParameter("format").trim(); String table = request.getParameter("table").trim(); conn = VeryBasicConnectionManager.getConnection(dbVendor); if (dbVendor.equals("mysql")) { String catalog = request.getParameter("catalog").trim(); exportedKeys = getExportedKeys(conn, catalog, // catalog, null, // schema table); }

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OracleConnectionFactory (creates Oracle Connection objects) MysqlConnectionFactory (creates Oracle Connection objects) OdbcConnectionFactory (creates JDBC-ODBC Connection objects) ConnectionManager is a singleton class, which makes sure that only one instance of an object exists at any one time. (Singleton is a design pattern; for details, please refer to the Design Patterns book by the Gang of Four.) Therefore, clients will not instantiate objects of a singleton class but retrieve/get a reference to the single object created inside singleton class.

On hovering on any page number, the number will be highlighted; on clicking on the page number, the rows of that page number will be displayed as shown in Figure 7-16.

To use the BCM package with your own values, you need to modify the following values in the specific connection factory class. For example, to supply your own values for an Oracle database connection, update the following in the OracleConnectionFactory class: public static final String ORACLE_DRIVER = "oracle.jdbc.driver.OracleDriver"; public static final String ORACLE_URL_PREFIX = "jdbc:oracle:thin:@localhost:1521:"; public static final String DEFAULT_USER = "scott"; public static final String DEFAULT_PASSWORD = "tiger"; public static final String DEFAULT_DATABASE = "scorpian";

else if (dbVendor.equals("oracle")) { String schema = request.getParameter("schema").trim(); exportedKeys = getExportedKeys(conn, null, // catalog, schema, // schema table); } else { printError(response, "unknown db vendor"); return; } if (outputFormat.equals("xml")) { printXML(response, exportedKeys); } else { printHTML(response, exportedKeys); } } catch(Exception e) { e.printStackTrace(); printError(response, e.getMessage()); } finally { DatabaseUtil.close(exportedKeys); DatabaseUtil.close(conn); } } // end doGet

You can use a static method (valueOf()) of the java.sql.Date class. The java.sql.Date object s valueOf() method accepts a String, which must be the date in JDBC time escape format: YYYY-MM-DD. For example, to create a Date object representing November 1, 2000, you would use this: String date = "2000-11-01"; java.sql.Date javaSqlDate = java.sql.Date.valueOf(date); The java.sql.Date.valueOf() method throws an IllegalArgumentException (a runtime exception) if the given date is not in the JDBC date escape format (YYYY-MM-DD).

Figure 7-16. Displaying rows of page one (assuming one row per page) We see only one row displayed here because we have set the value of the variable no_rec_per_page (which decides the number of rows to be displayed per page) to 1 (refer to the third statement of the code). Let us set its value to 5. Assuming the HTML file has some more rows added in its table element, we will now see a group of five rows when we select any page number, as shown in Figure 7-17.

GregorianCalendar is a concrete subclass of Calendar and provides the standard calendar system used by most of the world. You may use the year, month, and day of month to construct a GregorianCalendar with the given date set in the default time zone with the default locale. For example, to create a Date object representing November 1, 2000, you would use this: // month value is 0-based. e.g., 0 for January. Calendar calendar = new GregorianCalendar (2000, // year 10, // month 1); // day of month

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