如何让 RStudio 连接到 Neo4j 数据库?
问题:
当我尝试使用startGraph通过 RStudio 连接到 neo4j 数据库时,会显示以下错误:
错误: 服务器错误:(503)服务不可用
#load library
library(RNeo4j)
#connect to graphdb
graph = startGraph("http://localhost:7474/db/data/")
(禁用 dbm 身份验证 [dbms.security.auth_enabled=false])(还尝试启用身份验证(通过将 db 用户名和密码传递给 startGraph),但显示相同的错误)
graph = startGraph("http://localhost:7474/db/data",
username="xxxx", password="xxxx")
初始设置检查:
确认 Neo4j 安装和运行成功。
1.Database is started and running successfully via neo4j (3.0.1) console
2.Confirmed able to connect successfully via Chrome Browser
3.Confirmed able to create graph and conduct queries via Chrome Browser interface.
环境信息
proxy is configured on system
RNeo4j version 1.6.4
RStudio V. 0.99.892
R version 3.2.4 (2016-03-10)
Platform: x86_64-w64-mingw32/x64 (64-bit)
Running under: Windows 7 x64 (build 7601) Service Pack 1
额外细节
我对代理和 RStudio 创建和运行 Shiny Apps 或在系统上安装任何 R 包没有任何问题。
我执行了一个 netstat 来检查 localhost 端口上的连接,只有连接的应用程序是 Neo4j 和 Web 浏览器,而不是 RStudio。(一次打开这么多连接正常吗?)
d:\Windows\System32\drivers\etc>netstat -a -o -n |grep :7474
TCP 127.0.0.1:7474 0.0.0.0:0 LISTENING 15528
TCP 127.0.0.1:7474 127.0.0.1:50884 TIME_WAIT 0
TCP 127.0.0.1:7474 127.0.0.1:50885 TIME_WAIT 0
TCP 127.0.0.1:7474 127.0.0.1:50886 TIME_WAIT 0
TCP 127.0.0.1:7474 127.0.0.1:50888 TIME_WAIT 0
TCP 127.0.0.1:7474 127.0.0.1:50889 TIME_WAIT 0
TCP 127.0.0.1:7474 127.0.0.1:50898 TIME_WAIT 0
TCP 127.0.0.1:7474 127.0.0.1:50899 TIME_WAIT 0
TCP 127.0.0.1:7474 127.0.0.1:50913 ESTABLISHED 15528
TCP 127.0.0.1:7474 127.0.0.1:50914 ESTABLISHED 15528
TCP 127.0.0.1:7474 127.0.0.1:50915 ESTABLISHED 15528
TCP 127.0.0.1:7474 127.0.0.1:50916 ESTABLISHED 15528
TCP 127.0.0.1:7474 127.0.0.1:50917 ESTABLISHED 15528
TCP 127.0.0.1:7474 127.0.0.1:50918 ESTABLISHED 15528
TCP 127.0.0.1:50887 127.0.0.1:7474 TIME_WAIT 0
TCP 127.0.0.1:50900 127.0.0.1:7474 TIME_WAIT 0
TCP 127.0.0.1:50901 127.0.0.1:7474 TIME_WAIT 0
TCP 127.0.0.1:50902 127.0.0.1:7474 TIME_WAIT 0
TCP 127.0.0.1:50913 127.0.0.1:7474 ESTABLISHED 12356
TCP 127.0.0.1:50914 127.0.0.1:7474 ESTABLISHED 12356
TCP 127.0.0.1:50915 127.0.0.1:7474 ESTABLISHED 12356
TCP 127.0.0.1:50916 127.0.0.1:7474 ESTABLISHED 12356
TCP 127.0.0.1:50917 127.0.0.1:7474 ESTABLISHED 12356
TCP 127.0.0.1:50918 127.0.0.1:7474 ESTABLISHED 12356