quaint's Introduction

Quaint

Quaint is an abstraction over certain SQL databases. It provides:

An AST for building dynamic SQL queries.
Visitors for different databases to generate SQL strings.
Connectors to abstract over results and querying.
Pooling with mobc
Async/await and Futures 0.3

Documentation

Feature flags

mysql: Support for MySQL databases.
postgresql: Support for PostgreSQL databases.
sqlite: Support for SQLite databases.
mssql: Support for Microsoft SQL Server databases.
pooled: A connection pool in pooled::Quaint.
json: JSON type support with serde_json crate.
uuid: UUID type support with uuid crate.
chrono: DateTime type support with chrono crate.
serde-support: Deserialize support from result set with serde crate.
bigdecimal: Numeric values can be read as BigDecimal.
vendored-openssl: Statically links against a vendored OpenSSL library on non-Windows or non-Apple platforms.

Goals:

Query generation when the database and conditions are not known beforehand.
Parameterized queries and SQL injection protection.
A modular design, a separate AST and separate visitors and connectors.

Non-goals:

Database-level type-safety in query building or being an ORM.

For type-safe database abstraction, Diesel is an excellent choice.

Testing:

See .envrc for connection params. Override variables if different. MySQL, PostgreSQL and SQL Server needs to be running for tests to succeed.

Then:

> cargo test

Query debug

The queries can be logged by setting the LOG_QUERIES environment variable to any value. They'll be logged at the INFO level and are visible when having a logger in scope.