Tutorial Expert How-To - Compare and Merge

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An organization may create several different versions through the lifecycle of a model. That may be because of the natural evolution of the application in a design-first process, or just to keep up with changes being applied to the database instance. In any case, it is often required to compare different versions of a model to understand the differences, and optionally to merge these differences and create a new reference model.

Technology

Hackolade Tutorial
Tutorial – Compare and merge models
Copyright © 2016-2023 Hackolade 1

Model versioning
• Hackolade leverages GIT for powerful and flexible model versioning,
without reinventing the wheel
• Models may diverge in multiple parallel paths before converging
• Old check-out/check-in process which locks modifications by others,
is not flexible enough for agile sprints
• Example:
Copyright © 2016-2023 Hackolade 2

Compare and Merge
• Aims to facilitate merge of versions
• Aims to help validate schemas in
production
• e.g. auditing a production database can be done
automatically with the Hackolade Command-
Line Interface to reveal undocumented &
unvalidated data structures, or synchronize
environments (Dev, Test, UAT, Prod)
Copyright © 2016-2023 Hackolade 3

Compare and merge
• Subject can be:
• previous reference model,
• model issued from reverse-engineering of a database instance or some
other source,
• model that has evolved in a separate branch in GIT
• Etc.
• Models must be of the same target
• 2 distinct views:
• Compare view: 2 side-by-side panes
• Merge view: 3 panes including preview of the resulting merged model
Copyright © 2016-2023 Hackolade 4

Start compare and merge process
• From the Welcome page
• From Tools menu
Copyright © 2016-2023 Hackolade 5

Select the models
• Order of left/right is important
• Can be swapped easily
Copyright © 2016-2023 Hackolade 6

Compare models
• Synchronised scrolling
• Convention is that LEFT model is basis for comparison
• Addition: in the right model, not in the left model
• Deletion: in the left model, not in the right model
• Also includes cases where left model evolved in parallel to the right model
• Moves: not important in JSON – but convenient for humans
• Modifications: changes in properties of objects
• Objects are marked as additions, deletions, modifications or moves
Copyright © 2016-2023 Hackolade 7

Copyright © 2016-2023 Hackolade 8
Compare models

Copyright © 2016-2023 Hackolade 9
Model comparisons can generate Delta Models

Delta model can generate ALTER script
• Depending on the capabilities of the target
Copyright © 2016-2023 Hackolade 10

Merge models
• Accessed by toggling the display to the 3 pane view
• Middle pane = merge proposal
• Proposals can be selected and unselected
• When conflicting differences occur, the merge proposal uses by
default the right-hand model value, but can be unchecked by user
• Deletions are retained unless unchecked
Copyright © 2016-2023 Hackolade 11

Merge models
• Either create a new file or a new version of a (GIT-enabled) file
Copyright © 2016-2023 Hackolade 12

Reading material
• See Hackolade online documentation
• The Hackolade Blog
• This excellent new book:
MongoDB Data Modeling & Schema Design
• Many of the principles in the book are related to query
driven modeling based on access patterns!
• Hackolade’s on social media: LinkedIn page, Twitter page
• Download Hackolade studio for free
Copyright © 2016-2023 Hackolade 13

Questions?
Answers!
Copyright © 2016-2023 Hackolade 14

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Tutorial Expert How-To - Compare and Merge

2. Model versioning • Hackolade leverages GIT for powerful and flexible model versioning, without reinventing the wheel • Models may diverge in multiple parallel paths before converging • Old check-out/check-in process which locks modifications by others, is not flexible enough for agile sprints • Example: Copyright © 2016-2023 Hackolade 2

3. Compare and Merge • Aims to facilitate merge of versions • Aims to help validate schemas in production • e.g. auditing a production database can be done automatically with the Hackolade Command- Line Interface to reveal undocumented & unvalidated data structures, or synchronize environments (Dev, Test, UAT, Prod) Copyright © 2016-2023 Hackolade 3

4. Compare and merge • Subject can be: • previous reference model, • model issued from reverse-engineering of a database instance or some other source, • model that has evolved in a separate branch in GIT • Etc. • Models must be of the same target • 2 distinct views: • Compare view: 2 side-by-side panes • Merge view: 3 panes including preview of the resulting merged model Copyright © 2016-2023 Hackolade 4

7. Compare models • Synchronised scrolling • Convention is that LEFT model is basis for comparison • Addition: in the right model, not in the left model • Deletion: in the left model, not in the right model • Also includes cases where left model evolved in parallel to the right model • Moves: not important in JSON – but convenient for humans • Modifications: changes in properties of objects • Objects are marked as additions, deletions, modifications or moves Copyright © 2016-2023 Hackolade 7

11. Merge models • Accessed by toggling the display to the 3 pane view • Middle pane = merge proposal • Proposals can be selected and unselected • When conflicting differences occur, the merge proposal uses by default the right-hand model value, but can be unchecked by user • Deletions are retained unless unchecked Copyright © 2016-2023 Hackolade 11

13. Reading material • See Hackolade online documentation • The Hackolade Blog • This excellent new book: MongoDB Data Modeling & Schema Design • Many of the principles in the book are related to query driven modeling based on access patterns! • Hackolade’s on social media: LinkedIn page, Twitter page • Download Hackolade studio for free Copyright © 2016-2023 Hackolade 13

Tutorial Expert How-To - Compare and Merge

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