java - Orientdb:创建新的图形数据库

Question

我正在尝试创建一个新的 OrientGraph 数据库实例，如下所示:

OrientGraph graph = new OrientGraph("local:C:/temp/graph/db");
graph.create(); //BUT no create method!!

无论如何，在坚持使用手册的同时使用 ODatabaseDocumentTx 进行操作，例如:

db = new ODatabaseDocumentTx("plocal:c:/orientdb/db");
db.create();
....
db.shutdown();

然后我想获得这样的 session :

OrientGraphFactory factory = new OrientGraphFactory("plocal:c:/orientdb/db", "admin", "admin");
OrientGraphNoTx g = factory.getNoTx();
try
{

}
finally
{
    g.shutdown();
}

我得到以下异常:

java.lang.IncompatibleClassChangeError: Expected static method     com.tinkerpop.blueprints.impls.orient.OrientBaseGraph.checkForGraphSchema(Lcom/orientechnologies/orient/core/db/document/ODatabaseDocumentTx;)

如何创建新的图形数据库？？？

谢谢。

Answer 1

首先，您不应再使用“本地”引擎，它已被弃用(您的第一个示例)。其次，必须清楚地记录必须创建 OrientGraph 的方式，请参阅 http://www.orientechnologies.com/docs/last/orientdb.wiki/Graph-Factory.html

应该工作的完整示例:

@Test
public void testNoTx() {
    // start with a non existing database
    final OrientGraphFactory factory = new OrientGraphFactory(
        "plocal:" + DB_DIR, "admin", "admin");
    assertFalse(factory.exists());        
    try {
        OrientGraphNoTx g = factory.getNoTx();
        // database is auto created
        assertFalse(g.isClosed());
        assertFalse(g.isRequireTransaction());
    } finally {
        // this also closes the OrientGraph instances created by the factory
        // Note that OrientGraphFactory does not implement Closeable
        factory.close();
    }
}

最后，您报告的错误表明存在一组不一致的 jar 文件。你应该:

• 使用 Java 6+(版本 < 2.x)或 7+(版本 >= 2.x，未记录)
• 使用这里提到的 jar :http://www.orientechnologies.com/docs/last/orientdb.wiki/Graph-Database-Tinkerpop.html 来自 OrientDB(OrientDB 使用修改 tinkerpop 实现)。最好是使用 maven :)

需要的依赖:

- com.orientechnologies:orientdb-graphdb:jar:2.0-M2:compile
  +- com.orientechnologies:orientdb-core:jar:2.0-M2:compile
  |  +- org.xerial.snappy:snappy-java:jar:1.1.0.1:compile
  |  +- com.googlecode.concurrentlinkedhashmap:concurrentlinkedhashmap-  lru:jar:1.4:compile
  |  +- net.java.dev.jna:jna:jar:4.0.0:compile
  |  \- net.java.dev.jna:jna-platform:jar:4.0.0:compile
  \- com.tinkerpop.blueprints:blueprints-core:jar:2.6.0:compile
     +- com.fasterxml.jackson.core:jackson-databind:jar:2.2.3:compile
     |  +- com.fasterxml.jackson.core:jackson-annotations:jar:2.2.3:compile
     |  \- com.fasterxml.jackson.core:jackson-core:jar:2.2.3:compile
     +- com.carrotsearch:hppc:jar:0.6.0:compile
     \- commons-configuration:commons-configuration:jar:1.6:compile
        +- commons-collections:commons-collections:jar:3.2.1:compile
        +- commons-lang:commons-lang:jar:2.4:compile
        +- commons-digester:commons-digester:jar:1.8:compile
        |  \- commons-beanutils:commons-beanutils:jar:1.7.0:compile
        \- commons-beanutils:commons-beanutils-core:jar:1.8.0:compile

更新:

有关完整示例，请参阅 https://github.com/rmuller/graphdb-playground (在“orientdb-embedded-graph”下)