MySQL is an open-source, relational database management system.

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3
votes
1answer
77 views

What is the best way to format complex SQL queries in Node?

I am using node-mysql to query a MySQL database via Express and Node. My queries are getting fairly complex and I want to format them across multiple lines. However, the only way I could accomplish ...
-4
votes
0answers
38 views

Best approach for data storage in custom web app [closed]

I'm designing a system with clients where I have following data structure: users table: user,pass,name,address,phone,email,creditcard,verificationcode,ispro,istrial,regdate,etc. session table: ...
0
votes
1answer
95 views

Designing a scalable schema for college database [closed]

I am trying to build back end for college ERP system. The system will be based on LAMP. These is the scenario: Colleges have 5 branches There are 4-6 classes in each branch. There are 80 students ...
0
votes
1answer
101 views

Should I use session or cache to keep the time it last polled when polling to server at intervals?

I'm building a web chat app using session to keep the time the app last polled so that the server can determine whether messages exist between the current polling time and last polling time. It works ...
-2
votes
0answers
6 views

PHP/SQL Question [migrated]

There's my problem... I have the following variables: $days_a = $array_total['days']; // This one display days $hours_a = $array_total['hours']; // This one display hours $minutes_a = ...
-2
votes
0answers
11 views

Mysql fulltext match character limit [migrated]

I'm using following query to select most relevant 10 keywords for an article. I use this weird approach because there are 50 million keywords in the table. It's slow but it works good enough for my ...
-1
votes
1answer
76 views

What should my approach be to tagging 10 million articles based on relatedness? [closed]

I have 50 million tags and 10 million articles in mysql db. I want to tag each article with 5 related tags. Tags have 1 to 6 words. Mostly there are 3 words in a tag. I think most accurate and ...
0
votes
0answers
28 views

Querying all data vs required data [duplicate]

If I have a MySQL database that has a table that contains user data, would it be better to load all of the data from the table when loading a page that requires a users data (only one users data is ...
-2
votes
0answers
50 views

Apostrophe in sql string how can I remove [migrated]

I need some help. I use a combo box to create a sql query. Here is the query string SQlstr = "UPDATE maindata SET " _ & "?theoption1 = ?therec1 " _ & "WHERE acct = ...
1
vote
2answers
95 views

Improve the speed of a Tomcat Server with MySQL

I'm developing an application with 3 sides, desktop (JavaFX), server (Tomcat) and Android. And a MySQL Database Server. The app receive mails and convert them into tasks. The tasks are sent to the ...
-2
votes
0answers
48 views

What is the best way to store user uploaded Java files? [duplicate]

I am working on a website where users can upload their own Java files, and we will later compile and execute them. I will address the risks of executing users' code separately, but what would be the ...
1
vote
1answer
48 views

Creating a separate table for images or adding “image fields” to many tables?

I need to create a database in which several tables have images. For example, users have profile pictures and uploaded ones and products have many pictures, as well. Is it better to have one MySql ...
1
vote
1answer
23 views

Should I do a different SQL table for user privacy settings or just keep it at the users table?

So I am developing a Web Application and I have some concerns about the database. I use a lot of boolean settings at the user table with the form privacy_allow_1, privacy_allow_that, ...
0
votes
0answers
29 views

I have two applications… use NoSQL or RDBMS? [duplicate]

I have two applications in the making: one is a budget management tool; the other is a article based places/restaurant guide. The budget management tool works where users create accounts (e.g. bank ...
0
votes
1answer
58 views

Notify about starting event

I am having quite a hard time figuring out how to solve this problem. Basically I have a mini social network with notifications and events. I want to add such functionality where 1 day before an event ...
0
votes
1answer
61 views

DAL / Model / Application-Design Question for a MVC Application

I have a device that stores raw binary log data as a BLOB in a MySQL DB. That process is a blackbox to me (closed source) which I cannot change. I know, however, how to decode that BLOB and transform ...
-1
votes
1answer
100 views

Best way to track 200 boxes [closed]

I have a php/mysql application that needs to track a simple on or off setting for 200 boxes. I use it for a fundraising application. Basically there are 200 buttons. A user selects a button numbered ...
0
votes
0answers
50 views

Automatically verifying INSERTs when building a PHP(5.3.3) application

I am building a form in PHP. I would like to automatically verify that INSERT queries are successful, and populate data correctly, as opposed to running queries in Workbench or MySQL with every code ...
2
votes
1answer
248 views

Architecture for a mobile (Android) chat application

I want to develop a chat application that reminds a bit whatsapp, I am doing it as a learning project. I am currently doing it on Android just because I am doing an Android course. The requirements ...
0
votes
1answer
2k views

Practical mysql schema advice for eCommerce store - Products & Attributes

I am currently planning my first eCommerce application (mySQL & Laravel Framework). I have various products, which all have different attributes. Describing products very simply, Some will have a ...
0
votes
1answer
87 views

Improve processing of data (and structure) from flat file to CMS Database

I have a flat file (CSV) that brings me the data I want, but it needs to be cleaned and processed before it can be used, so I built an intermediate Database (MySQL) in order to get the structure from ...
0
votes
2answers
88 views

SaaS model, 1DB per client

The context we're building a web-based system and one of the design decisions (database related) was whether to have 1 main DB manage all client data VS having 1 DB per client. After reading a lot ...
0
votes
1answer
101 views

RDBMS (MySQL) logic question. How to join multiple “FRIENDS”

so this is a logic question as to creating the proper relationships in a MySQL database. What logic would you choose for the following scenario? This is a back-end for an app where people can have ...
1
vote
3answers
1k views

How do I approach this PHP/MYSQL query?

I have a reservation system that I have coded and my final task is to allow the user to enter a set of dates and then show them all available options. The reservation table is set up with unit_id, ...
1
vote
1answer
113 views

Implementing distributed Semaphore for AWS workload

We have a messaging gateway in AWS (Amazon Cloud) that comprises of a number of nodes (Linux servers) responsible for receiving, routing, despatching and escalating messages (emails, SMS' and voice ...
12
votes
8answers
363 views

500 databases or 1 database with 500 tables or just 1 table with all the records? [duplicate]

I currently have an application that is used by a single end customer. For ease of discussion assume the application only needs a single database table for all records. I now need to support ...
1
vote
1answer
95 views

Transferring information between a web server and a Python backend?

I have been Googling my problem but haven't been able to come up with anything; here's the situation: I have a PHP / MySQL website hosted with 1and1.com. I also have a Python program that runs on a ...
0
votes
1answer
183 views

Penny auction concept and how the timer works

I am creating a penny auction site using PHP yii framework. The main consideration of the system is to update the database records of all active auctions (max 15 auctions) with the current ticker ...
0
votes
0answers
117 views

How many functions called by other functions are too many?

I posted a question about a week ago about using PHPExcel with multiple cases of use and how to simplify it. Since then my process has simplified as we've agreed to work with a single lay out with ...
1
vote
2answers
88 views

How to minimize networking cost of distributed game database?

We've been working on a networked online game project which will run in near future and looking for a satisfying solution for our distributed game database. We didn't take networking costs into ...
0
votes
4answers
302 views

Notifications system with too many subscribers

In my application users can subscribe to other users, like in every social network out there. However I'm experiencing some trouble when a user has too many subscribers. Every time a user posts ...
0
votes
1answer
153 views

Act as MySQL server in Java/Android [closed]

Is it possible to act as a MySQL server in a Java or Android application, such that applications like HeidiSQL can connect to it? What I want to do is to write an application for Android which ...
0
votes
1answer
56 views

How to implement a Daily Recap email of Database records modified the previous day sent to Subscribed Users like Basecamp does?

I am building a Project Management module for SugarCRM. It consists of a "Project" which has information on the project like Name, description, start and completion dates, creator name, status ...
13
votes
6answers
8k views

Is there any reason to use varchar over text columns in a database?

Is varchar just a remnant from before text came around, or are there use cases where you would want to use a varchar? (Or char for that matter..) (I use Postgres and MySQL (MyISAM) daily, so those ...
0
votes
1answer
56 views

Repurpose MySQL as a mutex

My application needs to perform an operation once every 10 minutes, but that operation is triggered many times more frequently. Occasionally it is triggered three or four times a second in different ...
7
votes
8answers
9k views

What is the best way to INSERT a large dataset into a MySQL database (or any database in general)

As part of a PHP project, I have to insert a row into a MySQL database. I'm obviously used to doing this, but this required inserting into 90 columns in one query. The resulting query looks horrible ...
0
votes
0answers
143 views

Best practice: dynamically handle variable data, multiple file uploads and encoding with jQuery, AJAX, PHP and MySQL

I'm currently writing an e-learing web-application. I'm sorry if this is information overkill but I think it's better to describe it in detail so you get the idea. I have made thought on every point ...
4
votes
3answers
1k views

For a large website developed in PHP, is it necessary to have a framework? [closed]

I am wondering if it is necessary to have a framework or if it is a must-have if I plan to make a large website. Large website could mean a lot of things: in other words, multiple dynamic web pages ...
0
votes
0answers
55 views

embedding LEFT OUTER JOIN within INNER JOIN

I am having some problems with one of the question's answered in the book "SQL FOR MERE MORTALS". Here is the problem statement Here is the Database Structure Here is the answer which I am ...
0
votes
1answer
182 views

What is the disadvantage of using abstract class as a database connectivity in zend framework 2 instead of service locator

If I use database by creating adapter with drivers, initialize it in some abstract class and extend that abstract class to required model. Then use simple query statement. Like this: namespace ...
6
votes
4answers
1k views

Is it time to use MariaDB instead of MySQL on application development? Why? [closed]

If you know MariaDB, what's your opinion about migrate applications to use MariaDB instead of MySQL? What we gain and what we lost with this change? Is it really unnecessary to change the ...
0
votes
0answers
25 views

how to reduce or stop duplication of relation's entry in treeview

I want to create tree-view for display or show family member's relation. For this I created 3 tables i.e following. familyDetails->[f_id,fname,lname] relations -> [r_id,relation] .....//e.g ...
0
votes
3answers
128 views

How should I approach storing single boolean results for a whole table?

I previously asked this question on stack overflow. But have not received any responses that might help me. So I thought I would try here. ...
11
votes
2answers
4k views

Data Synchronization in mobile apps - multiple devices, multiple users

I'm looking into building my first mobile app. One of the core features of the application is that multiple devices/users will have access to the same data -- and all of them will have CRUD rights. I ...
-2
votes
3answers
154 views

Trying to understand how MySQL license applies to code I wrote

I have an ERP, coded with Java and the database in MYSQL Community edition. When I was going to sell it to a client he asked me for the sources to my application (with the belief that it is GPLed). I ...
1
vote
3answers
320 views

Passing data between hundreds of objects in java [closed]

Currently, I'm working with a group on building a model. This model simulates interactions between many "agents" in a region. Agents can be any entity such as a city, a farmer, a business etc. Each ...
0
votes
0answers
32 views

Add arguments to mysql in Django's “dbshell”

I'd like to add a couple of command-line arguments to my Django's ./manage.py dbshell command, and I can't figure out how. In specific I'd like to add -A to prevent MySQL from scanning every table ...
2
votes
1answer
191 views

PHP Cache Strategy - Genius or Sheer Stupidity?

I have a shared hosting with limited capabilities. Memcache and mod_cache are not available to me. I would like to implement my own PHP caching method to cache the results of load-intensive SQL query. ...
1
vote
4answers
170 views

MySQL Database design - Opinions

Im working on a web Application for our bussiness with my brother. Our application its pretty simple, will be develop with php and mysql. Clients and providers ABMs Articles Inventory (we do not ...
0
votes
1answer
80 views

How can I cancel all running mysql queries in a web application?

I am running a web application which has to scan (mysql query on a particular column) a huge MySQL table, which has over 100,000 records. The problem I find that when a user requests another page ...