执行 Neo4j Cypher Query (by Java) 嵌入模式时出错

Question

我在 java 中执行 Cypher 查询时出错（嵌入式模式）这是我的代码：

    import org.neo4j.cypher.internal.ExecutionEngine;
    import org.neo4j.cypher.internal.ExecutionResult;
    import org.neo4j.graphdb.GraphDatabaseService;
    import org.neo4j.graphdb.factory.GraphDatabaseFactory;
    public class test {
    public static void main(String[] args) {
    GraphDatabaseFactory graphdbFactory = new GraphDatabaseFactory();
    GraphDatabaseService graphdb = new graphdbFactory.newEmbeddedDatabase("C:/Users/dell/Documents/Neo4j");    
    ExecutionEngine execEngine = new ExecutionEngine(graphDb);
    ExecutionResult execResult = execEngine.execute
               ("MATCH (java:JAVA) RETURN java");
    String results = execResult.dumpToString();
    System.out.println(results);
}

}

我在以下行收到错误：GraphDatabaseService graphdb = new graphdbFactory.newEmbeddedDatabase("C:/Users/dell/Documents/Neo4j"); 错误：类型图形数据库工厂中的新嵌入式数据库（文件）方法不适用于参数（字符串）

请帮忙

Answer 1

GraphDatabaseFactory.newEmbeddedDatabase() 需要 File 而不是 String，参见 http://neo4j.com/docs/java-reference/current/javadocs/org/neo4j/graphdb/factory/GraphDatabaseFactory.html#newEmbeddedDatabase-java.io.File-

也没有必要使用ExecutionEngine。就做一个graphDb.execute(<cypherString>)。注意这适用于 Neo4j >= 2.3.

Answer 2

下面的代码应该可以解决这个问题。

文件存储文件=新文件("C:/Users/dell/Documents/Neo4j");

GraphDatabaseService db= dbFactory.newEmbeddedDatabase(storeFile);

执行 Neo4j Cypher Query (by Java) 嵌入模式时出错

Error in Executing Neo4j Cypher Query (by Java) embedded mode

java

neo4j

graph-databases