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Closed 10 years ago.
I find that creating SQL tables tedious when starting to create a web app (ASP/Python/PHP).
Do you guys know any tools that makes creating tables quicker and faster and easier? Thanks in advance! :-)
In my opinion writing a CREATE TABLE statement is far less tedious than writing HTML pages.
The recommended approach is to use a ER design tool co create and define your database model. Most (if not all) ER designer can then create the necessary DDL statement directly from the model.
With this approach you also have a documentation of your database model which is always a good thing.
It depends on the tools/libraries you use to create your app.
If you use an ORM, many ORMs offer you the possibility to create the database with all tables automatically, according to the classes and mappings you defined in your application.
Related
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Closed 9 years ago.
I am totally new to the subject of databases and I have only theoretical knowledge about it.I want to run the SQL commands I read about but totally clueless where to run it.The definition says SQL is a special purpose programming language.If so why doesn't it have a compiler?And if I have to install in a RDBMS on my computer to practice SQL, what is the one you would suggest for learners?Can SQL commands be run in all RDBMS?
I am totally despondent about it,utterly clueless.Please help me take the first step.Just a simple thing--Where on earth to run those SQL commands?
You can use http://sqlfiddle.com/ to test your queries. There you can chose a database (mysql, Oracle, Sql Server or other), generate test tables, fill them with test data and generate test queries to this data
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Closed 10 years ago.
I have a project that's in the design phase and looking at my options have decided on using Postgresql for the application backend because of licensing and features. I have searched around but I am unable to find any solid information on using Postgresql in Xcode or even with OSX applications. Could someone point me in the right direction any help would be greatly appreciated.
You have not given quite a lot of context.
On the application side there are quite a few pieces of software running under OS X that interface with PostgreSQL, for example the standard GUI pgAdmin.
But I believe you're more concerned about the developers perspective. Probably the most common way is to use the libpq library that comes with PostgreSQL. It is well documented and rather stable. Integration into your software project should be straightforward.
If you are looking for an Objective-C framework, you could try out BaseTen. Never used that one, though.
If you want more specific help, you have to ask more specific questions.
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Closed 11 years ago.
as the topic header shows my question is about Coding an online chess by VB.net.
I coded the chess game with all rules , now I designed a login form for it, but I don't know how to connect to a Database and send query , to check the User and pass.
I searched about connecting to a DB and I found something. but i didn't found anything about sending query.
I need a code that contains connecting to a DB and sending query for example about checking username and password to DB.
thanks.
Well, the simplest answer is to use what's called ADO.NET. It's basically a set of classes within the .NET Framework which are used to access a database. Depending on the database you use, there may be a built-in driver (MS SQL, Access, etc.) or you may need to use a 3rd party one (MySQL, PostgreSQL, etc.).
Here are a couple of examples. There are many more.
You can also use LINQ to SQL, which internally uses ADO.NET but presents the data access to the developer is a more fluent way. Or take it another step and use Entity Framework. Etc.
Essentially the question itself is very broad. There are a number of ways you can access a database. But these are the places to get started. If/When you run into specific issues with code not working the way you expect, we'll be happy to help.
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Closed 11 years ago.
I have worked on several rails applications and now I work on a very complex one, from the database side. A lots of nested models, several polymorphyc associations...
How you deal with that complexity ? How can I know that we are working in the good direction ? What about performance issues ?
Thansk for your opinions.
First of all, you need to estimate the performance of the queries that your application runs against the database. Then you can try to optimize the queries, for example, by adding some indexes. Maybe in some cases you will also need to consider denormalizing some data to get better performance.
Performance of the queries may also depend on your data size. If you have really big data set and queries are optimal, then you may consider introducing (distributed) caching. Or if data model allows that think of partitioning your database on several nodes to improve query performance.
But still the first step should be a setup of some SQL query performance monitoring.
You should consider a NOSQL solution such as MongoDB or CouchDB. Sometimes an RDBMS is not the right tool for the job.
http://www.mongodb.org/
http://couchdb.apache.org/
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Closed 12 years ago.
I need to find the best solution to make the DB Normalized with large amount of data expected.
My site has a Table Tags (contain key word,id) and also 4 types of data related to this tags table like(articles,resources,jobs,...).
The big question is:-
for the relation with tags what best solution for optimazaion & query speed?
make a table for each relation like:
table articlesToTags(ArticleID,TagID)
table jobsToTags(jobid,tagid)
etc.
or put it all in one table like
table tagsrelation(tagid,itemid,itemtype)
I need your help. Please provide me with articles to help me in this design
consider that in future the site can conation new section relate to tag
Thanks
I would go for the normalized version of your schema (which is the table-relation). This type of schemas are very useful for scenarios where the application might grow.
The bad thing of having all the data in just one table is that if you have a bunch of attributes for both relationships, you'll end up with a table with a lot of attributes, which when growing will be slow to query, thus becoming a performance hit of your app.
So, finally the problem is to choose simplicity and quick end against well designed code considering scalability as well.
Hope I can help