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• Convert ten character classification string into four character one in C#

  - by mare

  What's the best way to convert (to hash) a string like 3800290030, which represents an id for a classification into a four character one like 3450 (I need to support at max 9999 classes). The hash needs to be unique and always the same for the same an input. If possible, the hash should also be reversible (but this is not required).

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• C#:checking existing record in database Mysql

  - by Meko

  HI.I searched this question inform and I found solution to change column property Unique Index.Now If I try to insert same record cmd.ExecuteNonQuery() gives error that record exist ,but how can use this exception to give user a message that record exist and must enter new one ? I am trying to make some thing like if(cmd.ExecuteNonQuery() !=true ) { MessageBox.Show("User Exists"); } But I dont know what returns cmd.ExecuteNonQuery() ? Or I must get records using reader in table and compare them with text in Textfiel?

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• django multi-language (i18n) and seo

  - by fumer

  hi, I am developing a multi-language site in django. In order to improve SEO, i will give every language version a unique URL like below, english: www.foo.com/en/index.html french: www.foo.com/fr/index.html chinese: www.foo.com/zh/index.html However, Django looks for a "django_language" key in user's session or cookie to determine language in default, so,Despite which language user chose, URL is always the same. for instance: http://www.foo.com/index.html how to resolve this problem ? thank you!

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• Why this query is so slow?

  - by Silver Light

  This query appears in mysql slow query log: it takes 11 seconds. INSERT INTO record_visits ( record_id, visit_day ) VALUES ( '567', NOW() ); The table has 501043 records and it's structure looks like this: CREATE TABLE IF NOT EXISTS `record_visits` ( `id` int(11) NOT NULL AUTO_INCREMENT, `record_id` int(11) DEFAULT NULL, `visit_day` date DEFAULT NULL, `visit_cnt` bigint(20) DEFAULT '1', PRIMARY KEY (`id`), UNIQUE KEY `record_id_visit_day` (`record_id`,`visit_day`) ) ENGINE=MyISAM DEFAULT CHARSET=utf8 ; What could be wrong? Why this INSERT takes so long?

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• How should a Gnome applet store its configuration data?

  - by George Edison

  I have a Gnome applet written in Python. In order to save configuration data/settings, it creates a file ~/.appname. However, this prevents multiple instances of the applet from being added to the panel because each cannot have its own settings. How can I store the settings in a way that allows each instance to have its own unique settings? Update: I specifically want to know how to store settings per instance.

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• (database design):Which tables should be created for all kindes files (images, attached email files,

  - by meyosef

  Hi, I new in database design: I have question with my own few solution,what do you thinks?: Which tables should be created for all kinds files (images, attached email files,text files for store email body, etc..) that stored in my online store? *option 1:use seperate table for files types * files{ id files_types_id FK file_path file_extension } files_types{ id type_name (unique) } *option 2: use bool field for each file type * files{ id file_path file_extension is_image_main is_image_icon is_image_logo is_pdf_file is_text_file } **option 3: use 1 enum field 'file_type' for each file type ** files{ id file_path file_extension file_type (image_main,image_icon,image_logo,image_main,pdf,text) **enum** } Thanks you, Yosef

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• Does array contain a specific value

  - by padatronic

  Hi chaps, I have an array of nsdictionaries and one key is ID (which is unique) I simply want to see if the the array of dictionaries contains a specific ID. Really simple but its friday and after statiny up watching the election i think my brain is melting. Any help would be great. Thanks

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• Merging list problem

  - by Martin Malmstrøm

  Sorry about the bad heading, but the question was not easy to compress into one sentence... I have two lists of contigs (list1 and list2). They contain mostly unique contigs, but with some overlap. I want to compare list1 and list2 and then create a list3 that contains all contigs in list1 minus those also present in list2. Is this possible with a simple cat/paste/grep/sort/uniq kind of batch command? Thanks!

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• jpa-Google app engine

  - by megala

  I had created entity in google app engie datastore using JPA.I set the id as follows @Id @GeneratedValue(strategy=GenerationType.SEQUENCE) private Long s; After i deployed my applicaiton it give identity (i.e) unique value.but igive 1001,1002,1003 ....as id.But i wnat 1,2,3,4,5 like that.how to achive this? Thanks in advance

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• sqlite, UPDATE OR REPLACE

  - by acidzombie24

  I do something like UPDATE OR REPLACE someTable SET a=1, b=2 WHERE c=3 I expect if it doesnt exist it will be inserted into the DBs. But nothing happens and i get no errors. How can i insert data, replace it if it already exist and use a where for the condition (instead of replacing BC of a unique ID)

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• How to have multiple parts of a website in one page

  - by stas

  I want to make a website that will have multiple pages, but because of a unique navigation bar, I cannot simply link to a new file for each page. What is the best way to accomplish this. Some possibilities that I can think of are having all of them on one page, but using css and javascript to move the other pages offscreen, or using iframes and loading them with javascript. Could someone please direct me to some examples or tutorials?

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• Adding a clustered index to a SQL table: what dangers exist for a live production system?

  - by MoSlo

  Right, keep in mind i need to describe this by abstracting all possible confidential info: I've been put in charge of a 10-year old transactional system of which the majority business logic is implemented at database level (triggers, stored procedures etc). Win2000 server, MSSQL 2000 Enterprise. No immediate plans for replacing/updating the system are being considered :( The core process is a program that executes transactions - specifically, it executes a stored procedure with various parameters, lets call it sp_ProcessTrans. The program executes the stored procedure at asynchronous intervals. By itself, things work fine. But there are 30 instances of this program on remotely located workstations, all of them asynchronously executing sp_ProcessTrans and then retrieving data from the SQL server (execution is pretty regular - ranging 0 to 60 times a minute, depending on what items the program instance is responsible for) . Performance of the system has dropped considerably with 10 yrs of data growth: the reason is the deadlocks and specifically deadlock wait times. The deadlock is on the Employee table. I have discovered: In sp_ProcessTrans' execution, it selects from an Employee table 7 times (dont ask) The select is done on a field that is NOT the primary key No index exists on this field. Thus a table scan is performed. 7 times. per transaction So the reason for deadlocks is clear. I created a non-unique ordered clustered index on the field (field looks good, almost unique, NUM(7), very rarely changes). Immediate improvement in the test environment. The problem is that i cannot simulate the deadlocks in a test environment (I'd need 30 workstations; i'd need to simulate 'realistic' activity on those stations, so visualization is out). I need to know if i must schedule downtime. Creating an index shouldn't be a risky operation for MSSQL, but is there any danger (data corruption in transactions/select statements/extra wait time etc) to create this field index on the production database while the transactions are still taking place? (although i can select a time when transactions are fairly quiet through the 30 stations) Are there any hidden dangers i'm not seeing (not looking forward to needing to restore the DB if something goes wrong, restoring would take a lot of time with 10yrs of data).

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• Can an html element have multiple ids?

  - by webmat

  I understand that an id must be unique within an HTML/XHTML page. My question is, for a given element, can I assign multiple ids to it? <div id="nested_element_123 task_123"></div> I realize I have an easy solution with simply using a class. I'm just curious about using ids in this manner.

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• How to get a value from the last inserted row?

  - by eflles

  Is there some way to get a value from the last inserted row? I am inserting a row where the PK will automatically increase, and I would like to get this PK. Only the PK is guaranteed to be unique in the table. I am using Java with a JDBC and PostgreSQL.

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• SQL subquery question

  - by seo20

  I have the following SQL SELECT Seq.UserSessionSequenceID, Usr.SessionGuid, Usr.UserSessionID, Usr.SiteID, Seq.Timestamp, Seq.UrlTitle, Seq.Url FROM tblUserSession Usr INNER JOIN tblUserSessionSequence Seq ON Usr.UserSessionID = Seq.UserSessionID WHERE (Usr.Timestamp > DATEADD(mi, -45, GETDATE())) AND (Usr.SiteID = 15) ORDER BY Usr.Timestamp DESC Pretty simple stuff. There are by nature multiple UserSessionIDs rows in tblUserSessionSequence. I ONLY want to return the latest (top 1) row with unique UserSessionID. How do I do that?

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• Count total number of callers?

  - by Kristopher Ives

  I'm currently doing this query to find the guy who makes the most calls: SELECT `commenter_name`, COUNT(*) AS `calls` FROM `comments` GROUP BY `commenter_name` ORDER BY `calls` LIMIT 1 What I want now is to be able to find out how many total unique callers. I tried using DISTINCT but I didn't get anywhere.

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• How to map UID to user name using Perl library functions?

  - by Mike

  I'm looking for a way of mapping a uid (unique number representing a system user) to a user name using Perl. Please don't suggest greping /etc/passwd :) Edit As a clarification, I wasn't looking for a solution that involved reading /etc/passwd explicitly. I realize that under the hood any solution would end up doing this, but I was searching for a library function to do it for me.

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• views count calculation

  - by Alexey Poimtsev

  Hi, could you give me idea how to calculate unique views of page? If i will increase counter on each page load it will be no good, otherside storing information of viewed pages in session looks like not ideal solution.

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• Inserting random characters to MYSQL Database

  - by spotlightsnap

  I want to add 100 entry to users table numbers field, random characters length is 10, all entry should be unique as well. How can i achieve this using MYSQL query code ? Or do i need to use PHP ? Help me with code snippets please. Thanks.

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• Basic question about encryption - what exactly are keys?

  - by Tomas

  Hi, I was browsing and found good articles about encryption. However, none of them described why the key lenght is important and what exactly the key is used for. My guess is that could work this way: 0101001101010101010 Key: 01010010101010010101 //the longer the key, the longer unique sequence XOR or smth: //result Is this at least a bit how it works or I am missing something? Thanks

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• How do I represent integer array as attribute of a class in Visual Studio 2010's UML class diagrams?

  - by AndrejaKo

  How do I represent integer array as attribute of a class in Visual Studio 2010's UML class diagrams? I know hot to add normal integers, but I'm hoping that there is a way to do it other than adding [] to integer's name. I'm new to UML, so I could be missing something obvious here. Should I use Is ordered and Is unique?

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• Can I set ignore_dup_key on for a primary key?

  - by Mr. Flibble

  I have a two-column primary key on a table. I have attempted to alter it to set the ignore_dup_key to on with this command: ALTER INDEX PK_mypk on MyTable SET (IGNORE_DUP_KEY = ON); But I get this error: Cannot use index option ignore_dup_key to alter index 'PK_mypk' as it enforces a primary or unique constraint. How else should I set IGNORE_DUP_KEY to on?

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• Help getting the following create table function to work with mysql and C#

  - by Matt

  string createTable = "CREATE TABLE IF NOT EXISTS " + m_strDatabase + "_TimeLogs (logName VARCHAR(16), logTime INTEGER, logCountry TEXT, UNIQUE(logName)) TYPE=MyISAM;"; When this runs, no table is created. No errors either. Im using an ODBC connector. the variable passes in the db name, so that the table created would be users_TimeLogs if the database was called users for example. Am I doing something wrong?

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• How to Calculate longest streak in SQL?

  - by VJ

  I have EMPLOYEE-ID,DATE,IsPresent I want to calculate longest streak for a employee presence.The Present bit will be false for days he didnt come..So I want to calculate the longest number of days he came to office for consecutive dates..I have the Date column field is unique...So I tried this way - Select Id,Count(*) from Employee where IsPresent=1 But the above doesnt work...Can anyone guide me towards how I can calculate streak for this?....I am sure people have come across this...I tried searching online but...didnt understand it well...please help me out..

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• Perl, map UID to user name

  - by Mike

  I'm looking for a way of mapping a uid (unique number representing a system user) to a user name using Perl. Please don't suggest greping /etc/passwd :)

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