Lucidchart Connect Amsterdam: Lucidchart @ Lavego
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At Lucidchart Connect, attendees improve their diagramming skills by participating in hands-on training, learning from industry thought leaders, hearing innovative use cases from customers, and getting an exclusive scoop on what’s coming next for the product. One of our customer speakers was Leo Stewen, who shared how he uses Lucidchart for database modeling at Lavego.
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Lucidchart Connect Amsterdam: Lucidchart @ Lavego
- 2. Who am I? Leo Stewen Lavego AG Card Payment Processing Industry
- 5. Challenges ● Understand the Application Domain ● Requirements Engineering ● Map this to a Relational Model ● Communication with Devs/Non-Devs ● Documentation of the Database/API
- 7. Old
- 8. New
- 11. Database Modeling Process Requirements Engineering Scope Use Cases 1 Relational Model Mini World Entities Relationships Primary Keys Functional Dependencies 2 Normalization Make it fast 3
- 12. Notation Jungle
- 13. Relational Model Entities: Objects from the mini- world with a set of attributes. Relationships: Connections between those objects. Entity/Relationship Attribute 1 Attribute 2 ... Attribute N
- 14. Requirement I We need to model a terminal from one of our customers with his chosen preferences ENTITY
- 16. Requirement II Every terminal from a customer is connected to a terminal device identifiable with a serial number 1:1 RELATIONSHIP
- 18. Requirement III Terminal devices do have a hardware model with certain features 1:N RELATIONSHIP
- 20. Requirement IV Over the lifetime of a customers there is more than one physical terminal in use N:M RELATIONSHIP
- 22. Current Workflow 01 02 03 04Draft Domain Expert Lucid Adjust Me Lucid Share & Review Colleagues | Domain Expert Confluence Integrate Me Confluence
- 24. Scaling up?
- 25. Scaling Approaches 1. Lucid’s SQL Import and Export Feature 2. Modularization 3. (Dedicated Tools like GraphQL- Voyager)
- 26. Scalability? - Lucid’s SQL
- 27. Ideas... ● GraphQL SDL Import & Export ● Improve Modularization
- 28. Questions?
- 29. Thank You
Editor's Notes
- Here’s the basic outline that you should follow: Customer: Title slide Intro (speaker bio/company intro) (1-2 mins.) Main content (15 - 20 mins.) Problem to solve Lucidchart use case Who? What? Why? How? (Example diagrams) Q&A (3 - 5 mins.) Industry thought leader: Title slide Intro (speaker bio/company intro) (1 - 2 mins.) Main content (15 - 20 mins.) Q&A (5 - 7 mins.)
- Product Engineer at Lavego @Audience Who has ever heard of Lavego? Medium-sized company based in Munich Founded in 1992
- Authorization and Processing of Card Payments at Point of Sale Terminals Trusted Technical Network Provider for EC-Card Payments Bank License from the BaFin Focus on Petrol Stations and Vending Machines Main difference to Other Competitors: Instead of Buying Expensive Software, We Build our own Software to be Flexible and offer More Services next to Plain Payments Processing
- @Audience Developers? Database designer?
- Understand the Application Domain Requirements Engineering Map this to a Relational Model Communication with Devs/Non-Devs Documentation of the Database/API
- Legacy Application is a traditional Win32 App
- Web-Standards based PWA which runs on any system with a decent browser
- Quick intro to Prisma and GraphQL Better Rest: No over- or underfetching
- Requirements Engineering Scope Use Cases Relational Model Choose appropriate Mini-World Find Entities Determine Relationships Find Primary Keys Identify Functional Dependencies Normalization (out of Scope for this Session) Make it fast
- Relationship Multiplicity is important: 1:1, 1:N, N:M Relationships can contain attributes, too. Mapped to flat Excel Tables ;)
- Main Actors: Domain Expert, Me, Insider Colleagues, Outsider Colleagues Iterative Process
- Moving towards the Development Phase after initial Conception Phase Problems: Size of the Project Syncing back and forth between the Diagrams and Code