Thanks! for the clarification.
but my second query was... suppose u have a method getRecords in a bean
which should(assume) return resultset.. now if any exception occurs in this
method i want to display a string (a custom error message) back in the JSP
page. Since the mthod is defined to send resultset it can't send String so
is it possible to invoke a method back in JSP page to print this error
message.
any other way apart from using errorpage!!!
At 08:46 AM 1/4/01 -0800, you wrote:
>>From: Hariharan N <[EMAIL PROTECTED]>
>>Reply-To: A mailing list about Java Server Pages specification and
>> reference <[EMAIL PROTECTED]>
>>To: [EMAIL PROTECTED]
>>Subject: Re: Executing SQL query in bean
>>Date: Thu, 4 Jan 2001 07:54:51 -0800
>>
>>Hi!
>> Are u sure the System.out.println will display the records in the JSP
>>page, think we have to use the JSP printWriter implicit object "out" to
>>display something in the JSP page.
>
> No, the System.out.println() does not print anything in the jsp file. You
>are right you need the out.println() instead. The use of the System... is
>for informative reasons. I just put it there in order to show you how it
>should be done. Actually the System.out would not print anything on the
>screen (unless you have a main method defined) but all the output will go
>into the default output files under the log directory of your JSP engine you
>are using.
>
>>Now this gives rise to..
>>1. Suppose we want to display something from a bean like System.out.println
>>in the JSP page,
>>do we have to pass the implicit out object to the bean or which way?
>>can we invoke a method say.. write() in the JSP page from a bean??
>
> If you want to display the records you can declare the method of type
>String (or Vector or ResultSet or anything you want) and return a specific
>value. Then call this method from inside the jsp file and all the data you
>want will be displayed in the jsp page. For example you can have.
>
> public void String printThis()
> {
> return "hello from printThis";
> }
>
>Inside the jsp you can have (if assume the reference to the class is myRef)
>
> out.println(myRef.printThis());
>
> This will print the "hello from printThis".
>
>
>>a jdbc question too..
>>what exactly is class.forName does....
>
> It loads the appropriate database drivers. In order to make the database
>to work you need the right drivers. The class.forName loads the proper
>classes (which are the drivers for the database). Every database has
>different drivers, so it depends on the database you are using what drivers
>you need to load.
>
>>
>>
>>At 03:15 AM 1/4/01 -0800, you wrote:
>> > In the bean put all the relevant commands in order to open the
>>connection
>> >with the database. Lets say that you have a method called
>> >
>> >public void openConnection()
>> >{
>> > try
>> > {
>> > // Load the database's drivers.
>> > Class.forName("database's drivers here");
>> >
>> > // Obtain connection with the database.
>> > Connection dbcon = DriverManager.getConnection("databse address
>> >here", "username here", "password here");
>> >
>> > // create new statemtn here.
>> > Statement stmt = dbcon.createStatement();
>> >
>> > String select = "SELECT * FROM <table name here>";
>> >
>> > // get the whole result set
>> > ResultSet rs = stmt.executeQuery(retrieve);
>> >
>> > // go through all rows
>> > while (rs.next())
>> > {
>> > System.out.println(rs.toString());
>> > }
>> >
>> > } // end try
>> > // If driver not found.
>> > catch (ClassNotFoundException cnfe)
>> > {
>> > System.out.println("Driver not found. " + cnfe);
>> > }
>> > catch (SQLException sqle)
>> > {
>> > System.out.println("Connection to the database could not be
>>established.
>> >" + sqle);
>> > }
>> >}
>> >
>> >Then define a bean in the jsp page using the <jsp:useBean> tag.
>> >
>> > Call the openConnection using the beans reference name (lets say that
>>the
>> >reference to the bean is called myBean) myBean.openConnection();
>> >this will open the connection with the database and will display all the
>> >data in the specified table.
>> >
>> > You can have two diffreent methods if you want. One to open the
>> >copnnection and the other to get the data. You can call them with the
>>same
>> >way. Do not forget to close the connection with the databse after you
>> >finish. Use the close() method in order to do it.
>> >
>> > Hope this helps.
>> >
>> >
>> >
>> >
>> >>From: Deepak Kumar <[EMAIL PROTECTED]>
>> >>Reply-To: A mailing list about Java Server Pages specification and
>> >> reference <[EMAIL PROTECTED]>
>> >>To: [EMAIL PROTECTED]
>> >>Subject: Executing SQL query in bean
>> >>Date: Thu, 4 Jan 2001 02:48:54 -0800
>> >>
>> >>Hi Friends,
>> >>
>> >>I want to write the code of JDBC connectivity in a
>> >>bean and then use the resultset in JSP page how can i
>> >>accomplish this.
>> >>
>> >>Thanks in advance.
>> >>Deepak Kumar
>> >>
>> >>__________________________________________________
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>> >>
>>
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>> >>
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