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• mySQL & Relational databases: How to handle sharding/splitting on application level?

  - by Industrial

  Hi everybody, I have thought a bit about sharding tables, since partitioning cannot be done with foreign keys in a mySQL table. Maybe there's an option to switch to a different relational database that features both, but I don't see that as an option right now. So, the sharding idea seems like a pretty decent thing. But, what's a good approach to do this on a application level? I am guessing that a take-off point would be to prefix tables with a max value for the primary key in each table. Something like products_4000000 , products_8000000 and products_12000000. Then the application would have to check with a simple if-statement the size of the id (PK) that will be requested is smaller then four, eight or twelve million before doing any actual database calls. So, is this a step in the right direction or are we doing something really stupid?

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• Using 'Copy as cURL' from Chrome in windows command line

  - by user2029890

  So, Google Chrome as this great 'copy as cURL' option under 'Network' of the Chrome DevTools. Works great in command lines for linux but not in windows. Apparently it has something to do with the single quotes as the error I get is protocol 'http not supported In other words its reading that single quote. Is there a simple way to make this formatable for windows? I tried replacing all the single quotes with double quotes but then nothing happens at all. The command is: curl 'http://www.test.com/login/' -H 'Cookie: PHPSESSID=7dvb25maaaaaa9d7bbbbbc3f6' -H 'Origin: http://www.test.com' -H 'Accept-Encoding: gzip,deflate,sdch' -H 'Host: www.test.com' -H 'Accept-Language: en-US,en;q=0.8' -H 'User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/28.0.1500.95 Safari/537.36' -H 'Content-Type: application/x-www-form-urlencoded' -H 'Accept: text/html,application/xhtml+xml,application/xml;q=0.9,/;q=0.8' -H 'Cache-Control: max-age=0' -H 'Referer: http://www.test.com/login/' -H 'Connection: keep-alive' --data 'loc=&login=user%40test.com&password=password&submit1=Sign+In' --compressed Thank you

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• Barcode field length

  - by bestattendance

  I'm writing some attendance software. Each member will have an ID card with a barcode which they will use to sign in to events. How long should the barcode field be in my database? I'd like to accept Code 39 and Code 128 barcodes. I know these are variable length codes, so what should I set the max length to? Thanks! EDIT: My clients will be using a variety of third-party barcode printing tools.

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• RODBC string getting truncated

  - by sayan dasgupta

  Hi all, I am fetching data from MySql Server into R using RODBC. So in one column of the database is a character vector SELECT MAX(CHAR_LENGTH(column)) FROM reqtable; RETURNS 26566 Now I will show you an example how I am running into the problem `library(RODBC) con <- odbcConnect("mysqlcon") rslts <- as.numeric(sqlQuery(con, "SELECT CHAR_LENGTH(column) FROM reqtable LIMIT 10", as.is=TRUE)[,1]) ` returns > rslts [1] 62 31 17 103 30 741 28 73 25 357 where as rslts <- nchar(as.character(sqlQuery(con, "SELECT column FROM reqtable LIMIT 10", as.is=TRUE)[,1])) returns > rslts [1] 62 31 17 103 30 255 28 73 25 255 So strings with length 255 is getting truncated at 255. Is there a way I can get the full string. Thanks

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• EntityFramwork System.OutOfMemoryException on 100MB upload

  - by Win

  Upload works fine for 62MB file. However, it throws exception if it is 100MB. I found few questions in stackoverflow, but none is very specific about datatype. Appreciate your help! ASP.Net 4, IIS7, EntityFramework 4.1, Visual Studio 2010 SP1, SQL 2008 DataType is varbinary(max) applicationHost.config <section name="requestFiltering" overrideModeDefault="Allow" /> web.config <httpRuntime maxRequestLength="1148576" executionTimeout="3600"/> <security > <requestFiltering> <requestLimits maxAllowedContentLength="112400000" /> </requestFiltering> </security>

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• Math Mod Containing Numbers

  - by TheDarkIn1978

  i would like to write a simple line of code, without resorting to if statements, that would evaluate whether a number is within a certain range. i can evaluate from 0 - Max by using the modulus. 30 % 90 = 30 //great however, if the test number is greater than the maximum, using modulus will simply start it at 0 for the remaining, where as i would like to limit it to the maximum if it's past the maximum 94 % 90 = 4 //i would like answer to be 90 it becomes even more complicated, to me anyway, if i introduce a minimum for the range. for example: minimum = 10 maximum = 90 therefore, any number i evaluate should be either within range, or the minimum value if it's below range and the maximum value if it's above range -76 should be 10 2 should be 10 30 should be 30 89 should be 89 98 should be 90 23553 should be 90 is it possible to evaluate this with one line of code without using if statements?

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• Referencing outer query's tables in a subquery

  - by soulmerge

  Is it possible to reference an outer query in a subquery with MySQL? I know there are some cases where this is possible: SELECT * FROM table t1 WHERE t1.date = ( SELECT MAX(date) FROM table t2 WHERE t2.id = t1.id)` ); But I'm wondering if something like this could work: SELECT u.username, c._postCount FROM User u INNER JOIN ( SELECT p.user, COUNT(*) AS _postCount FROM Posting p --# This is the reference I would need: WHERE p.user = u.id ) c ON c.user = u.id WHERE u.joinDate < '2009-10-10'; I know I could achieve the same using a GROUP BY or by pulling the outer WHERE clause into the sub-query, but I need this for automatic SQL generation and cannot use either alternative for various other reasons.

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• SQL Stored Procedure

  - by Nathan

  I am trying to run a stored procedure with a while loop in it using Aqua Data Studio 6.5 and as soon as the SP starts Aqua Data starts consuming an increasing amount of my CPU's memory which makes absolutely no sense to me because everything should be off on the Sybase server I am working with. I have commented out and tested every piece of the SP and narrowed the issue down to the while loop. Can anyone explain to me what is going on? create procedure sp_check_stuff as begin declare @counter numeric (9), @max_id numeric (9), @exists numeric (1), @rows numeric (1) select @max_id = max(id) from my_table set @counter = 0 set @exists = 0 set @rows = 0 while @count <= @max_id begin //More logic which doesn't affect memory usage based //on commenting it out and running the SP set @counter = @counter + 1 set @exists = 0 set @rows = 0 end end return

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• Why I can't use template table in dynamic query SQL SERVER 2005

  - by StuffHappens

  Hello! I have the following t-sql code which generates an error Declare @table TABLE ( ID1 int, ID2 int ) INSERT INTO @table values(1, 1); INSERT INTO @table values(2, 2); INSERT INTO @table values(3, 3); DECLARE @field varchar(50); SET @field = 'ID1' DECLARE @query varchar(MAX); SET @query = 'SELECT * FROM @table WHERE ' + @field + ' = 1' EXEC (@query) The error is Must declare the table variable "@table". What's wrong with the query. How to fix it?

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• How do I add a Marker to a jQuery UI Slider?

  - by Bijan

  I have a simple jQuery UI slider that has a numerical range from 25 to 35. It works fine and the default value is 28. I'm hoping to add a simple tick mark to the slider to indicate that 28 is where the default is. Is there a simple way to add an indicator? $('#cycle_length').slider({ range: "min", value: 28, min: 25, max: 35, step: 1, slide: function( event, ui ) { $( "#amount" ).val( ui.value ); } }); $( "#amount" ).val( $( "#cycle_length" ).slider( "value" ) );

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• jquery - setting a limit of items, that can be dragged into a list

  - by maschek

  Hi, i have this two lists, from which i can move items from one to another with jquery ui and connect lists, with ajax. If an item is pulled over, a message is generated in a php file and then it appears on screen. Now i want that for example the right list should be allowed to contain ten items at max. It would be great if it would be possible with jquery, that if there is already ten items in the list and you go and drag the eleventh, if then the item would somehow vanish, maybe with a little effekt. I think maybe reading out db in the php-file if theres already ten items, and so on. But i have currently no idea, if and in case if in which way, jquery would support this kind of behaviour. Can you give me some advise? Greetings, maschek

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• windows fails to allocate the amount of free physical memory returned by GlobalMemoryStatusEx

  - by avi

  hello! what i'm trying to do is get the free amount of physical memory allocate it and than manage it ( resizing it or delete it ) depending on what further calls to GlobalMemoryStatusEx return. and the problem : it works on 2 PCs with win 7 x64 one with 2G Ram ( on witch i was able to allocate like 1.3 GB) , the other has one 1GB RAM (max alloc was 630 MB). it fails on the third one with 3GB of ramm. I can't find the problem. !! i tried google!! any solution?

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• Dynamic validation in jquery

  - by mansoor

  $(document).ready(function(){ $('a[rel=addhint]').click(function(){ var html='<div><label>Hint</label>'; html+='<span class="input"><input type="text" size="30" class="text" name="hint"/><a href="#" rel="delhint">delete</a></span><br class="clear" /></div>'; $('div#hintTextContainer').append(html); bindDelHintAll(); return false; }); I want when a new text area include vadition of required field and max length will also apply on it.

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• Find recipes that can be cooked from provided ingridients

  - by skaurus

  Sorry for bad English :( Suppose i can preliminary organize recipes and ingredients data in any way. How can i effectively conduct search of recipes by user-provided ingredients, preferably sorted by max match - so, first going recipes that use maximum of provided ingridients and do not contain any other ingrs, after them recipes that uses less of provided set and still not any other ingrs, after them recipes with minimum additional requirements and so on? All i can think about is represent recipe ingridients like bitmasks, and compare required bitmask with all recipes, but it is obviously a bad way to go. And related things like Levenstein distance i don't see how to use here. I believe it should be quite common task...

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• mysql varchar innodb page size limit 8100 bytes

  - by David19801

  Hi, Regarding innodb, someone recently told me: "the varchar content beyond 768 bytes is stored in supplemental 16K pages" This is very interesting. If each varchar will be latin1, which I believe stores as 1byte per letter, would a single varchar(500) (<768 bytes) require an extra i/o as a varchar(1000) (768 bytes) would?? (this question is to find out if all varchars or just big varchars are split into a separate page) Is the 768 limit per varchar or for all varchars in the row added together? (for example, does this get optimized - varchar(300), varchar(300), varchar(300): [where each individual varchar column is below 768 but together they are above 768 characters]? I am confused about if the 768 limit relates to each individual varchar or all varchars in the row totaled (as in the question). Any clarification? EDIT: Removed part about CHARS due to finding out about their limit of 255 max.

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• Passing 2D array with variable dimensions as function argument

  - by TheCrazyProgrammer

  I just saw the following code among the successful submissions at codechef. http://www.codechef.com/viewplaintext/1595846 I used to think that float max(int n,int arr[n][n]) {....} is not allowed in C++ (as 'n' is a variable). My CodeBlocks (on windows) with MinGW [gcc 4.4] gives compile time error. that "error: array bound is not an integer constant. Then how can be such a solution be accepted by CodeChef's judge. Is there any special flag that allows us to do that in C++??? EDIT: A link showing status as AC (accepted) : http://www.codechef.com/viewsolution/1595846

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• How can I specify a dynamic height for an ImageView?

  - by kefs

  I have an ImageView at the top of my display that looks like the following: +----------------------------------------------+ ¦ ImageView +--------------+ ¦ ¦ ¦ ¦ ¦ ¦ ¦ Actual image ¦ ¦ ¦ ¦ ¦ ¦ ¦ ¦ ¦ ¦ ¦ ¦ ¦ ¦ ¦ +--------------+ ¦ +----------------------------------------------+ Below this, I have a series of Buttons and TextViews.. I would like the ImageView's height to dynamically increase depending on the max height of the screen. I'm aligning the layout containing the buttons along the bottom of edge of the screen, and I would like the rest of the screen taken up by the above ImageView. Also, since the ImageView contains a centered image, I would also like to set min height, and a scrollbar if the screen is too small to display the imageview and the buttons below. Thanks! Is this possible?

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• sql insert statement with a lot of same where clause and one different where cluase

  - by william

  I m sry if the title is not clear. Here's my proble. I created a new table which will show total, average and maximum values. I have to insert the results into that table. That table will have only 4 rows. No Appointment, Appointment Early, Appointment Late and Appointment Punctual. So.. I have sth like.. insert into newTable select 'No Appointment' as 'Col1', avg statement, total statement, max statement from orgTable where (general conditions) and (unique condition to check NO APPOINTMENT); I have to do that same thing for another 3 rows.. where only the unique condition is different to check early, punctual or late.. So..the statement is super long. I wanna reduce the size.. How can I achieve that?

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• How to convert from integer to unsigned char in C, given integers larger than 256?

  - by Alf_InPogform

  As part of my CS course I've been given some functions to use. One of these functions takes a pointer to unsigned chars to write some data to a file (I have to use this function, so I can't just make my own purpose built function that works differently BTW). I need to write an array of integers whose values can be up to 4095 using this function (that only takes unsigned chars). However am I right in thinking that an unsigned char can only have a max value of 256 because it is 1 byte long? I therefore need to use 4 unsigned chars for every integer? But casting doesn't seem to work with larger values for the integer. Does anyone have any idea how best to convert an array of integers to unsigned chars?

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• format.js response doesn't execute

  - by Denis

  Hi, I use Rails 3.0.0 Beta following an action, my rjs view returns a javascript, but the code is not executed In firebug I see in my response $('polaroids').insert("<li>\n <a title=\"4204497503_a0c43c561d.jpg\" href=\"#\">\n <img alt=\"4204497503_a0c43c561d.jpg\" src=\"/system/photos/279/original/4204497503_a0c43c561d.jpg?1268857318\" />\n <\/a>\n<\/li>") Here is the response header Response Headers Etag "7343b21b2f062fb74b7d5f32e3a83c2c" Connection Keep-Alive Content-Type text/javascript; charset=utf-8 Date Wed, 17 Mar 2010 20:21:58 GMT Server WEBrick/1.3.1 (Ruby/1.8.7/2008-08-11) X-Runtime 0.060497 Content-Length 220 Cache-Control max-age=0, private, must-revalidate Set-Cookie _photos_session=BAh7ByIQX2NzcmZfdG9rZW4iMS9OWnpOZUR6UGQ2UDhvbGt5YWpTWXhJcFR2YjRHOEhzZHlIbmdMblRlMWs9Ig9zZXNzaW9uX2lkIiUxNjlhOWYzNjQxODE2N2NjN2FiNmYzY2VkYmU3OTgwYQ%3D%3D--022d7202178b2cc7bf968e558c2ae67ecef1fb74; path=/; HttpOnly

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• converting date data type into varchar

  - by Sheetal Inani

  I have some dates fields in table. These columns contain dates in the following format: mmddyy For example: 31/12/2010 00:00:00:0000 I need to import these values into a table which is set to varchar and numeric and formats dates like this: monthName varchar Year numeric(4,0) currently I'm using INSERT INTO [School].[dbo].[TeacherAttendenceDet] ([TeacherCode], [MonthName], [Year]) (SELECT MAX(employeecode), Datename(MONTH, dateofjoining) AS MONTH, Datepart(YEAR, dateofjoining) AS DATE FROM employeedet GROUP BY dateofjoining) but datename() gives result in date format.. I have to save it in varchar format How can I do this? this is employeemast table: EmployeeCode numeric(5, 0) PayScaleCode numeric(7, 0) DesignationCode varchar(50) CityCode numeric(5, 0) EmployeeName varchar(50) FatherName varchar(50) BirthDate varchar(50) DateOfJoining varchar(50) Address varchar(150) this is TeacherAttendenceDet table TeacherCode numeric(5, 0) Unchecked Year numeric(4, 0) Unchecked MonthName varchar(12) Unchecked i have to insert in teacherattendencedet table the monthname and year from employeemast

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• Best way to handle enable/disable of UIButtons on iPhone

  - by Anonymous

  I have an increase button and a decrease button, both of which affect a variable. The variable has a minimum and the decrease button will be disabled once that minimum is reached. Likewise for the maximum value of the variable. In my controller, I have two IBActions for both the increase and decrease actions, and two IBOutlets, in order to disable the buttons accordingly. At the bottom of my KVO statement to handle the value change, I have: increaseButton.enabled = value != MAX; decreaseButton.enabled = value != MIN; While this code is functional, I can't help but feel that feel this is a naive approach to the problem, especially since this requires 4 connections. Is there a better solution to this, one that uses fewer connections?

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• Find a node in a Graph that minimizes the distance between two other nodes

  - by Andrés

  Here is the thing. I have a directed weighted graph G, with V vertices and E edges. Given two nodes in the graph, let's say A, and B, and given the weight of an edge A-B denoted as w(A, B), I need to find a node C so that max(w(A, C), w(B, C)) is minimal among all possibilities. By possibilities I mean all the values C can take. I don't know if it is completely clear, if it's not, I'll try to be more precise. Thanks in advance.

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• Nested loop with dependent bounds trip count

  - by aaa

  hello. just out of curiosity I tried to do the following, which turned out to be not so obvious to me; Suppose I have nested loops with runtime bounds, for example: t = 0 // trip count for l in 0:N for k in 0:N for j in max(l,k):N for i in k:j+1 t += 1 t is loop trip count is there a general algorithm/way (better than N^4 obviously) to calculate loop trip count? I am working on the assumption that the iteration bounds depend only on constant or previous loop variables.

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• Postgresql sequences

  - by Dylan

  When I delete all records from a Postgresql table and then try to reset the sequence to start a new record with number 1 when it is inserted, i get different results : SELECT setval('tblname_id_seq', (SELECT COALESCE(MAX(id),1) FROM tblname)); This sets the current value of the sequence to 1, but the NEXT record (actually the first because there are no records yet) gets number 2! And I can't set it to 0, because the minimum value in the sequence is 1! When I use : ALTER SEQUENCE tblname_id_seq RESTART WITH 1; the first record that is inserted actually gets number 1 ! But the above code doesn't accept a SELECT as a value instead of 1. I wish to reset the sequence to number 1 when there are no records, and the first record then should start with 1. But when there ARE already records in the table, I want to reset the sequence so that the next record that is inserted will get {highest}+1 Does anyone have a clear solution for this?

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