环境搭建
mac brew安装方式
代码语言：javascript复制brew install neo4j
==> Downloading https://neo4j.com/artifact.php?name=neo4j-community-3.3.4-unix.tar.gz
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==> Caveats
To have launchd start neo4j now and restart at login:
brew services start neo4j
Or, if you don't want/need a background service you can just run:
neo4j start
==> Summary
? /usr/local/Cellar/neo4j/3.3.4: 105 files, 99MB, built in 2 minutes 31 seconds启动neo4j
代码语言：javascript复制neo4j start
Active database: graph.db
Directories in use:
home: /usr/local/Cellar/neo4j/3.3.4/libexec
config: /usr/local/Cellar/neo4j/3.3.4/libexec/conf
logs: /usr/local/Cellar/neo4j/3.3.4/libexec/logs
plugins: /usr/local/Cellar/neo4j/3.3.4/libexec/plugins
import: /usr/local/Cellar/neo4j/3.3.4/libexec/import
data: /usr/local/Cellar/neo4j/3.3.4/libexec/data
certificates: /usr/local/Cellar/neo4j/3.3.4/libexec/certificates
run: /usr/local/Cellar/neo4j/3.3.4/libexec/run
Starting Neo4j.
Started neo4j (pid 6301). It is available at http://localhost:7474/
There may be a short delay until the server is ready.
See /usr/local/Cellar/neo4j/3.3.4/libexec/logs/neo4j.log for current status.首次登陆的默认密码是:neo4j
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简介
Neo4j是基于属性图模型（Property Graph Model）的数据库
Nodes节点
节点可以想象成图中的对象，节点包含属性，属性可以是任何键值对的形式存储，节点可以有一个或多个标签，也可以没有标签，标签把节点组织在一起。
Relationships关系
关系使用类型 和方向 将节点连结起来，在Neo4j中，关系必须是有向的，一个关系只连接两个节点。关系必须而且只能有一个类型
