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  • Showplan Operator of the Week – BookMark/Key Lookup

    Fabiano continues in his mission to describe the major Showplan Operators used by SQL Server's Query Optimiser. This week he meets a star, the Key Lookup, a stalwart performer, but most famous for its role in ill-performing queries where an index does not 'cover' the data required to execute the query. If you understand why, and in what circumstances, key lookups are slow, it helps greatly with optimising query performance.

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  • Conditional Operator Example

    - by mbcrump
    If you haven’t taken the time to learn conditional operators, then now is the time. I’ve added a quick and dirty example for those on the forums.   Code Snippet using System; using System.Net.Mail; using System.Net; using System.Globalization; using System.Windows.Forms;   class Demo {     //Please use conditional statements in your code. See example below.       public static void Main()     {         int dollars = 10;           //Bad Coder Bad !!! Don't do this         if (dollars == 1)         {             Console.WriteLine("Please deposit {0} dollar.", dollars);         }         else         {             Console.WriteLine("Please deposit {0} dollars.", dollars);         }             //Good Coder Good !!! Do this         Console.WriteLine("Please deposit {0} dollar{1}.", dollars, dollars == 1 ? ' ' : 's');         //                                                          expression   ? true : false           Console.ReadLine();          } }

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  • LINQ and the use of Repeat and Range operator

    - by vik20000in
    LINQ is also very useful when it comes to generation of range or repetition of data.  We can generate a range of data with the help of the range method.     var numbers =         from n in Enumerable.Range(100, 50)         select new {Number = n, OddEven = n % 2 == 1 ? "odd" : "even"}; The above query will generate 50 records where the record will start from 100 till 149. The query also determines if the number is odd or even. But if we want to generate the same number for multiple times then we can use the Repeat method.     var numbers = Enumerable.Repeat(7, 10); The above query will produce a list with 10 items having the value 7. Vikram

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  • Operator of the Week - Spools, Eager Spool

    For the fifth part of Fabiano's mission to describe the major Showplan Operators used by SQL Server's Query Optimiser, he introduces the spool operators and particularly the Eager Spool, explains blocking and non-blocking and then describes how the Halloween Problem is avoided.

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  • Showplan Operator of the week - Assert

    As part of his mission to explain the Query Optimiser in practical terms, Fabiano attempts the feat of describing, one week at a time, all the major Showplan Operators used by SQL Server's Query Optimiser to build the Query Plan. He starts with Assert

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  • OPTIONS * HTTP/1.0 APACHE

    - by Abby E
    I been noticing a lot lately in my /server-status the OPTIONS * HTTP/1.0 has been coming up lately a lot. I'm running Ubuntu 12.04 with the latest apache/php/MySQL. I'm not sure what they're for but I would like to see if it would effect performance by some how turning it off. I host some stuff that is accessed a lot that uses PHP/MySQL (600 rps). I'm not sure what it's there for but I do see the local 127.0.0.1 IP, so I assume it's something running local. What is it? How do your turn it off? If turned off how would it effect performance? The list below is a small example of it. (127.0.0.1 REMOVED.(null) hostname has been removed) 211-0 - 0/0/1035 . 24.28 240189 0 0.0 0.00 0.18 127.0.0.1 REMOVED.(null) OPTIONS * HTTP/1.0 212-0 - 0/0/51274 . 677.97 202960 0 0.0 0.00 8.99 127.0.0.1 REMOVED.(null) OPTIONS * HTTP/1.0 213-0 - 0/0/419 . 11.85 240424 0 0.0 0.00 0.07 127.0.0.1 REMOVED.(null) OPTIONS * HTTP/1.0 214-0 - 0/0/240 . 7.96 240552 0 0.0 0.00 0.04 127.0.0.1 REMOVED.(null) OPTIONS * HTTP/1.0 215-0 - 0/0/309 . 9.29 240492 0 0.0 0.00 0.05 127.0.0.1 REMOVED.(null) OPTIONS * HTTP/1.0 216-0 - 0/0/98510 . 1258.25 177391 0 0.0 0.00 17.29 127.0.0.1 REMOVED.(null) OPTIONS * HTTP/1.0 217-0 - 0/0/338 . 10.18 240464 0 0.0 0.00 0.06 127.0.0.1 REMOVED.(null) OPTIONS * HTTP/1.0 218-0 - 0/0/345 . 10.27 240469 0 0.0 0.00 0.06 127.0.0.1 REMOVED.(null) OPTIONS * HTTP/1.0 219-0 - 0/0/118538 . 1507.99 168914 0 0.0 0.00 20.80 127.0.0.1 REMOVED.(null) OPTIONS * HTTP/1.0 220-0 - 0/0/98452 . 1259.10 177412 0 0.0 0.00 17.29 127.0.0.1 REMOVED.(null) OPTIONS * HTTP/1.0 221-0 - 0/0/384 . 10.84 240453 0 0.0 0.00 0.06 127.0.0.1 REMOVED.(null) OPTIONS * HTTP/1.0 222-0 - 0/0/331 . 10.03 240477 0 0.0 0.00 0.06 127.0.0.1 REMOVED.(null) OPTIONS * HTTP/1.0 223-0 - 0/0/314 . 9.04 240493 0 0.0 0.00 0.05 127.0.0.1 REMOVED.(null) OPTIONS * HTTP/1.0 224-0 - 0/0/75193 . 975.24 188845 0 0.0 0.00 13.18 127.0.0.1 REMOVED.(null) OPTIONS * HTTP/1.0 225-0 - 0/0/362 . 10.62 240457 0 0.0 0.00 0.06 127.0.0.1 REMOVED.(null) OPTIONS * HTTP/1.0 226-0 - 0/0/125773 . 1593.26 165647 0 0.0 0.00 22.06 127.0.0.1 REMOVED.(null) OPTIONS * HTTP/1.0 227-0 - 0/0/82541 . 1063.89 185092 0 0.0 0.00 14.48 127.0.0.1 REMOVED.(null) OPTIONS * HTTP/1.0 228-0 - 0/0/409 . 11.50 240436 0 0.0 0.00 0.07 127.0.0.1 REMOVED.(null) OPTIONS * HTTP/1.0 229-0 - 0/0/219 . 7.38 240581 0 0.0 0.00 0.04 127.0.0.1 REMOVED.(null) OPTIONS * HTTP/1.0 230-0 - 0/0/357 . 10.48 240458 0 0.0 0.00 0.06 127.0.0.1 REMOVED.(null) OPTIONS * HTTP/1.0 231-0 - 0/0/469 . 12.39 240411 0 0.0 0.00 0.08 127.0.0.1 REMOVED.(null) OPTIONS * HTTP/1.0 232-0 - 0/0/394 . 11.32 240445 0 0.0 0.00 0.07 127.0.0.1 REMOVED.(null) OPTIONS * HTTP/1.0 233-0 - 0/0/276 . 9.00 240510 0 0.0 0.00 0.05 127.0.0.1 REMOVED.(null) OPTIONS * HTTP/1.0 234-0 - 0/0/245 . 8.51 240536 0 0.0 0.00 0.04 127.0.0.1 REMOVED.(null) OPTIONS * HTTP/1.0 235-0 - 0/0/215 . 7.45 240555 0 0.0 0.00 0.04 127.0.0.1 REMOVED.(null) OPTIONS * HTTP/1.0 236-0 - 0/0/370 . 11.00 240443 0 0.0 0.00 0.06 127.0.0.1 REMOVED.(null) OPTIONS * HTTP/1.0 237-0 - 0/0/400 . 10.96 240446 0 0.0 0.00 0.07 127.0.0.1 REMOVED.(null) OPTIONS * HTTP/1.0 238-0 - 0/0/266 . 8.51 240531 0 0.0 0.00 0.04 127.0.0.1 REMOVED.(null) OPTIONS * HTTP/1.0 239-0 - 0/0/304 . 9.81 240499 0 0.0 0.00 0.05 127.0.0.1 REMOVED.(null) OPTIONS * HTTP/1.0 240-0 - 0/0/446 . 12.47 240421 0 0.0 0.00 0.08 127.0.0.1 REMOVED.(null) OPTIONS * HTTP/1.0 241-0 - 0/0/19741 . 282.90 230130 0 0.0 0.00 3.45 127.0.0.1 REMOVED.(null) OPTIONS * HTTP/1.0 242-0 - 0/0/98503 . 1259.43 177404 0 0.0 0.00 17.28 127.0.0.1 REMOVED.(null) OPTIONS * HTTP/1.0 243-0 - 0/0/251 . 7.93 240551 0 0.0 0.00 0.04 127.0.0.1 REMOVED.(null) OPTIONS * HTTP/1.0 244-0 - 0/0/273 . 8.42 240534 0 0.0 0.00 0.05 127.0.0.1 REMOVED.(null) OPTIONS * HTTP/1.0 245-0 - 0/0/118485 . 1508.14 168950 0 0.0 0.00 20.79 127.0.0.1 REMOVED.(null) OPTIONS * HTTP/1.0 246-0 - 0/0/294 . 9.35 240509 0 0.0 0.00 0.05 127.0.0.1 REMOVED.(null) OPTIONS * HTTP/1.0 247-0 - 0/0/413 . 12.34 240437 0 0.0 0.00 0.07 127.0.0.1 REMOVED.(null) OPTIONS * HTTP/1.0 248-0 - 0/0/258 . 8.55 240529 0 0.0 0.00 0.04 127.0.0.1 REMOVED.(null) OPTIONS * HTTP/1.0 249-0 - 0/0/303 . 9.77 240485 0 0.0 0.00 0.05 127.0.0.1 REMOVED.(null) OPTIONS * HTTP/1.0

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  • Ruby: if statement using regexp and boolean operator [migrated]

    - by bev
    I'm learning Ruby and have failed to make a compound 'if' statement work. Here's my code (hopefully self explanatory) commentline = Regexp.new('^;;') blankline = Regexp.new('^(\s*)$') if (line !~ commentline || line !~ blankline) puts line end the variable 'line' is gotten from reading the following file: ;; alias filename backupDir Prog_i Prog_i.rb ./store Prog_ii Prog_ii.rb ./store This fails and I'm not sure why. Basically I want the comment lines and blank lines to be ignored during the processing of the lines in the file. Thanks for your help.

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  • Showplan Operator of the Week – BookMark/Key Lookup

    Fabiano continues in his mission to describe the major Showplan Operators used by SQL Server's Query Optimiser. This week he meets a star, the Key Lookup, a stalwart performer, but most famous for its role in ill-performing queries where an index does not 'cover' the data required to execute the query. If you understand why, and in what circumstances, key lookups are slow, it helps greatly with optimising query performance.

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  • Problem creating a database with PHP PDO

    - by Leandro Alonso
    Hello guys, I'm having a problem with a SQL query in my PHP Application. When the user access it for the first time, the app executes this query to create all the database: CREATE TABLE `databases` ( `id` bigint(20) NOT NULL auto_increment, `driver` varchar(45) NOT NULL, `server` text NOT NULL, `user` text NOT NULL, `password` text NOT NULL, `database` varchar(200) NOT NULL, PRIMARY KEY (`id`) ) ENGINE=InnoDB DEFAULT CHARSET=latin1 AUTO_INCREMENT=2 ; -- -------------------------------------------------------- -- -- Table structure for table `modules` -- CREATE TABLE `modules` ( `id` bigint(20) unsigned NOT NULL auto_increment, `title` varchar(100) NOT NULL, `type` varchar(150) NOT NULL, PRIMARY KEY (`id`) ) ENGINE=InnoDB DEFAULT CHARSET=latin1 AUTO_INCREMENT=29 ; -- -------------------------------------------------------- -- -- Table structure for table `modules_data` -- CREATE TABLE `modules_data` ( `id` bigint(20) NOT NULL auto_increment, `module_id` bigint(20) unsigned NOT NULL, `key` varchar(150) NOT NULL, `value` tinytext, PRIMARY KEY (`id`), KEY `fk_modules_data_modules` (`module_id`) ) ENGINE=InnoDB DEFAULT CHARSET=latin1 AUTO_INCREMENT=184 ; -- -------------------------------------------------------- -- -- Table structure for table `modules_position` -- CREATE TABLE `modules_position` ( `user_id` bigint(20) unsigned NOT NULL, `tab_id` bigint(20) unsigned NOT NULL, `module_id` bigint(20) unsigned NOT NULL, `column` smallint(1) default NULL, `line` smallint(1) default NULL, PRIMARY KEY (`user_id`,`tab_id`,`module_id`), KEY `fk_modules_order_users` (`user_id`), KEY `fk_modules_order_tabs` (`tab_id`), KEY `fk_modules_order_modules` (`module_id`) ) ENGINE=InnoDB DEFAULT CHARSET=latin1; -- -------------------------------------------------------- -- -- Table structure for table `tabs` -- CREATE TABLE `tabs` ( `id` bigint(20) unsigned NOT NULL auto_increment, `title` varchar(60) NOT NULL, `columns` smallint(1) NOT NULL, PRIMARY KEY (`id`) ) ENGINE=InnoDB DEFAULT CHARSET=latin1 AUTO_INCREMENT=12 ; -- -------------------------------------------------------- -- -- Table structure for table `tabs_has_modules` -- CREATE TABLE `tabs_has_modules` ( `tab_id` bigint(20) unsigned NOT NULL, `module_id` bigint(20) unsigned NOT NULL, PRIMARY KEY (`tab_id`,`module_id`), KEY `fk_tabs_has_modules_tabs` (`tab_id`), KEY `fk_tabs_has_modules_modules` (`module_id`) ) ENGINE=InnoDB DEFAULT CHARSET=latin1; -- -------------------------------------------------------- -- -- Table structure for table `users` -- CREATE TABLE `users` ( `id` bigint(20) unsigned NOT NULL auto_increment, `login` varchar(60) NOT NULL, `password` varchar(64) NOT NULL, `email` varchar(100) NOT NULL, `name` varchar(250) default NULL, `user_level` bigint(20) unsigned NOT NULL, PRIMARY KEY (`id`), KEY `fk_users_user_levels` (`user_level`) ) ENGINE=InnoDB DEFAULT CHARSET=latin1 AUTO_INCREMENT=4 ; -- -------------------------------------------------------- -- -- Table structure for table `users_has_tabs` -- CREATE TABLE `users_has_tabs` ( `user_id` bigint(20) unsigned NOT NULL, `tab_id` bigint(20) unsigned NOT NULL, `order` smallint(2) NOT NULL, `columns_width` varchar(255) default NULL, PRIMARY KEY (`user_id`,`tab_id`), KEY `fk_users_has_tabs_users` (`user_id`), KEY `fk_users_has_tabs_tabs` (`tab_id`) ) ENGINE=InnoDB DEFAULT CHARSET=latin1; -- -------------------------------------------------------- -- -- Table structure for table `user_levels` -- CREATE TABLE `user_levels` ( `id` bigint(20) unsigned NOT NULL auto_increment, `level` smallint(2) NOT NULL, PRIMARY KEY (`id`) ) ENGINE=InnoDB DEFAULT CHARSET=latin1 AUTO_INCREMENT=3 ; -- -------------------------------------------------------- -- -- Table structure for table `user_meta` -- CREATE TABLE `user_meta` ( `id` bigint(20) unsigned NOT NULL auto_increment, `user_id` bigint(20) unsigned default NULL, `key` varchar(150) NOT NULL, `value` longtext NOT NULL, PRIMARY KEY (`id`), KEY `fk_user_meta_users` (`user_id`) ) ENGINE=InnoDB DEFAULT CHARSET=latin1 AUTO_INCREMENT=4 ; -- -- Constraints for dumped tables -- -- -- Constraints for table `modules_data` -- ALTER TABLE `modules_data` ADD CONSTRAINT `fk_modules_data_modules` FOREIGN KEY (`module_id`) REFERENCES `modules` (`id`) ON DELETE CASCADE ON UPDATE NO ACTION; -- -- Constraints for table `modules_position` -- ALTER TABLE `modules_position` ADD CONSTRAINT `fk_modules_order_modules` FOREIGN KEY (`module_id`) REFERENCES `modules` (`id`) ON DELETE CASCADE ON UPDATE NO ACTION, ADD CONSTRAINT `fk_modules_order_tabs` FOREIGN KEY (`tab_id`) REFERENCES `tabs` (`id`) ON DELETE CASCADE ON UPDATE NO ACTION, ADD CONSTRAINT `fk_modules_order_users` FOREIGN KEY (`user_id`) REFERENCES `users` (`id`) ON DELETE CASCADE ON UPDATE NO ACTION; -- -- Constraints for table `users` -- ALTER TABLE `users` ADD CONSTRAINT `fk_users_user_levels` FOREIGN KEY (`user_level`) REFERENCES `user_levels` (`id`) ON DELETE NO ACTION ON UPDATE NO ACTION; -- -- Constraints for table `user_meta` -- ALTER TABLE `user_meta` ADD CONSTRAINT `fk_user_meta_users` FOREIGN KEY (`user_id`) REFERENCES `users` (`id`) ON DELETE CASCADE ON UPDATE NO ACTION; INSERT INTO `user_levels` VALUES(1, 10); INSERT INTO `user_levels` VALUES(2, 1); INSERT INTO `users` VALUES(1, 'admin', 'password', '[email protected]', NULL, 1); INSERT INTO `user_meta` VALUES (NULL, 1, 'last_tab', 1); In some environments i get this error: SQLSTATE[HY000]: General error: 1005 Can't create table 'dms.databases' (errno: 150) I tried everything that I could find on Google but nothing works. The strange part is that if I run this query in PhpMyAdmin he creates my database, without any error.

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  • How do I overload an operator for an enumeration in C#?

    - by ChrisHDog
    I have an enumerated type that I would like to define the , <, =, and <= operators for. I know that these operators are implictly created on the basis of the enumerated type (as per the documentation) but I would like to explictly define these operators (for clarity, for control, to know how to do it, etc...) I was hoping I could do something like: public enum SizeType { Small = 0, Medium = 1, Large = 2, ExtraLarge = 3 } public SizeType operator >(SizeType x, SizeType y) { } But this doesn't seem to work ("unexpected toke") ... is this possible? It seems like it should be since there are implictly defined operators. Any suggestions?

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  • How does delete deal with pointer constness?

    - by aJ
    I was reading this question Deleting a const pointer and wanted to know more about delete behavior. Now, as per my understanding: delete expression works in two steps: invoke destructor then releases the memory (often with a call to free()) by calling operator delete. operator delete accepts a void*. As part of a test program I overloaded operator delete and found that operator delete doesn't accept const pointer. Since operator delete does not accept const pointer and delete internally calls operator delete, how does Deleting a const pointer work ? Does delete uses const_cast internally?

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  • Why would the assignment operator ever do something different than its matching constructor?

    - by Neil G
    I was reading some boost code, and came across this: inline sparse_vector &assign_temporary(sparse_vector &v) { swap(v); return *this; } template<class AE> inline sparse_vector &operator=(const sparse_vector<AE> &ae) { self_type temporary(ae); return assign_temporary(temporary); } It seems to be mapping all of the constructors to assignment operators. Great. But why did C++ ever opt to make them do different things? All I can think of is scoped_ptr?

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  • Why does javascript's "in" operator return true when testing if 0 exists in an array that doesn't co

    - by Mariano Peterson
    For example, this returns true, and makes sense: var x = [1,2]; 1 in x; // true This returns false, and makes sense: var x = [1,2]; 3 in x; // false However this returns true, and I don't understand why: var x = [1,2]; 0 in x; You can quickly test it by putting this in your browser's address bar: javascript:var x=[1,2]; alert(0 in x); Why does the "in" operator in Javascript return true when testing if "0" exists in array, even when the array doesn't appear to contain "0"?

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  • C++: Overload != When == Overloaded

    - by Mark W
    Say I have a class where I overloaded the operator == as such: Class A { ... public: bool operator== (const A &rhs) const; ... }; ... bool A::operator== (const A &rhs) const { .. return isEqual; } I already have the operator == return the proper Boolean value. Now I want to extend this to the simple opposite (!=). I would like to call the overloaded == operator and return the opposite, i.e. something of the nature bool A::operator!= (const A &rhs) const { return !( this == A ); } Is this possible? I know this will not work, but it exemplifies what I would like to have. I would like to keep only one parameter for the call: rhs. Any help would be appreciated, because I could not come up with an answer after several search attempts.

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  • ASP.NET: Why is my JavaScript object set to null?

    - by Giffyguy
    I have a <script> that contains this line: var tbl = document.getElementById("<%= this.tblSelection.ClientID %>"); ... but tbl always ends up being set to null. The table is declared like this: <asp:Table ID="tblSelection" runat="server" CellPadding="2" CellSpacing="0" cols="1" style="position: absolute; top: 0%; right: 0%"> Both the script and the table are in the same master page file. What could be causing this? EDIT: I should mention that this script is executed on onload

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  • Can I get a faster output pipe than /dev/null ?

    - by naugtur
    Hi I am running a huge task [automated translation scripted with perl + database etc.] to run for about 2 weeks non-stop. While thinking how to speed it up I saw that the translator outputs everything (all translated sentences, all info on the way) to STDOUT all the time. This makes it work visibly slower when I get the output on the console. I obviously piped the output to /dev/null, but then I thought "could there be something even faster?" It's so much output that it'd really make a difference. And that's the question I'm asking You, because as far as I know there is nothing faster... (But I'm far from being a guru having used linux on a daily basis only last 3 years)

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  • C++: Why don't I need to check if references are invalid/null?

    - by jbu
    Hi all, Reading http://www.cprogramming.com/tutorial/references.html, it says: In general, references should always be valid because you must always initialize a reference. This means that barring some bizarre circumstances (see below), you can be certain that using a reference is just like using a plain old non-reference variable. You don't need to check to make sure that a reference isn't pointing to NULL, and you won't get bitten by an uninitialized reference that you forgot to allocate memory for. My question is how do I know that the object's memory hasn't been freed/deleted AFTER you've initialized the reference. What it comes down to is that I can't take this advice on faith and I need a better explanation. Can anyone shed some light? Thanks, jbu

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  • Eclipse bug? Switching on a null with only default case

    - by polygenelubricants
    I was experimenting with enum, and I found that the following compiles and runs fine on Eclipse (Build id: 20090920-1017, not sure exact compiler version): public class SwitchingOnAnull { enum X { ,; } public static void main(String[] args) { X x = null; switch(x) { default: System.out.println("Hello world!"); } } } When compiled and run with Eclipse, this prints "Hello world!" and exits normally. With the javac compiler, this throws a NullPointerException as expected. So is there a bug in Eclipse Java compiler?

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  • Is apparent NULL pointer dereference in C actually pointer arithmetic?

    - by karthik A
    hey ive got this piece of code. It dereferences a null pointer here. But then there is an and with unsigned int. I really dont understand the whole part. Can someone explain the output.?? struct hi { long a; int b; long c; }; int main() { struct hi ob={3,4,5}; struct hi *ptr=&ob; int num= (unsigned int) & (((struct hi *)0)->b); printf("%d",num); printf("%d",*(int *)((char *)ptr + (unsigned int) & (((struct hi *)0)->b))); } The output I get is 44. But how does it work?

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  • How do I overload the square-bracket operator in C#?

    - by Coderer
    DataGridView, for example, lets you do this: DataGridView dgv = ...; DataGridViewCell cell = dgv[1,5]; but for the life of me I can't find the documentation on the index/square-bracket operator. What do they call it? Where is it implemented? Can it throw? How can I do the same thing in my own classes? ETA: Thanks for all the quick answers. Briefly: the relevant documentation is under the "Item" property; the way to overload is by declaring a property like public object this[int x, int y]{ get{...}; set{...} }; the indexer for DataGridView does not throw, at least according to the documentation. It doesn't mention what happens if you supply invalid coordinates. ETA Again: OK, even though the documentation makes no mention of it (naughty Microsoft!), it turns out that the indexer for DataGridView will in fact throw an ArgumentOutOfRangeException if you supply it with invalid coordinates. Fair warning.

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  • How do I overload () operator with two parameters; like (3,5)?

    - by hkBattousai
    I have a mathematical matrix class. It contains a member function which is used to access any element of the class. template >class T> class Matrix { public: // ... void SetElement(T dbElement, uint64_t unRow, uint64_t unCol); // ... }; template <class T> void Matrix<T>::SetElement(T Element, uint64_t unRow, uint64_t unCol) { try { // "TheMatrix" is define as "std::vector<T> TheMatrix" TheMatrix.at(m_unColSize * unRow + unCol) = Element; } catch(std::out_of_range & e) { // Do error handling here } } I'm using this method in my code like this: // create a matrix with 2 rows and 3 columns whose elements are double Matrix<double> matrix(2, 3); // change the value of the element at 1st row and 2nd column to 6.78 matrix.SetElement(6.78, 1, 2); This works well, but I want to use operator overloading to simplify things, like below: Matrix<double> matrix(2, 3); matrix(1, 2) = 6.78; // HOW DO I DO THIS?

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  • deploying security enabled app to WLS - null Password Given Error

    - by raghu.yadav
    if you notice "null password given Error" while accessing the security enabled app deployed in wls, follow below instructions.set the property -Djps.app.credential.overwrite.allowed=true to JAVA_PROPERTIES env within setDomainEnv.sh also ensure you run server in development mode.edit setDomainEnv.sh and set -Dweblogic.ProductionModeEnabled=false and startup the servers, now you access the app and then shutdown server and revert the -Dweblogic.ProductionModeEnabled=false to -Dweblogic.ProductionModeEnabled=true that's it.

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  • Using SET NULL and SET DEFAULT with Foreign Key Constraints

    Cascading Updates and Deletes, introduced with SQL Server 2000, were such an important, crucial feature that it is hard to imagine providing referential integrity without them. One of the new features in SQL Server 2005 that hasn't gotten a lot of press from what I've read is the new options for the ON DELETE and ON UPDATE clauses: SET NULL and SET DEFAULT. Let's take a look!

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