Application Examples Using Parameters

Example: Java

Here is a code snippet that illustrates the use of parameters in Java:

try (var session = driver.session()) {
  Result res = session.readTransaction(tx -> tx.run("""
    MATCH (p:Person)-[:ACTED_IN]->(m:Movie)
    WHERE m.title = $title
    RETURN p
    LIMIT 10
  """, Values.parameters("title", "Toy Story")));
}

In this example, the parameters are passed to the second argument of the tx.run method using the static parameters function provided by the org.neo4j.driver.Values class.

For more information on using parameters in Java, check out the Building Neo4j Applications with Java course.

Example: JavaScript

Here is a code snippet that illustrates the use of parameters in JavaScript:

const session = driver.session()
const res = await session.readTransaction(tx =>
  tx.run(`
    MATCH (p:Person)-[:ACTED_IN]->(m:Movie)
    WHERE m.title = $title
    RETURN p
    LIMIT 10
  `,
  { title: 'Toy Story'})
)

In this example, the parameters are passed to the second argument of the tx.run method as a JavaScript object.

For more information on using parameters in JavaScript, check out the Building Neo4j Applications with Node.js course.

Example: Python

Here is a code snippet that illustrates the use of parameters in Python:

def get_actors(tx, movieTitle): # (1)
  result = tx.run("""
    MATCH (p:Person)-[:ACTED_IN]->(m:Movie)
    WHERE m.title = $title
    RETURN p
  """, title=movieTitle)

  # Access the `p` value from each record
  return [ record["p"] for record in result ]

with driver.session() as session:
    result = session.read_transaction(get_actors, movieTitle="Toy Story")

In Python, Cypher parameters are passed as named parameters to the tx.run method. In this example, title has been passed as a named parameter.

For more information on using parameters in Python, check out the Building Neo4j Applications with Python course.

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