ArangoDB的AQL(ArangoDB Query Language)是一種用于查詢(xún)和操作圖數(shù)據(jù)庫(kù)的語(yǔ)言。它允許你編寫(xiě)復(fù)雜的查詢(xún)來(lái)處理圖形數(shù)據(jù)結(jié)構(gòu)。以下是一些處理復(fù)雜查詢(xún)的AQL語(yǔ)法示例:
FOR
子句進(jìn)行循環(huán)遍歷:FOR vertex IN GraphName
FILTER vertex.property == "value"
RETURN vertex
COLLECT
子句收集結(jié)果:FOR vertex IN GraphName
COLLECT property = vertex.property
RETURN {vertex, properties: COLLECT(property)}
unwind
子句展開(kāi)數(shù)組:FOR document IN CollectionName
UNWIND document.arrayProperty AS element
RETURN {document, element}
JOIN
子句連接兩個(gè)集合:FOR vertex1 IN GraphName
JOIN vertex2 IN GraphName ON vertex1.property == vertex2.property
RETURN {vertex1, vertex2}
GROUP BY
子句對(duì)結(jié)果進(jìn)行分組:FOR document IN CollectionName
GROUP BY document.property
RETURN {key: document.property, count: COUNT(document)}
ORDER BY
子句對(duì)結(jié)果進(jìn)行排序:FOR document IN CollectionName
ORDER BY document.property DESC
RETURN document
LIMIT
子句限制查詢(xún)結(jié)果的數(shù)量:FOR document IN CollectionName
LIMIT 10
RETURN document
SKIP
子句跳過(guò)查詢(xún)結(jié)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(xiàn)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(guò)組合這些子句,你可以構(gòu)建復(fù)雜的查詢(xún)來(lái)處理圖形數(shù)據(jù)結(jié)構(gòu)。在實(shí)際應(yīng)用中,你可能需要根據(jù)具體需求調(diào)整這些示例代碼。