A database is any organized collection of data organized to provide efficient retrieval.

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Rails create create default database records

In my application I have an accounts model: class Account < ActiveRecord::Base belongs_to :user has_many :invoices end The ...
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55 views

Simple singleton database connection pool

I'm studying design patterns, and to demonstrate a singleton, I've implemented a primitive database connection pool. ConnectionPool.java ...
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41 views

Fantasy league tracker for Game of Thrones

So I've just started learning about MySQL and PHP to create a fantasy league tracker for Game of Thrones for my office. I got it to technically work fine, but I think it's way clunkier than it has to ...
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65 views

Web API with IoC and database integration tests [closed]

I've made integration tests for a major part of my application. I test my dependency injection is set up correctly, creating controllers with it's dependencies going all the way to the database (using ...
2
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1answer
104 views

Loading data from a text file into the database as fast as possible

I'm building a Django (1.8.12) application that parses a .bc3 file (Standard Interchange Format for Databases of Construction and Real State) and loads all the data into the database (PostgreSQL ...
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43 views

First time using entity framework with simple repository

I'm working on updating a GitHub project that I use at work, but I think the person abandoned the project as there is a pull request for it since 2014. At work we use a Repository pattern with ...
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2answers
100 views

Check existence of a row then update a column

not too experienced with SQL, wondering if I can make this better... I am trying to check if a row exists and then add one to the frequency column if it does, if it does not exist it should return ...
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30 views

Calculate normal forms in a database

Here I calculate normal forms. To begin, I check if there something on the right side of my dependencies; if so, I save it. Then I create a powerset of all possible keys and delete those which do no ...
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78 views

Query Builder for Mysql Extension

source : https://github.com/Zakisu/QB_Mysql/blob/master/mysql/Mysql.php please review mycode read the docs about the usage ...
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5answers
3k views

Event scheduler in C

One of my university assignments asked us to create a program using struct in order to create a simple event scheduler. This program is for a single day only, not ...
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1answer
41 views

Fetch data from multiple tables

I have three primary tables: Customer Product Order Relations: Many to many between product and order. ...
3
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1answer
92 views

Returning an IEnumerable using Linq-to-SQL which is then bound to a GridView

This function works, but it's really really slow and the generated SQL is gargantuan and horrible to look at. It's also very expensive to run when it shouldn't be. ...
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49 views

Seeding a database

I'm seeding my database with really complex code as I think. It works but is not good. Constrains: Every meal has exactly ONE main dish (marked as is_main in ...
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2answers
166 views

Saving and Loading data with SQLite

I'm in the process of learning SQLite in C# and I've come up with some generic methods for finding and updating data. I would appreciate any pointers with the design of my methods and/or my SQL ...
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2answers
639 views

Simple customer program in C (using binary files)

I have just finished a simple C program which is basicaly composed of 3 functions: accadd(void){} which adds some customer details to a binary file ...
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1answer
33 views

Database trigger to monitor insert/update events and update another table

I am working on a MSSQL Database (for a program called Sage 200). There are many tables in the database, however, I want to be notified of changes (new record inserted or existing record updated) via ...
4
votes
1answer
41 views

PDO connector class

I have created a DB connector class with PDO. Do I need to add, delete or edit anything in this code? ...
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0answers
37 views

Locate enteries to the nearest date selected

This code loops through a given range of dates and for every 5 minute iteration pulls up the last known records of the users in the database relative to that timestamp. I'm trying to find a way to ...
3
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1answer
57 views

Updates list in haskell to remove duplication

The task in question allows a user to re-rate a film such that only the latest rating from the user should remain in the database. Initially I solved this problem in a very basic manor? This was my ...
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5answers
3k views

Performance of a Foreach inside a Foreach iterating through a million records

I have two DataTables: dt: is populated from a CSV file with over 1.7 million rows dataStructure.Tables["AccountData"]: is ...
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3answers
57 views

Perl DBI insert of hash

How can this method that inserts a hashref into a database table be improved? It assumes that the columns of the database table are named identically to the fields in the hashref. The return value ...
3
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1answer
54 views

Simple Notification class that models database

I'm updating a website I made awhile ago from a functional design to an OOP design. There are still a lot of functions below this class that I haven't implemented yet but I'm getting to it (such as ...
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2answers
38 views

Database Connection and Query methods

I have my class DBFuntcions containing this 2 methods: The method for the connection to the database: ...
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2answers
89 views

Entity framework - code first data access

I'm looking for your opinions about ways to improve the access to data in my application. I develop web applications, using Entity Framework 6 code first, and Autofac for dependency injection. Before ...
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3answers
152 views

Make C# Unity Script database methods more re-usable and concise

I have a C# file, that makes some modifications on screen (changes the text on the user interface) but I have some doubts: How I can re-use the below methods to be more concise and reusable? How I ...
4
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3answers
125 views

Write data from database to a CSV file

I have a database containing a high amount of data. I want my app to filter and select only some of it, and save it into a CSV file or JSON. For the moment I have this method which takes the data ...
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1answer
38 views

MySQL Database Design for Easy Item Relationships and Meta Storage

I'm playing around with database designs to use for a new system. This system at its core revolves around various types of items (users, accounts, images), their meta (names, titles, file sizes), and ...
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1answer
24 views

Database schema for a products and bugs aggregator

As an exercise in learning, I'm creating a bugs/issues tracking and "aggregator" web application. A simple app consisting of products, issues, reviews and links related to it. The links will be urls ...
3
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1answer
106 views

C# class that handle MySQL db connection

I've built a class that handles all my connections to a MySql database. These are the function I use to create the connection(not really sure about the two dispose functions) : ...
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3answers
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Amanda's Relationship Tips app, with scroll performance issues

I am having some major issues with scrolling in my active app "Amanda's Relationship Tips" Under the User Advice tab: I'm using the Parse Database as a backend to pull user data. This lag is ...
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1answer
118 views

PHP/MySQL - OOP database class

I use this database class in a CMS, just a project to learn OOP. Would like to have some review on how to improve it, what should I change, add, remove? ...
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1answer
75 views

Restricting types not related through inheritance without using instanceOf by creating own class hierarchy

Restricting types not related through inheritance without using instanceOf by creating own class hierarchy. It needs to interact with a key value data store, will ...
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29 views

Calculation of duration between two timestamps in different rows

In my sample data table below, all datatypes are varchar(255). ...
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1answer
46 views

Aggregating search results from multiple databases, in smaller work units

I have a large function that performs a search over a data set given a set of parameters. This function goes through multiple databases which all hold data that would comprise one final entry from the ...
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1answer
87 views

Many CRUD operations for a list of technicians' shifts

The following code snippet is causing me a performance problem in my application. The first 5 db queries are not high time consuming, the real problem lays on the foreach loop. I considered to use ...
4
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1answer
59 views

Database Session Class

I have made the decision to move the storing of session data from the filesystem to the database. Our application is growing at pace and we are having issues with the load balancer breaking the ...
7
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3answers
167 views

Swing UI for database-to-Excel tool

I'm just wondering what is the cleanest way you can write your GUI/Swing code? Right below is the code I have for my main frame. Could you guys let me know if it looks clean/understandable, and if ...
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Implementing a long-running entity lock

Requirement I have an entity named ImportData which can be processed once in order to extract data from a file fed to the application. I need to make sure that, ...
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Go database helper code

Today I've implemented a database helper in Go. I'm new in Go world so I just wanted someone with more experience to take a look and tell me what is good and especially, what is bad (and why, if ...
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1answer
51 views

Mysql homeowner database

I'm working on a project right now. I don't have much experience in MySQL, or database design, so I was hoping someone could review what I have now. This database must be able to track multiple home ...
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0answers
24 views

Minimizing database overhead by storing additional information to the users authentication-object (Spring Security)

I am using Spring Security in order to check if a logged in user is authenticated. However, after authentication, as some actual requests come in, I would like to minimize the number of database calls ...
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2answers
59 views

“Time till” program

I have created a program which works out days, hours, minutes, seconds and milliseconds until a date which the user inputs. Is it possible to shorten/make the output a little clearer? ...
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2answers
94 views

Code First approach, feeding the table

I have a database (PostgreSQL) from which I want to migrate some data to a MS SQL Server database. I decided to use a code first approach. The question is related to the proper way of feeding my new ...
3
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1answer
62 views

Entity Framework Code First Softball Stats Database Schema

I am creating a website for my buddies and I to track all of our offensive softball stats. I am getting tired of maintaining a huge excel spreadsheet and emailing it out every week, so a website is ...
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2answers
66 views

Selecting users with biopsies in a given country for charting

I have this monstrosity ...
6
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5answers
464 views

Function to get rows from database

I have a function that returns rows from my database, and it works fine, but I was told that it was poorly written, and there is a lot of unnecessary code in it. I'm wondering if there is a simpler, ...
7
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1answer
222 views

Generic asynchronous SQLite search builder

I am writing a database manager that reads and writes to a local SQLite database on a mobile device. It works pretty well for the most part, but read access is somewhat slow - it takes about 2-5 ...
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1answer
41 views

Speeding Up JavaMail Sending

I am creating a miniature bulk email sender. I am using Postfix on Ubuntu with JavaMail. Here is the key part of the code: ...
3
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1answer
56 views

Mapping different classes to the same database table

I have several very similar subclasses that I (think I) want to be stored in the same database table. Most of the fields are identical, with each subclass adding 1 or 2 custom fields. My code is using ...
2
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0answers
74 views

Controller method to add a product, stored across three database tables

I have some questions on how I can improve this "add" action method in a controller. Using a single form, the user can upload a product to be displayed on the site. A Product is composed of three ...