rusted_cypher

Rust crate for accessing the cypher endpoint of a neo4j server

This crate allows you to send cypher queries to the REST endpoint of a neo4j database. You can execute queries inside a transaction or simply send queries that commit immediately.

Examples

Connecting to a Neo4j database

rust use rusted_cypher::GraphClient; let graph = GraphClient::connect( "http://neo4j:neo4j@localhost:7474/db/data");

Performing Queries

```rust let mut query = graph.query();

// Statement implements From<&str> query.add_statement( "CREATE (n:LANG { name: 'Rust', level: 'low', safe: true })");

let statement = Statement::new( "CREATE (n:LANG { name: 'C++', level: 'low', safe: {safeness} })") .with_param("safeness", false)?;

query.add_statement(statement);

query.send()?;

graph.exec( "CREATE (n:LANG { name: 'Python', level: 'high', safe: true })")?;

let result = graph.exec( "MATCH (n:LANG) RETURN n.name, n.level, n.safe")?;

assert_eq!(result.data.len(), 3);

for row in result.rows() { let name: String = row.get("n.name")?; let level: String = row.get("n.level")?; let safeness: bool = row.get("n.safe")?; println!("name: {}, level: {}, safe: {}", name, level, safeness); }

graph.exec("MATCH (n:LANG) DELETE n")?; ```

With Transactions

```rust let transaction = graph .transaction() .withstatement( "CREATE (n:INTRANSACTION { name: 'Rust', level: 'low', safe: true })");

let (mut transaction, results) = transaction.begin().unwrap();

// Use exec to execute a single statement transaction.exec("CREATE (n:IN_TRANSACTION { name: 'Python', level: 'high', safe: true })")?;

// use add_statement (or with_statement) and send to executes multiple statements let stmt = Statement::new( "MATCH (n:INTRANSACTION) WHERE (n.safe = {safeness}) RETURN n") .withparam("safeness", true)?;

transaction.add_statement(stmt); let results = transaction.send()?;

assert_eq!(results[0].data.len(), 2);

transaction.rollback()?; } ```

Statements with Macro

There is a macro to help building statements

```rust let statement = cypherstmt!( "CREATE (n:WITHMACRO { name: {name}, level: {level}, safe: {safe} })", { "name" => "Rust", "level" => "low", "safe" => true } )?; graph.exec(statement)?;

let statement = cypherstmt!( "MATCH (n:WITHMACRO) WHERE n.name = {name} RETURN n", { "name" => "Rust" } )?;

let results = graph.exec(statement)?; assert_eq!(results.data.len(), 1);

let statement = cypherstmt!("MATCH (n:WITHMACRO) DELETE n")?; graph.exec(statement)?; ```

License

Licensed under either of

• Apache License, Version 2.0, (LICENSE-APACHE or http://www.apache.org/licenses/LICENSE-2.0)
• MIT license (LICENSE-MIT or http://opensource.org/licenses/MIT)

at your option.

Contribution

Unless you explicitly state otherwise, any contribution intentionally submitted for inclusion in the work by you, as defined in the Apache-2.0 license, shall be dual licensed as above, without any additional terms or conditions.