我正在尝试实现我自己的自定义 SearchService。据我了解
// If I wanted to query "+name:camera +price:[100 TO 150] +location:thailand"
searchBuilder.WithField("name", "camera").ExactMatch().Mandatory();
searchBuilder.WithinRange("price", 100, 150, true, true).Mandatory();
searchBuilder.WithField("location", "thailand").ExactMatch().Mandatory();
这里没问题。但是如何处理带有分组的查询(带括号的子句)?
// How do I query "+name:camera +(price:[100 TO 150] cost:[100 TO 150]) +(bundle-price:[100 TO 150] total-price:[100 TO 150])"?
// Since the ISearchBuilder interface doesn't support grouping, the only other way
// I could think of is to use the freestyle ISearchBuilder.Parse() to construct the query.
// However this doesn't return any hits:
searchBuilder.WithField("name", "camera").ExactMatch().Mandatory();
searchBuilder.Parse("price", "[100 TO 150] cost:[100 TO 150]", false).Mandatory();
searchBuilder.Parse("bundle-price", "[100 TO 150] total-price:[100 TO 150]", false).Mandatory();
只是没有足够的信息ISearchBuilder.Parse()
来确定范围的数据类型(无论是int
还是float
)double
。看起来卢克也有这个问题,可以使用我认为 Lucene.Net 没有的 XML Query Parser 来规避:
我在想,如果ISearchBuilder
有一种方法可以让我们插入自己的查询
// /src/Orchard/Indexing/ISearchBuider.cs
public interface ISearchBuilder {
ISearchBuilder WithQuery(Query query);
}
// /src/Orchard.Web/Modules/Lucene/Services/LuceneSearchBuilder.cs
public class LuceneSearchBuilder : ISearchBuilder {
public ISearchBuilder WithQuery(Query query) {
CreatePendingClause();
_query = query;
return this;
}
}
public class CustomSearchService {
public void Search() {
// construct our own custom queries
var booleanQuery1 = new BooleanQuery();
booleanQuery1.Add(NumericRangeQuery.NewDoubleRange("price", 100, 150, true, true), Occur.SHOULD);
booleanQuery1.Add(NumericRangeQuery.NewDoubleRange("cost", 100, 150, true, true), Occur.SHOULD);
var booleanQuery2 = new BooleanQuery();
booleanQuery2.Add(NumericRangeQuery.NewDoubleRange("bundle-price", 100, 150, true, true), Occur.SHOULD);
booleanQuery2.Add(NumericRangeQuery.NewDoubleRange("total-price", 100, 150, true, true), Occur.SHOULD);
searchBuilder.WithField("name", "camera").ExactMatch().Mandatory();
// insert our custom queries into the SearchBuilder using the newly added interface method (ISearchBuilder.WithQuery()) above
searchBuilder.WithQuery(booleanQuery1).Mandatory();
searchBuilder.WithQuery(booleanQuery2).Mandatory();
}
}
然后我们可以构造更复杂、更灵活的查询。
更新
之前有人在 https://github.com/OrchardCMS/Orchard/issues/5764提出过这个问题