WeaselDatabase Schema Management for .NET

Programmatic schema definitions, automatic migrations with delta detection, and ADO.NET helpers across PostgreSQL, SQL Server, Oracle, MySQL, and SQLite.

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Multi-Database Support

First-class support for PostgreSQL, SQL Server, Oracle, MySQL, and SQLite with provider-specific features like partitioning, stored procedures, and JSON columns.

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Schema Migrations

Automatic delta detection compares your in-memory schema definitions against the actual database and applies only the necessary changes.

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Command Builders & Batching

Reduce network round trips with batched command execution for PostgreSQL (NpgsqlBatch) and SQL Server (SqlBatch), plus fluent SQL building helpers.

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CLI Tools

Built-in db-apply, db-assert, db-patch, db-dump, and db-list commands integrate into any .NET application via JasperFx command line tooling.

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EF Core Integration

Map Entity Framework Core DbContext models to Weasel tables for unified schema migration alongside Marten or Polecat document stores.

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Part of the Critter Stack

Extracted from Marten and used by Wolverine and Polecat. Battle-tested in production across the JasperFx ecosystem.