Se relier à la base de données dans Servlets

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Se relier à la base de données dans Servlets

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Un servlet peut créer un ou plusieurs Connectionobject dans sa méthode d'init () et les réutiliser dans son service (), doGet (), et méthodes de doPost (). Démontrait, l'exemple 9-4 montre que le servlet de consultation de téléphone récrit pour créer ses objets de raccordement à l'avance. Il emploie également HtmlSQLResult pour montrer les résultats. Noter que ce servlet emploie le conducteur de Sybase JDBC.

Raccordement de base de données de Servlets en utilisant la base de données de Mysql

// File: ShowBedrock.java

/* A servlet to display the contents of the MySQL Bedrock database */

import java.io.*;
import java.net.*;
import java.sql.*;
import java.text.*;
import java.util.*;
import javax.servlet.*;
import javax.servlet.http.*;

public class ShowBedrock extends HttpServlet
{
public String getServletInfo()
{
return "Servlet connects to MySQL database and displays result of a SELECT";
}

// Use http GET

public void doGet(HttpServletRequest request, HttpServletResponse response)
throws IOException, ServletException
{
String loginUser = "Dude1";
String loginPasswd = "SuperSecret";
String loginUrl = "jdbc:mysql://localhost:3306/bedrock";

response.setContentType("text/html"); // Response mime type

// Output stream to STDOUT
PrintWriter out = response.getWriter();

out.println("<html><head><title>Bedrock</title></head>");
out.println("<body><h1>Bedrock</h11>");

// Load the mm.MySQL driver
try
{
Class.forName("org.gjt.mm.mysql.Driver");
Connection dbcon = DriverManager.getConnection(loginUrl, loginUser, loginPasswd);
// Declare our statement
Statement statement = dbcon.createStatement();

String query = "select name, dept, ";
query += " jobtitle ";
query += "from employee ";

// Perform the query
ResultSet rs = statement.executeQuery(query);

out.println("<table border>");

// Iterate through each row of rs
while (rs.next())
{
String m_name = rs.getString("name");
String m_dept = rs.getString("dept");
String m_jobtitle = rs.getString("jobtitle");
out.println("<tr>" +
"<td>" + m_name + "</td>" +
"<td>" + m_dept + "</td>" +
"<td>" + m_jobtitle + "</td>" +
"</tr>");
}

out.println("</table>");

rs.close();
statement.close();
dbcon.close();
}
catch (SQLException ex) {
while (ex != null) {
System.out.println ("SQL Exception: " + ex.getMessage ());
ex = ex.getNextException ();
} // end while
} // end catch SQLException

catch(java.lang.Exception ex)
{
out.println("<html>" +
"<head><title>" +
"Bedrock: Error" +
"</title></head>\n<body>" +
"<p>SQL error in doGet: " +
ex.getMessage() + "</p></body></html>");
return;
}
out.close();
}
}

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Keywords: servlets database connection,open source database,how to database,ms access database,sql server database,connecting to database

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