ArangoDB的AQL(ArangoDB Query Language)是一種用于查詢和操作圖數據庫的語言。它允許你編寫復雜的查詢來處理圖形數據結構。以下是一些處理復雜查詢的AQL語法示例:
FOR
子句進行循環遍歷:FOR vertex IN GraphName
FILTER vertex.property == "value"
RETURN vertex
COLLECT
子句收集結果:FOR vertex IN GraphName
COLLECT property = vertex.property
RETURN {vertex, properties: COLLECT(property)}
unwind
子句展開數組:FOR document IN CollectionName
UNWIND document.arrayProperty AS element
RETURN {document, element}
JOIN
子句連接兩個集合:FOR vertex1 IN GraphName
JOIN vertex2 IN GraphName ON vertex1.property == vertex2.property
RETURN {vertex1, vertex2}
GROUP BY
子句對結果進行分組:FOR document IN CollectionName
GROUP BY document.property
RETURN {key: document.property, count: COUNT(document)}
ORDER BY
子句對結果進行排序:FOR document IN CollectionName
ORDER BY document.property DESC
RETURN document
LIMIT
子句限制查詢結果的數量:FOR document IN CollectionName
LIMIT 10
RETURN document
SKIP
子句跳過查詢結果的一部分:FOR document IN CollectionName
SKIP 5
RETURN document
INSERT
子句插入新文檔:FOR vertex IN GraphName
INSERT {property: "value"} INTO GraphName
RETURN inserted
UPDATE
子句更新現有文檔:FOR vertex IN GraphName
UPDATE vertex WITH {property: "newValue"} IN GraphName
RETURN updated
DELETE
子句刪除文檔:FOR vertex IN GraphName
DELETE vertex IN GraphName
RETURN deleted
通過組合這些子句,你可以構建復雜的查詢來處理圖形數據結構。在實際應用中,你可能需要根據具體需求調整這些示例代碼。