JDBCDemo. demonstrates basic JDBC functionality via an Applet

ScrollDemo. demonstrates JDBC functionality via an Applet. It also demonstrates the additional Resultset navigation functionality provided by OpenLink's Scrollable Resultset & RowSet Extensions for JDBC on a Record by Record Basis.

ScrollDemo2. demonstrates JDBC functionality via an Applet. It also demonstrates the additional Resultset navigation functionality provided by JDBC 2.0

RowSetDemo. demonstrates JDBC functionality via an Applet. It also demonstrates the additional Resultset navigation functionality provided by OpenLink's Scrollable Resultset & RowSet Extensions for JDBC on a RowSet by RowSet Basis.

Start the OpenLink Request Broker

Start up your Web Browser

Enter one of the following URLs into your browser depending on the location of your OpenLink Request Broker:

Local To you:

http://localhost:8000

Remote Server:

http://<hostname or IP address of remote server>:8000

	Note:
	Port "8000" presumes that you provide this value when prompted during your OpenLink Sever components installation.

Follow the Admin Assistant's Menu tree to the location of the "Sample Applications->JDBC Applet Demos" menu item. The graphic below depicts this process.

Figure8.7.JDBC Applet Demos

Click on the hyperlink that reads "Applet demonstration with OpenLink Software JDBC Driver"

Use the Applet's File->Set Connection URL menu item set a URL pointing to an ODBC or UDBC DSN. If uncertain follows the instructions laid out in the section covering OpenLink JDBC URL formats which shows you how to construct Type 1, 2, and 3 URL formats for your OpenLink Drivers for JDBC. This applet will run with non OpenLink Drivers for JDBC but you will need to obtain URL construction information from the relevant driver vendor.

The line below depicts the URL construction dialog presented:

        jdbc:openlink://localhost/DSN=WebJDBCDemo

Enter a valid SQL statement for the back end database that you are connecting to via JDBC and then click on the "Query" button. The screen shot below depicts this process:

Figure8.8.WebJDBC Applet Demo

Basic JDBC 1.1 functionality provides Forward-Only as opposed to Bi-Directional record Scrolling, this is why the basic JDBC applet on has a "Next" button. When you click on the "Next" button you are moved to the next record in your JDBC resultset, unfortunately you have to hit the "Query" button again and re-start the Forward-Only resultset navigation if you need to see the First or Prior resultset records from your current position. The examples that follow show how OpenLink and the new release of JDBC (version 2.0) address the Bi-Directional Scrolling Limitation demonstrated by this Applet.

Start the OpenLink Request Broker.

Start up your Web Browser

Enter one of the following URLs into your browser depending on the location of your OpenLink Request Broker:

Local To you:

http://localhost:8000

Remote Server:

http://<hostname or IP address of remote server>:8000

	Note:
	Port "8000" presumes that you provide this value when prompted during your OpenLink Sever components installation.

Follow the Admin Assistant's Menu tree to the location of the "JDBC Applet Demos" menu item. The graphic below depicts this process.

Figure8.9.WebJDBC Applet Demo

Click on the hyperlink that reads "Applet demonstration with OpenLink Software JDBC Scrollable Cursor extensions"

Use the Applet's File->Set Connection URL menu item set a URL pointing to an ODBC or UDBC DSN. If uncertain follows the instructions laid out in the section covering OpenLink JDBC URL formats which shows you how to construct Type 1, 2, and 3 URL formats for your OpenLink Drivers for JDBC.

The line below depicts the URL construction dialog presented:

jdbc:openlink://localhost/DSN=WebScrollDemo

Enter a valid SQL statement for the back end database that you are connecting to via JDBC and then click on the "Query" button. The screen shot below depicts this process:

Figure8.10.WebScroll Applet Demo

JDBC 1.1 functionality provides Forward-Only as opposed to Bi-Directional Resultset Scrolling, OpenLink's Scrollable Resultset Extensions for JDBC enable Bi-Directional Resultset Scrolling. This is why this applet has an additional set of Resultset Navigation buttons: "First","Next", "Prior","Last", "Lock", "Unlock", "Add", "Update", "Get Bookmark", "Set Bookmark", "and Go To". The existence of Bi-directional Scrollable Result sets (or Cursors) is often presumed by end-users and developers alike, its importance rarely understood prior to embarking upon JDBC application development or product selection, the unfortunate consequence being complex application re-writes or implementation of sub par JDBC solutions. Each of the button in the applet demo is explained below so as to understand the magnitude of this issue:

Start the OpenLink Request Broker

Start up your Web Browser

Enter one of the following URLs into your browser depending on the location of your OpenLink Request Broker:

Local To you:

http://localhost:8000/

Remote Server:

http://<hostname or IP address of remote server>:8000

	Note:
	Port "8000" presumes that you provide this value when prompted during your OpenLink Sever components installation.

Follow the Admin Assistant's Menu tree to the location of the "Sample Applications->JDBC Applet Demos" menu item. The graphic below depicts this process.

Figure8.11.Scroll2 Applet Demo

Click on the hyperlink that reads "Applet demonstration with OpenLink Software JDBC 2.0 Scrollable Cursors"

Use the Applet's File->Set Connection URL menu item set register your Driver for JDBC 2.0 and then enter a URL pointing to an ODBC or UDBC DSN. If uncertain follow the instructions laid out in the section covering OpenLink JDBC URL formats which shows you how to construct Type 1, 2, and 3 URL formats for your OpenLink Drivers for JDBC. This applet will run with non OpenLink Drivers for JDBC but you will need to obtain Driver registration and JDBC URL construction information from the relevant Driver vendor.

The screen shot below depicts the URL construction dialog presented:

Figure8.12.Connection dialog

Enter a valid SQL statement for the back end database that you are connecting to via JDBC and then click on the "Query" button.

JDBC 1.1 functionality provides Forward-Only as opposed to Bi-Directional Resultset Scrolling, JDBC 2.0 on the other hand supports Bi-Directional Resultset Scrolling. As a result this applet has an additional set of Resultset Navigation buttons: "First","Next", "Previous","Last", "Insert", "Update", "Absolute", "Relative". Unfortunately JDBC 2.0 does not provide Bookmarking or Row Level concurrency control hence the exclusion of the "Lock", "UnLock", "Go To", "Set Bookmark", "Get Bookmark" navigation buttons provided in the "ScrollDemo" applet. To use this functionality in a JDBC 2.0 environment you simply make use of the OpenLink Scrollable ResultSet & RowSet Extensions.

Each navigation button is described below so as to shed more light on the Scrollable ResultSet functionality provided by JDBC 2.0.

Start the OpenLink Request Broker

Start up your Web Browser

Enter one of the following URLs into your browser depending on the location of your OpenLink Request Broker:

Local To you:

http://localhost:8000

Remote Server:

http://<hostname or IP address of remote server>:8000

	Note:
	Port "8000" presumes that you provide this value when prompted during your OpenLink Sever components installation.

Follow the Admin Assistant's Menu tree to the location of the "Sample Applications->JDBC Applet Demos" menu item. The graphic below depicts this process.

Figure8.13.Connection dialog

Click on the hyperlink that reads "Applet demonstration with OpenLink Software JDBC Scrollable Cursor RowSet Extensions"

Use the Applet's File->Set Connection URL menu item set a URL pointing to an ODBC or UDBC DSN. If uncertain follows the instructions laid out in the section covering OpenLink JDBC URL formats which shows you how to construct Type 1, 2, and 3 URL formats for your OpenLink Drivers for JDBC. This applet will run with non OpenLink Drivers for JDBC but you will need to obtain URL construction information from the relevant driver vendor.

The screen shot below depicts the URL construction dialog presented:

Figure8.14.URL Construction

Enter a valid SQL statement for the back end database that you are connecting to via JDBC and then click on the "Query" button. The screen shot below depicts this process:

Figure8.15.Querying

JDBC 1.1 functionality provides Forward-Only as opposed to Bi-Directional Resultset Scrolling, JDBC 2.0 provides Scrollable Result sets but does not provide Bookmarking or Attached RowSets (transient RowSets located in the same process space as the ResultSet). OpenLink's Scrollable Resultset Extensions for JDBC address these issues irrespective of JDBC version. As a result this applet has an additional set of Resultset Navigation buttons when compared to the basic JDBC 2.0 Applet in the prior section, the buttons are: "First","Next", "Prior","Last", "Lock", "Unlock", "Add", "Update", "Get Bookmark", "Set Bookmark", "and Go To" . The existence of transient RowSets due to Bi-directional Scrollable Result sets (or Cursors) in JDBC 2.0 is more than likely presumed to exist by end-users and developers alike, it is important that you take note of this before embarking upon JDBC 2.0 application development or product selection. Each of the buttons in the Applet demo is explained below so as to assist in the understanding of these matters: