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Help How to Connect MySQL from JSP Page

  #1  
Feb 17th, 2007
As I am new to MySQL, I dont know how to connect my jsp page to the MySQL Database.
So please help me by giving some code on how to connect.
I have downloaded driver for Java named as Connector/J.
MySQL version is 5.0.
In this line
con = DriverManager.getConnection("jdbc:mysql://localhost/JSP_MYSQL?user=root&password=admin");

what is wrong where i have to give MySQL username and password and the name of the Database.

So please help me out.

It's Urgent.

Thanks..
<%! 
  Connection con = null;
  Statement state = null;
  ResultSet rs = null;
%>
<%
 try
 {
  Class.forName("com.mysql.jdbc.Driver").newInstance();
  con = DriverManager.getConnection("jdbc:mysql://localhost/JSP_MYSQL?user=root&password=admin");
  state = con.createStatement();
  String s = "Select * from user.login";
  rs = state.executeQuery(s);
 }
 
 catch(SQLException e)
 {
  e.printStackTrace();
 }
 
%>
Last edited by Dhruv Shah : Feb 17th, 2007 at 3:20 am.
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Re: How to Connect MySQL from JSP Page

  #2  
Feb 17th, 2007
First thing, please do not use JSP to connect to database. Pass data to servlet for validation, or use JavaScript to valildate them in JSP, and setup connection inside servlet and then by the needs go back to previous page to pick up correct/new data or move to nex page
this is usual peace of code which I re-use often
public class SomeClassName extends HttpServlet
{
Connection conn;
Statement stmt;
	
public void init() throws ServletException
{
	try
	{
		Class.forName("com.mysql.jdbc.Driver").newInstance();
	}
	catch (Exception ex)
	{
		System.out.println("Exception is : " + ex.toString() );
	}
}
	
public void doPost( HttpServletRequest request, HttpServletResponse response) throws IOException, ServletException
{
	try
	{
		conn = DriverManager.getConnection("jdbc:mysql://localhost/" 
													+ "database_name?user=my_username&password=my_password");
		stmt = conn.createStatement();
	}
	catch(SQLException ex)
	{
		System.out.println("SQLException : " + ex.getMessage() );
	}

PS: I will request this post to be move to JSP section, it is where it actualy belong and where you can find more similar questions and answers
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Help Re: How to Connect MySQL from JSP Page

  #3  
Mar 29th, 2007
Hi I have used the same code to work at my end but it still giving me error, i just modified code to replace my database name and other specifications:

Here is teh code :

<%@ page import="java.sql.*" %>
<html><body>
<%
public class SomeClassName extends HttpServlet
{
Connection conn;
Statement stmt;

public void init() throws ServletException
{
try
{
Class.forName("com.mysql.jdbc.Driver").newInstance();
}
catch (Exception ex)
{
System.out.println("Exception is : " + ex.toString() );
}
}

public void doPost( HttpServletRequest request, HttpServletResponse response) throws IOException, ServletException
{
try
{
conn = DriverManager.getConnection("jdbc:mysql://localhost:8009/" + "login?user=root&password=asma");
stmt = conn.createStatement();
}
catch(SQLException ex)
{
System.out.println("SQLException : " + ex.getMessage() );
}
%>
</body></html>

I m using:
  • For TOMCAT -- apache-tomcat-5.5.23
  • For JRE -- Java EE 5 SDK
  • For database -- MySQL 5.0.37
  • For JDBC -- mysql-connector-java-3.0.17
Here is the Error:

type Exception report
message
description The server encountered an internal error () that prevented it from fulfilling this request.

exception org.apache.jasper.JasperException: Unable to compile class for JSP: Stacktrace: org.apache.jasper.compiler.DefaultErrorHandler.javacError(DefaultErrorHandler.java:85) org.apache.jasper.compiler.ErrorDispatcher.javacError(ErrorDispatcher.java:330) org.apache.jasper.compiler.JDTCompiler.generateClass(JDTCompiler.java:435) org.apache.jasper.compiler.Compiler.compile(Compiler.java:298) org.apache.jasper.compiler.Compiler.compile(Compiler.java:277) org.apache.jasper.compiler.Compiler.compile(Compiler.java:265) org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:564) org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:299) org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:315) org.apache.jasper.servlet.JspServlet.service(JspServlet.java:265) javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
note The full stack trace of the root cause is available in the Apache Tomcat/5.5.23 logs.

Please help me i'll be grateful
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Re: How to Connect MySQL from JSP Page

  #4  
Apr 14th, 2008
hi,
u hve to copy a file fom jdk\lib\tools.jar file and paste it into tomcat 5.0\common\lib
after doing this u can compile your jsp file..
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Re: How to Connect MySQL from JSP Page

  #5  
May 5th, 2008
Originally Posted by peter_budo View Post
First thing, please do not use JSP to connect to database. Pass data to servlet for validation, or use JavaScript to valildate them in JSP, and setup connection inside servlet and then by the needs go back to previous page to pick up correct/new data or move to nex page
this is usual peace of code which I re-use often
public class SomeClassName extends HttpServlet
{
Connection conn;
Statement stmt;
	
public void init() throws ServletException
{
	try
	{
		Class.forName("com.mysql.jdbc.Driver").newInstance();
	}
	catch (Exception ex)
	{
		System.out.println("Exception is : " + ex.toString() );
	}
}
	
public void doPost( HttpServletRequest request, HttpServletResponse response) throws IOException, ServletException
{
	try
	{
		conn = DriverManager.getConnection("jdbc:mysql://localhost/" 
													+ "database_name?user=my_username&password=my_password");
		stmt = conn.createStatement();
	}
	catch(SQLException ex)
	{
		System.out.println("SQLException : " + ex.getMessage() );
	}

PS: I will request this post to be move to JSP section, it is where it actualy belong and where you can find more similar questions and answers



How do I implement this class in JSP page ?

Thanks,

Kusno.
NEVER NEVER NEVER GIVE UP
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Re: How to Connect MySQL from JSP Page

  #6  
May 5th, 2008
This class is the JSP. JSP is an extension of Servlet. Simply told. If you see a few pages up on this article you see how to create a connection in JSP. But as i already had sead. Don't use connection or other business related code inside JSP. It makes it more difficult to read Tags and Java code. Move the Connection and Query code down in a DAO layer and use Servlet class as controler. Put the data you want into a JavaBean and put it into Request or session. Get it back in the JSP page and view it. If you need help in how to implement it give me a reply
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Re: How to Connect MySQL from JSP Page

  #7  
May 5th, 2008
Originally Posted by electron33 View Post
This class is the JSP. JSP is an extension of Servlet. Simply told. If you see a few pages up on this article you see how to create a connection in JSP. But as i already had sead. Don't use connection or other business related code inside JSP. It makes it more difficult to read Tags and Java code. Move the Connection and Query code down in a DAO layer and use Servlet class as controler. Put the data you want into a JavaBean and put it into Request or session. Get it back in the JSP page and view it. If you need help in how to implement it give me a reply


Dear Mr. Electron33,

Yes, I want to know how to implement it.

Please...
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Re: How to Connect MySQL from JSP Page

  #8  
May 5th, 2008
Here is an example of how I have done it so far. It is build in Netbeans 5.5
Attached Files
File Type: zip DatabaseConnection in JSP.zip (1.69 MB, 73 views)
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Re: How to Connect MySQL from JSP Page

  #9  
Feb 17th, 2007
also, ALWAYS close database resources after use.
And your connect string looks really weird.
Normally you'd pass username and password separately.
As people are clearly allowed to attack me but I'm not allowed to defend myself, I no longer post to this site.
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Re: How to Connect MySQL from JSP Page

  #10  
Feb 17th, 2007
jwenting, can I ask why to pass username and password seperately? Is there any particular reason or it is your profesional recomodation? I'm interested as I usualy do it the way as the code above shows...
Last edited by peter_budo : Feb 17th, 2007 at 5:06 pm.
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