【本田xrv怎么放mv】neo4j图数据库安装、报错解决与简单实践使用分析

在图片数据库领域，neo4j应该使用得很广泛。之前研究生期间安装了这个数据库，后来换了电脑也不肯用。今天想重新安装在桌面上。

数据库下载地址在

打开后下载我红色线框圈出来的版本即可：

就是社区版【免费】的windows版本就行了。下载好了以后直接解压缩即可，如下：

类似java环境变量配置，新建Neo4j_HOME变量，变量值即为neo4j-communi所在的路径，之后再系统的path中将bin所在的路径加入到path中，这样就完成了环境变量的配置处理。

接下来启动neo4j,启动命令如下：

neo4j.bat console

本地启动直接报错了，报错信息如下：

查阅网上的资料找到一个解决方案是：

Set-ExecutionPolicy -ExecutionPolicy RemoteSigned
Import-Module '（neo4j文件目录）binNeo4j-Management.psd1'
Invoke-Neo4j console

亲测不可行，报错如下：

可能是我使用有误，也可能是报错并非这种方式可以解决的。

下面开始分析上面的错误，其实错误的意思大概就是：

中的什么路径没有找到，那么我们就进入到bin目录下打开这个文件，文件内容如下：

# Copyright (c) 2002-2018 "Neo4j,"
# Neo4j Sweden AB []
#
# This file is part of Neo4j.
#
# Neo4j is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <;.

try
{
Unblock-File -Path '%~dp0Neo4j-Management*.*' -ErrorAction 'SilentlyContinue'
}
catch
{
};

Import-Module "$PSScriptRootNeo4j-Management.psd1"
$Arguments = Get-Args $args
Exit (Invoke-Neo4j -Verbose:$Argumen -Command $Argumen)

# SIG # Begin signature block
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# QJC6mSo=
# SIG # End signature block

从上面的内容和启动命令的报错输出结合来看，我们很容易定位到这里：

就是这里的路径除了问题，我并不知道“$PSScriptRoot”这个变量代表的什么意思，感觉有点像环境变量配置里面的NEO4J_HOME一样，既然想到了这里，我就修改了这个相关值为绝对路径值，修改后整个文件内容如下：

# Copyright (c) 2002-2018 "Neo4j,"
# Neo4j Sweden AB []
#
# This file is part of Neo4j.
#
# Neo4j is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <;.

try
{
Unblock-File -Path '%~dp0Neo4j-Management*.*' -ErrorAction 'SilentlyContinue'
}
catch
{
};

Import-Module "D:neo4jneo4j-communibinNeo4j-Management.psd1"
$Arguments = Get-Args $args
Exit (Invoke-Neo4j -Verbose:$Argumen -Command $Argumen)

# SIG # Begin signature block
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保存退出之后，重新启动数据库，结果输出如下：

可以看到，neo4j数据库已经成功启动了，到此，算是环境配置结束了。

到这里安装过程就结束了，Python中提供了操作neo4j数据库的模块py2neo 可以很方便地进行图数据库的使用，下面进行简单的使用分析：

#!usr/bin/env python
# encoding:utf-8
from __future__ import division

"""
__Author__:沂水寒城
功能： Python操作neo4j实践图数据库使用
"""

import os
import sys
import json
from py2neo import Graph,Node,Relationship

reload(sys)
('utf-8')

##连接neo4j数据库
graph=Graph(
'http://localhost:7474',
username='neo4j',
password='neo4j'
)
#清除图数据
gra()
#创建结点
with open('da;) as f:
data_list=[one.strip().split('###') for one in f.readlines() if one]
have_list=[]
node_list=[]
map_dict={}
for one_relation in data_list:
P1,P2,relation,weight=one_relation
if P1 not in have_list:
(P1)
one_node=Node('sougou',name=P1)
node_li(one_node)
map_dict[P1]=one_node
if P2 not in have_list:
(P2)
one_node=Node('sougou',name=P2)
node_li(one_node)
map_dict[P2]=one_node

for one_node in node_list:
gra(one_node)

#创建关系
for one_relation in data_list:
P1,P2,relation,weight=one_relation
one_link=Relationship(map_dict[P1],relation,map_dict[P2])
one_link['count']=weight
gra(one_link)

print(graph)

使用到的部分数据截图如下所示，都是人物关系数据：

运行结束后，打开浏览器，输入：http://localhost:7474 回车就可以查看图数据库里面的数据了，部分数据截图如下：

neo4j数据库中部分数据库类型截图如下所示：

初步使用，感觉知识图谱如果做得足够好，是非常有希望超过AI所能达到的效果的。