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Database application using MVC paradigm


Database application using MVC paradigm

By : DAVIDSCOPE
Date : January 10 2021, 01:45 PM
Hope this helps In classic Delphi database application we have a form, a set of data-aware visual controls connected to TDataSets via TDataSources. If one wants to design database application using MVC model, where to place TDataSet components? Should they stay on form and therefore be a part of View? Or should they be encapsulated inside some Model object? If the latter how they could be bound to visual components? , You could see delphi project via MVC eyes like this:
code :


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Distributed Database Computing - Is it really possible within the RDBMS paradigm?

Distributed Database Computing - Is it really possible within the RDBMS paradigm?


By : Kinkar Sarkar
Date : March 29 2020, 07:55 AM
should help you out I guess you are asking about scalability of RDBMS databases. Talking about NoSQL databases based on ( amazon dynamo, BigTable ) are a whole another topic. I am talking about HBase, Cassandra etc. There are also commerical products like Oracle Coherence thats more like a distributed cache and key value store , to put it crudely.
going back to rdbms,
why VISUAL PARADIGM 8.0 can not create database from ERD?

why VISUAL PARADIGM 8.0 can not create database from ERD?


By : Mer Alba
Date : March 29 2020, 07:55 AM
I hope this helps you . the problem is MySQL 5.5 doesn't support "type" table option and the new option is "Engine". So simply you can change your mysql version to <5.5 or find a way to edit jdbc library to create querys with Engine Option, instead of type.
Choosing database paradigm

Choosing database paradigm


By : Khandokar
Date : March 29 2020, 07:55 AM
it helps some times I would recommend Fighting the NoSQL mindset and NoNoSQL
Neither of these are biased towards traditional RDBMS despite their titles, they both give pretty decent perspectives on the tradeoffs. This topic has raged for years all over the internet but quality articles are hard to pick out of the noise. Good luck!
How to use ServiceStack Redis in a web application to take advantage of pub / sub paradigm

How to use ServiceStack Redis in a web application to take advantage of pub / sub paradigm


By : tauqir azam
Date : March 29 2020, 07:55 AM
hop of those help? Actually Redis Pub/Sub handles this scenario quite well, as Redis is an async non-blocking server it can hold many connections cheaply and it scales well.
Salvatore (aka Mr Redis :) describes the O(1) time complexity of Publish and Subscribe operations:
Relation database design,one to many paradigm

Relation database design,one to many paradigm


By : Zak Driscoll
Date : March 29 2020, 07:55 AM
like below fixes the issue In ER Modeling, relationships/associations are on entities. In the relational model, relationships/associations are on values. (Many so-called ER diagrams don't actually show entities & relationships, but instead show their tables.)
Binary relationships have cardinalities. A table represents a relationship. Eg the relationship Sent(sender, message) "user sender sent message message". Which is 1 to many because each sender in it is paired with 1 or more messages in it. Eg the relationship Received(sender, message) "user receiver received message message". Which is 1 to many because each receiver in it is paired with 1 or more messages in it. Sometimes one relationship can be expressed in terms of others. Eg you have relationship Message(sender, message, receiver) "user sender sent message message to user receiver"; it is Sent(sender, message) AND Received(sender, message). It's non-binary; it doesn't have a binary cardinality; it has those other two binary relationships/cardinalities associated with it.
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