java - 在 neo4j [JAVA] 中发送查询

Question

我是 Neo4j 和图形数据库的新手，我必须发送查询才能获取一些值。

我有food和category节点，两者之间的关系类型由另一个节点categorized_as指定。

我需要获取的是food_name及其category_name对。

感谢您提前提供的帮助。

Answer 1

Here's the documentation on how to run cypher queries from java 。根据您的示例进行调整，它看起来像这样:

// Create a new graph DB at path DB_PATH
GraphDatabaseService db = new GraphDatabaseFactory().newEmbeddedDatabase( DB_PATH );

// Create a new execution engine for running queries.
ExecutionEngine engine = new ExecutionEngine( db );

ExecutionResult result;

// Queries need to be run inside of transactions...
try ( Transaction ignored = db.beginTx() )
{
    String query = "MATCH (f:food)-[:categorized_as]->(c:category) RETURN f.food_name as foodName, c.category_name as categoryName";

    // Run that query we just defined.
    result = engine.execute(query);

    // Pull out the "foodNames" column from the result indicated by the query.
    Iterator<String> foodNames = result.columnAs( "foodName" );
    // Iterate through foodNames...
}