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• SQL Select between two fields depending on the value of one field

  - by Filip

  Hi. I am using a PostgreSQL database, and in a table representing some measurements I've two columns: measurement, and interpolated. In the first I've the observation (measurement), and b is the interpolated value depending on nearby values. Every record with an original value has also an interpolated value. However, there are a lot of records without "original" observations (NULL), hence the values are interpolated and stored in the second column. So basically there are just two cases in the database: Value Value NULL Value Of course, it is preferable to use the value from the first column if available, hence I need to build a query to select the data from the first column, and if not available (NULL), then the database returns the value from the second column for the record in question. I have no idea how to build the SQL query. Please help. Thanks.

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• Elegant way to add functionallity to previously defined functions

  - by Bastiaan

  How to combine two functions together I have a class controlling some hardware: class Heater() def set_power(self,dutycycle, period) ... def turn_on(self) ... def turn_off(self) And a class that connects to a database and handles all data logging fuctionallity for an experiment: class DataLogger() def __init__(self) # Record measurements and controls in a database def start(self,t) # Starts a new thread to aqcuire and reccord measuements every t secconds Now, in my program recipe.py I want to do something like: log = DataLogger() @DataLogger_decorator H1 = Heater() log.start(60) H1.set_power(10,100) H1.turn_on() sleep(10) H1.turn_off() etc Where all actions on H1 are recorded by the datalogger. I can change any of the classes involved, just looking for an elegant way to do this. Ideally the hardware functions remain separated from the database and DataLogger functions. And ideally the DataLogger is reusable for other controls and measurements.

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• PHP - Class Inherit problem

  - by TatMing

  I have A.php and B.php A.php <?php error_reporting(E_ALL); ini_set("display_errors",1); class myClass { function hello() { return 'hello'; } } ?> B.php <?php error_reporting(E_ALL); ini_set("display_errors",1); require_once('/A.php'); $a = new myClass(); testing(); function testing() { echo $a ->hello(); } ?> B.php inherits A.php , if i run B.php,but it show "Fatal error: Call to a member function hello() on a non-object." So the question is simple, how can i correct this ,but "$a = new myClass();" is not inside the function, since in .NET world can do this, i believe PHP also possible. And one more question is, what is the modify of function in A.php ,if i have not state private/public/protected???

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• Beginner's Question about accessing mysql using OOP

  - by user345690

  I am reading the PHP and mySQL web development book and so far been doing all the PHP and mysql using procedural. But then it talks about accessing mysql with objects. This works for me: //I define $db so can connect $query="select * FROM testing"; $result=mysqli_query($db,$query); while($row=mysqli_fetch_array($result)){ //echo the data } But when I try to do it with classes, it doesn't $query="select * FROM testing"; $result=$db->query($query); $row=$result->fetch_assoc(); Do I have to write my own class so it defines what query and fetch_assoc does? Or what?

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• After 30 seconds, update MYSQL databse

  - by Sam

  Hello everyone! I've been looking around here on SO and Googling, however I can't find anything that fits my description. What I want to do is update the database if the page has not been refreshed after 30 seconds. I want to email a person with the contents of a form {submitted by a different user} (I can do that) IF the person has NOT visited the page (I can do that) within the last 30 seconds. What I've tried to do is make the page that should be visited refresh every 30 seconds, and so I figured if I did something like after 31 seconds, edit the database (so if the refreshed page was not refreshed, the database editing would run). I'm sorry if this sounds complicated, there's probably a better way to do this, but I'm not sure how. The bigger picture is I'm trying to make a 'on-duty' sort of thing, so that if the person is not actively looking at the page, they will get emailed with whatever the contents of the form is. The page will contain a table of all the entered form results.

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• jquery find() function not working on ie. (ie 8) not tested on others

  - by Val

  I have a tiny problem: I am trying to use the find function to get data from an external page. here is the code can some one please help me why doesnt it work on ie? index.php <div id="testing">Hello Worlds</div> jquery var txt=$('<div id="Temp"></div>').hide().appendTo('body'); var t; $('#Temp').load('index.php',null,function (t){ t = $('#Temp').find('#testing').text(); alert(t); }) Please help me... it works well on fireworks and chrome result should be to alert "Hello Worlds" instead its blank.

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• MySQL not respond when overheaded

  - by Michal Gow

  I have few Drupal 6 websites on webhosting, which causes this strange problem: some tables, especially Cache and Watchdog, tend to overhead, when overhead is bigger than some amount of kB, MySQL server is refusing connection to given Drupal database or connection is broken during query execution, Optimizing table (just overheaded rows) in phpMyAdmin is putting all back to normal. But - until database is optimized, site is showing just MySQL errors, which is ugly... Where is a problem? Thank you for any hints I could pass back to the hosting admins!

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• SQL Server 2008 - Get Latest Record from Joined Table

  - by user336786

  Hello, I have a SQL Server 2008 database. This database has two tables called Customer and Order. These tables are defined as follows: Customer -------- ID, First Name, Last Name Order ----- ID, CustomerID, Date, Description I am trying to write a query that returns all of the customers in my database. If the user has placed at least one order, I want to return the information associated with the most recent order placed. Currently, I have the following: SELECT * FROM Customer c LEFT OUTER JOIN Order o ON c.[ID]=o.[CustomerID] As you can imagine, this will return all of the orders associated with a customer. In reality though, I only want the most recent one. How do I do this in SQL? Thank you!

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• Encryption By Certificate

  - by user1817240

  I am encrypting customer name in database at database level. While saving in database only first letter of customer name is saved and hence while decrypting only first letter is retrieved. The following code shows the test sp. ALTER PROCEDURE [dbo].[spc_test_insert] ( @sFIRST_NAME typ_encryptedtext, ) AS BEGIN DECLARE @sSENCRYPTION_KEY char(15) DECLARE @sCERTIFICATE char(22) SET @sSENCRYPTION_KEY='SymmetricKey1' SET @sCERTIFICATE='CustomerCertificate' OPEN SYMMETRIC KEY SymmetricKey1 DECRYPTION BY CERTIFICATE CustomerCertificate; INSERT INTO test_table ( FIRST_NAME, ) Values ( -- Add the Params to be Added... EncryptByKey(Key_GUID(@sSENCRYPTION_KEY),@sFIRST_NAME), ) CLOSE SYMMETRIC KEY SymmetricKey1 END encryption decryption working fine in normal insert but its not working in stored procedure.

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• Problem using OLEDBCOMMANDBUILDER.

  - by Lullly

  So, here it goes: I need to copy data from table in access database, in another table from another access database. Column names from tables are the same, except the fact that the FROM table has 5 columns, the TO table has 6. here is my code: dsFrom.Clear() dsTO.Clear() daFrom = Nothing daTO = Nothing conn_string1 = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source="etc.mdb;" conn_string2 = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source="database.mdb;" query1 = "Select * from nomenclator_produse" query2 = "Select * from nomenclator_produse" Conn1 = New OleDbConnection(conn_string1) conn2 = New OleDbConnection(conn_string2) Conn1.Open() conn2.Open() daFrom = New OleDbDataAdapter(query1, Conn1) daTO = New OleDbDataAdapter(query2, conn2) daFrom.AcceptChangesDuringFill = False dsFrom.HasChanges() daFrom.Fill(dsFrom, "nomenclator_Produse") dsFrom.HasChanges() Dim cb = New OleDbCommandBuilder(daFrom) dsTO = dsFrom.Copy daTO.UpdateCommand = cb.GetUpdateCommand daTO.InsertCommand = cb.GetInsertCommand daTO.Update(dsTO, "nomenclator_produse") Because the FROM table has 5 rows and the other has 6, i'm trying to use the InsertCommand generated by the DataAdapter of the first table. It works, only that it inserts the data from the FROMTABLE in the same FROMTABLE, instead of TOTABLE. :| please help me :(

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• ' \r ' vs ' \n ' in C

  - by MCP

  I'm writing a function that basically waits for the user to hit "enter" and then does something. What I've found that works when testing is the below: #include <stdio.h> int main() { int x = getc(stdin); if (x == '\n') { printf("carriage return"); printf("\n"); } else { printf("missed it"); printf("\n"); } } The question I have, and what I tried at first was to do: "if (x == '\r')" but in testing, the program didn't catch me hitting enter. The '\n' seems to correspond to me hitting enter from the console. Can someone explain the difference? Also, to verify, writing it as "if... == "\n"" would mean the character string literal? Ie the user would literally have to enter "\n" from the console, correct? Thanks!

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• Setting cookie for site in http and https under different subdomains in PHP

  - by nilacqua

  Situation: 1. I'm trying run an https store(xcart) under one domain secure.mydomain and I want to have access to a cookie it sets in http www.mydomain 2. I'm Running PHP on apache(MAMP), testing in firefox with firecookie 3. The existing code sets cookies to .secure.mydomain. I'm not sure if this is xcart related, but setcookie is actually called using secure.mydomain. I'm not sure why the "." is appended. Problems: 1. When I try to use setcookie in https to use the domain .mydomain or just mydomain, no cookie is created, whether I'm running the store under http or https. The testing code I'm using is: setcookie('three', 'two', 0, "/", ".mydomain"); If I set the cookie to secure.mydomain or .secure.mydomain it does show up. Is there a reason the cookie isn't showing up?

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• Avoiding memory full -> swap full -> crash

  - by Noam

  I'm experiencing an issue when sometimes the memory gets 100% full, and the swap file also, and the server becomes non-responsive and has to be restarted (causing also problems in database). This is what Cacti shows: The server is running a web-app (database + apache) and during that specific moment didn't experience any ir-regular traffic or usage. This scenario happened twice in the last week. What can cause this? How can I resolve the issue?

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• MySQL returns fewer rows with GROUP BY statement

  - by bschaeffer

  I've got a MySQL database that stores image information. Right now it only has three rows stored in the database, and each row is associated with something like, for instance, a unique blog post via a key column. As of right now, one "blog post key" has one image, and one has two images in the database. When I run this query, MySQL returns all three rows. SELECT `id`, `key`, `url` FROM (`images`) WHERE `key` = 'TpaS4G5h' OR `key` = '78855e44' However, when i add the GROUP BY statement I only get two rows... one for each key. SELECT `id`, `key`, `url` FROM (`images`) WHERE `key` = 'TpaS4G5h' OR `key` = '78855e44' GROUP BY `key` I'm sure there is a simple solution, but I don't know what it is... so any help would be really appreciated. Thanks in advance!

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• How can I store and access SQLite databases from a central location?

  - by Brian Ramsay

  I have installed SQLite on my UNIX system, and am planning on accessing it from PHP. However, the database is created in the directory I initialize it in, and if a script runs in a different directory a new database is created in the same directory. Is there an option for SQLite (or the PHP wrappers) to create the databases in one location, and have those databases accessible just by name outside of that directory? Ideally, I'd like to be able to do something like $db=new SQLiteDatabase("db.test"); in any directory and have it reference the same database, if that makes sense.

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• How to log the raw SQL from Oracle occi C++ api?

  - by savanna

  One of our customers is complaining our application is not working. Their reasoning is that our sql function call to their Oracle database is not getting the "expected" result. Sometime, it should failed but our application get success from their database. It's really frustrating because it's their database and we cannot do any test on it. We are using the C++ Oracle OCCI API. Is there anyway we can log the raw sql from our end? That will be very helpful and we can ship the script to them and let them debug in their system to figure out the problem. Thanks in advance.

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• Hibernate + Spring + session + cache

  - by andromeda

  We are using Hibernate with Spring for our Java application. We find out that when a session update something in database other sessions can not see the update. For example user1 get the account balance from database then user2 increase the balance , if user1 get the object another time he see the account balance before updating (seems that session use the value from its cache) but we want to get the updated object with new account balance. User1 use one session during all activity that is different from user2 session. Is any configuration to force to get the updated object from database? or any other help?

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• how do I get the SDK version for an app running on the simulator programmatically?

  - by newbiez

  I am trying to get the version/build that is running on the simulator via code. Basically I am checking various features of my app using the simulator, and want to switch code paths on and off based on which SDK do I have set as current, instead than doing it by hand every time (my testing machine has different version of the SDK on it and I switch the current for testing purposes between 4.1 and 5.1). So the idea is that when the app launch on the simulator, I can read the build of the SDK and know trough matching (I have a function that does the matching and turn on and off the features) if I should run a specific code path or not. I know how to figure out if I am running on the sim or on a device, but cannot find references about how to get the version of the SDK via code, so I am basically stuck. Is there any function that I can call and that returns me the build or version of the currently installed iOS, while I am running the app on the simulator?

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• Advice regarding Java frameworks [closed]

  - by Mixiul

  I am in the process of creating a website/phone application using JQuery Mobile and PhoneGap. I am hoping to add openID support so users can login in with pre-existing accounts. It will be necessary for me to have a database with a few tables to enable me to implement all the core functionality I desire. I haven't really had much experience with frameworks before, the closest thing I have done to this is create a basic website using php that connected to a MySql database stored on the machine that hosted the apache webserver. The interaction with the database won't be complex. I am required to use a java framework for the backend of my application. My question is which java framework is most suitable (flexible and straight forward to learn)? Any advice you guys can provide is greatly appreciated. Thanks

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• Value of variable changing before function is finished running

  - by Patrick

  I have an image uploading script in which i use the following setup to assign names to uploaded images; $saltdate = date( 'U' ); $saltuser = $_SERVER[REMOTE_ADDR]; $saltname = md5($saltdate.$saltuser); // Recieve, Process, Save uploaded image // Update database with image name The problem that i encounter is that after processing/saving the image, when its time to add this file name to the database, the value of $saltdate seems to have changed and i will get a file name in the database that doesnt exist. How can i make sure that the value doesn't change once i establish it?

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• How do I call Informix stored procedures from Perl?

  - by superjtc

  How do I call informix stored procedures from Perl? I use DBD::ODBC to connect to informix database, but I don't know how to call procedures. my code like this: my $dbh=DBI->connect("dbi:".DBDRIVE.":".DBNAME,DBUSER,DBPASS,{RaiseError=>0,PrintError=>0,AutoCommit=>1}) ||die $DBI::errstr; $dbh->do("execute procedure sp_test('2010-05-01 00:00:00')") || warn "failed\n"; $dbh->disconnect(); when I run it, it didn't get error. But I get nothing when I check the database. the store procedure works fine if I run it in database directly. Anyone can help me out?

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• Creating new Entities from Stored Procedure

  - by SK

  I have a stored procedure that retrieves existing rows from a table and also creates includes new rows that match the table definition and mapped entity (.net 3.5 entity framework). These new rows are not written to the database in the stored procedure. The stored procedure executes, but the new rows that were created will not load the navigation properties sucessfully i.e. the rows that do not actually exist in the database. e.g. database rows: key, data, FK 1, xxx, a 2, xxx, b returned rows from stored procedure: key, data, FK 1, xxx, a 2, xxx, b 3, yyy, a 4, yyy, b The entity will load FK entities a and b for rows 1 and 2, but for rows 3 and 4 the FK entity is null. Do I somehow need to add the new rows to the data context? or turn off tracking?

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• In the context of an asp.net website, what's the most efficient way to check whether a User has acce

  - by scaramouch

  I have a webpage that you pass in an id parameter (via a querystring), which it then uses to fetch data from a database. Typically, a user would navigate to this page from another page that lists only those records that the user has access to. However, if they go directly to the page by typing in the URL in the Address Bar, they can effectively view any record they like. Eg. If they were to type something like http://localhost/TestSite/ClientAdmin/ManageLocation.aspx?LocationID=5 into their Address Bar, they can access the database record with the LocationID equal to five - even though they shouldn't have access to it. Now, I could solve this by doing a database check every time the page is loaded to see whether the current user has access to the record they're trying to view. However this doesn't seem very efficient given that in most cases a user won't be trying to access a record that isn't theirs. Does anyone have a better suggestion? Thanks.

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• Design cache mechanism

  - by Delashmate

  Hi All, I got assignment to write design for cache mechanism, This is my first time writing a design document, Our program display images for doctors, and we wan't to reduce the parsing time of the images So we want to save the parsed data in advance (in files or inside database) Currently I have several design key ideas Handle locks - each shared data structure should be handled, also files Test - add test to verify the data from the cache is equal to the data from the files To decouple the connection to the database- not to call directly to the database Cleanup mechanisem- to delete old files if the cahce directory exceed configurable threshold Support config file Support performance tool in the feature I will also add class diagram, data flow charts, and workflow What do you think I should add to the key ideas? Do you know good link to atricales about design? Thanks in advance, Dan

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• Beginners PHP / mySQL question

  - by Reg H

  I'm brand new to PHP & MySQL, and one function I'm creating needs to access a large table or database. I've created the database and it's currently in a MySQL table, which I'm accessing with no problem. The table is 11,000 rows in length, with 8 columns (all text less than 8 characters long) - it's static, and will never change. Without getting too particular, my users will hit a button which will trigger scripts to access the data, say 500 times or more. So in general would it be better practice to include all of this data in a big 'switch' or 'if... then' conditional right in my scripts, rather than opening and accessing the database connection hundreds, or maybe even thousands of times? It just seems like that might be a bottleneck waiting to happen. Thanks!

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