Question

我想在MarkLogic数据库中搜索包含给定元素值对的XML文档，我想改变元素值对的大小。

这是我写的查询，以查找具有ACCOUNT＆＃34; 00100＆＃34;和描述为＆＃34;你好＆＃34;。

    QueryManager queryMgr = client.newQueryManager();
    StructuredQueryBuilder qryBldr = new StructuredQueryBuilder();
    StructuredQueryDefinition query1 = 
    qryBldr.value(qryBldr.element("ACCOUNT"), "00100");
    StructuredQueryDefinition query2 = 
    qryBldr.value(qryBldr.element("DESCRIPTION"), "hello");
    StructuredQueryDefinition query = qryBldr.and(query1,query2);
    SearchHandle resultsHandle = new SearchHandle();
    queryMgr.search(query, resultsHandle);

我想编写一个方法，它将获取包含键值对的输入映射，它将根据映射键值对形成查询并返回匹配的文档。

示例文档如下所示：

  <Tax>
      <ACCOUNT>00100</ACCOUNT>
      <DESCRIPTION>hello</DESCRIPTION>
      <AMOUNT>100</AMOUNT>
      <DATE>05252018</DATE>
  </Tax>

我该如何实现？

Answer 1

Java 8应该能够使用类似于以下代码的流转换地图（未经测试）：

StructuredQueryDefinition query = qryBldr.and(
    theInputMap
    .entrySet()
    .stream()
    .map(entry -> qryBlder.value(
        qryBldr.element(entry.getKey()), entry.getValue()
        ))
    .toArray(size -> new StructuredQueryDefinition[size])
    );

如果查询始终由键值对组成，您还可以考虑按示例查询：

http://docs.marklogic.com/guide/search-dev/qbe

在这种方法中，您只需将地图序列化为JSON - 例如，使用Jackson。

希望有帮助，

Answer 2

We can use the Query By Example(QBE) method to solve this issue.
Ex: document structure 

       <Account>
         <Name>ram</Name>
         <AccountNumber>999</AccountNumber>
         <Amount>100<Amount>
       </Account>

We can use qbe write as below 

String XMLQuery =
  "<q:qbe xmlns:q='http://marklogic.com/appservices/querybyexample'>"+
  "<q:query>" +
  "<Name>ram</Name>" +
  "</q:query>" +
  "</q:qbe>";
StringHandle newHandle=new StringHandle(XMLQuery).withFormat(Format.XML);
RawQueryByExampleDefinition querydef =
    queryMgr.newRawQueryByExampleDefinition(newHandle);
SearchHandle resultsHandle = 
    queryMgr.search(querydef, new SearchHandle());

For forming the XMLQuery from Map we can use below code:

    public String getMarklogicQuery(Map<String,String> map){
        StringBuffer query = new StringBuffer();
        query.append("<q:qbe xmlns:q='http://marklogic.com/appservices/querybyexample'>");
        query.append("<q:query>");
        for(String key:map.keySet()){
            query.append("<"+key+">"+map.get(key)+"</"+key+">");
        }
        query.append("</q:query>");
        query.append("</q:qbe>");

    return query.toString();
    }

参考：https://docs.marklogic.com/guide/java/searches#id_33275

使用java在MarkLogic数据库中使用多个键值对进行搜索

2 个答案: