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Sql Injection Prevention

To protect your application from SQL injection, perform the following steps: * Step 1. Constrain input. * Step 2. Use parameters with stored procedures. * Step 3. Use parameters with dynamic SQL.

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Oracle Magazine, January/February 2009

Oracle Magazine January/February features articles on Oracle Exadata, Oracle grid infrastructure, Oracle embedded databases, Oracle WebLogic Server, encrypting Tablespacess, managing database resources, Tom Kyte on Dynamic Sampling, easier interactive data entry, coding PL/SQL, tips on Oracle Application Express and much more.

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Framework for developing front-end with back-end as REST

- by Noor

Currently I'm developing the back-end of a PHP application using Recess Framework. I'm almost done and I now need to do the front-end. I have many alternatives and I prefer a CMS. The alternatives in my knowledge are Drupal or Wordpress. The problem is that I've never used Drupal and Wordpress(or any better). Thus I don't which one to choose to develop the app to interact with the REST interface.Can you help me in choosing the best CMS for interacting with the REST interface

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Rhythmbox is not launching

- by Somogyi László

I'm using Rhythmbox 2.99 in Ubuntu 13.10, and when I first launch the application it searches for music and works like a charm, but if I try to launch it later again nothing happens. When I run it in terminal I get this: $ rhythmbox (rhythmbox:8860): GLib-GObject-CRITICAL **: Custom constructor for class SoupServer returned NULL (which is invalid). Unable to remove object from construction_objects list, so memory was probably just leaked. Please use GInitable instead. Segmentation fault Any ideas how to make it work again?

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What strategy to use when starting in a new project with no documentations?

- by Amir Rezaei

Which is the best why to go when there are no documentations? For example how do you learn business rules? I have done the following steps: Since we are using a ORM tool I have printed a copy of database schema where I can se relations between objects. I have made a list of short names/table names that I will get explained. The project is client/server enterprise application using MVVM pattern.

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Best approach for saving highlighted areas on geographical map.

- by Mohsen

I am designing an application that allow users to highlight areas of a geographical map using a tool that is like brush or a pen. The tool basically draw a circle with a single click and continue drawing those circles with move move. Here is an example of drawing made by moving the tool. It is pretty much same as Microsoft Paint. Regardless of programming language what is best approach (most inexpensive approach) for saving this kind of data?

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How to fix “Cannot connect to the configuration database.”

- by ybbest

The problem: When I browse to a SharePoint site, I got the Server Error in ‘/’ Application, Cannot connect to the configuration database. The Analysis: The reason you get the message is that SharePoint WFE cannot connect to the SQL database, you need to check the weather SQL server service is started as shown below. Solution: When checking the SQL Server service, I see it is not started. After starting the service, it works like a charm.

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Review: Snap Spiffy Linux Screenshots with Shutter

Paul Ferrill introduces us to the Shutter screen grab for Linux application. Shutter offers a simple interface and a whole lot of functionality. including cursor capture, whole Web page capture, and annotations.

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MEF, Silverlight and the HVP

This article is part of the Mini-Tutorial Series Executive Summary This article continues the design and exploration phase of the Silverlight HVP project by beginning to examine the role the Managed Extensibility Framework (MEF) will play in solving a number of challenges in the project. Goal: Creation of an Extensible, Modular, Reliable, Robust application The Silverlight HVP poses the [...]...Did you know that DotNetSlackers also publishes .net articles written by top known .net Authors? We already have over 80 articles in several categories including Silverlight. Take a look: here.

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Displaying the same page, no matter what URI

- by jgauffin

We have moved a webapplication and would like to display a message in the old IIS. Let's say that the application was in http://oldserver/appname/. How do I make sure that our moved.html is displayed to the user no matter which uri the user browsed in to (in that virtual folder)? http://oldserver/appname/some/path.aspx --- should display http://oldserver/appname/moved.html http://oldserver/appname -- should display http://oldserver/appname/moved.html

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Snap Spiffy Linux Screenshots with Shutter

<b>LinuxPlanet:</b> "Paul Ferrill introduces us to the Shutter screen grab for Linux application. Shutter offers a simple interface and a whole lot of functionality. including cursor capture, whole Web page capture, and annotations."

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Hey Adobe, Dump Apple, Go Linux

<b>Cyber Cynic:</b> "Who can blame Adobe for being ticked off? They wanted a slice of the lucrative Apple iPad/iPhone application business, and Apple won't let Adobe applications, or even Flash, on either platform."

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Facebook: Releasing Flashcache

<b>Facebook:</b> "We built Flashcache to help us scale InnoDB/MySQL, but it was designed as a generic caching module that can be used with any application built on top of any block device."

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Many-to-many relationships in pharmacology

- by John Paul Cook

When I was in my pharmacology class this morning, I realized that the instructor was presenting a classic relational database management system problem: the many-to-many relationship. He said that all of us in nursing school must know our drugs backwards and forwards. I know how to model that! There are so many things in both healthcare and higher education that could benefit from an appropriate application of technology. As a student, I'd like to be able to start with a drug, a disease, a name of...(read more)

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Stairway to T-SQL DML Level 5: The Mathematics of SQL: Part 2

Joining tables is a crucial concept to understanding data relationships in a relational database. When you are working with your SQL Server data, you will often need to join tables to produce the results your application requires. Having a good understanding of set theory, and the mathematical operators available and how they are used to join tables will make it easier for you to retrieve the data you need from SQL Server.

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Organization & Architecture UNISA Studies – Chap 4

- by MarkPearl

Learning Outcomes Explain the characteristics of memory systems Describe the memory hierarchy Discuss cache memory principles Discuss issues relevant to cache design Describe the cache organization of the Pentium Computer Memory Systems There are key characteristics of memory… Location – internal or external Capacity – expressed in terms of bytes Unit of Transfer – the number of bits read out of or written into memory at a time Access Method – sequential, direct, random or associative From a users perspective the two most important characteristics of memory are… Capacity Performance – access time, memory cycle time, transfer rate The trade off for memory happens along three axis… Faster access time, greater cost per bit Greater capacity, smaller cost per bit Greater capacity, slower access time This leads to people using a tiered approach in their use of memory As one goes down the hierarchy, the following occurs… Decreasing cost per bit Increasing capacity Increasing access time Decreasing frequency of access of the memory by the processor The use of two levels of memory to reduce average access time works in principle, but only if conditions 1 to 4 apply. A variety of technologies exist that allow us to accomplish this. Thus it is possible to organize data across the hierarchy such that the percentage of accesses to each successively lower level is substantially less than that of the level above. A portion of main memory can be used as a buffer to hold data temporarily that is to be read out to disk. This is sometimes referred to as a disk cache and improves performance in two ways… Disk writes are clustered. Instead of many small transfers of data, we have a few large transfers of data. This improves disk performance and minimizes processor involvement. Some data designed for write-out may be referenced by a program before the next dump to disk. In that case the data is retrieved rapidly from the software cache rather than slowly from disk. Cache Memory Principles Cache memory is substantially faster than main memory. A caching system works as follows.. When a processor attempts to read a word of memory, a check is made to see if this in in cache memory… If it is, the data is supplied, If it is not in the cache, a block of main memory, consisting of a fixed number of words is loaded to the cache. Because of the phenomenon of locality of references, when a block of data is fetched into the cache, it is likely that there will be future references to that same memory location or to other words in the block. Elements of Cache Design While there are a large number of cache implementations, there are a few basic design elements that serve to classify and differentiate cache architectures… Cache Addresses Cache Size Mapping Function Replacement Algorithm Write Policy Line Size Number of Caches Cache Addresses Almost all non-embedded processors support virtual memory. Virtual memory in essence allows a program to address memory from a logical point of view without needing to worry about the amount of physical memory available. When virtual addresses are used the designer may choose to place the cache between the MMU (memory management unit) and the processor or between the MMU and main memory. The disadvantage of virtual memory is that most virtual memory systems supply each application with the same virtual memory address space (each application sees virtual memory starting at memory address 0), which means the cache memory must be completely flushed with each application context switch or extra bits must be added to each line of the cache to identify which virtual address space the address refers to. Cache Size We would like the size of the cache to be small enough so that the overall average cost per bit is close to that of main memory alone and large enough so that the overall average access time is close to that of the cache alone. Also, larger caches are slightly slower than smaller ones. Mapping Function Because there are fewer cache lines than main memory blocks, an algorithm is needed for mapping main memory blocks into cache lines. The choice of mapping function dictates how the cache is organized. Three techniques can be used… Direct – simplest technique, maps each block of main memory into only one possible cache line Associative – Each main memory block to be loaded into any line of the cache Set Associative – exhibits the strengths of both the direct and associative approaches while reducing their disadvantages For detailed explanations of each approach – read the text book (page 148 – 154) Replacement Algorithm For associative and set associating mapping a replacement algorithm is needed to determine which of the existing blocks in the cache must be replaced by a new block. There are four common approaches… LRU (Least recently used) FIFO (First in first out) LFU (Least frequently used) Random selection Write Policy When a block resident in the cache is to be replaced, there are two cases to consider If no writes to that block have happened in the cache – discard it If a write has occurred, a process needs to be initiated where the changes in the cache are propagated back to the main memory. There are several approaches to achieve this including… Write Through – all writes to the cache are done to the main memory as well at the point of the change Write Back – when a block is replaced, all dirty bits are written back to main memory The problem is complicated when we have multiple caches, there are techniques to accommodate for this but I have not summarized them. Line Size When a block of data is retrieved and placed in the cache, not only the desired word but also some number of adjacent words are retrieved. As the block size increases from very small to larger sizes, the hit ratio will at first increase because of the principle of locality, which states that the data in the vicinity of a referenced word are likely to be referenced in the near future. As the block size increases, more useful data are brought into cache. The hit ratio will begin to decrease as the block becomes even bigger and the probability of using the newly fetched information becomes less than the probability of using the newly fetched information that has to be replaced. Two specific effects come into play… Larger blocks reduce the number of blocks that fit into a cache. Because each block fetch overwrites older cache contents, a small number of blocks results in data being overwritten shortly after they are fetched. As a block becomes larger, each additional word is farther from the requested word and therefore less likely to be needed in the near future. The relationship between block size and hit ratio is complex, and no set approach is judged to be the best in all circumstances. Pentium 4 and ARM cache organizations The processor core consists of four major components: Fetch/decode unit – fetches program instruction in order from the L2 cache, decodes these into a series of micro-operations, and stores the results in the L2 instruction cache Out-of-order execution logic – Schedules execution of the micro-operations subject to data dependencies and resource availability – thus micro-operations may be scheduled for execution in a different order than they were fetched from the instruction stream. As time permits, this unit schedules speculative execution of micro-operations that may be required in the future Execution units – These units execute micro-operations, fetching the required data from the L1 data cache and temporarily storing results in registers Memory subsystem – This unit includes the L2 and L3 caches and the system bus, which is used to access main memory when the L1 and L2 caches have a cache miss and to access the system I/O resources

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Analysing Indexes - reducing scans.

- by GrumpyOldDBA

The whole subject of database/application tuning is sometimes akin to a black art, it's pretty easy to find your worst 20 whatever but actually seeking to reduce operational overhead can be slightly more tricky. If you ever read through my analysing indexes post you'll know I have a number of ways of seeking out ways to tune the database. -- This is a slightly different slant on one of those which produced an interesting side effect. -- We all know that except for very small tables avoiding...(read more)

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Using Sizer for recording presentations

- by John Paul Cook

I needed to do some screen captures and recordings of SSMS and realized this is a common problem that many of you could use some help with. There is a freeware tool called Sizer (thanks to Paul Nielsen for telling me about it) that lets you chose your window size. I downloaded the zip file instead of the msi because I didn’t want to install anything. The extracted executable works perfectly as a portable application. After double-clicking the Sizer executable, an icon resembling a plus sign appears...(read more)

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Video playback in games - formats & decoding

- by snake5

What free / non-restrictive open-source solutions (not GPL) are available for decoding game videos? The requirements are simple: a relatively easy to use C API encoded files must be quite small there must be an application that converts videos from any format (whatever codec is installed on Windows or equivalent amount of internally decoded formats) decoding has to happen fairly quickly bonus points go to file formats that are popular / actively supported and developed

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I'm a contract developer and I think I'm about to get screwed [closed]

- by kagaku

I do contract development on the side. You could say that I'm a contract developer? Considering I've only ever had one client I'd say that's not exactly the truth - more like I took a side job and needed some extra cash. It started out as a "rebuild our website and we'll pay you $10k" type project. Once that was complete (a bit over schedule, but certainly not over budget), the company hired me on as a "long term support" contractor. The contract is to go from March of this year, expiring on December 31st of this year - 10 months. Over which a payment is to be paid on the 30th of each month for a set amount. I've been fulfilling my end of the contract on all points - doing server maintenence, application and database changes, doing huge rush changes and pretty much just going above and beyond. Currently I'm in the middle of development of an iPhone mobile application (PhoneGap based) which is nearing completion (probably 3-4 weeks from submission). It has not been all peaches and flowers though. Each and every month when my paycheck comes due, there always seems to be an issue of sorts. These issues did not occur during the initial project, only during the support contract. The actual contract states that my check should be mailed out on the 30th of the month. I have received my check on time approximately once (on time being about 2-3 days within the 30th). I've received my paycheck as late as the 15th of the next month - over two weeks late. I've put up with it because I need the paycheck. There have been promises and promises of "we'll send it out on time next time! I promise" - only to receive it just as late the next month. When I ask about payment they give me a vibe like "why are you only worried about money?" - unfortunately I don't have the luxury of not worrying about money. The last straw was with my August payment, which should have been mailed on August 30th. I received it on September 12th. The reason for the delay? "USPS is delaying it man! we sent it out on the 1st!" is the reason I got. When I finally got the check in the mail, the postage on the envelope was marked September 10th - the date it was run through the postage machine. I've been outright lied to, at this point. I carry on working, because again - I need a paycheck. I orchestrated the move of our application to a new server, developed a bunch of new changes and continued work on the iPhone app. All told I probably went over my hourly allotment (I'm paid for 40 hours a month, I probably put in at least 50). On Saturday, the 1st, I gave the main contact at the company (a company of 3, by the way - this is not some big corporation) a ring and filled him in on the status of my work for the past two weeks. Unusually I hadn't heard from him since the middle of September. His response was "oh... well, that is nice and uh.. good job. well, we've been talking within the company about things and we've certainly got some decisions ahead of us..." - not verbatim but you get the idea (I hope?). I got out of this conversation that the site is not doing very well (which it's not) and they're considering pulling the plug. Crap, this contract is going to end early - there goes Christmas! Fine, that's alright, no problem. I'll get paid for the last months work and call it a day. Unfortunately I still haven't gotten last months check, and I'm getting dicked around now. "Oh.. we had problems transferring funds, we'll try and mail it out tomorrow" and "I left a VM with the finance guy, but I can't get ahold of him". So I'm getting the feeling I'm not getting paid for all the work I put in for September. This is obviously breach of contract, and I am pissed. Thinking irrationally, I considered changing all their passwords and holding their stuff hostage. Before I think it through (by the way, I am NOT going to do this, realized it would probably get me in trouble), I go and try some passwords for our various accounts. Google Apps? Oh, I'm no longer administrator here. Godaddy? Whoops, invalid password. Disqus? Nope, invalid password here too. Google Adsense / Analytics? Invalid password. Dedicated server account manager? Invalid password. Now, I have the servers root password - I just built the box last week and haven't had a chance to send the guy the root password. Wasn't in a rush, I manage the server and they never touch it. Now all of a sudden all the passwords except this one are changed; the writing is on the wall - I am out. Here's the conundrum. I have the root password, they do not. If I give them this password all the leverage I have is gone, out the door and out of my hands. During this argument of why am I not getting paid the guy sends me an email saying "oh by the way, what's the root username and password to the server?". Considering he knows absolutely nothing, I gave him an "admin" account which really has almost no rights. I still have exclusive access to the server, I just don't know where to go. I can hold their data hostage, but I'm almost positive this is the wrong thing to do. I'd consider it blackmail, regardless of whether or not I have gotten paid yet. I can "break" something on the server and give them the whole "well, if you were paying me I could fix it!" spiel. This works from a "well he's not holding their stuff hostage" point of view, but what stops them from hiring some one else to just fix the issue at hand? For all I know the guys nephew is a "l33t hax0r" and can figure it out for free. I can give in, document as much as I can and take him to small claims court. This is breach of contract, I'm not getting paid. I have a case, right? ???? Does anyone have any experience in this? What can I do? What are my options? I'm broke, I can't afford a lawyer and I can barely afford not getting this paycheck. My wife doesn't work (I work two jobs so she doesn't have to work - we have a 1 year old) and is already looking at getting a part time job to cover the bills. Long term we'll be fine, but this has pissed me off beyond belief! Help me out, I'm about to get screwed.

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Can DrawIndexedPrimitives() be used for drawing a loaded model mesh-wise?

- by Afzal

I am using DrawIndexedPrimitives() for drawing a loaded 3D model by drawing each mesh part, but this process makes my application very slow. This is perhaps because of a very large number of vertex/index buffer data created in video memory. That is why I am looking for a way to use the same method for each model mesh instead. The problem is that I don't know how I will set the textures of that mesh. Can anyone offer me some guidance?

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ExaLogic X3-2 launched at OOW 2012

- by JuergenKress

New Configurations Deliver Extreme Performance and Higher Deployment Density for Application Workloads of All Sizes and Complexities: As an Oracle partner you can learn more about ExaLogic in the WebLogic Partner Community – membership is free! WebLogic Partner Community For regular information become a member in the WebLogic Partner Community please visit: http://www.oracle.com/partners/goto/wls-emea ( OPN account required). If you need support with your account please contact the Oracle Partner Business Center. Blog Twitter LinkedIn Mix Forum Wiki Technorati Tags: ExaLogic,ExaLogic X3-2,Oracle Open World,OOW,WebLogic,WebLogic Community,Oracle,OPN,Jürgen Kress

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Webcast - June 27th: Announcing Oracle SuperCluster T5-8: Our Fastest Engineered System

- by Javier Puerta

Join us for a live webcast with Oracle Executive Vice President, John Fowler, as he announces the new Oracle SuperCluster T5-8: Our Fastest Engineered System. Learn how the new Oracle SuperCluster T5-8 delivers: Extreme performance through Oracle Exadata, Oracle Exalogic, Oracle’s virtualization solutions, and the world’s fastest servers Highest availability with no single point of failure and 99.999% uptime Highest efficiency with unmatched price/performance and the lowest operating costs A complete engineered system ideal for database and application consolidation and private cloud Register here

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How portable are Binaries compiled in Ubuntu?

- by hiobs

The title says it all, actually. But allow me to specify the question: Assuming I were to compile an application that uses libffi, libGL, dlfcn, and SDL, would said binary run on other Linux distributions with same architecture, etc? The reason I ask is because of the directory /usr/lib/i386-linux-gnu - I might be wrong, but I assume this directory is something rather Ubuntu-specific, no? So, how portable are binaries compiled on Ubuntu really?

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Grails disponible en version 1.3 : téléchargez la dernière version du framework de développement Web

Bonjour, SpringSource vient d'annoncer la disponibilité de Grails en version 1.3 avec un support du langage Groovy dans sa version 1.7. Parmi les changements notables :JUnit 4 support Maven repository support for Grails plugins Declarative plugin dependencies Dirty checking in GORM Chaining of named criteria Application wide Sitemesh layouts Quelle est la nouvelle fonctionnalité que vous trouvez la plus intéressante ? Source

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