Relational_3.java

/*
 * Relational_3.java
 * 
 * Copyright 2004-2006 by SAP AG. All Rights Reserved.
 * SAP, R/3, mySAP, mySAP.com, xApps, xApp, SAP NetWeaver, and other SAP 
 * products and services mentioned herein as well as their respective logos 
 * are trademarks or registered trademarks of SAP AG in Germany and in several 
 * other countries all over the world. All other product and service names 
 * mentioned are the trademarks of their respective companies. Data contained 
 * in this document serves informational purposes only. National product 
 * specifications may vary.
 *
 * These materials are subject to change without notice. These materials are 
 * provided by SAP AG and its affiliated companies ("SAP Group") for 
 * informational purposes only, without representation or warranty of any kind, 
 * and SAP Group shall not be liable for errors or omissions with respect to 
 * the materials. The only warranties for SAP Group products and services are 
 * those that are set forth in the express warranty statements accompanying 
 * such products and services, if any. Nothing herein should be construed as 
 * constituting an additional warranty.
 */
package com.sap.ip.bi.sdk.samples;

import java.io.IOException;
import java.io.PrintWriter;
import java.sql.ResultSet;

import javax.servlet.ServletConfig;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import com.sap.exception.IBaseException;
import com.sap.ip.bi.sdk.dac.connector.IBIConnection;
import com.sap.ip.bi.sdk.dac.connector.IBIRelational;
import com.sap.ip.bi.sdk.samples.servlet.MinimalServletContainer;

/**
 * Direct execution of SQL statement -
 *
 * Demonstrates how to retrieve a result set by directly executing a
 * SQL statement, then shows how to display the result
 * set as an HTML table.
 *
 * View the HTML rendered by this servlet in the following file:
 * [SDK archive]/docs/examples/relational_3.result.html
 *
 * @author  SAP
 * @version 3.50
 * @since   3.50
 */
public class Relational_3 extends HttpServlet {
  private final static String CONTENT_TYPE = "text/html";

  public void init(ServletConfig config) throws ServletException {
    super.init(config);
  }

  public void doGet(
    HttpServletRequest request,
    HttpServletResponse response)
    throws ServletException, IOException {

    response.setContentType(CONTENT_TYPE);
    PrintWriter out = response.getWriter();

    out.println(Helpers.getDocTypeDefinition());
    out.println("<html>");
    out.println("<head><title>Relational_3</title>");
    out.println(Helpers.getStyleSheetDefinition());
    out.println("</head><body>");

    try {

      // ********************************************************
      // Connect to a data source.
      // ********************************************************
      IBIConnection connection =
        Helpers.connectToJDBCDatasource(out);
      IBIRelational rel = connection.getRelational();

      // create JDBC sample data where needed
      Helpers.createJDBCSampleData();

      // ********************************************************
      // Execute the SQL Statement, creating a result set by 
      // calling newDataset() method and passing the MDX 
      // statement along.
      // ********************************************************
      String sqlStatement =
        "SELECT * FROM "
          + Helpers.getJDBCTablePrefix()
          + "CUSTOMERS";
      ResultSet res = rel.getResultSet(sqlStatement);
      out.println(
        "<p><b>SQL Statement that was executed:</b><br> <code>"
          + sqlStatement
          + "</code><p>");

      // ********************************************************
      // Render the result set.
      // ********************************************************
      Helpers.renderResultset(out, res);

    } 
    // Catch errors.
    catch (Exception e) {
      // $JL-EXC$
      e.printStackTrace();
      if (e instanceof IBaseException)
        out.println("Error: " +
                ((IBaseException)e).getNestedLocalizedMessage());
      else  
        out.println("Error: " + e.getMessage());        
    }
    out.println("</body>");
    out.println("</html>");
  }

  public void destroy() {
  }

  public static void main(String[] args) {
    if (args.length == 1) {
      MinimalServletContainer.executeServlet(new Relational_3(), args[0]);
    } else {
      MinimalServletContainer.executeServlet(new Relational_3(), System.out);
    }

  }

}