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要求：尽快按照加入日期（ /Employee/JoiningDate ）的升序获取与查询匹配的员工 ID（/Employee/@id ）

环境：MarkLogic DB 有100 万个员工 XML

QUERY-1 [运行速度很慢，但以正确的顺序返回数据]

let $fullQuery :=
    cts:and-query((
        cts:directory-query("/employee/", "infinity"),
        cts:element-value-query(fn:QName("","DeptName"), "Sales", ("case-insensitive")),
        cts:element-value-query(fn:QName("","SubDeptName"), "Micro", ("case-insensitive"))
    ))
let $queryOptions := ("unfiltered", cts:index-order(cts:element-reference(fn:QName("","JoiningDate"),("type=dateTime")), "ascending"))
return cts:search(/Employee, $fullQuery, $queryOptions)!fn:string(./@id) (: Using ! to get id's in sorted order. This seems to affect performance quite heavily. :)

QUERY-2 [运行速度非常快，但返回的数据顺序不正确]

let $fullQuery :=
    cts:and-query((
        cts:directory-query("/employee/", "infinity"),
        cts:element-value-query(fn:QName("","DeptName"), "Sales", ("case-insensitive")),
        cts:element-value-query(fn:QName("","SubDeptName"), "Micro", ("case-insensitive"))
    ))
let $queryOptions := ("concurrent")
return cts:element-attribute-values(xs:QName("Employee"), xs:QName("id"), (), $queryOptions, $fullQuery)

如何使用上述两种方法中的任何一种来满足要求？

4

1 回答 1

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cts:value-co-occurrences将让您按一个索引排序，同时从另一个索引返回值。

例如

for $v in cts:value-co-occurrences(
  cts:element-reference(xs:QName("JoiningDate"),
  cts:element-attribute-reference(xs:QName("Employee"), xs:QName("id")),
  (), 
  $fullQuery
)
return $v/cts:value[2]/string(.)
于 2021-05-21T22:26:15.113 回答