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POAccess to MySQL using Java Servlet?
 

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  1. POAccess to MySQL using Java Servlet?
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    <p>The Solution:</p> <p>I added this code</p> <pre><code>Class.forName("com.mysql.jdbc.Driver"); </code></pre> <p>brfore</p> <pre><code>Connection con = DriverManager.getConnection("jdbc:mysql://127.0.0.1:3306/test", "root", "root"); </code></pre> <p>Thank you all for reply my question</p> <p>====================</p> <p>I have problem, I try to insert data into mysql db using servlet, <strong>but I couldn'y access to MySQL</strong></p> <ul> <li>Database name: test</li> <li>Table name: test</li> <li>I already added jdbc connector to the project library</li> <li>I'm using JDK 1.7, NetBeans 7.3, MySQL 5.6, Tomcat 7.0, Connector/J 5.1.24</li> </ul> <p><strong>1- this is "form action" in sign_up.jsp page:</strong></p> <pre><code>&lt;form action="RegisterUser" method="post"&gt; &lt;td&gt;&lt;input type="submit" value="Submit"&gt;&lt;/td&gt; &lt;/form&gt; </code></pre> <p><strong>2- this is RegisterUser.java servlet:</strong></p> <pre><code>import java.io.IOException; import javax.servlet.ServletException; import javax.servlet.annotation.WebServlet; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import com.mysql.jdbc.Driver; import java.sql.Connection; import java.sql.DriverManager; import java.sql.SQLException; import java.sql.Statement; import java.util.logging.Level; import java.util.logging.Logger; @WebServlet(urlPatterns = {"/RegisterUser"}) public class RegisterUser extends HttpServlet { protected void processRequest(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException, SQLException { try{ Connection con = DriverManager.getConnection("jdbc:mysql://localhost/test", "root", "root"); Statement s = (Statement) con.createStatement(); String name = "Hassan3"; int phone = 123456; String insert = "INSERT INTO test VALUES ('\" + name + \"', \" + phone + \")"; s.executeUpdate(insert); s.close(); con.close(); }catch(Exception e){ throw new SecurityException("Class not found " + e.toString()); } } @Override protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { try { processRequest(request, response); } catch (SQLException ex) { Logger.getLogger(RegisterUser.class.getName()).log(Level.SEVERE, null, ex); } } @Override protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { try { processRequest(request, response); } catch (SQLException ex) { Logger.getLogger(RegisterUser.class.getName()).log(Level.SEVERE, null, ex); } } @Override public String getServletInfo() { return "Short description"; }// &lt;/editor-fold&gt; </code></pre> <p>}</p> <p><strong>3- the exception result:</strong></p> <pre><code>HTTP Status 500 - Class not found java.sql.SQLException: No suitable driver found for jdbc:mysql://localhost/test type Exception report message Class not found java.sql.SQLException: No suitable driver found for jdbc:mysql://localhost/test description The server encountered an internal error that prevented it from fulfilling this request. exception java.lang.SecurityException: Class not found java.sql.SQLException: No suitable driver found for jdbc:mysql://localhost/test RegisterUser.processRequest(RegisterUser.java:66) RegisterUser.doPost(RegisterUser.java:173) javax.servlet.http.HttpServlet.service(HttpServlet.java:647) javax.servlet.http.HttpServlet.service(HttpServlet.java:728) note The full stack trace of the root cause is available in the Apache Tomcat/7.0.39 logs. </code></pre> <p><strong>4- But when I use same code but in java file "without servlet or web app" it's working correctly:</strong></p> <pre><code>import java.sql.Connection; import java.sql.DriverManager; import java.sql.Statement; public class Test { public static void main(String[] args){ try{ Connection con = DriverManager.getConnection("jdbc:mysql://localhost/test", "root", "root"); Statement s = (Statement) con.createStatement(); String name = "Hassan4"; int phone = 8985895; String insert = "INSERT INTO test VALUES ('" + name + "', " + phone + ")"; s.executeUpdate(insert); s.close(); con.close(); System.out.println("done"); }catch(Exception e){ throw new SecurityException("Class not found " + e.toString()); } } </code></pre> <p>}</p> <p>so what is problem with servlet? <strong>Why the code works with java app. but it doesn't work with web app.?</strong></p>
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    1. USHassan Al-Shehari
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