Neo4j创建自动索引

一、创建Neo4j的Legacy indexing

1.为节点创建索引

官方API的创建示例为：

将一节点添加至索引：

public static void AddNodeIndex(String nid)
    {
        String txUri=SERVER_ROOT_URI+"index/node/favorites";
        WebResource resource = Client.create().resource(txUri);
        String entity="{\"value\" : \"n204\",\"uri\" : \"http://192.168.209.128:7474/db/data/node/"+nid+"\",\"key\" : \"n201\"}";
        ClientResponse response = resource.accept(MediaType.APPLICATION_JSON)
                .type(MediaType.APPLICATION_JSON).entity(entity)
                .post(ClientResponse.class);

        System.out.println(response.getStatus());
        System.out.println(response.getEntity(String.class));
        response.close();
    }

ps:nid是要添加索引的节点ID  value是索引值  key是索引名称

2.通过属性查找节点

public static void GetNodeByIndex()
    {
        String txUri=SERVER_ROOT_URI+"index/node/favorites/n201/n201";
        WebResource resource = Client.create().resource(txUri);
       
        ClientResponse response = resource.accept(MediaType.APPLICATION_JSON)
                .type(MediaType.APPLICATION_JSON)
                .get(ClientResponse.class);

        System.out.println(response.getStatus());
        System.out.println(response.getEntity(String.class));
        response.close();
    }

txUri路径中：favorites为刚创建的索引名称，第一个n201是节点索引key，第二个n201是节点索引值

二、自动创建索引（Legacy Automatic Indexes）

What default configuration means depends on how you have configured your database. If you haven’t

changed any indexing configuration, it means the indexes will be using a Lucene-based backend.

数据库配置之后，就可以自动创建索引

1.配置文件配置

Auto-indexing must be enabled through configuration before we can create or configure them. Firstly

ensure that you’ve added some config like this into your server’s conf/neo4j.properties file:

打开conf/neo4j.properties文件如图

配置下面的节点

# Enable auto-indexing for nodes, default is false.
node_auto_indexing=true

# The node property keys to be auto-indexed, if enabled.
node_keys_indexable=name,ki

# Enable auto-indexing for relationships, default is false.
relationship_auto_indexing=true

# The relationship property keys to be auto-indexed, if enabled.
relationship_keys_indexable=name,ki

Node_keys_indexable、relationship_keys_indexable对应节点、关系的属性

配置完成之后重启服务

重启三个节点的集群

2。测试索引

插入一个节点和关系

// 创建节点
    @Test
    public void test2() {
        URI uri = CreateSimpleGraph.createNode();
        CreateSimpleGraph.addProperty(uri, "name", "张三");
        URI uri1 = CreateSimpleGraph.createNode();
        CreateSimpleGraph.addProperty(uri1, "name", "李四");
    }
// 为节点设置关系
    @Test
    public void test6() {
        for (int i = 1; i < 2; i++) {
            try {
                URI suri = new URI("http://192.168.209.128:7474/db/data/node/171391");
                String uri1="http://192.168.209.128:7474/db/data/node/";
                URI euri = new URI("http://192.168.209.128:7474/db/data/node/171392");
                URI reluri= CreateSimpleGraph.addRelationship(suri, euri, "家人","{\"ki\" : \"1234567890\", \"name\" : \"无\" }");
                System.out.println(reluri);
            } catch (URISyntaxException e) {
                // 异常信息输出该内容
                e.printStackTrace();
            }
        }
    }

3.通过属性查找节点

public static void GetNodeByAutoIndex(String ki)
    {
//        String txUri=SERVER_ROOT_URI+"index/node/node_auto_index/name/"+ki;
        String txUri=SERVER_ROOT_URI+"index/auto/node/ki/"+ki;
        WebResource resource = Client.create().resource(txUri);
       
        ClientResponse response = resource.accept(MediaType.APPLICATION_JSON)
                .type(MediaType.APPLICATION_JSON)
                .get(ClientResponse.class);

        System.out.println(response.getStatus());
        System.out.println(response.getEntity(String.class));
        response.close();
    }
   
    public static void GetRelationshipByAutoIndex(String ki)
    {
//        String txUri=SERVER_ROOT_URI+"index/node/node_auto_index/name/"+ki;
        String txUri=SERVER_ROOT_URI+"index/auto/relationship/ki/"+ki;
        WebResource resource = Client.create().resource(txUri);
       
        ClientResponse response = resource.accept(MediaType.APPLICATION_JSON)
                .type(MediaType.APPLICATION_JSON)
                .get(ClientResponse.class);

        System.out.println(response.getStatus());
        System.out.println(response.getEntity(String.class));
        response.close();
    }

关系的输出结果为：

[ {
  "extensions" : { },
  "metadata" : {
    "id" : 337,
    "type" : "家人"
  },
  "data" : {
    "name" : "无",
    "ki" : "1234567890"
  },
  "property" : "http://192.168.209.128:7474/db/data/relationship/337/properties/{key}",
  "start" : "http://192.168.209.128:7474/db/data/node/171391",
  "self" : "http://192.168.209.128:7474/db/data/relationship/337",
  "end" : "http://192.168.209.128:7474/db/data/node/171392",
  "type" : "家人",
  "properties" : "http://192.168.209.128:7474/db/data/relationship/337/properties"
} ]

这里说明一下，传值为中文的时候，查询不出来，可能需要编码，因为工作暂时没有用到，就没有再研究了

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