Expression

See: Migration Expression

Maintenance

Those are migrations that should always be executed at a specified stage.

Warning

Maintenance migrations are always run at the given stage when selected.

Note

A migration must have:

• public visibility
• IMigration as implemented interface (The Migration class already implements it)
• MaintenanceAttribute

Migration Stages

1. BeforeAll: Migration will be run before all standard migrations.
2. BeforeEach: Migration will be run before each standard migration.
3. AfterEach: Migration will be run after each standard migration.
4. BeforeProfiles: Migration will be run after all standard migrations, but before profiles.
5. AfterAll: Migration will be run after all standard migrations and profiles.

Migration

A migration is a database modification usually applied within its own transaction.

Note

A migration must have:

• public visibility
• IMigration as implemented interface (The Migration class already implements it)
• MigrationAttribute

Migration Expression

An expression created from within a migration that gets used to produce an SQL statement (using a migration generator) that gets executed by a migration processor.

A migration expression always implements IMigrationExpression.

Migration Generator

Translates an expression created from within a migration to one or more SQL statements.

A migration generator always implements IMigrationGenerator.

Migration Processor

Passes the expressions to a migration generator and then executes the resulting SQL statements.

A migration processor always implements IMigrationProcessor.

Profile

A profile is used to selectively apply migrations.

Warning

Profiles are always run when selected.

Note

A profile must have:

• public visibility
• IMigration as implemented interface (The Migration class already implements it)
• ProfileAttribute