neo4j
-- 创建节点语句CREATE (
:
{
:
........
:
}
);
其中的node-name 是节点名称
label-name 是标签名称
propert1-name是属性名称和property-value是属性值
例如
单节点单标签
create (p:Person{name:"alicy"});
create (p:Person{name:"Tom", sex:"男"});
https://img2023.cnblogs.com/blog/3306499/202311/3306499-20231129141357460-1602773755.png
单节点多标签
CREATE (m:Movie:Cinema:Film:Picture)
https://img2023.cnblogs.com/blog/3306499/202311/3306499-20231129141341059-1255495751.png
-- match 语法
方法一：match (x:Person{name:"Tom"}) return x;
方法二：
match (p:Person)
where p.name="Tom"
return p;
这两种是等价的，都是查找到Person下的名字叫Tom的节点
https://img2023.cnblogs.com/blog/3306499/202311/3306499-20231129141440676-1267441676.png
返回特定节点的特定属性
返回名字叫Tom的性别属性：
match (p:Person{name:"Tom"}) return p.sex;
https://img2023.cnblogs.com/blog/3306499/202311/3306499-20231129141501187-1382484157.png
创建单标签到关系
关系都是有方向的，从开始到结束
CREATE (<node1-name>:<label1-name>)-
[<relationship-name>:<relationship-label-name>]
->(<node2-name>:<label2-name>)<br>node1-name:是from的节点名称、label1-name是标签名称node2-name:是to的节点名称 label2-name是标签名称relationship-name:关系名称relationship-label-name：关系标签名称为alicy和Tom创建恋人关系match(a:Person{name:"alicy"}),(b:Person{name:"Tom"}) create (a) -->(b);match(a:Person{name:"Tom"}),(b:Person{name:"alicy"}) create (a) -->(b);相当于查出alicy和Tom，并分别叫上别名a,b ，为a,b建立关系
https://img2023.cnblogs.com/blog/3306499/202311/3306499-20231129144145719-518245582.png
-- 移除关系，让alicy变心
match(a:Person{name:"alicy"})-->(b:Person{name:"Tom"}) delete lv;https://img2023.cnblogs.com/blog/3306499/202311/3306499-20231129144726123-2005117209.png
-- alicy 爱上了laowang
match(a:Person{name:"alicy"}),(b:Person{name:"LaoWang"})
create (a)
-
->(b);
https://img2023.cnblogs.com/blog/3306499/202311/3306499-20231129145213275-2071542546.png
-- Tom 发现后自动解除关系，并退出match(a:Person{name:"Tom"})-->(b:Person{name:"alicy"})delete a,lv; https://img2023.cnblogs.com/blog/3306499/202311/3306499-20231129145613006-1055524843.png -- 删除节点
match (a:Movie) delete a;-- 删除Tom节点以及它的所有关系match (p:Person{name:'Tom'}) --(m) delete p,lv; -- 为alicy 添加性别属性match (p:Person{name:"alicy"}) set p.sex='女' return p;match (p:Person{name:"alicy"}) set p.job='主播' return p;https://img2023.cnblogs.com/blog/3306499/202311/3306499-20231129191256890-1887293967.png
-- 把alicy的职业移除match (p:Person{name:"alicy"}) remove p.job return p;https://img2023.cnblogs.com/blog/3306499/202311/3306499-20231129191247948-1212902347.png
-- 按照名字排序
match (p:Person) return p.name ORDER BY p.name desc;https://img2023.cnblogs.com/blog/3306499/202311/3306499-20231129191323117-935162411.png
-- union
match (a:Person{name:"alicy"})return a.name union all match(b:Person{name:"Tom"}) return b.name; 这种写法是不行的https://img2023.cnblogs.com/blog/3306499/202311/3306499-20231129191852100-1236939928.png
从报错中可以得到必须要相同的列名，虽然我们看着相同，但是编辑器不认识，所以加上一个别名
match (a:Person{name:"alicy"}) return a.name as name union all match(b:Person{name:"Tom"}) return b.name as name; https://img2023.cnblogs.com/blog/3306499/202311/3306499-20231129192526276-1450969597.png
-- limit
match (a:Person) return a LIMIT 1; https://img2023.cnblogs.com/blog/3306499/202311/3306499-20231129192737265-191987166.png -- skipmatch (a:Person) return a skip 1;
https://img2023.cnblogs.com/blog/3306499/202311/3306499-20231129192942205-199934873.png
从结果看alicy被跳过去了
-- merge 语法 无则添加有则不动match(a:Person{name:"Tom"}),(b:Person{name:"LaoWang"}) merge (a)-->(b) return a, b ; -- 加上唯一约束
CREATE CONSTRAINT ON (n:Person) ASSERT n.name IS UNIQUE;https://img2023.cnblogs.com/blog/3306499/202311/3306499-20231129200246332-619897540.png
-- in 语句不能使用（）而是[]
match(p:Person) where p.name in ["Tom","test"] return p;
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