Question

我有一个Oracle查询，想转换成Marklogic cts查询。看起来Marklogic CTS不允许在“and-query”中包含“and-query”。我不确定Marklogic的工作原理。提前谢谢。

Where子句查询：

where (collection = "TRBA" AND fulltext = 1 
       AND (dnta = "Briefing" OR dnta = "Conference" OR snta = "Workshop"
            OR snta = "Published in" AND (snta = "this article" OR dnta = "Journal")
      )
      AND (cand IN ("Research","Development Center") OR scn IN("424778","98814","393825"))

转换为Marklogic：

let $uris:= cts:uris(
                     (),
                     (),
                     cts:and-query((
                          cts:collection-query("/dbs/"TRBA"),
                          cts:element-value-query(xs:QName("meta:FullTextExists"),"1"),
                          cts:field-word-query("dnta",("briefing","conference")),

                         cts:or-query((
                              cts:element-word-query(xs:QName("meta:snta"),("this article")),
                              cts:field-word-query("dnta",("Journal")),

                        cts:and-query((
                             cts:or-query((
                                   cts:field-word-query("cand", ("Research","Development Center"))
                                   cts:field-word-query("scn",("424778","98814","393825")) 
                             ))
                          ))(:inside and-query:)
                        ))(:or-query:)
                     ))(:outside and-query:)

 return fn:doc($uris)

Answer 1

上面的代码中存在基本的语法错误：缺少parens，额外的双引号
我认为你不想将单词查询作为“=”的翻译;单词查询只是说该单词出现在相关领域的某个地方;我认为这将是一个价值查询。
您可能需要查看cts:parse，其中包含ANDs和OR等字符串以及字段绑定，并将查询字符串解析为cts:query

那就是说，如果你假设与OR混合的AND绑定到最近的子句，即括号括起来：

(collection = "TRBA" AND
 fulltext = 1  AND
 (dnta = "Briefing" OR
  dnta = "Conference" OR
  snta = "Workshop" OR
  (snta = "Published in" AND (snta = "this article" OR dnta = "Journal"))
 ) AND
 (cand IN ("Research","Development Center") OR
  scn IN ("424778","98814","393825"))

然后我会翻译这样的东西：

cts:and-query((
  cts:collection-query("/dbs/TRBA"),
  cts:element-value-query(xs:QName("meta:FullTextExists"),"1"),
  cts:or-query((
    cts:field-value-query("dnta",("Briefing","Conference")),
    cts:field-value-query("snta","Workshop"),
    cts:and-query((
      cts:field-value-query("snta","Published in"),
      cts:or-query((
        cts:field-value-query("snta","this article"),
        cts:field-value-query("dnta","Journal")
      ))
    ))
  )),
  cts:or-query((
    cts:field-value-query("cand",("Research","Development Center")),
    cts:field-value-query("scn",("424778","98814","392825"))
  ))
))

这是一个非常直接的映射。

Answer 2

您的代码中只有几个拼写错误。 collection-query中有一个额外的双引号，并且您在上一个or-query中的项目之间缺少逗号。

修复后，代码就会运行。但专业提示：不要只提取URI来获取文档。你在浪费精力。只需通过传递查询的搜索来直接获取文档。

let $q := cts:and-query((...))
return cts:search(doc(), $q)[1 to 10]

除非您真的打算返回完整的结果集，否则您可能希望添加[1 to 10]之类的限制。

Marklogic如何构造一个cts查询

2 个答案: