ml4ai/rsmgclient

Memgraph database adapter for Rust programming language.

rsmgclient - Rust Memgraph Client

rsmgclient is a Memgraph database adapter for Rust programming language. The rsmgclient crate is the current implementation of the adapter. It is implemented as a wrapper around mgclient, the official Memgraph C/C++ client library.

Installation

Prerequisites

• Rust 1.42.0 or above
• Prerequisites of mgclient:
  • A C compiler supporting C11 standard
  • CMake 3.8 or newer
  • OpenSSL 1.0.2 or newer

Installing from crates.io

Once prerequisites are met, if you want to use rsmgclient as a library for your own Rust project, you can install it using cargo:

cargo install rsmgclient

NOTE: The default OpenSSL path on Windows is C:\Program Files\OpenSSL-Win64\lib, if you would like to change that please provide OPENSSL_LIB_DIR env variable.

Building from Source

To contribute into rsmgclient or just to look more closely how it is made, you will need:

• Cloned rsmgclient repository
• Properly initialized mgclient, please take care of the mgclient requirements.
• Memgraph Quick Start Guide

Once rsmgclient is cloned, you will need to build it and then you can run the test suite to verify it is working correctly:

git submodule update --init
cargo build
# Please run Memgraph based on the quick start guide
cargo test

On MacOS, the build will try to detect OpenSSL by using MacPorts or Homebrew.

On Windows, bindgen requires libclang which is a part of LLVM. If LLVM is not already installed just go to the LLVM download page, download and install LLVM.exe file (select the option to put LLVM on the PATH). In addition, default OpenSSL path is C:\Program Files\OpenSSL-Win64\lib, if you would like to change that please provide OPENSSL_LIB_DIR env variable during the build phase.

Documentation

Online documentation can be found on docs.rs pages.

Code Sample

src/main.rs is an example showing some of the basic commands:

use rsmgclient::{ConnectParams, Connection, MgError, Value};

fn execute_query() -> Result<(), MgError> {
    // Connect to Memgraph.
    let connect_params = ConnectParams {
        host: Some(String::from("localhost")),
        ..Default::default()
    };
    let mut connection = Connection::connect(&connect_params)?;

    // Create simple graph.
    connection.execute_without_results(
        "CREATE (p1:Person {name: 'Alice'})-[l1:Likes]->(m:Software {name: 'Memgraph'}) \
         CREATE (p2:Person {name: 'John'})-[l2:Likes]->(m);",
    )?;

    // Fetch the graph.
    let columns = connection.execute("MATCH (n)-[r]->(m) RETURN n, r, m;", None)?;
    println!("Columns: {}", columns.join(", "));
    for record in connection.fetchall()? {
        for value in record.values {
            match value {
                Value::Node(node) => print!("{}", node),
                Value::Relationship(edge) => print!("-{}-", edge),
                value => print!("{}", value),
            }
        }
        println!();
    }
    connection.commit()?;

    Ok(())
}

fn main() {
    if let Err(error) = execute_query() {
        panic!("{}", error)
    }
}