Add database migration generator and Mermaid ER diagram generator - #8
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Add database migration generator and Mermaid ER diagram generator#8hatcheric950 wants to merge 1 commit into
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Two Python CLI tools for database developer productivity: - `db_tools/migration_generator.py`: diffs two JPA entity Java files and emits Flyway-compatible ALTER TABLE DDL (add/drop/rename/modify columns, unique constraint changes). Handles fully-qualified type names and both multi-line and same-line annotation styles. - `db_tools/er_diagram_generator.py`: parses SQL CREATE TABLE statements (MySQL/PostgreSQL/SQLite syntax, backtick/quote-quoted identifiers, table-level PK/FK/UNIQUE constraints) and produces a Mermaid erDiagram block. - `db_tools_cli.py`: argparse CLI with `migrate` and `er` sub-commands. - `examples/`: User entity v1/v2 pair and a 4-table e-commerce schema. - `tests/`: 58 unit tests covering all public functions (100% pass). https://claude.ai/code/session_012vCaNNL7Z6pJEBbjS8d8nQ
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Summary
db_tools/migration_generator.py): diffs two JPA entity Java source files and emitsALTER TABLEDDL compatible with Flyway versioned migrations. Detects added/dropped columns, renames, type/nullability changes, and unique constraint changes. Handles fully-qualified type names (java.math.BigDecimal) and both multi-line and same-line annotation styles.db_tools/er_diagram_generator.py): parses SQLCREATE TABLEstatements (MySQL/PostgreSQL/SQLite, backtick/quote/bracket-quoted identifiers, table-level PK/FK/UNIQUE constraints) and produces aerDiagramMermaid block withPK/FK/UKmarkers and relationship lines.db_tools_cli.py):migrateandersub-commands with--outputflag support.Userentity v1→v2 diff pair and a 4-table e-commerce schema (users,orders,order_items,products).Test plan
python -m pytest tests/ -v— all 58 tests greenpython db_tools_cli.py migrate --old examples/entities/User_v1.java --new examples/entities/User_v2.java— produces correctALTER TABLE usersDDLpython db_tools_cli.py er --sql examples/schema.sql— produces valid 4-table MermaiderDiagramwith FK relationshipspython db_tools_cli.py er --sql examples/schema.sql --output diagram.md— writes fenced Mermaid block to filehttps://claude.ai/code/session_012vCaNNL7Z6pJEBbjS8d8nQ
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