ruvector/examples/graph/cypher_queries.rs

//! Cypher Query Examples
//!
//! This example demonstrates Neo4j-compatible Cypher queries:
//! - CREATE: Creating nodes and relationships
//! - MATCH: Pattern matching
//! - WHERE: Filtering results
//! - RETURN: Projecting results
//! - Aggregations and complex queries

fn main() {
    println!("=== RuVector Graph - Cypher Queries ===\n");

    // TODO: Once the graph API is exposed, implement:

    println!("1. Simple CREATE Query");
    // let query = "CREATE (n:Person {name: 'Charlie', age: 28}) RETURN n";
    // let result = db.execute_cypher(query)?;
    // println!("   Query: {}", query);
    // println!("   Result: {:?}", result);

    println!("\n2. Pattern Matching");
    // let query = r#"
    //     MATCH (p:Person)
    //     WHERE p.age > 25
    //     RETURN p.name, p.age
    //     ORDER BY p.age DESC
    // "#;
    // let result = db.execute_cypher(query)?;
    // println!("   Query: {}", query);
    // println!("   Result: {:?}", result);

    println!("\n3. Creating Relationships");
    // let query = r#"
    //     MATCH (a:Person {name: 'Alice'})
    //     MATCH (b:Person {name: 'Charlie'})
    //     CREATE (a)-[r:KNOWS {since: 2023}]->(b)
    //     RETURN r
    // "#;
    // let result = db.execute_cypher(query)?;
    // println!("   Query: {}", query);
    // println!("   Result: {:?}", result);

    println!("\n4. Traversal Queries");
    // let query = r#"
    //     MATCH (start:Person {name: 'Alice'})-[:KNOWS*1..3]->(end:Person)
    //     RETURN end.name, length((start)-[:KNOWS*]->(end)) as distance
    //     ORDER BY distance
    // "#;
    // let result = db.execute_cypher(query)?;
    // println!("   Query: {}", query);
    // println!("   Result: {:?}", result);

    println!("\n5. Aggregation Queries");
    // let query = r#"
    //     MATCH (p:Person)
    //     RETURN
    //         count(p) as total_people,
    //         avg(p.age) as average_age,
    //         min(p.age) as youngest,
    //         max(p.age) as oldest
    // "#;
    // let result = db.execute_cypher(query)?;
    // println!("   Query: {}", query);
    // println!("   Result: {:?}", result);

    println!("\n6. Shortest Path");
    // let query = r#"
    //     MATCH path = shortestPath(
    //         (a:Person {name: 'Alice'})-[:KNOWS*]-(b:Person {name: 'Bob'})
    //     )
    //     RETURN path, length(path) as distance
    // "#;
    // let result = db.execute_cypher(query)?;
    // println!("   Query: {}", query);
    // println!("   Result: {:?}", result);

    println!("\n7. Pattern Comprehension");
    // let query = r#"
    //     MATCH (p:Person)
    //     RETURN p.name, [(p)-[:KNOWS]->(friend) | friend.name] as friends
    // "#;
    // let result = db.execute_cypher(query)?;
    // println!("   Query: {}", query);
    // println!("   Result: {:?}", result);

    println!("\n8. Complex Multi-Pattern Query");
    // let query = r#"
    //     MATCH (p:Person)-[:LIVES_IN]->(city:City)
    //     MATCH (p)-[:WORKS_AT]->(company:Company)
    //     WHERE city.name = 'San Francisco' AND company.industry = 'Tech'
    //     RETURN p.name, company.name, p.salary
    //     ORDER BY p.salary DESC
    //     LIMIT 10
    // "#;
    // let result = db.execute_cypher(query)?;
    // println!("   Query: {}", query);
    // println!("   Result: {:?}", result);

    println!("\n9. Updating Properties with Cypher");
    // let query = r#"
    //     MATCH (p:Person {name: 'Alice'})
    //     SET p.age = p.age + 1, p.updated_at = timestamp()
    //     RETURN p
    // "#;
    // let result = db.execute_cypher(query)?;
    // println!("   Query: {}", query);
    // println!("   Result: {:?}", result);

    println!("\n10. Conditional Creation (MERGE)");
    // let query = r#"
    //     MERGE (p:Person {email: 'alice@example.com'})
    //     ON CREATE SET p.name = 'Alice', p.created_at = timestamp()
    //     ON MATCH SET p.last_seen = timestamp()
    //     RETURN p
    // "#;
    // let result = db.execute_cypher(query)?;
    // println!("   Query: {}", query);
    // println!("   Result: {:?}", result);

    println!("\n=== Example Complete ===");
    println!("\nNote: This is a template. Actual implementation pending graph API exposure.");
}