将参数传递给neo4j cypher查询

Question

我有一个用于连接neo4j的java程序。希望传递参数，该参数是用户给cypher查询赋予的变量值。

    void connect() {

    graphDataService = new GraphDatabaseFactory().newEmbeddedDatabase(DB_PATH);
    Transaction transaction = graphDataService.beginTx();

    String name = "";

    Scanner sc_name = new Scanner(System.in);
    System.out.println("enter name : ");
    name=sc_name.next();

    try {
        ExecutionEngine engine = new ExecutionEngine(graphDataService);
        ExecutionResult result = engine.execute("START n = node(*) where n.nodename = ? return n");
        System.out.println(result.dumpToString());
        transaction.success();
    }

    finally {
        transaction.finish();
    }
}

如何连接将替换？的变量名称中的值并获取结果。有什么想法吗？

Answer 1

您可以执行以下操作：

import org.neo4j.helpers.collection.MapUtil;
...
ExecutionResult result = engine.execute("START n=node(*) WHERE n.nodename={name}, return n", MapUtil.map("name", "value");