标签:USERNAME 手动 private 索引 static KEY neo4j import 节点
package com.fly.demo;
import org.neo4j.graphdb.GraphDatabaseService;
import org.neo4j.graphdb.Node;
import org.neo4j.graphdb.Transaction;
import org.neo4j.graphdb.factory.GraphDatabaseFactory;
import org.neo4j.graphdb.index.Index;
import org.neo4j.io.fs.FileUtils;
import java.io.File;
import java.io.IOException;
/**
* 节点属性 手动索引
*/
public class ManualIndex {
private static final File DB_PATH = new File("demo/neo4j-db");
private static final String USERNAME_KEY = "name";
private static GraphDatabaseService graphDb;
private static Index<Node> nodeIndex;
public static void main(String... args) throws IOException {
FileUtils.deleteRecursively(DB_PATH);
graphDb = new GraphDatabaseFactory().newEmbeddedDatabase(DB_PATH);
registerShutdownHook();
try (Transaction tx = graphDb.beginTx()) {
nodeIndex = graphDb.index().forNodes("nodes");
for (int id = 0; id < 100; id++) {
createAndIndexUser(idToUserName(id));
}
int idToFind = 45;
String userName = idToUserName(idToFind);
Node foundUser = nodeIndex.get(USERNAME_KEY, userName).getSingle();
System.out.println("The name of user " + idToFind + " is "
+ foundUser.getProperty(USERNAME_KEY));
// * 通配符查询所有节点
for (Node user : nodeIndex.query(USERNAME_KEY, "*")) {
nodeIndex.remove(user, USERNAME_KEY, user.getProperties(USERNAME_KEY));
user.delete();
}
tx.success();
}
shutdown();
}
private static Node createAndIndexUser(final String userName) {
Node node = graphDb.createNode();
node.setProperty(USERNAME_KEY, userName);
nodeIndex.add(node, USERNAME_KEY, userName);
return node;
}
private static String idToUserName(final int id) {
return "user" + id;
}
private static void shutdown() {
graphDb.shutdown();
}
private static void registerShutdownHook() {
Runtime.getRuntime().addShutdownHook(new Thread(ManualIndex::shutdown));
}
}
标签:USERNAME,手动,private,索引,static,KEY,neo4j,import,节点 来源: https://www.cnblogs.com/fly-book/p/16065613.html
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