package com.jspservletcookbook;
import java.sql.*;
import javax.naming.Context;
import javax.naming.InitialContext;
import javax.naming.NamingException;
import javax.sql.*;
import javax.servlet.*;
import javax.servlet.http.*;
public class DbServlet extends HttpServlet {
DataSource pool;
public void init() throws ServletException {
Context env = null;
try{
env = (Context) new InitialContext().lookup("java:comp/env");
pool = (DataSource) env.lookup("jdbc/oracle-8i-athletes");
if (pool == null)
throw new ServletException("'oracle-8i-athletes' is an unknown DataSource");
} catch (NamingException ne) {
throw new ServletException(ne);
}
}
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, java.io.IOException {
String sql = "select * from athlete";
Connection conn = null;
Statement stmt = null;
ResultSet rs = null;
ResultSetMetaData rsm = null;
response.setContentType("text/html");
java.io.PrintWriter out = response.getWriter();
out.println("<html><head><title>Typical Database Access</title></head><body>");
out.println("<h2>Database info</h2>");
out.println("<table border='1'><tr>");
try{
conn = pool.getConnection();
stmt = conn.createStatement();
rs = stmt.executeQuery(sql);
rsm = rs.getMetaData();
int colCount = rsm.getColumnCount();
//print column names
for (int i = 1; i <=colCount; ++i){
out.println("<th>" + rsm.getColumnName(i) + "</th>");
}
// colCount= colCount -1;
out.println("</tr>");
while( rs.next()){
out.println("<tr>");
for (int i = 1; i <=colCount; ++i)
out.println("<td>" + rs.getString(i) + "</td>");
out.println("</tr>");
}
} catch (Exception e){
throw new ServletException(e.getMessage());
} finally {
try{
stmt.close();
conn.close();
} catch (SQLException sqle){ }
}
out.println("</table></body></html>");
out.close();
} //doGet
}
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