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  • How can I design my classes to include calendar events stored in a database?

    - by Gianluca78
    I'm developing a web calendar in php (using Symfony2) inspired by iCal for a project of mine. At this moment, I have two classes: a class "Calendar" and a class "CalendarCell". Here you are the two classes properties and method declarations. class Calendar { private $month; private $monthName; private $year; private $calendarCellList = array(); private $translator; public function __construct($month, $year, $translator) {} public function getCalendarCellList() {} public function getMonth() {} public function getMonthName() {} public function getNextMonth() {} public function getNextYear() {} public function getPreviousMonth() {} public function getPreviousYear() {} public function getYear() {} private function calculateDaysPreviousMonth() {} private function calculateNumericDayOfTheFirstDayOfTheWeek() {} private function isCurrentDay(\DateTime $dateTime) {} private function isDifferentMonth(\DateTime $dateTime) {} } class CalendarCell { private $day; private $month; private $dayNameAbbreviation; private $numericDayOfTheWeek; private $isCurrentDay; private $isDifferentMonth; private $translator; public function __construct(array $parameters) {} public function getDay() {} public function getMonth() {} public function getDayNameAbbreviation() {} public function isCurrentDay() {} public function isDifferentMonth() {} } Each calendar day can includes many calendar events (such as appointments or schedules) stored in a database. My question is: which is the best way to manage these calendar events in my classes? I think to add a eventList property in CalendarCell and populate it with an array of CalendarEvent objects fetched by the database. This kind of solution doesn't allow other coders to reuse the classes without db (because I should inject at least a repository services also) just to create and visualize a calendar... so maybe it could be better to extend CalendarCell (for instance in CalendarCellEvent) and add the database features? I feel like I'm missing some crucial design pattern! Any suggestion will be very appreciated!

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  • How can I design my classes for a calendar based on database events?

    - by Gianluca78
    I'm developing a web calendar in php (using Symfony2) inspired by iCal for a project of mine. At this moment, I have two classes: a class "Calendar" and a class "CalendarCell". Here you are the two classes properties and method declarations. class Calendar { private $month; private $monthName; private $year; private $calendarCellList = array(); private $translator; public function __construct($month, $year, $translator) {} public function getCalendarCells() {} public function getMonth() {} public function getMonthName() {} public function getNextMonth() {} public function getNextYear() {} public function getPreviousMonth() {} public function getPreviousYear() {} public function getYear() {} private function calculateDaysPreviousMonth() {} private function calculateNumericDayOfTheFirstDayOfTheWeek() {} private function isCurrentDay(\DateTime $dateTime) {} private function isDifferentMonth(\DateTime $dateTime) {} } class CalendarCell { private $day; private $month; private $dayNameAbbreviation; private $numericDayOfTheWeek; private $isCurrentDay; private $isDifferentMonth; private $translator; public function __construct(array $parameters) {} public function getDay() {} public function getMonth() {} public function getDayNameAbbreviation() {} public function isCurrentDay() {} public function isDifferentMonth() {} } Each calendar day can includes many events stored in a database. My question is: which is the best way to manage these events in my classes? I think to add a eventList property in CalendarCell and populate it with an array of CalendarEvent objects fetched by the database. This kind of solution doesn't allow other coders to reuse the classes without db (because I should inject at least a repository services also) just to create and visualize a calendar... so maybe it could be better to extend CalendarCell (for instance in CalendarCellEvent) and add the database features? I feel like I'm missing some crucial design pattern! Any suggestion will be very appreciated!

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  • PHP Code (modules) included via MySQL database, good idea?

    - by ionFish
    The main script includes "modules" which add functionality to it. Each module is set up like this: <?php //data collection stuff //(...) approx 80 lines of code //end data collection $var1 = 'some data'; $var2 = 'more data'; $var3 = 'other data'; ?> Each module has the same exact variables, just the data collection is different. I was wondering if it's a reasonable idea to store the module data in MySQL like this: [database] |_modules |_name |_function (the raw PHP data from above) |_description |_author |_update-url |_version |_enabled ...and then include the PHP-data from the database and execute it? Something like, a tab-navigation system at the top of the page for each module name, then inside each of those tabs the page content would function by parsing the database-stored code of the module from the function section. The purpose would be to save code space (fewer lines), allow for easy updates, and include/exclude modules based on the enabled option. This is how many other web-apps work, some of my own too. But never had I thought about this so deeply. Are there any drawbacks or security risks to this?

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  • Pay online service

    - by Samuel
    Hellow, I have a database where you can select articles etc, users have an account, it's all in mysql and php (i guess you don't need that code). What i was wondering was how to write a script that allows users to pay online for the articles they selected? It doesn't need to be any code, just ideas / hints / tips / ... (that are doable in PHP or something similar) Thanks in advance!! -Samuel

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  • "Create table if not exists" - how to check the schema, too?

    - by Joonas Pulakka
    Is there a (more or less) standard way to check not only whether a table named mytable exists, but also whether its schema is similar to what it should be? I'm experimenting with H2 database, and CREATE TABLE IF NOT EXISTS mytable (....) statements apparently only check for the table´s name. I would expect to get an exception if there's a table with the given name, but different schema.

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  • SQLCODE -1390 connecting to DB2 64 bit client from 32 bit app

    - by Oliver Abraham
    Hi there, I've got a 32 bit application that connects normally to a DB2 database. (written in C) When I run it on a machine with a DB2 64 bit client, I get a SQLCODE -1390 from connect. (Win7 64 Bit, DB2 V9.7 client 64 bit) Connecting from the command line works (db2 connect to ...) With a 32 Bit DB2 client on the same Win7 64 Bit machine, the connect also works. Does anyone has an idea how to fix it ? Best regards Oliver

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  • How do I drop SQL Databases? sp_delete_database_backuphistory woes

    - by rlb.usa
    I want to delete some SQL Databases on my server, but I'm having problems. My login has the roles: public dbcreator serveradmin When I right click the database and hit Delete, it says that Delete backup history failed for server 'MYSERVER' (Microsoft.SqlServer.Smo) Additional Information: The EXECUTE permission was denied on the object 'sp_delete_database_backuphistory' How do I delete these databases?

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  • Oracle TNS names not showing when adding new connection to sqldeveloper

    - by Americus
    Hello, I'm trying to connect to an oracle database with sqldeveloper. I've installed the .Net oracle drivers and placed the tnsnames.ora file at C:\Oracle\product\11.1.0\client_1\Network\Admin. I'm using the following format in tnsnames.ora. dev = (DESCRIPTION = (ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.XXX.XXX)(PORT = XXXX)) (CONNECT_DATA = (SERVER = DEDICATED) (SERVICE_NAME = idpdev2) ) ) In sqldeveloper, when I try to create a new connection, no tns names show up as options. Is there something I'm missing?

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  • Many-to-many relations in RDBMS databases

    - by Industrial
    What is the best way of handling many-to-many relations in a RDBMS database like mySQL? Have tried using a pivot table to keep track of the relationships, but it leads to either one of the following: Normalization gets left behind Columns that is empty or null What approach have you taken in order to support many-to-many relationships?

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  • Star Schema vs Snowflake Schema performance

    - by Megawolt
    Hi... I'm begin to developing a scial sharing website so I'm curious about database design Schema... So in Data-Mining Star-Schema is the best one but how about a social sharing website... And as a nature of the SS websites there will be (i hope :)) many users in same time... Which better for performance for overdose using...

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  • What’s the strategy to recover data during DAO unit test?

    - by Michael Lu
    When I test DAO module in JUnit, an obvious problem is: how to recover testing data in database? For instance, a record should be deleted in both test methods testA() and testB(), that means precondition of both test methods need an existing record to be deleted. Then my strategy is inserting the record in setUp() method to recover data. What’s your better solution? Or your practical idea in such case? Thanks

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  • Using Amazon's EBS for MySQL hot backup

    - by flybywire
    What are your experiences using Amazons EBS snapshot features for MySql hot backups. I have a database running a batch processing job in ec2. I backup with EBS snapshot. So far the backups looks consistent. But I am afraid they "will stop being consistent as soon as I stop checking" (Uncertainty principle). What are your experiences with backuping relational databases (and mysql in particular) with ebs snapshot?

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  • Access Error when running windows program

    - by JPJedi
    I have a windows form application that uses microsoft access for the database on the backend. When I run that application I get an error that says access is not installed on the computer. I thought that if I included the reference that it will be included with what I release so the user would not have to have access installed. How do I include the Access Runtime to be distributed/installed when my application is installed?

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  • Class Map Generator for Fluent NHibernate

    - by Farzad
    Is there a Class Map generator for Fluent NHibernate? I need something like db2hbm but I want it to generate Fluent Class Maps instead of xml mappings. I am aware of AutoMapping for Fluent but that is not what I want. I want to be able to generate Class Map files from tables in database and push them to my src repository.

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  • select multiple columns using linq and sum them up

    - by Yustme
    Hi, How can i select multiple columns and calculate the total amount. For example, in my database i got a few fields which are named: 5hunderedBills, 2hunderedBills, 1hunderedBills, etc. And the value of those fields are for example: 5, 2, 3 And the sum would be: 5hunderedBills * 5 + 2hunderedBills * 2 + 1hunderedBills * 3 How can i do that with LINQ in one select statement?

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  • Creating thousands of records in Rails

    - by willCosgrove
    Let me set the stage: My application deals with gift cards. When we create cards they have to have a unique string that the user can use to redeem it with. So when someone orders our gift cards, like a retailer, we need to make a lot of new card objects and store them in the DB. With that in mind, I'm trying to see how quickly I can have my application generate 100,000 Cards. Database expert, I am not, so I need someone to explain this little phenomena: When I create 1000 Cards, it takes 5 seconds. When I create 100,000 cards it should take 500 seconds right? Now I know what you're wanting to see, the card creation method I'm using, because the first assumption would be that it's getting slower because it's checking the uniqueness of a bunch of cards, more as it goes along. But I can show you my rake task desc "Creates cards for a retailer" task :order_cards, [:number_of_cards, :value, :retailer_name] => :environment do |t, args| t = Time.now puts "Searching for retailer" @retailer = Retailer.find_by_name(args[:retailer_name]) puts "Retailer found" puts "Generating codes" value = args[:value].to_i number_of_cards = args[:number_of_cards].to_i codes = [] top_off_codes(codes, number_of_cards) while codes != codes.uniq codes.uniq! top_off_codes(codes, number_of_cards) end stored_codes = Card.all.collect do |c| c.code end while codes != (codes - stored_codes) codes -= stored_codes top_off_codes(codes, number_of_cards) end puts "Codes are unique and generated" puts "Creating bundle" @bundle = @retailer.bundles.create!(:value => value) puts "Bundle created" puts "Creating cards" @bundle.transaction do codes.each do |code| @bundle.cards.create!(:code => code) end end puts "Cards generated in #{Time.now - t}s" end def top_off_codes(codes, intended_number) (intended_number - codes.size).times do codes << ReadableRandom.get(CODE_LENGTH) end end I'm using a gem called readable_random for the unique code. So if you read through all of that code, you'll see that it does all of it's uniqueness testing before it ever starts creating cards. It also writes status updates to the screen while it's running, and it always sits for a while at creating. Meanwhile it flies through the uniqueness tests. So my question to the stackoverflow community is: Why is my database slowing down as I add more cards? Why is this not a linear function in regards to time per card? I'm sure the answer is simple and I'm just a moron who knows nothing about data storage. And if anyone has any suggestions, how would you optimize this method, and how fast do you think you could get it to create 100,000 cards? (When I plotted out my times on a graph and did a quick curve fit to get my line formula, I calculated how long it would take to create 100,000 cards with my current code and it says 5.5 hours. That maybe completely wrong, I'm not sure. But if it stays on the line I curve fitted, it would be right around there.)

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  • SQL using with clause not working

    - by user1290467
    My question is why this query does not work? Cursor c = db.rawQuery("SELECT * FROM tbl_staff WHERE PMajor = '%" + spin.getSelectedItem().toString() + "%'", null); Cursor c: it is a cursor for handling my query tbl_staff: my table that consist of PName,PMajor,PCert spin: is spinner that has values which I need for my database query. When I use: if (c.moveToNext()) else (log.d("error query","couldn't do the query!");) It goes to else statement and moveToNext() doesn't work.

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  • how to evaluate query by DMBS?

    - by Kevinniceguy
    How do we evaluate the below database query by DBMS? the query is something like : SELECT SUM(price) FROM Room r, Hotel h WHERE r.hotelNo = h.hotelNo and hotelName = 'Paris Hilton' and roomNo NOT IN (SELECT roomNo FROM Booking b, Hotel h WHERE (dateFrom <= CURRENT_DATE AND dateTo = CURRENT_DATE) AND b.hotelNo = h.hotelNo AND hotelName = 'Paris Hilton');

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