A VS Code extension for ER diagrams — an ERMaster replacement with full
compatibility with the .erm format: files open and save so that the
original Eclipse ERMaster plugin still reads them (and vice versa).
Features
Visual .erm editor (custom editor, SVG canvas)
tool palette (Select / Table / Note / Relation)
ERMaster-style tables: colored header, primary keys on top with a
separator, PK/FK markers
relations in IE (crow's foot) notation, auto-created FK columns
edit dialogs on double-click; context menu; zoom/pan
ERMaster compatibility — the native XML format is implemented:
word dictionary, relations with cardinalities, indexes (including the
historical <inidex> typo), categories, test data, change tracking and
settings all survive a round-trip losslessly; cross-references are
renumbered exactly like PersistentXmlImpl
DDL generation — PostgreSQL and MySQL (tables, PK, FK, UNIQUE, indexes,
comments, sequences, views)
DDL import — turn a .sql file into a diagram
Image export — SVG and PNG
Validation — duplicate/empty names, missing PK, missing type reported in
the Problems panel
Usage
Open any .erm file — it opens as a diagram
(right-click → Open With → Text Editor for the raw XML)
ERD: New Diagram — create a new file
ERD: Generate DDL — DDL toolbar button or right-click a .erm in the explorer
ERD: Import DDL (.sql) as Diagram — right-click a .sql file
Development
npm install
npm run compile # or npm run watch
npm run typecheck
npm test
Press F5 to launch the Extension Host, then open examples/shop.erm.
