How to connect database

Question

This is my jsp file!(
Claims Processing: Data Entry
Created on Apr 18, 2007
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package Database;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import javax.naming.Context;
import javax.naming.InitialContext;
import javax.sql.DataSource;
@author Administrator
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public class DataRetriever {
     Connection connection = null;
     public DataRetriever(String jndiName) {
          try {
               Class.forName("com.microsoft.jdbc.sqlserver.SQLServerDriver");
               connection =
                    DriverManager.getConnection(
                         "jdbc:microsoft:sqlserver://localhost:1433;DatabaseName=HRMS;User=sa;Password=sa");
               System.err.println("Database connection established AGAIN");
          } catch (Exception e) {
               System.err.println("Cannot connect to database server - " + e);
     private void getConnection(String jndi) {
          try {
               Context ctx = new InitialContext();
               if (ctx == null) {
                    throw new Exception("Boom - No Context");
               DataSource ds = (DataSource) ctx.lookup("java:comp/env/" +jndi);
               System.err.println(jndi);
               if (ds != null) {
                    connection = ds.getConnection();
          } catch (Exception e) {
               e.printStackTrace();
               connection = null;
     public ResultSet execSelectQuery(String sql) {
          try {
               if (connection == null) {
                    return null;
               Statement s = connection.createStatement();
               return s.executeQuery(sql);
          } catch (SQLException e) {
               e.printStackTrace();
               return null;
     public int execUpdateQuery(String sql) {
          try {
               if (connection == null) {
                    return -1;
               Statement s = connection.createStatement();
               return s.executeUpdate(sql);
          } catch (SQLException e) {
               e.printStackTrace();
               return -1;
     public void terminate() {
          try {
               connection.close();
          } catch (SQLException e) {
               e.printStackTrace();
This is the servlet.
package servlet;
import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import bean.createClaimsBean;
public class CreateClaimsServlet extends HttpServlet {
protected void doGet(
HttpServletRequest request,
HttpServletResponse response)
throws ServletException, IOException {
processRequest(request, response);
protected void doPost(
HttpServletRequest request,
HttpServletResponse response)
throws ServletException, IOException {
processRequest(request, response);
private void processRequest(HttpServletRequest request,
HttpServletResponse response) throws ServletException, IOException{
String mySqlJndiName =
this.getServletContext().getInitParameter("MySql JNDI");
createClaimsBean cb = new createClaimsBean();
String bd = request.getParameter("textfield1");
String pl = request.getParameter("textfield2");
String pa = request.getParameter("textfield3");
String bn = request.getParameter("textfield3");
String d = request.getParameter("D1");
String ta = request.getParameter("textfield4");
System.out.println("n");
cb=cb.registerCreateClaims(bd, pl, pa, bn, d, ta, mySqlJndiName);
request.getSession().setAttribute("registerCreateClaims", cb);
request.getRequestDispatcher("/WEB-INF/pages/regsuccess.jsp").forward(request,
response);
Lastly it is the java file.
Created on Apr 19, 2007
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package bean;
import Database.DataRetriever;
@author Administrator
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public class createClaimsBean {
     private String billDate;
     private String plans;
     private String panel;
     private String billNo;
     private String dependent;
     private String totalAmt;
     public createClaimsBean(String billDate,String plans,String panel,String billNo,String dependent,String totalAmt)
          this.billDate = billDate;
          this.plans = plans;
          this.panel = panel;
          this.billNo = billNo;
          this.dependent = dependent;
          this.totalAmt = totalAmt;
@return
     public String getBillDate() {
          return billDate;
@return
     public String getBillNo() {
          return billNo;
@return
     public String getDependent() {
          return dependent;
@return
     public String getPanel() {
          return panel;
@return
     public String getPlans() {
          return plans;
@return
     public String getTotalAmt() {
          return totalAmt;
@param string
     public void setBillDate(String string) {
          billDate = string;
@param string
     public void setBillNo(String string) {
          billNo = string;
@param string
     public void setDependent(String string) {
          dependent = string;
@param string
     public void setPanel(String string) {
          panel = string;
@param string
     public void setPlans(String string) {
          plans = string;
@param string
     public void setTotalAmt(String string) {
          totalAmt = string;
     public createClaimsBean{
     public void registerCreateClaims(String mysql, String billNo, String dependent, String panel, String plans, String totalAmt)
     DataRetriever data = new  DataRetriever(mysql);
    String sql= "INSERT INTO claims VALUES (billDate, billNo, dependent, panel, plans, totalAmt)";
    data.execUpdateQuery(sql);
    data.terminate();
How to connect sql so that i m able to insert new data into the database?
Message was edited by:
        fatimah rasheed

Answer 1

Hi Fatimah,
You are on the right way. You need a DataSource to get Connection to the DB and execute queries through it. Have a look at <a href="http://help.sap.com/saphelp_nw04/helpdata/en/15/6d56f65fb59e4db97253c89c5cfefd/frameset.htm">this</a> page for more information on setting up a reference to the DataSource from your Web application.
The procedure for creating a custom DataSource is described <a href="http://help.sap.com/saphelp_nw04/helpdata/en/bb/69da54d8aedc419d46d9ea074e4d41/frameset.htm">here</a>. You can also <a href="http://help.sap.com/saphelp_nw04/helpdata/en/7f/d84b25d49846819d08e1c8ba03a9cd/frameset.htm">use the default DataSource</a>.
Hope it helps!
-Vladimir
PS. Don't use java.sql.DriverManager directly in a J2EE environment. It is designed for standalone usage in the J2SE environment. The recommended way for J2EE is to go through a <b>javax.sql.DataSource</b> object.