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Oracle

Posted May 25, 2005

Oracle on the Web, Part 2 - Oracle 10g's HTTP Server and HTML DB - Page 2

By Steve Callan

The HTML DB

From Oracle's HTML User's Guide:

Oracle HTML DB is a hosted declarative development environment for developing and deploying database-centric Web applications. Oracle HTML DB turns a single Oracle database into a shared service by enabling multiple workgroups to build and access applications as if they were running in separate databases. Thanks to built-in features such as design themes, navigational controls, form handlers, and flexible reports, Oracle HTML DB accelerates the application development process.

The Oracle HTML DB development platform consists of the following components:

  • Application Builder
  • SQL Workshop
  • Data Workshop

These components, by way of the HTTP server, are what make the Oracle HTTP Server and HTML DB so useful.

How to connect to the HTML DB

After the HTML DB is created, (it takes around 35 minutes on a fairly fast XP), your first stop is the Service Administration site. From here, you can manage workspaces and developers.

The generic URI shown in most of Oracle's documentation has

http://server:port/pls/Database Address Descriptor/htmldb

The missing link here is what replaces the DAD. Assuming the port is 7777, the URI is

http://server:7777/pls/htmldb/htmldb ("htmldb" replaces the DAD).

At the Service Administration URI (change the end part of the URI to htmldb_admin), you log in as a privileged user (the HTML DB DBA who assigns workspaces). Two key functional areas are managing the DB service and managing the workspaces. HTML DB comes with several sample schemes, but they cannot be accessed until you create/provision a new workspace and then log in to it. Select "Create New Workspace" on the page (similar to what is shown below).

Tip: When provisioning the new workspace, be generous and assign a larger space quota. If you select "Medium: 5 Megabytes," you will not be able to run/load all of the demos. Finish provisioning the new workspace and then exit the service administration interface.

Navigate to the non-admin URI and enter the name of the workspace, username, and password. OTN has other sample HTML DB's you can use. One of their examples uses a workspace and username of "obe." Part way through the installation - especially if you are having technical difficulties - it is not hard to imagine that "obe" was short for "overcome by events."

The page you see after logging in:

Once you are in as a user, look at the "Review Demonstration Applications" link on the right side.

The first one has already been installed you for.

One other administrative chore

Everything installed by OUI in the two sessions has a service property of starting automatically. One essential component that must be manually restarted is OPMN. This part is nearly identical to starting OPMN in Application Server.

Navigate to ORACLE_HOME\opmn\bin of the companion products and run opmnctl startall. You can also check the status via opmnctl status.

In Closing

There are quite a few steps needed to reach the basic HTML DB demonstration examples. The two-part installation is similar to what is required of Application Server, and at the end, you have an extra ORACLE_HOME to manage. Because applications and data can be manipulated or altered through the HTML DB interface, the idea of an HTML DB DBA (or administrator) makes sense. In the next part of this series, we will look at using the workshop components.

» See All Articles by Columnist Steve Callan



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