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how to loop through menu and remove class and then add class to current menu item

- by Jonathan Lyon

Hi all I have this menu structure that is used to navigate through content slider panels. <div id="menu"> <ul> <li><a href="#1" class="cross-link highlight">Bliss Fine Foods</a></li> <li><a href="#2" class="cross-link">Menus</a></li> <li><a href="#3" class="cross-link">Wines</a></li> <li><a href="#4" class="cross-link">News</a></li> <li><a href="#5" class="cross-link">Contact Us</a></li> </ul> </div> I would like to loop through these elements and remove the highlight class and then add the highlight class to the current / last clicked menu item. Any ideas? Any help would be greatly appreciated. Thanks Jonathan

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problems with scrolling a java TextArea

- by Jonathan

All, I am running into an issue using JTextArea and JScrollPane. For some reason the scroll pane appears to not recognize the last line in the document, and will only scroll down to the line before it. The scroll bar does not even change to a state where I can slide it until the lines in the document are two greater than the number of lines the textArea shows (it should happen as soon as it is one greater). Has anyone run into this before? What would be a good solution (I want to avoid having to add an extra 'blank' line to the end of the document, which I would have to remove every time I add a new line)? Here is how I instantiate the TextArea and ScrollPane: JFrame frame = new JFrame("Java Chat Program"); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); Container pane = frame.getContentPane(); if (!(pane.getLayout() instanceof BorderLayout)) { System.err.println("Error: UI Container does not implement BorderLayout."); System.exit(-1); } textArea = new JTextArea(); textArea.setPreferredSize(new Dimension(500, 100)); textArea.setEditable(false); textArea.setLineWrap(true); textArea.setWrapStyleWord(true); JScrollPane scroller = new JScrollPane(textArea); scroller.setVerticalScrollBarPolicy(ScrollPaneConstants.VERTICAL_SCROLLBAR_ALWAYS); pane.add(scroller, BorderLayout.CENTER); Here is the method I use to add a new line to textArea: public void println(String a) { textArea.append(" "+a+"\n"); textArea.setCaretPosition(textArea.getDocument().getLength()); } Thanks for your help, Jonathan EDIT: Also, as a side note, with the current code I have to manually scroll down. I assumed that setCaretPosition(doc.getLength()) in the println(line) method would automatically set the page to the bottom after a line is entered... Should that be the case, or do I need to do something differently?

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Shared value in parallel python

- by Jonathan

Hey all- I'm using ParallelPython to develop a performance-critical script. I'd like to share one value between the 8 processes running on the system. Please excuse the trivial example but this illustrates my question. def findMin(listOfElements): for el in listOfElements: if el < min: min = el import pp min = 0 myList = range(100000) job_server = pp.Server() f1 = job_server.submit(findMin, myList[0:25000]) f2 = job_server.submit(findMin, myList[25000:50000]) f3 = job_server.submit(findMin, myList[50000:75000]) f4 = job_server.submit(findMin, myList[75000:100000]) The pp docs don't seem to describe a way to share data across processes. Is it possible? If so, is there a standard locking mechanism (like in the threading module) to confirm that only one update is done at a time? l = Lock() if(el < min): l.acquire if(el < min): min = el l.release I understand I could keep a local min and compare the 4 in the main thread once returned, but by sharing the value I can do some better pruning of my BFS binary tree and potentially save a lot of loop iterations. Thanks- Jonathan

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How does Java handle ArrayList refrerences and assignments?

- by Jonathan

Hey all- I mostly write in C but am using Java for this project. I want to know what Java is doing here under the hood. ArrayList<Integer> prevRow, currRow; currRow = new ArrayList<Integer>(); for(i =0; i < numRows; i++){ prevRow = currRow; currRow.clear(); currRow.addAll(aBunchOfItems); } Is the prevRow = currRow line copying the list or does prevRow now point to the same list as currRow? If prevRow points to the same list as currRow, I should create a new ArrayList instead of clearing.... private ArrayList<Integer> someFunction(ArrayList<Integer> l){ Collections.sort(l); return l; } main(){ ArrayList<Integer> list = new ArrayList<Integer>(Integer(3), Integer(2), Integer(1)); list = someFunction(list); //Option 1 someFunction(list); //Option 2 } In a similar question, do Option 1 and Option 2 do the same thing in the above code? Thanks- Jonathan

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what is the jquery selector syntax to select this LI item

- by Jonathan Lyon

hi all I need to select each list item and change the background image of the parent div homepagecontainer but I can't even select the li element in my script. Here is the code: <div class="transparent" id="programmesbox"> <ul id="frontpage"> <?php query_posts('showposts=20&post_parent=7&post_type=page'); if (have_posts()) : while (have_posts()) : the_post(); ?> <li id="<?php the_id() ?>" ><a class="sprite" href="<?php the_permalink() ?>" title="<?php the_title(); ?>"><?php the_title(); ?></a></li> <?php endwhile; endif; ?> </ul> </div> I need to do something like this <script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.4.2/jquery.min.js"></script> <script type="text/javascript"> $('#frontpage li a').hover(function() { alert('here'); //CHANGE BACKGROUND IMAGE OF 'homepage_container' to different image depending on which list item is hovered over } ); </script> This is the URL of the site:- http://www.thebalancedbody.ca/ Thanks so much!! Jonathan

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Rolling Back a Transaction with MySQL Connector in VB.net

- by Jonathan

Hey all- I have one multi-row INSERT statement (300 or so sets of values) that I would like to commit to the MySQL database in an all-or-nothing fashion. insert into table VALUES (1, 2, 3), (4, 5, 6), (7, 8, 9); In some cases, a set of values in the command will not meet the criteria of the table (duplicate key, for example). When that happens I do not want any of the previous sets added to the database. I've implemented this with the following code, however, my rollback command doesn't appear to be making a difference. I've used this documentation: http://dev.mysql.com/doc/refman/5.0/es/connector-net-examples-mysqltransaction.html Dim transaction As MySqlTransaction = sqlConnection.BeginTransaction() sqlCommand = New MySqlCommand(insertStr, sqlConnection, transaction) Try sqlCommand.ExecuteNonQuery() Catch ex As Exception writeToLog("EXCEPTION: " & ex.Message & vbNewLine) writeToLog("Could not execute " & sqlCmd & vbNewLine) Try transaction.Rollback() writeToLog("All statements were rolled back." & vbNewLine) Return False Catch rollbackEx As Exception writeToLog("EXCEPTION: " & rollbackEx.Message & vbNewLine) writeToLog("All statements were not rolled back." & vbNewLine) Return False End Try End Try transaction.commit() I get the DUPLICATE KEY exception thrown, no Rollback Exception thrown, and every set of values up to duplicate key committed to the database. What am I doing wrong? Thanks- Jonathan

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Position Div using Javascript on page refresh

- by Jonathan Lyon

Hi all I have a div that I would like to reposition each time the page is refreshed. It is currently set in the css using top and left. I wold like to pass the top and left values on page refresh. #inneriframe { position:absolute; top:-170px; left:-5px; width:1280px; height:1200px; } The content is from another site and contained in an iframe and I want the viewport of the div to change(within certain limits) each time the page is refreshed. The original page is here http://labs.ideeinc.com/multicolr#colors=8438AD; I have iFramed part of it here http://www.weninja.com/what-we-do Full code <style type="text/css"> #outerdiv { width:280px; height:150px; overflow:hidden; position:relative; } #inneriframe { position:absolute; top:-170px; left:-5px; width:1280px; height:1200px; } </style> <div id='outerdiv'> <iframe src="http://labs.ideeinc.com/multicolr#colors=8438AD;" id='inneriframe' scrolling=no></iframe> </div> <h5>Multicolr Search Lab © 2008 Idee Inc</h5> So basically I just need to change the TOP and LEFT values for the div #inneriframe to have different images show - is this possible? Thanks Jonathan

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How does a client find the port number of a server?

- by Jonathan

Hello all, I am currently learning about basic networking in java. I have been playing around with the server and client relationship between two of my computers. However, I cannot figure out how distributed programs (say, a videogame), can not only find the 'host' computer, but also the port number on which the server is running in order to create a Socket between the two computers. The only way I really see to create a Socket is with an already known IP Address, and with a known port number. How do you search a LAN network for another computer (host) searching for clients? How do you determine what port the server is located on without 'pinging' all available ports for a response (which, I understand, is bad form... Something about 'server attack'...)? In such a situation as a video game, there can be any number of computers on the same network, and any number of them might be attempting to host, or otherwise running the application. Any other important information, or perhaps reference to a more detailed tutorial than the one I am using, regarding making connections on so very little information on the client side would be appreciated. Many thanks, Jonathan

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YQL + PHP : how to make a facebook login

- by Jonathan

Hi! I was reading some stuff about the YQL api that Yahoo! has provided, I am not sure, but it appears to be a collection of lots of third party api into one common language, right? what I don't get is how to make the facebook login through it so I can get the user profile data... My project is to add a facebook(and other social networks) form login, because the website won't have his own login, people will have to use a social network to link in. Then I thought the YQL would help me out with this task so I wouldn't have to develop lots of functions to each one of the networks. Reading this http://developer.yahoo.com/yql/guide/yql-code-examples.html#sdk_yql, I understood how to make a Yahoo login so I can access some private data, but couldn't find how I could do it with facebook and others So my question... Can YQL help me with this? Can you give me a simple example of a facebook session using it within PHP? Are there alternatives to aid me in this task? thanks, Jonathan

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Parsing SQLIO Output to Excel Charts using Regex in PowerShell

- by Jonathan Kehayias

Today Joe Webb ( Blog | Twitter ) blogged about The Power of Regex in Powershell, and in his post he shows how to parse the SQL Server Error Log for events of interest. At the end of his blog post Joe asked about other places where Regular Expressions have been useful in PowerShell so I thought I’d blog my script for parsing SQLIO output using Regex in PowerShell, to populate an Excel worksheet and build charts based on the results automatically. If you’ve never used SQLIO, Brent Ozar ( Blog...(read more)

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Parsing SQLIO Output to Excel Charts using Regex in PowerShell

- by Jonathan Kehayias

Today Joe Webb ( Blog | Twitter ) blogged about The Power of Regex in Powershell, and in his post he shows how to parse the SQL Server Error Log for events of interest. At the end of his blog post Joe asked about other places where Regular Expressions have been useful in PowerShell so I thought I’d blog my script for parsing SQLIO output using Regex in PowerShell, to populate an Excel worksheet and build charts based on the results automatically. If you’ve never used SQLIO, Brent Ozar ( Blog | Twitter...(read more)

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Why the “Toilet” Analogy for SQL might be bad

- by Jonathan Kehayias

Robert Davis(blog/twitter) recently blogged The Toilet Analogy … or Why I Never Recommend Increasing Worker Threads , in which he uses an analogy for why increasing the value for the ‘max worker threads’ sp_configure option can be bad inside of SQL Server. While I can’t make an argument against Robert’s assertion that increasing worker threads may not improve performance, I can make an argument against his suggestion that, simply increasing the number of logical processors, for example from...(read more)

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Bob Dorr’s SQL I/O Presentation on PSS Blog

- by Jonathan Kehayias

In case you missed it, Bob Dorr from the PSS Team posted an amazing blog post today yesterday with all of the slides and speaker notes from his SQL Server I/O presentation. This is a must read for and Database Professional using SQL Server. http://blogs.msdn.com/psssql/archive/2010/03/24/how-it-works-bob-dorr-s-sql-server-i-o-presentation.aspx Share this post: email it! | bookmark it! | digg it! | reddit! | kick it! | live it!...(read more)

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Bob Dorr’s SQL I/O Presentation on PSS Blog

- by Jonathan Kehayias

In case you missed it, Bob Dorr from the PSS Team posted an amazing blog post today yesterday with all of the slides and speaker notes from his SQL Server I/O presentation. This is a must read for and Database Professional using SQL Server. http://blogs.msdn.com/psssql/archive/2010/03/24/how-it-works-bob-dorr-s-sql-server-i-o-presentation.aspx Share this post: email it! | bookmark it! | digg it! | reddit! | kick it! | live it!...(read more)

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Why I don’t need to go on the SQLCruise

- by Jonathan Kehayias

Brent Ozar ( Blog | Twitter ) and Tim Ford ( Blog | Twitter ) are putting on a new type of event in the month of August after SQL Saturday #40 in South Florida July, 31st , properly named SQLCruise . The concept is great, at least in my opinion, you pay for a cruise, get to have a break, and at the same time attend a mini-conference on SQL Server with training provided by two great speakers. The cost is relatively affordable, so what could possibly make it better? How about a sponsor offering up...(read more)

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Why I don’t need to go on the SQLCruise

- by Jonathan Kehayias

Brent Ozar ( Blog | Twitter ) and Tim Mitchell ( Blog | Twitter ) are putting on a new type of event in the month of August after SQL Saturday #40 in South Florida July, 31st , properly named SQLCruise . The concept is great, at least in my opinion, you pay for a cruise, get to have a break, and at the same time attend a mini-conference on SQL Server with training provided by two great speakers. The cost is relatively affordable, so what could possibly make it better? How about...(read more)

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An XEvent a Day (10 of 31) – Targets Week – etw_classic_sync_target

- by Jonathan Kehayias

Yesterday’s post, Targets Week – pair_matching , looked at the pair_matching Target in Extended Events and how it could be used to find unmatched Events. Today’s post will cover the etw_classic_sync_target Target, which can be used to track Events starting in SQL Server, out to the Windows Server OS Kernel, and then back to the Event completion in SQL Server. What is the etw_classic_sync_target Target? The etw_classic_sync_target Target is the target that hooks Extended Events in SQL Server...(read more)

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An XEvent a Day (11 of 31) – Targets Week – Using Multiple Targets to Debug Orphaned Transactions

- by Jonathan Kehayias

Yesterday’s blog post Targets Week – etw_classic_sync_target covered the ETW integration that is built into Extended Events and how the etw_classic_sync_target can be used in conjunction with other ETW traces to provide troubleshooting at a level previously not possible with SQL Server. In today’s post we’ll look at how to use multiple targets to simplify analysis of Event collection. Why Multiple Targets? You might ask why you would want to use multiple Targets in an Event Session with Extended...(read more)

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Some thoughts on interviewing….

- by Jonathan Kehayias

At the beginning of the year I changed jobs, leaving a very stable position where I had the opportunity to learn under an amazing mentor (who happened to be a Oracle DBA and not a SQL DBA), to take on a job that I felt was much more challenging and had better potential for personal as well as professional growth. I wasn’t necessarily looking for another job at the time, but one that interested me was mentioned at our local user group meeting and I decided to check it out and see if it was something...(read more)

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An XEvent a Day (19 of 31) – Using Customizable Fields

- by Jonathan Kehayias

Today’s post will be somewhat short, but we’ll look at Customizable Fields on Events in Extended Events and how they are used to collect additional information. Customizable Fields generally represent information of potential interest that may be expensive to collect, and is therefore made available for collection if specified by the Event Session. In SQL Server 2008 and 2008 R2, there are 50 Events that have customizable columns in their payload. In SQL Server Denali CTP1, there...(read more)

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Another Questionable Article Online…

- by Jonathan Kehayias

At the beginning of the month I blogged about my thoughts on the virtualization feedback provided by SSWUG’s newsletter , and Rich responded with some information on how the incorrect information lead him to making incorrect conclusions. It seems like every couple of weeks an article, tip, newsletter, whatever is posted by or on a major site that has questionable if not outright incorrect material in it. Last week MSSQLTips posted SQL Server tempdb one or multiple data files in which...(read more)

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An XEvent a Day (18 of 31) – A Look at Backup Internals and How to Track Backup and Restore Throughput (Part 2)

- by Jonathan Kehayias

In yesterday’s blog post A Look at Backup Internals and How to Track Backup and Restore Throughput (Part 1) , we looked at what happens when we Backup a database in SQL Server. Today, we are going to use the information we captured to perform some analysis of the Backup information in an attempt to find ways to decrease the time it takes to backup a database. When I began reviewing the data from the Backup in yesterdays post, I realized that I had made a mistake in the process and left...(read more)

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Some thoughts on interviewing….

- by Jonathan Kehayias

At the beginning of the year I changed jobs, leaving a very stable position where I had the opportunity to learn under an amazing mentor (who happened to be a Oracle DBA and not a SQL DBA), to take on a job that I felt was much more challenging and had better potential for personal as well as professional growth. I wasn’t necessarily looking for another job at the time, but one that interested me was mentioned at our local user group meeting and I decided to check it out and see if it was something...(read more)

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An XEvent a Day (3 of 31) – Managing Event Sessions

- by Jonathan Kehayias

Yesterdays post, Querying the Extended Events Metadata , showed how to discover the objects available for use in Extended Events. In todays post, we’ll take a look at the DDL Commands that are used to create and manage Event Sessions based on the objects available in the system. Like other objects inside of SQL Server, there are three DDL commands that are used with Extended Events; CREATE EVENT SESSION , ALTER EVENT SESSION , and DROP EVENT SESSION . The command names are self...(read more)

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An XEvent a Day (13 of 31) – The system_health Session

- by Jonathan Kehayias

Today’s post was originally planned for this coming weekend, but seems I’ve caught whatever bug my kids had over the weekend so I am changing up today’s blog post with one that is easier to cover and shorter. If you’ve been running some of the queries from the posts in this series, you have no doubt come across an Event Session running on your server with the name of system_health. In today’s post I’ll go over this session and provide links to references related to it. When Extended Events...(read more)

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