Question

我是neo4j和graph数据库的新手，我必须发送一个查询来获取一些值。

我有食物和类别节点，两者之间的关系类型由另一个节点 categorized_as 指定。

我需要提取的是一对 food_name 及其 category_name 。

提前感谢您的帮助。

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...
}

在neo4j发送查询[JAVA]

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