如何在 dotnetrdf QueryBuilder 中保持绑定顺序？

问题描述

我使用 Dotnetrdf QueryBuilder 使用 Bind 语句构建查询。在构建查询并获取输出字符串后，我发现 Bind 语句总是在三元组之后。但是，我需要 Bind 语句保持其顺序位置。有没有办法做到这一点？

以下是 Stardog 示例查询。我尝试使用 QueryBuilder 来重建查询。这个问题来自翻译这一行： BIND (?latestReportDate - "P7D"^^xsd:dayTimeDuration AS ?prevReportDate)。这是我的代码。一切正常。问题来自最终查询输出字符串，绑定语句在输出查询字符串的底部；但是，在这种情况下，此绑定语句应保持其顺序

        queryBuilder
                .Bind(b => ((b.Variable("latestReportDate"))
                - (new NumericExpression(new ConstantTerm(new TimeSpanNode(null,new TimeSpan(7,0)))))
                )).As("prevReportDate")

queryBuilder.BuildQuery().ToString()

# Average daily percentage increase in each state for the last 7 days

SELECT ?state (roundHalfToEven(100 * sum(?countyIncrease) / (sum(?prevCases) * 7),2) AS ?avgDailyIncrease) 
{
    # use precalculated last date to compute the date for 7 days ago
    [ :latestReportDate ?latestReportDate ] .
    BIND (?latestReportDate - "P7D"^^xsd:dayTimeDuration AS ?prevReportDate)

    # get the lastest number of cases for the county
    ?latestReport :county ?county ;
                  :cases ?latestCases ;
                  :date ?latestReportDate .

    # get the number of cases for the county 7 days ago
    ?prevReport :county ?county ;
                :cases ?prevCases ;
                :date ?prevReportDate .

    # compute the increase in number of cases for the county
    BIND (?latestCases - ?prevCases AS ?countyIncrease) 
    
    # get the state for the county
    ?county :state/rdfs:label ?state .   
}
GROUP BY ?state
ORDER BY desc(?avgDailyIncrease)

解决方法

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