摘要：更新的自動生成方式在結合使用的情況下當通過創(chuàng)建節(jié)點的時候無法返回節(jié)點的因為其是作為事務回調異步中生成的無法同步返回該方式已經被的生成策略替代我們知道的內部是會重用的因此無法使用其作為業(yè)務對象的唯一標識因此我們在這里給對象自動添加屬性作為

更新: 2018-04-21
GraphAware 的UUID自動生成方式在結合Spring Data Neo4j使用的情況下, 當通過Neo4jRepository.save()創(chuàng)建節(jié)點的時候, 無法返回節(jié)點的UUID. 因為其UUID是作為事務回調(異步)中生成的, 無法同步返回. 
該方式已經被Spring Data Neo4j 5.0的ID生成策略(UuidStrategy)替代.

import lombok.Getter;
import lombok.NonNull;
import lombok.Setter;
import org.neo4j.ogm.annotation.GeneratedValue;
import org.neo4j.ogm.annotation.Id;
import org.neo4j.ogm.annotation.NodeEntity;
import org.neo4j.ogm.annotation.typeconversion.Convert;
import org.neo4j.ogm.id.UuidStrategy;
import org.neo4j.ogm.typeconversion.UuidStringConverter;

import java.util.UUID;

@NodeEntity
@Getter
@Setter
public class User {
    @Id
    @GeneratedValue(strategy = UuidStrategy.class)
    @Convert(UuidStringConverter.class)
    @NonNull
    private UUID id;
}

我們知道Neo4j的內部ID是會重用的, 因此無法使用其作為業(yè)務對象的唯一標識. 因此我們在這里給對象自動添加"uuid"屬性作為唯一標識.

需要 GraphAware Neo4j Framework 和 GraphAware Neo4j UUID 兩個jar包, 下載地址:

下載頁面
https://graphaware.com/produc...

框架庫
http://products.graphaware.co...
UUID庫
http://products.graphaware.co...

保證 graphaware-server-community-all-3.3.2.51.jar 和 graphaware-uuid-3.3.2.51.14.jar 兩個庫存在于 Neo4j 安裝目錄的 plugins 子目錄之下. 并重啟 Neo4j 服務器.

在conf/neo4j.conf配置文件中添加如下設置:

com.graphaware.runtime.enabled=true

#UIDM becomes the module ID:
com.graphaware.module.UIDM.1=com.graphaware.module.uuid.UuidBootstrapper

#optional, default is uuid:
com.graphaware.module.UIDM.uuidProperty=uuid

#optional, default is false:
com.graphaware.module.UIDM.stripHyphens=false

#optional, default is all nodes:
#com.graphaware.module.UIDM.node=hasLabel("Label1") || hasLabel("Label2")

#optional, default is no relationships:
#com.graphaware.module.UIDM.relationship=isType("Type1")
#com.graphaware.module.UIDM.relationship=com.graphaware.runtime.policy.all.IncludeAllBusinessRelationships

#optional, default is uuidIndex
com.graphaware.module.UIDM.uuidIndex=uuidIndex

#optional, default is uuidRelIndex
com.graphaware.module.UIDM.uuidRelationshipIndex=uuidRelIndex

  com.graphaware.neo4j
  runtime
  LATEST


  com.graphaware.neo4j
  uuid
  3.3.2.51.14

然后在程序中如下使用

dbms.logs.debug.level=DEBUG
com.graphaware.runtime.enabled=true
com.graphaware.module.UIDM.1=com.graphaware.module.uuid.UuidBootstrapper
com.graphaware.module.UIDM.uuidProperty=uuid
com.graphaware.module.UIDM.stripHyphens=false
com.graphaware.module.UIDM.uuidIndex=uuidIndex
com.graphaware.module.UIDM.uuidRelationshipIndex=uuidRelIndex

public void init() throws Exception {}
  graphDb = new GraphDatabaseFactory()
      .newEmbeddedDatabaseBuilder(DATABASE_DIRECTORY)
      .setConfig(GraphDatabaseSettings.pagecache_memory, "512M")
      .setConfig(GraphDatabaseSettings.string_block_size, "60")
      .setConfig(GraphDatabaseSettings.array_block_size, "300")
      .setConfig(GraphDatabaseSettings.store_internal_log_level, "DEBUG")
      .loadPropertiesFromFile(path.toAbsolutePath().toString())
      .setConfig(bolt.enabled, "true")
      .setConfig(bolt.type, "BOLT")
      .setConfig(bolt.listen_address, "0.0.0.0:7687")
      .setConfig(bolt.encryption_level, BoltConnector.EncryptionLevel.OPTIONAL.toString())
      .setConfig(ShellSettings.remote_shell_enabled, Settings.TRUE)
      .newGraphDatabase();

  registerFunction(graphDb, ga.uuid.NodeUuidFunctions.class);
  registerFunction(graphDb, ga.uuid.RelationshipUuidFunctions.class);
  Util.registerShutdownHook(graphDb);

  GraphAwareRuntime runtime = GraphAwareRuntimeFactory.createRuntime(database);  // database 是一個 GraphDatabaseService 實例
  UuidModule module = new UuidModule("UUIDM", UuidConfiguration.defaultConfiguration());
  runtime.registerModule(module);
  runtime.start();
}
/**
 * 注冊用戶定義函數(shù)
 *
 * @param db
 * @param procedures
 * @throws KernelException
 */
public static void registerFunction(GraphDatabaseService db, Class... procedures) throws KernelException {
    Procedures proceduresService = ((GraphDatabaseAPI) db).getDependencyResolver().resolveDependency(Procedures.class);
    for (Class procedure : procedures) {
        log.info("=== register function: {}", procedure.toString());
        proceduresService.registerFunction(procedure);
    }
}

https://github.com/graphaware...