v0.4.0

Blog post: https://blog.lucasholten.com/rust-query-0-4/

Optional Queries

• Added optional combinator.
• Changed Expr to be co-variant in its lifetime.

Basic Datatypes and Operations

• Added support for Vec<u8> data type (sqlite BLOB).
• Added some more basic operations on expressions.

Updates, Insert and Query

• Added safe updates of a subset of columns for each table.
• Update statements now use the Update type for each column.
• Insert and update conflict is now an Expr (find_or_insert returns an Expr now too).
• Rows::into_vec is no longer sorted automatically.

Schema and Mirations

• Changed #[schema] syntax to be a module of structs.
• Added #[from] attribute to allow renaming tables and splitting tables in the schema.
• The generated migration structs have moved from e.g. v1::update::UserMigration to v0::migrate::User.
• Migrations now require explicit handling of potential unique constraint violations.
• Migrations now require explicit handling of foreign key violations.

Type Driven Select

• Added a macro for each table to create ad-hoc column selection types like User!(name, age).
• Added the FromExpr trait to allow custom column selection and conversion.

Feature Flags and Dependencies

• TransactionWeak::rusqlite_transaction is renamed and no longer behind a feature flag.
• hash_schema method was moved behind dev feature which is enabled by default.
• Updated dependencies.

Renaming

• Renamed Dummy to Select.
• Renamed Column to Expr.
• Renamed try_insert to insert and insert to insert_ok.
• Renamed try_delete to delete and delete to delete_ok.
• Renamed try_update to update and update to update_ok.