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  • How do I figure out what is changing the userWorkstations attribute in Active Directory?

    - by Martin
    I just took over the IT for a medium sized business with a three domain controllers (2003/2008 Standard) and whenever I create a new user, after some time the user account cannot log into most machines on the network. I have traced this back to the "Log On To..." area becoming populated with a small list of machines. Even when I set the option to all computers, this list comes back after some time. I started hunting for vbs and ps1 scripts with the word "workstations" in them on all domain controllers to see if there is some kind of script to blame, but I have thus far come up empty handed. Is there a known software suite that can cause this (Microsoft Forefront, etc)? How can I figure out what is causing this list to change?

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  • How can the DataView object reference not be set?

    - by dboarman-FissureStudios
    I have the following sample where the SourceData class would represent a DataView resulting from an Sql query: class MainClass { private static SourceData Source; private static DataView View; private static DataView Destination; public static void Main (string[] args) { Source = new SourceData(); View = new DataView(Source.Table); Destination = new DataView(); Source.AddRowData("Table1", 100); Source.AddRowData("Table2", 1500); Source.AddRowData("Table3", 1300324); Source.AddRowData("Table4", 1122494); Source.AddRowData("Table5", 132545); Console.WriteLine(String.Format("Data View Records: {0}", View.Count)); foreach(DataRowView drvRow in View) { Console.WriteLine(String.Format("Source {0} has {1} records.", drvRow["table"], drvRow["records"])); DataRowView newRow = Destination.AddNew(); newRow["table"] = drvRow["table"]; newRow["records"] = drvRow["records"]; } Console.WriteLine(); Console.WriteLine(String.Format("Destination View Records: {0}", Destination.Count)); foreach(DataRowView drvRow in Destination) { Console.WriteLine(String.Format("Destination {0} has {1} records.", drvRow["table"], drvRow["records"])); } } } class SourceData { public DataTable Table { get{return dataTable;} } private DataTable dataTable; public SourceData() { dataTable = new DataTable("TestTable"); dataTable.Columns.Add("table", typeof(string)); dataTable.Columns.Add("records", typeof(int)); } public void AddRowData(string tableName, int tableRows) { dataTable.Rows.Add(tableName, tableRows); } } My output is: Data View Records: 5 Source Table1 has 100 records. Unhandled Exception: System.NullReferenceException: Object reference not set to an instance of an object at System.Data.DataView.AddNew () [0x0003e] in /usr/src/packages/BUILD/mono-2.4.2.3 /mcs/class/System.Data/System.Data/DataView.cs:344 at DataViewTest.MainClass.Main (System.String[] args) [0x000e8] in /home/david/Projects/DataViewTest/SourceData.cs:29 I did some reading here: DataView:AddNew Method... ...and it would appear that I am doing this the right way. How come I am getting the Object reference not set?

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  • Linux Device Driver: Symbol "memcpy" not found

    - by Hinton
    Hello, I'm trying to write a Linux device driver. I've got it to work really well, until I tried to use "memcpy". I don't even get a compiler error, when I "make" it just warns me: WARNING: "memcpy" [/root/homedir/sv/main.ko] undefined! OK and when I try to load via insmod, I get on the console: insmod: error inserting './main.ko': -1 Unknown symbol in module and on dmesg: main: Unknown symbol memcpy (err 0) I include the following: #include <linux/module.h> #include <linux/moduleparam.h> #include <linux/init.h> #include <linux/kernel.h> /* printk() */ #include <linux/slab.h> /* kmalloc() */ #include <linux/fs.h> /* everything... */ #include <linux/errno.h> /* error codes */ #include <linux/types.h> /* size_t */ #include <linux/fcntl.h> /* O_ACCMODE */ #include <linux/cdev.h> #include <asm/system.h> /* cli(), *_flags */ #include <asm/uaccess.h> /* copy_*_user */ The function using memcpy: static int dc_copy_to_user(char __user *buf, size_t count, loff_t *f_pos, struct sv_data_dev *dev) { char data[MAX_KEYLEN]; size_t i = 0; /* Copy the bulk as long as there are 10 more bytes to copy */ while (i < (count + MAX_KEYLEN)) { memcpy(data, &dev->data[*f_pos + i], MAX_KEYLEN); ec_block(dev->key, data, MAX_KEYLEN); if (copy_to_user(&buf[i], data, MAX_KEYLEN)) { return -EFAULT; } i += MAX_KEYLEN; } return 0; } Could someone help me? I thought the thing was in linux/string.h, but I get the error just the same. I'm using kernel 2.6.37-rc1 (I'm doing in in user-mode-linux, which works only since 2.6.37-rc1). Any help is greatly appreciated. # Context dependent makefile that can be called directly and will invoke itself # through the kernel module building system. KERNELDIR=/usr/src/linux ifneq ($(KERNELRELEASE),) EXTRA_CFLAGS+=-I $(PWD) -ARCH=um obj-m := main.o else KERNELDIR ?= /lib/modules/$(shell uname -r)/build PWD = $(shell pwd) all: $(MAKE) V=1 ARCH=um -C $(KERNELDIR) M=$(PWD) modules clean: rm -rf Module.symvers .*.cmd *.ko .*.o *.o *.mod.c .tmp_versions *.order endif

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  • Ho to convert classname as string to a class ?

    - by Roland Bengtsson
    I have classnames in a stringlist. For example it could be 'TPlanEvent', 'TParcel', 'TCountry' etc. Now I want to find out the sizes by looping the list. It works to have: Size := TCountry.InstanceSize; But I want it like this: for i := 0 to ClassList.Count - 1 do Size := StringToClass(ClassList[i]).InstanceSize; Obviously my question is what to write instead of method StringToClass to convert the string to a class.

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  • How to rewrite this SQL statement to LINQ 2 SQL ?

    - by Shyju
    How can i convert this SQL query to its equivalent LINQ 2 SQL statement for VB.NET? SELECT COUNT(*) AS 'Qty', IV200.itemnmbr, IV200.locncode, IV200.bin, CAST(IV112.Quantity as int) as 'Qty2' , 'parentBIN' = isnull(MDS.parentBIN,iv112.bin) From IV00200 IV200 (nolock) inner join IV00112 IV112 (nolock) on iv200.itemnmbr = iv112.itemnmbr and IV200.bin = IV112.bin and iv200.locncode = iv112.locncode left outer join mds_container mds (nolock) on isnull(mds.locncode,'nul') = isnull(iv112.locncode,'nul') and isnull(mds.containerbin,'nul') = isnull(iv112.bin,'nul') where IV200.bin = 'MU7I336A80' group by IV200.itemnmbr, IV200.locncode, IV200.bin, IV112.Quantity, isnull(MDS.parentBIN,iv112.bin) order by IV200.itemnmbr

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  • Select distinct from multiple fields using sql

    - by Bryan
    I have 5 columns corresponding to answers in a trivia game database - right, wrong1, wrong2, wrong3, wrong4 I want to return all possible answers without duplicates. I was hoping to accomplish this without using a temp table. Is it possible to use something similar to this?: select c1, c2, count(*) from t group by c1, c2 But this returns 3 columns. I would like one column of distinct answers. Thanks for your time

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  • Does upgrading RAM causes increase in Graphic card's share?

    - by A.S.
    I have asked this question on Ask Ubuntu, and I was suggested to Upgrade RAM from most voted answers. But I got a point about my graphics card. Since, I can upgrade RAM and not graphics card, Does upgrading RAM also cause graphics memory to increase. To clear the point: My specs are given below: Laptop : Lenovo 3000 Y410. (bought in 2008 October) RAM: 1 GB (DDR2) External Graphics (Dedicated): N/A Internal Graphics (Shared): 256 MB Graphics Chipset: Intel GMA X3100 My Question is: If I increase my RAM to 3 GB, will it increase graphics cards share of the Memory. In other word, If graphics card shares 256 MB in 1GB RAM, will it share more, when I upgrade the RAM into 2GB or more ? Authentic resource link will be much appreciated I have recently known that, My chipset GMA X3100 can address 384 MB of RAM. So the question.

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  • how to find difference between two timestamp using hibernate query language

    - by Shekhar
    Hello I am trying to write an hql query which gives me the number of hours between two timestamp. So, far i am unable to do this. I have used hql hour function but that does not work if the timestamp corresponds to different date. Please provide any input. My hql query is select count(*) from com.xxx.Request as request where request.id = :id and hour(current_timestamp - request.lastEventDate) :delay Thanks Shekhar

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  • XmlException - inserting attribute gives "unexpected token" exception

    - by Anders Svensson
    Hi, I have an XmlDocument object in C# that I transform, using XslTransform, to html. In the stylesheet I insert an id attribute in a span tag, taking the id from an element in the XmlDocument. Here is the template for the element: <xsl:template match="word"> <span> <xsl:attribute name="id"><xsl:value-of select="@id"></xsl:value-of></xsl:attribute> <xsl:apply-templates/> </span> </xsl:template> But then I want to process the result document as an xhtml document (using the XmlDocument dom). So I'm taking a selected element in the html, creating a range out of it, and try to load the element using XmlLoad(): wordElem.LoadXml(range.htmlText); But this gives me the following exception: "'598' is an unexpected token. The expected token is '"' or '''. Line 1, position 10." And if I move the cursor over the range.htmlText, I see the tags for the element, and the "id" shows without quotes, which confuses me (i.e.SPAN id=598 instead of SPAN id="598"). To confuse the matter further, if I insert a blank space or something like that in the value of the id in the stylesheet, it works fine, i.e.: <span> <xsl:attribute name="id"><xsl:text> </xsl:text> <xsl:value-of select="@id"></xsl:value-of></xsl:attribute> <xsl:apply-templates/> </span> (Notice the whitespace in the xsl:text element). Now if I move the cursor over the range.htmlText, I see an id with quotes as usual in attributes (and as it shows if I open the html file in notepad or something). What is going on here? Why can't I insert an attribute this way and have a result that is acceptable as xhtml for XmlDocument to read? I feel I am missing something fundamental, but all this surprises me, since I do this sort of transformations using xsl:attribute to insert attributes all the time for other types of xsl transformations. Why doesn't XmlDocument accept this value? By the way, it doesn't matter if it is an id attribute. i have tried with the "class" attribute, "style" etc, and also using literal values such as "style" and setting the value to "color:red" and so on. The compiler always complains it is an unvalid token, and does not include quotes for the value unless there is a whitespace or something else in there (linebreaks etc.). I hope I have provided enough information. Any help will be greatly appreciated. Basically, what I want to accomplish is set an id in a span element in html, select a word in a webbrowser control with this document loaded, and get the id attribute out of the selected element. I've accomplished everything, and can actually do what I want, but only if I use regex e.g. to get the attribute value, and I want to be able to use XmlDocument instead to simply get the value out of the attribute directly. I'm sure I'm missing something simple, but if so please tell me. Regards, Anders

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  • Yii - Custom GridView with Multiple Tables

    - by savinger
    So, I've extended GridView to include an Advanced Search feature tailored to the needs of my organization. Filter - lets you show/hide columns in the table, and you can also reorder columns by dragging the little drag icon to the left of each item. Sort - Allows for the selection of multiple columns, specify Ascending or Descending. Search - Select your column and insert search parameters. Operators tailored to data type of selected column. Version 1 works, albeit slowly. Basically, I had my hands in the inner workings of CGridView, where I snatch the results from the DataProvider and do the searching and sorting in PHP before rendering the table contents. Now writing Version 2, where I aim to focus on clever CDbCriteria creation, allowing MySQL to do the heavy lifting so it will run quicker. The implementation is trivial when dealing with a single database table. The difficulty arises when I'm dealing with 2 or more tables... For example, if the user intends to search on a field that is a STAT relation, I need that relation to be present in my query. Here's the question. How do I assure that Yii includes all with relations in my query so that I include comparisons? I've included all my relations with my criteria in the model's search function and I've tried CDbCriteria's together ... public function search() { $criteria=new CDbCriteria; $criteria->compare('id', $this->id); $criteria->compare( ... ... $criteria->with = array('relation1','relation2','relation3'); $criteria->together = true; return new CActiveDataProvider( get_class($this), array( 'criteria'=>$criteria, 'pagination' => array('pageSize' => 50) ));} But I still get errors like this... CDbCommand failed to execute the SQL statement: SQLSTATE[42S22]: Column not found: 1054 Unknown column 't.relation3' in 'where clause'. The SQL statement executed was: SELECT COUNT(DISTINCT `t`.`id`) FROM `table` `t` LEFT OUTER JOIN `relation_table` `relation0` ON (`t`.`id`=`relation0`.`id`) LEFT OUTER JOIN `relation_table` `relation1` ON (`t`.`id`=`relation1`.`id`) WHERE (`t`.`relation3` < 1234567890) Where relation0 and relation1 are BELONGS_TO relations, but any STAT relations are missing. Furthermore, why is the query a SELECT COUNT(DISTINCT 't'.'id') ?

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  • How to elegantly create a datatable with Django ?

    - by Inshim
    Here's a common situation that I have and wish to avoid creating tedious loops and fiddling with html tables: I have a model Movie, which is has fkeys to Director and to Genre. How can I elegantly render a simple data table that has on one axis the different Directors, on another axis the different Genres, and inside each cell the count of the movies filtered by the respective Director and Genre? Thanks!

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  • NSTimer as a self-targeting ivar.

    - by Matt Wilding
    I have come across an awkward situation where I would like to have a class with an NSTimer instance variable that repeatedly calls a method of the class as long as the class is alive. For illustration purposes, it might look like this: // .h @interface MyClock : NSObject { NSTimer* _myTimer; } - (void)timerTick; @end - // .m @implementation MyClock - (id)init { self = [super init]; if (self) { _myTimer = [[NSTimer scheduledTimerWithTimeInterval:1.0f target:self selector:@selector(timerTick) userInfo:nil repeats:NO] retain]; } return self; } - (void)dealloc { [_myTimer invalidate]; [_myTImer release]; [super dealloc]; } - (void)timerTick { // Do something fantastic. } @end That's what I want. I don't want to to have to expose an interface on my class to start and stop the internal timer, I just want it to run while the class exists. Seems simple enough. But the problem is that NSTimer retains its target. That means that as long as that timer is active, it is keeping the class from being dealloc'd by normal memory management methods because the timer has retained it. Manually adjusting the retain count is out of the question. This behavior of NSTimer seems like it would make it difficult to ever have a repeating timer as an ivar, because I can't think of a time when an ivar should retain its owning class. This leaves me with the unpleasant duty of coming up with some method of providing an interface on MyClock that allows users of the class to control when the timer is started and stopped. Besides adding unneeded complexity, this is annoying because having one owner of an instance of the class invalidate the timer could step on the toes of another owner who is counting on it to keep running. I could implement my own pseudo-retain-count-system for keeping the timer running but, ...seriously? This is way to much work for such a simple concept. Any solution I can think of feels hacky. I ended up writing a wrapper for NSTimer that behaves exactly like a normal NSTimer, but doesn't retain its target. I don't like it, and I would appreciate any insight.

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  • Microsoft Excel 2013

    - by Dan LaMoreaux
    We use a spreadsheet as our timecards. The template is stores on the server with links to it on the individual Desktops. I am trying to figgure out the VB so that wnen the cell for username (B5) is blank, the VB will place next sundays date in (B7). After the user enters thier name in B5, I need it to not change B7 again. If I use a formula in B7 "=IF(B5="",TODAY()+8-WEEKDAY(TODAY()),B7)" i need to enable the curcular calcualtions, which don't follow from the template to the spreadsheet, thus causing errors for every individual. Corporate says that they need to be in Excel, because of the import software. Otherwise I'd use Word and the "CreateDate" function. I've been trying to learn the VB to do it, but I was hoping that soem expert could whip out the code in 5 min. flat and just let me disect it.

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  • Unexpected behavior in Bash

    - by cYrus
    From man bash: A simple command is a sequence of optional variable assignments followed by blank-separated words and redirections, and terminated by a control operator. The first word specifies the command to be executed, and is passed as argument zero. The remaining words are passed as arguments to the invoked command. So it's perfectly legal to write: foo=bar echo $foo but it doesn't work as I expect (it prints just a newline). It's quite strange to me since: $ foo=bar printenv foo=bar TERM=rxvt-unicode [...] Could someone please explain me where I'm doing wrong?

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  • Almost 2013 - Any decent options for mp3 to text? (Speech Recognition)

    - by ajacian81
    I know there's some questions here on s/u regarding converting spoken word mp3 to text, however, most are pretty old (2010 and earlier). I'm just wondering if there's any new legitimate options for this task - if google has shown us anything, speech recognition has come a long way. Personally, I'd prefer a linux based solution, but I'm not picky. I've heard a lot about something called Sphinx, but I tried to set it up and get it going but I couldn't. I know there's a number of different componenents for Sphinx so maybe I was doing it wrong? Either way, are there any new applications for Speech recognition, especially from MP3 files? Thanks!

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  • Calculate # of Rowspans and Colspans based on keys in a Multi-Array

    - by sologhost
    Ok, I have these 2 types of layouts, basically, it can be any layout really. I have decided to use tables for this, since using div tags cause undesirable results in some possible layout types. Here are 2 pics that describe the returned results of row and column: This would return the $layout array like so: $layout[0][0] $layout[0][1] $layout[1][1] In this layout type: $layout[1][0] is NOT SET, or doesn't exist. Row 1, Column 0 doesn't exist in here. So how can we use this to help us determine the rowspans...? Ok, this layout type would now return the following: $layout[0][0] $layout[0][1] $layout[1][0] $layout[2][0] $layout[2][1] $layout[3][1] Again, there are some that are NOT SET in here: $layout[1][1] $layout[3][0] Ok, I have an array called $layout that does a foreach on the row and column, but it doesn't grab the rows and columns that are NOT SET. So I created a for loop (with the correct counts of how many rows there are and how many columns there are). Here's what I got so far: // $not_set = array(); for($x = 0; $x < $cols; $x++) { $f = 0; for($p = 0; $p < $rows; $p++) { // $f = count($layout[$p]); if(!isset($layout[$p][$x])) { $f++; // It could be a rowspan or a Colspan... // We need to figure out which 1 it is! /* $not_set[] = array( 'row' => $p, 'column' => $x, ); */ } // if ($rows - count($layout[$p])) } } Ok, the $layout array has 2 keys. The first 1 is [ row ] and the 2nd key is [ column ]. Now looping through them all and determining whether it's NOT SET, tells me that either a rowspan or a colspan needs to be put into something somewhere. I'm completely lost here. Basically, I would like to have an array returned here, something like this: $spans['row'][ row # ][ column # ] = Number of rowspans for that <td> element. $spans['column'][ row # ][ column # ] = Number of colspans for that <td> element. It's either going to need a colspan or a rowspan, it will definitely never need both for the same element. Am I going about this whole thing the wrong way? Any help at all would be greatly appreciated!! I've been driving myself crazy with this for days! Pllleaase...

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  • Counting longest occurence of repeated sequence in Python

    - by user248237
    What's the easiest way to count the longest consecutive repeat of a certain character in a string? For example, the longest consecutive repeat of "b" in the following string: my_str = "abcdefgfaabbbffbbbbbbfgbb" would be 6, since other consecutive repeats are shorter (3 and 2, respectively.) How can I do this in Python? thanks.

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  • Bash preexecute

    - by Alex_Bender
    I'm trying to write bash command wrapper, which will be patch bash current command on the fly. But i'm faced with the problem. As i'm not a good Shell user, i can't write right expression of variable assignment in string. See bellow: I'm set trap to preexecute, through this: alex@bender:~$ trap "caller >/dev/null || xxx \"\${BASH_COMMAND}"\" DEBUG; I want change variable BASH_COMMAND, do something like BASH_COMMAND=xxx ${BASH_COMMAND} but i don't know, how i need escaping variables in this string NOTE: xxx -- my custom function, which must return some value, if in end of command situated word teststr function xxx(){ # find by grep, if teststr in the end `echo "$1" | grep "teststr$" >/dev/null`; # if true ==> do if [ "$?" == "0" ]; then # cut last 6 chars (len('teststr')==6) var=`echo "$1" | sed 's/......$//'`; echo "$var"; fi } How can i do this stuff?: alex@bender:~$ trap "caller >/dev/null || ${BASH_COMMAND}=`xxx $BASH_COMMAND`" DEBUG;

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  • agent-based simulation: performance issue: Python vs NetLogo & Repast

    - by max
    I'm replicating a small piece of Sugarscape agent simulation model in Python 3. I found the performance of my code is ~3 times slower than that of NetLogo. Is it likely the problem with my code, or can it be the inherent limitation of Python? Obviously, this is just a fragment of the code, but that's where Python spends two-thirds of the run-time. I hope if I wrote something really inefficient it might show up in this fragment: UP = (0, -1) RIGHT = (1, 0) DOWN = (0, 1) LEFT = (-1, 0) all_directions = [UP, DOWN, RIGHT, LEFT] # point is just a tuple (x, y) def look_around(self): max_sugar_point = self.point max_sugar = self.world.sugar_map[self.point].level min_range = 0 random.shuffle(self.all_directions) for r in range(1, self.vision+1): for d in self.all_directions: p = ((self.point[0] + r * d[0]) % self.world.surface.length, (self.point[1] + r * d[1]) % self.world.surface.height) if self.world.occupied(p): # checks if p is in a lookup table (dict) continue if self.world.sugar_map[p].level > max_sugar: max_sugar = self.world.sugar_map[p].level max_sugar_point = p if max_sugar_point is not self.point: self.move(max_sugar_point) Roughly equivalent code in NetLogo (this fragment does a bit more than the Python function above): ; -- The SugarScape growth and motion procedures. -- to M ; Motion rule (page 25) locals [ps p v d] set ps (patches at-points neighborhood) with [count turtles-here = 0] if (count ps > 0) [ set v psugar-of max-one-of ps [psugar] ; v is max sugar w/in vision set ps ps with [psugar = v] ; ps is legal sites w/ v sugar set d distance min-one-of ps [distance myself] ; d is min dist from me to ps agents set p random-one-of ps with [distance myself = d] ; p is one of the min dist patches if (psugar >= v and includeMyPatch?) [set p patch-here] setxy pxcor-of p pycor-of p ; jump to p set sugar sugar + psugar-of p ; consume its sugar ask p [setpsugar 0] ; .. setting its sugar to 0 ] set sugar sugar - metabolism ; eat sugar (metabolism) set age age + 1 end On my computer, the Python code takes 15.5 sec to run 1000 steps; on the same laptop, the NetLogo simulation running in Java inside the browser finishes 1000 steps in less than 6 sec. EDIT: Just checked Repast, using Java implementation. And it's also about the same as NetLogo at 5.4 sec. Recent comparisons between Java and Python suggest no advantage to Java, so I guess it's just my code that's to blame? EDIT: I understand MASON is supposed to be even faster than Repast, and yet it still runs Java in the end.

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  • fill gridview cell-by-cell

    - by raging_boner
    I want to populate GridView below with images: <asp:GridView ID="GrdDynamic" runat="server" AutoGenerateColumns="False"> <Columns> </Columns> </asp:GridView> The code below iterates through directory, then I collect image titles and want them to be populated in gridview. code in bold is not working well, gridview is only filled with the last image in list. List<string> imagelist = new List<string>(); protected void Page_Load(object sender, EventArgs e) { foreach (String image in Directory.GetFiles(Server.MapPath("example/"))) { imagelist.Add("~/example/" + Path.GetFileName(image)); } loadDynamicGrid(imagelist); } private void loadDynamicGrid(List<string> list) { DataTable dt = new DataTable(); DataColumn dcol = new DataColumn(NAME, typeof(System.String)); dt.Columns.Add(dcol); dcol = new DataColumn("NAME1", typeof(System.String)); dt.Columns.Add(dcol); dcol = new DataColumn("NAME2", typeof(System.String)); dt.Columns.Add(dcol); dcol = new DataColumn("NAME3", typeof(System.String)); dt.Columns.Add(dcol); DataRow drow = dt.NewRow(); dt.Rows.Add(); dt.Rows.Add(); **for (int i = 0; i < dt.Rows.Count; i++) { for (int j = 0; j < dt.Columns.Count; j++) { foreach (string value in list) { dt.Rows[i][j] = value; } } }** foreach (DataColumn col in dt.Columns) { ImageField bfield = new ImageField(); bfield.DataImageUrlField = NAME; bfield.HeaderText = col.ColumnName; GrdDynamic.Columns.Add(bfield); } GrdDynamic.DataSource = dt; GrdDynamic.DataBind(); } how to fill gridview cell-by-cell only with available amount of images? i know it is easy, i tried various methods like: dt.Rows.Add(list); and some other attempts, but they didn't work. i'm very stupid. i'd be glad for any help.

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  • Linked List Design

    - by Jim Scott
    The other day in a local .NET group I attend the following question came up: "Is it a valid interview question to ask about Linked Lists when hiring someone for a .NET development position?" Not having a computer sciense degree and being a self taught developer my response was that I did not feel it was appropriate as I in 5 years of developer with .NET had never been exposed to linked lists and did not hear any compeling reason for a use for one. However the person commented that it is a very common interview question so I decided when I left that I would do some reasearch on linked lists and see what I might be missing. I have read a number of posts on stack overflow and various google searches and decided the best way to learn about them was to write my own .NET classes to see how they worked from the inside out. Here is my class structure Single Linked List Constructor public SingleLinkedList(object value) Public Properties public bool IsTail public bool IsHead public object Value public int Index public int Count private fields not exposed to a property private SingleNode firstNode; private SingleNode lastNode; private SingleNode currentNode; Methods public void MoveToFirst() public void MoveToLast() public void Next() public void MoveTo(int index) public void Add(object value) public void InsertAt(int index, object value) public void Remove(object value) public void RemoveAt(int index) Questions I have: What are typical methods you would expect in a linked list? What is typical behaviour when adding new records? For example if I have 4 nodes and I am currently positioned in the second node and perform Add() should it be added after or before the current node? Or should it be added to the end of the list? Some of the designs I have seen explaining things seem to expose outside of the LinkedList class the Node object. In my design you simply add, get, remove values and know nothing about any node object. Should the Head and Tail be placeholder objects that are only used to define the head/tail of the list? I require my Linked List be instantiated with a value which creates the first node of the list which is essentially the head and tail of the list. Would you change that ? What should the rules be when it comes to removing nodes. Should someone be able to remove all nodes? Here is my Double Linked List Constructor public DoubleLinkedList(object value) Properties public bool IsHead public bool IsTail public object Value public int Index public int Count Private fields not exposed via property private DoubleNode currentNode; Methods public void AddFirst(object value) public void AddLast(object value) public void AddBefore(object existingValue, object value) public void AddAfter(object existingValue, object value) public void Add(int index, object value) public void Add(object value) public void Remove(int index) public void Next() public void Previous() public void MoveTo(int index)

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  • replace selfjoin with analytic functions

    - by edwards
    Hi Any ideas how i go about replacing the following self join using analytics SELECT t1.col1 col1, t1.col2 col2, SUM((extract(hour FROM (t1.times_stamp - t2.times_stamp)) * 3600 + extract(minute FROM ( t1.times_stamp - t2.times_stamp)) * 60 + extract(second FROM ( t1.times_stamp - t2.times_stamp)) ) ) div, COUNT(*) tot_count FROM tab1 t1, tab1 t2 WHERE t2.col1 = t1.col1 AND t2.col2 = t1.col2 AND t2.col3 = t1.sequence_num AND t2.times_stamp < t1.times_stamp AND t2.col4 = 3 AND t1.col4 = 4 AND t2.col5 NOT IN(103,123) AND t1.col5 != 549 GROUP BY t1.col1, t1.col2

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  • Zend_Paginator - Increase querys

    - by poru
    Hello, I started using Zend_Paginator, it works everything fine but I noticed that there is one more query which slows the load time down. The additional query: SELECT COUNT(1) AS `zend_paginator_row_count` FROM `content` The normal query: SELECT `content`.`id`, `content`.`name` FROM `content` LIMIT 2 PHP: $adapter = new Zend_Paginator_Adapter_DbSelect($table->select()->from($table, array('id', 'name'))); $paginator = new Zend_Paginator($adapter); Could I merge the two querys into one (for better performance)?

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  • JQuery and PHP display problem

    - by TheCREATOR
    I'm new to JQuery but for some reason I cant get the php code to display correctly when I put it in my JQuery script. The php code will display correctly when its not in the JQuery code can someone help me fix my JQuery code so it will display my PHP code correctly? Here is the JQuery and PHP code. var count = 0; $(function(){ $('p#add_field').click(function(){ count += 1; $('#container').append( '<input type="text" name="sk" id="sk" />' + '<label for="exp">Exp: </label>' + '<?php' + 'echo \'<select id="exp" name="exp">\' . "\n";' + 'foreach($options as $option) {' + 'if ($option == $exp) {' + 'echo \'<option value="\' . stripslashes(htmlentities(strip_tags($option))) . \'" selected="selected">\' .' + ' stripslashes(htmlentities(strip_tags($option))) . \'</option>\' . "\n";' + '} else {' + 'echo \'<option value="\'. stripslashes(htmlentities(strip_tags($option))) . \'">\' .' + 'stripslashes(htmlentities(strip_tags($option))) . \'</option>\'."\n";' + '}' + '}' + 'echo \'</select>\';' + '?>' + '<label for="g">RGB: </label>' + '<?php' + 'echo \'<select id="g" name="g">\' . "\n";' + 'foreach($options as $option) {' + 'if ($option == $g) {' + 'echo \'<option value="\' . stripslashes(htmlentities(strip_tags($option))) . \'" selected="selected">\' .' + 'stripslashes(htmlentities(strip_tags($option))) . \'</option>\' . "\n";' + '} else {' + 'echo \'<option value="\'. stripslashes(htmlentities(strip_tags($option))) . \'">\' .' + 'stripslashes(htmlentities(strip_tags($option))) . \'</option>\'."\n";' + '}' + '}' + 'echo \'</select>\';' + '?></li>' ); }); });

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