RavenDB使用StartsWith搜索多个术语

Question

当在编译时不知道这些术语时,是否建议使用StartsWith搜索多个术语中的每个术语？

我想象这样的事情:

var searchTerms = "John Doe".Split(new[] { ' ' }, StringSplitOptions.RemoveEmptyEntries);
var query = session.Query<Person, PersonIndex>()
                   .Where(x => x.FirstName.StartsWithAnyOf(searchTerms) ||
                               x.LastName.StartsWithAnyOf(searchTerms));

查询将相当于:

var query = session.Query<Person, PersonIndex>()
                   .Where(x => x.FirstName.Starts(searchTerms[0]) ||
                               x.LastName.StartsWith(searchTerms[0]) ||
                               x.FirstName.Starts(searchTerms[1]) ||
                               x.LastName.StartsWith(searchTerms[1]));

是在运行时(PredicateBuilder或类似)构建LINQ查询的答案吗？

Answer 1

使用 LuceneQuery（可能需要使用子条款，具体取决于您正在执行的其他操作）：

var searchTerms = "John Doe".Split(new[] { ' ' }, StringSplitOptions.RemoveEmptyEntries);

var query = session.Advanced.LuceneQuery<Person, PersonIndex>();
query = query.OpenSubclause(); // optional

foreach (var term in terms)
{
    query = query.WhereStartsWith("FirstName"), term).OrElse();
    query = query.WhereStartsWith("LastName"), term).OrElse();
}

query = query.WhereEquals("Id", null);
query = query.CloseSubclause(); // if OpenSubclause() was used

如果您想要强类型变量名称，请查看此答案：/sf/answers/21137021/