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0.4 版本对顶点 Id 做了比较大的改动，VertexLabel 中的 Id 策略决定了顶点的 Id 类型，其对应关系如下：
| Id_Strategy | id type |
|---|---|
| AUTOMATIC | number |
| PRIMARY_KEY | string |
| CUSTOMIZE_STRING | string |
| CUSTOMIZE_NUMBER | number |
顶点的GET/PUT/DELETE API中url的 id 部分传入的应是带有类型信息的id值，这个类型信息用 json 串是否带引号表示，也就是说：
- 当 id 类型为 number 时，url 中的 id 不带引号，形如 xxx/vertices/123456
- 当 id 类型为 string 时，url 中的 id 带引号，形如 xxx/vertices/“123456”
接下来的示例均假设已经创建好了前述的各种schema信息
2.1.1 创建一个顶点
Method & Url
POST http://localhost:8080/graphs/hugegraph/graph/vertices
Request Body
{"label": "person","properties": {"name": "marko","age": 29}}
Response Status
201
Response Body
{"id": "1:marko","label": "person","type": "vertex","properties": {"name": [{"id": "1:marko>name","value": "marko"}],"age": [{"id": "1:marko>age","value": 29}]}}
2.1.2 创建多个顶点
Method & Url
POST http://localhost:8080/graphs/hugegraph/graph/vertices/batch
Request Body
[{"label": "person","properties": {"name": "marko","age": 29}},{"label": "software","properties": {"name": "ripple","lang": "java","price": 199}}]
Response Status
201
Response Body
["1:marko","2:ripple"]
2.1.3 更新顶点属性
Method & Url
PUT http://127.0.0.1:8080/graphs/hugegraph/graph/vertices/"1:marko"?action=append
Request Body
{"label": "person","properties": {"age": 30,"city": "Beijing"}}
注意：属性的取值是有三种类别的，分别是single、set和list。如果是single，表示增加或更新属性值；如果是set或list，则表示追加属性值。
Response Status
200
Response Body
{"id": "1:marko","label": "person","type": "vertex","properties": {"city": [{"id": "1:marko>city","value": "Beijing"}],"name": [{"id": "1:marko>name","value": "marko"}],"age": [{"id": "1:marko>age","value": 30}]}}
2.1.4 批量更新顶点属性
功能说明
批量更新顶点的属性，并支持多种更新策略，包括
- SUM: 数值累加
- BIGGER: 两个数字/日期取更大的
- SMALLER: 两个数字/日期取更小的
- UNION: Set属性取并集
- INTERSECTION: Set属性取交集
- APPEND: List属性追加元素
- ELIMINATE: List/Set属性删除元素
- OVERRIDE: 覆盖已有属性，如果新属性为null，则仍然使用旧属性
假设原顶点及属性为：
{"vertices":[{"id":"2:lop","label":"software","type":"vertex","properties":{"name":"lop","lang":"java","price":328}},{"id":"1:josh","label":"person","type":"vertex","properties":{"name":"josh","age":32,"city":"Beijing","weight":0.1,"hobby":["reading","football"]}}]}
Method & Url
PUT http://127.0.0.1:8080/graphs/hugegraph/graph/vertices/batch
Request Body
{"vertices":[{"label":"software","type":"vertex","properties":{"name":"lop","lang":"c++","price":299}},{"label":"person","type":"vertex","properties":{"name":"josh","city":"Shanghai","weight":0.2,"hobby":["swiming"]}}],"update_strategies":{"price":"BIGGER","age":"OVERRIDE","city":"OVERRIDE","weight":"SUM","hobby":"UNION"},"create_if_not_exist":true}
Response Status
200
Response Body
{"vertices": [{"id": "2:lop","label": "software","type": "vertex","properties": {"name": "lop","lang": "c++","price": 328}},{"id": "1:josh","label": "person","type": "vertex","properties": {"name": "josh","age": 32,"city": "Shanghai","weight": 0.3,"hobby": ["swiming","reading","football"]}}]}
结果分析：
- lang 属性未指定更新策略，直接用新值覆盖旧值，无论新值是否为null；
- price 属性指定 BIGGER 的更新策略，旧属性值为328，新属性值为299，所以仍然保留了旧属性值328；
- age 属性指定 OVERRIDE 更新策略，而新属性值中未传入age，相当于age为null，所以仍然保留了原属性值32；
- city 属性也指定了 OVERRIDE 更新策略，且新属性值不为null，所以覆盖了旧值；
- weight 属性指定了 SUM 更新策略，旧属性值为0.1，新属性值为0.2，最后的值为0.3；
- hobby 属性（基数为Set）指定了 UNION 更新策略，所以新值与旧值取了并集；
其他的更新策略使用方式可以类推，不再赘述。
2.1.5 删除顶点属性
Method & Url
PUT http://127.0.0.1:8080/graphs/hugegraph/graph/vertices/"1:marko"?action=eliminate
Request Body
{"label": "person","properties": {"city": "Beijing"}}
注意：这里会直接删除属性（删除key和所有value），无论其属性的取值是single、set或list。
Response Status
200
Response Body
{"id": "1:marko","label": "person","type": "vertex","properties": {"name": [{"id": "1:marko>name","value": "marko"}],"age": [{"id": "1:marko>age","value": 30}]}}
2.1.6 获取符合条件的顶点
Params
- label: 顶点类型
- properties: 属性键值对(根据属性查询的前提是预先建立了索引)
- limit: 查询最大数目
- page: 页号
以上参数都是可选的，如果提供page参数，必须提供limit参数，不允许带其他参数。label, properties和limit可以任意组合。
属性键值对由JSON格式的属性名称和属性值组成，允许多个属性键值对作为查询条件，属性值支持精确匹配和范围匹配，精确匹配时形如properties={"age":29}，范围匹配时形如properties={"age":"P.gt(29)"},范围匹配支持的表达式如下：
| 表达式 | 说明 |
|---|---|
| P.eq(number) | 属性值等于number的顶点 |
| P.neq(number) | 属性值不等于number的顶点 |
| P.lt(number) | 属性值小于number的顶点 |
| P.lte(number) | 属性值小于等于number的顶点 |
| P.gt(number) | 属性值大于number的顶点 |
| P.gte(number) | 属性值大于等于number的顶点 |
| P.between(number1,number2) | 属性值大于等于number1且小于number2的顶点 |
| P.inside(number1,number2) | 属性值大于number1且小于number2的顶点 |
| P.outside(number1,number2) | 属性值小于number1且大于number2的顶点 |
| P.within(value1,value2,value3,…) | 属性值等于任何一个给定value的顶点 |
查询所有 age 为 20 且 label 为 person 的顶点
Method & Url
GET http://localhost:8080/graphs/hugegraph/graph/vertices?label=person&properties={"age":29}&limit=1
Response Status
200
Response Body
{"vertices": [{"id": "1:marko","label": "person","type": "vertex","properties": {"city": [{"id": "1:marko>city","value": "Beijing"}],"name": [{"id": "1:marko>name","value": "marko"}],"age": [{"id": "1:marko>age","value": 29}]}}]}
分页查询所有顶点，获取第一页（page不带参数值），限定3条
Method & Url
GET http://localhost:8080/graphs/hugegraph/graph/vertices?page&limit=3
Response Status
200
Response Body
{"vertices": [{"id": "2:ripple","label": "software","type": "vertex","properties": {"price": [{"id": "2:ripple>price","value": 199}],"name": [{"id": "2:ripple>name","value": "ripple"}],"lang": [{"id": "2:ripple>lang","value": "java"}]}},{"id": "1:vadas","label": "person","type": "vertex","properties": {"city": [{"id": "1:vadas>city","value": "Hongkong"}],"name": [{"id": "1:vadas>name","value": "vadas"}],"age": [{"id": "1:vadas>age","value": 27}]}},{"id": "1:peter","label": "person","type": "vertex","properties": {"city": [{"id": "1:peter>city","value": "Shanghai"}],"name": [{"id": "1:peter>name","value": "peter"}],"age": [{"id": "1:peter>age","value": 35}]}}],"page": "001000100853313a706574657200f07ffffffc00e797c6349be736fffc8699e8a502efe10004"}
返回的body里面是带有下一页的页号信息的，"page": "001000100853313a706574657200f07ffffffc00e797c6349be736fffc8699e8a502efe10004"，
在查询下一页的时候将该值赋给page参数。
分页查询所有顶点，获取下一页（page带上上一页返回的page值），限定3条
Method & Url
GET http://localhost:8080/graphs/hugegraph/graph/vertices?page=001000100853313a706574657200f07ffffffc00e797c6349be736fffc8699e8a502efe10004&limit=3
Response Status
200
Response Body
{"vertices": [{"id": "1:josh","label": "person","type": "vertex","properties": {"city": [{"id": "1:josh>city","value": "Beijing"}],"name": [{"id": "1:josh>name","value": "josh"}],"age": [{"id": "1:josh>age","value": 32}]}},{"id": "1:marko","label": "person","type": "vertex","properties": {"city": [{"id": "1:marko>city","value": "Beijing"}],"name": [{"id": "1:marko>name","value": "marko"}],"age": [{"id": "1:marko>age","value": 29}]}},{"id": "2:lop","label": "software","type": "vertex","properties": {"price": [{"id": "2:lop>price","value": 328}],"name": [{"id": "2:lop>name","value": "lop"}],"lang": [{"id": "2:lop>lang","value": "java"}]}}],"page": null}
此时"page": null表示已经没有下一页了 (注: 后端为 Cassandra 时，为了性能考虑，返回页恰好为最后一页时，返回 page 值可能非空，通过该 page 再请求下一页数据时则返回 空数据 及 page = null，其他情况类似)
2.1.7 根据Id获取顶点
Method & Url
GET http://localhost:8080/graphs/hugegraph/graph/vertices/"1:marko"
Response Status
200
Response Body
{"id": "1:marko","label": "person","type": "vertex","properties": {"name": [{"id": "1:marko>name","value": "marko"}],"age": [{"id": "1:marko>age","value": 29}]}}
2.1.8 根据Id删除顶点
Params
- label: 顶点类型，可选参数
仅根据Id删除顶点
Method & Url
DELETE http://localhost:8080/graphs/hugegraph/graph/vertices/"1:marko"
Response Status
204
根据Label+Id删除顶点
通过指定Label参数和Id来删除顶点时，一般来说其性能比仅根据Id删除会更好。
Method & Url
DELETE http://localhost:8080/graphs/hugegraph/graph/vertices/"1:marko"?label=person
Response Status
204
