Comments on: Accessing MySQL on NetBeans using JDBC, Part II: Perform SQL Operations

By: halima

halima — Mon, 08 Mar 2010 10:37:35 +0000

hey i retrieved all da records from the database in an table(i hav 5 columns i.e,- rollnumber,name,father’s name,address,ph).I have made da rollnumber as an link, so when i click on one particular rollnumber i should get all da columns of dat record in an table so dat i can edit and update it using servlet…
How to do it….???

By: halima

halima — Sat, 06 Mar 2010 14:07:52 +0000

hey i tried in other system ,its working perfectly but i dont know wat’s da error….
plz help me with other query to retrieve a record , whatever user selects…

By: Sitti

Sitti — Fri, 05 Mar 2010 07:05:52 +0000

Thank linglom.. great help… I’m able to start working on it.. ♥

By: linglom

linglom — Thu, 04 Mar 2010 15:10:37 +0000

Hi, Halima

I suggest you print out your query on output window and copy it to run on SQL Server directly to see if there is any error or not.

By: halima

halima — Wed, 03 Mar 2010 14:57:34 +0000

hey the records are getting inserted in table properly,but when i am trying to retrieve a single row i am getting a blank page. when i retrieve da whole table it is retrieving… but for one particular row it is not….
my query is : “select * from stu_detail where std_rollno=+ num +”
( String num=request.getParameter(“stdrollnumber”);
when i enter student roll number i am supposed to get student name,father’s name,address and contact no in the same page inside the textboxes.

By: linglom

linglom — Tue, 02 Mar 2010 02:07:07 +0000

Hi, Sitti
First, I thought that your MySQL is on remote machine. So if it on the local machine, I suggest you to change the connection string “localhost” to your real ip address of the machine.

Also, have you forgot username and password on the connection string?

By: Sitti

Sitti — Fri, 26 Feb 2010 09:39:01 +0000

Hi linglom,
Nothing change when I disable the firewall… How do i check for if MySQL is accepting the connection?? Is my connection string correct?? =)

try
{
Class.forName(“com.mysql.jdbc.Driver”);
String connectionUrl = “jdbc:mysql://localhost/Northwinds?;”;
Connection con = DriverManager.getConnection(connectionUrl);
}
catch (SQLException e)
{
System.out.println(“SQL Exception: “+ e.toString());
}
catch (ClassNotFoundException cE)
{
System.out.println(“Class Not Found Exception: “+ cE.toString());
}

By: linglom

linglom — Fri, 26 Feb 2010 03:06:49 +0000

Hi, Sitti
Check if the MySQL is accepting the connection from your application. Or if there is any firewall blocking.

By: Sitti

Sitti — Thu, 25 Feb 2010 06:45:08 +0000

I followed ur instruction step by step.. it successfully build but fail to run..

SQL Exception: com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure.

The last packet sent successfully to the server was 0ms ago. The driver has not received any packets from the server.

Why is this so? What should I check in this case?

Java Beginner

By: linglom

linglom — Wed, 06 Jan 2010 03:42:51 +0000

Hi, Veronica
Is there any error message? First, you should try to test if the SQL query’s syntax is correct by print out the query to console window and copy it to run on the SQL Server.