feat(drizzle): update with postgres and mysql connectors

[pi0]

Summary

• Restructure drizzle integration into dialect-specific subdirectories (sqlite/, postgres/, mysql/) with backwards-compatible re-exports
• Add db0/integrations/drizzle/postgres with full PgSession, PgTransaction, and PgPreparedQuery implementations
• Add db0/integrations/drizzle/mysql with full MySqlSession, MySqlTransaction, and MySqlPreparedQuery implementations
• Implement transactions and nested savepoints for all three dialects
• Implement values() for SQLite, fillPlaceholders for proper placeholder handling
• Remove unused _utils.ts (mapResultRow no longer needed since db0 returns object rows)

New structure

src/integrations/drizzle/
├── index.ts                  # Re-exports sqlite (backwards compatible)
├── sqlite/
│   ├── index.ts              # drizzle() for SQLite
│   └── _session.ts           # DB0SQLiteSession, DB0SQLiteTransaction, DB0SQLitePreparedQuery
├── postgres/
│   ├── index.ts              # drizzle() for PostgreSQL
│   └── _session.ts           # DB0PgSession, DB0PgTransaction, DB0PgPreparedQuery
└── mysql/
    ├── index.ts              # drizzle() for MySQL (supports mode: 'planetscale')
    └── _session.ts           # DB0MySqlSession, DB0MySqlTransaction, DB0MySqlPreparedQuery

Usage

// SQLite (unchanged, backwards compatible)
import { drizzle } from "db0/integrations/drizzle";

// PostgreSQL
import { drizzle } from "db0/integrations/drizzle/postgres";

// MySQL
import { drizzle } from "db0/integrations/drizzle/mysql";

Test plan

• Existing SQLite drizzle tests pass (insert, select, schema, logger)
• SQLite transaction tests (commit, rollback, nested savepoints)
• PostgreSQL drizzle tests via pglite (insert, select, transactions, rollback, nested savepoints)
• MySQL drizzle tests (behind MYSQL_URL env check)
• Full test suite passes (57 tests, 0 failures)

🤖 Generated with Claude Code

Summary by CodeRabbit

• Refactor

  • Restructured drizzle ORM integration into database-specific modules for improved organization and maintainability.

• New Features

  • Added MySQL integration for drizzle ORM.
  • Added PostgreSQL integration for drizzle ORM.
  • Enhanced SQLite integration with improved session management.

• Tests

  • Added comprehensive integration tests for MySQL backend.
  • Added comprehensive integration tests for PostgreSQL backend.
  • Added comprehensive integration tests for SQLite backend with multiple connector support.

[coderabbitai]

Caution

Review failed

The pull request is closed.

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 541e3262-7a61-4fbf-a937-7d84b0f8a29e

📥 Commits

Reviewing files that changed from the base of the PR and between c180379 and b799ea5.

📒 Files selected for processing (13)

• src/integrations/drizzle/_session.ts
• src/integrations/drizzle/_utils.ts
• src/integrations/drizzle/index.ts
• src/integrations/drizzle/mysql/_session.ts
• src/integrations/drizzle/mysql/index.ts
• src/integrations/drizzle/postgres/_session.ts
• src/integrations/drizzle/postgres/index.ts
• src/integrations/drizzle/sqlite/_session.ts
• src/integrations/drizzle/sqlite/index.ts
• test/integrations/drizzle.test.ts
• test/integrations/drizzle/mysql.test.ts
• test/integrations/drizzle/pg.test.ts
• test/integrations/drizzle/sqlite.test.ts

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📝 Walkthrough

Walkthrough

The PR refactors the Drizzle ORM integration from a single generic DB0 layer to database-specific implementations for SQLite, PostgreSQL, and MySQL. Each database now has dedicated session, transaction, and prepared query classes with updated test coverage and a restructured public API.

Changes

Cohort / File(s)	Summary
SQLite Integration src/integrations/drizzle/sqlite/_session.ts, src/integrations/drizzle/sqlite/index.ts	Implements DB0SQLiteSession, DB0SQLiteTransaction, and DB0SQLitePreparedQuery for SQLite backend with support for nested transactions via savepoints, placeholder substitution, and optional logging.
PostgreSQL Integration src/integrations/drizzle/postgres/_session.ts, src/integrations/drizzle/postgres/index.ts	Introduces DB0PgSession, DB0PgTransaction, and DB0PgPreparedQuery for PostgreSQL backend with savepoint-based nested transaction support and count query helper.
MySQL Integration src/integrations/drizzle/mysql/_session.ts, src/integrations/drizzle/mysql/index.ts	Adds DB0MySqlSession, DB0MySqlTransaction, and DB0MySqlPreparedQuery for MySQL backend with transaction initialization and savepoint-based nested transaction support.
API Entry Point Restructuring src/integrations/drizzle/index.ts	Removed the generic drizzle function and types; now re-exports from sqlite implementation. Index becomes a pass-through to sqlite-specific exports with type aliases for backward compatibility.
Removed Generic Layer src/integrations/drizzle/_session.ts, src/integrations/drizzle/_utils.ts	Deleted the monolithic DB0Session, DB0PreparedQuery classes and mapResultRow utility that previously provided a non-database-specific implementation.
SQLite Tests test/integrations/drizzle/sqlite.test.ts	New test suite covering better-sqlite3, sqlite3, and libsql-node connectors with CRUD operations, transactions, savepoint nesting, and logger configuration.
PostgreSQL Tests test/integrations/drizzle/pg.test.ts	New test suite for pglite and PostgreSQL connectors including insert, select, basic transactions, rollback, and nested transaction via savepoints.
MySQL Tests test/integrations/drizzle/mysql.test.ts	New test suite for mysql2 connector covering insert, select, transaction commit, and transaction rollback scenarios.
Old Tests test/integrations/drizzle.test.ts	Removed monolithic test file covering generic better-sqlite3, schema-aware, and PostgreSQL scenarios; replaced by database-specific test suites.

Estimated code review effort

🎯 4 (Complex) | ⏱️ ~60 minutes

The review requires verification of three parallel database-specific implementations following similar architectural patterns (session → transaction → prepared query), assessment of each database's unique control flow (particularly transaction and savepoint handling), validation of API surface changes and backward compatibility via re-exports, and confirmation that test coverage adequately replaces the removed monolithic tests. The heterogeneity of database-specific logic combined with architectural restructuring increases cognitive load.

Poem

🐰 Three databases stood in a line,
As monolithic turned to design,
SQLite, Postgres, MySQL so bright,
Each with their session, transaction, and plight,
Refactored with care, they hop through the night! 🌙

✨ Finishing Touches

• 📝 Generate docstrings (stacked PR)
• 📝 Generate docstrings (commit on current branch)

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch feat/drizzle-postgres-connector

📝 Coding Plan

• Generate coding plan for human review comments

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