SQL Persistence

Stores NServiceBus data in various relational database engines, without the need for an intermediate ORM, using only a configured DbConnection.

Highlights

• Supports multiple database engines.
• No ORM dependency: can be used with Entity Framework, Dapper, etc.
• Independent tables for each endpoint. No "noisy neighbor" problems.
• Generates DDL scripts at compile time in the build output directory.
• Generated scripts can be promoted outside the build directory and:
  • Added to source control.
  • Compared using a diff viewer.
  • Inspected by DBAs.
  • Treated as first-class citizens in operations workflows for installation and deployment.
• Sagas are:
  • Stored using Json.NET to serialize complex data structures, with no need to manage complex table structures.
  • Built to be version-aware with support for data evolution.
  • Built to allow changing the CorrelationId over time.

Supported SQL implementations

• SQL Server
• MySQL
• Oracle
• PostgreSQL

NuGet Packages

The SQL Persister requires the NServiceBus.Persistence.Sql package, which contains:

• APIs for manipulating EndpointConfiguration.
• Runtime implementations of saga, timeouts, subscriptions, and outbox persisters.
• Attributes used to define compile-time configuration settings.
• [Version 4.3+] An MSBuild target that generates the required SQL installation scripts at compile time.
• Optionally runs SQL installation scripts at endpoint startup for development purposes. See Installer Workflow.

Other packages

• NServiceBus.Persistence.Sql.MsBuild - In version 4.2 and below, this package must also be referenced to generate scripts. In version 4.3 and above, this package is deprecated, as the generation capability is built in to the main package.
• NServiceBus.Persistence.Sql.ScriptBuilder - This package contains the APIs that enable the generation of SQL installation scripts using code outside of a compile context. It is not intended for general usage, and in future releases, the API may evolve in ways that do not follow semantic versioning.

Script creation

SQL installation scripts are created as a compile-time output alongside a project's binary outputs. Additionally, these scripts can be promoted to a directory under source control so that differences can be easily tracked and analyzed. To learn more, see Controlling Script Generation.