ArangoDB的AQL(ArangoDB Query Language)是一种用于查询和操作图数据库的语言。它允许你编写复杂的查询来处理图形数据结构。以下是一些处理复杂查询的AQL语法示例:
FOR
子句进行循环遍历:FOR vertex IN GraphName
FILTER vertex.property == "value"
RETURN vertex
COLLECT
子句收集结果:FOR vertex IN GraphName
COLLECT property = vertex.property
RETURN {vertex, properties: COLLECT(property)}
unwind
子句展开数组:FOR document IN CollectionName
UNWIND document.arrayProperty AS element
RETURN {document, element}
JOIN
子句连接两个集合:FOR vertex1 IN GraphName
JOIN vertex2 IN GraphName ON vertex1.property == vertex2.property
RETURN {vertex1, vertex2}
GROUP BY
子句对结果进行分组:FOR document IN CollectionName
GROUP BY document.property
RETURN {key: document.property, count: COUNT(document)}
ORDER BY
子句对结果进行排序:FOR document IN CollectionName
ORDER BY document.property DESC
RETURN document
LIMIT
子句限制查询结果的数量:FOR document IN CollectionName
LIMIT 10
RETURN document
SKIP
子句跳过查询结果的一部分:FOR document IN CollectionName
SKIP 5
RETURN document
INSERT
子句插入新文档:FOR vertex IN GraphName
INSERT {property: "value"} INTO GraphName
RETURN inserted
UPDATE
子句更新现有文档:FOR vertex IN GraphName
UPDATE vertex WITH {property: "newValue"} IN GraphName
RETURN updated
DELETE
子句删除文档:FOR vertex IN GraphName
DELETE vertex IN GraphName
RETURN deleted
通过组合这些子句,你可以构建复杂的查询来处理图形数据结构。在实际应用中,你可能需要根据具体需求调整这些示例代码。