pg_parse  

PostgreSQL parser for Rust that uses the actual PostgreSQL server source to parse SQL queries and return the internal PostgreSQL parse tree.

Getting started

Add the following to your Cargo.toml

[dependencies]
pg_parse = "0.9"

Example: Parsing a query

use pg_parse::ast::Node;

let result = pg_parse::parse("SELECT * FROM contacts");
assert!(result.is_ok());
let result = result.unwrap();
assert!(matches!(*&result[0], Node::SelectStmt(_)));

// We can also convert back to a string
assert_eq!(result[0].to_string(), "SELECT * FROM contacts");

What's the difference between pg_parse and pg_query.rs?

The pganalyze organization will maintain the official implementation called pg_query.rs. This closely resembles the name of the C library also published by the team (libpg_query). This implementation will use the protobuf interface introduced with version 13 of libpg_query.

This library similarly consumes libpg_query however utilizes the older JSON interface to manage parsing. The intention of this library is to maintain a dependency "light" implementation with serde being the only required runtime dependency. While this was originally called pg_query.rs it makes sense to decouple itself from the official naming convention and go on it's own. Hence pg_parse.

So which one should you use? You probably want to use the official pg_query.rs library as that will continue to be kept closely up to date with libpg_query updates. This library will continue to be maintained however may not be as up to date as the official implementation.

Credits

A huge thank you to Lukas Fittl for all of his amazing work creating libpg_query.