Home ›

Creating Queries

Issue 73

From Issue #73
May 2000

May 01, 2000  By Reuven M. Lerner
 in
Don't be afraid of large joins—learn to generate complex SQL queries from easy-to-use interfaces.
Conclusion

While it is tempting to give users infinite freedom to enter information into a web site, it is usually best to limit their inputs as much as possible. Creating simple HTML-based query generators is not difficult and can even be easy once you get the hang of it. The trick is to formulate queries in such a way that the user can get the maximum information while knowing as little as possible about the underlying database. Even when the queries are easy to create, finding ways to turn those queries into language suitable for non-programmers can be a challenge.

Resources

Reuven M. Lerner , an Internet and Web consultant, moved to Modi'in, Israel following his November marriage to Shira Friedman-Lerner. His book Core Perl will be published by Prentice-Hall in the spring. Reuven can be reached at reuven@lerner.co.il. The ATF home page, including archives, source code and discussion forums, is at http://www.lerner.co.il/atf/.

______________________

Comments

Comment viewing options

Select your preferred way to display the comments and click "Save settings" to activate your changes.

Hi Friends, I am working on

Anonymous's picture
Submitted by Anonymous (not verified) on Thu, 01/27/2005 - 00:39.

Hi
Friends,
I am working on USB OHCI 1.1. driver on pxa27x. The kernel i am using is 2.6.10 that come up with ohci-pxa2x7x code.

I am using only port 1.
The problem arise when driver code gives reset to port 1 (BY SETTING 1 TO UHCRHPS1[PRS]). This reset in turn should enable the port UHCRHPS1[PES](make it 1) , but its not doing that and it also showing UHCRHPS1[PRSC]=1 (port reset complete), UHCRHPS1[CSC]=1 (connect status change), UHCRHPS1[PESC]=1 (port enable status change).

The following is the error that i am facing.

"hub 1-0:1.0: Cannot enable port 1. Maybe the USB cable is bad?"

I am using per port power mode. Its also not showing overcurrent condition for port 1.
The following are the status of registers while this error occured.

UHCREV = 10
UHCHCON = 83
UHCCOMS = 0
UHCINTS = 44
UHCINTE = 8000001a
UHCINTD = 8000001a
UHCHCCA = a03e5000
UHCPCED = 0
UHCCHED = 0
UHCCCED = 0
UHCBHED = 0
UHCBCED = 0
UHCDHEAD = 0
UHCFMI = 27782edf
UHCFMR = 2dc
UHCFMN = 1656
UHCPERS = 2a2f
UHCLST = 628
UHCRHDA = 4000902
UHCRHDB = e0000
UHCRHS = 8000
UHCRHPS1 = 130301
UHCRHPS2 = 8
UHCRHPS3 = 8
/*--non ohci registers*/
UHCSTAT = 0
UHCHR = 44
UHCHIE = 2080
UHCHIT = 0

If anybody might come across such problme or anybody has some idea about it, then please share your idea.

Webcast
More Resources
How to Build an Optimal Hadoop Cluster to Store and Maintain Unlimited Amounts of Data Using Microservers

Realizing the promise of Apache® Hadoop® requires the effective deployment of compute, memory, storage and networking to achieve optimal results. With its flexibility and multitude of options, it is easy to over or under provision the server infrastructure, resulting in poor performance and high TCO. Join us for an in depth, technical discussion with industry experts from leading Hadoop and server companies who will provide insights into the key considerations for designing and deploying an optimal Hadoop cluster.

Learn More

Sponsored by AMD

White Paper
More Resources
Private PaaS for the Agile Enterprise

If you already use virtualized infrastructure, you are well on your way to leveraging the power of the cloud. Virtualization offers the promise of limitless resources, but how do you manage that scalability when your DevOps team doesn’t scale? In today’s hypercompetitive markets, fast results can make a difference between leading the pack vs. obsolescence. Organizations need more benefits from cloud computing than just raw resources. They need agility, flexibility, convenience, ROI, and control.

Stackato private Platform-as-a-Service technology from ActiveState extends your private cloud infrastructure by creating a private PaaS to provide on-demand availability, flexibility, control, and ultimately, faster time-to-market for your enterprise.

Learn More

Sponsored by ActiveState