/// <summary>
/// 问答分页搜索
/// </summary>
/// <param name="askQuery">搜索条件</param>
/// <returns>符合条件的分页集合</returns>
public PagingDataSet <AskQuestion> Search(AskFullTextQuery askQuery)
{
if (string.IsNullOrWhiteSpace(askQuery.Keyword) && askQuery.IsRelation == false && askQuery.IsAlike == false)
{
return(new PagingDataSet <AskQuestion>(new List <AskQuestion>()));
}
LuceneSearchBuilder searchBuilder = BuilderLuceneSearchBuilder(askQuery);
Query query = null;
Filter filter = null;
Sort sort = null;
searchBuilder.BuildQuery(out query, out filter, out sort);
//调用SearchService.Search(),执行搜索
PagingDataSet <Document> searchResult = searchEngine.Search(query, filter, sort, askQuery.PageIndex, askQuery.PageSize);
IEnumerable <Document> docs = searchResult.ToList <Document>();
//问题ids
List <long> questionIds = new List <long>();
foreach (Document doc in docs)
{
long questionId = long.Parse(doc.Get(AskIndexDocument.QuestionId));
questionIds.Add(questionId);
}
//根据ids批量获取问题实体
IEnumerable <AskQuestion> questionList = askService.GetQuestions(questionIds);
//组装分页对象
PagingDataSet <AskQuestion> questions = new PagingDataSet <AskQuestion>(questionList)
{
TotalRecords = searchResult.TotalRecords,
PageIndex = searchResult.PageIndex,
PageSize = searchResult.PageSize,
QueryDuration = searchResult.QueryDuration
};
return(questions);
}
/// <summary>
/// 构建lucene查询条件
/// </summary>
/// <param name="query"></param>
/// <returns></returns>
private LuceneSearchBuilder BuilderLuceneSearchBuilder(AskFullTextQuery query)
{
LuceneSearchBuilder searchBuilder = new LuceneSearchBuilder();
Dictionary <string, BoostLevel> fieldNameAndBoosts = new Dictionary <string, BoostLevel>();
if (query.IsAlike)
{
searchBuilder.WithPhrases(AskIndexDocument.Subject, query.Keywords, BoostLevel.Hight, false);
}
else if (query.IsRelation)
{
fieldNameAndBoosts.Add(AskIndexDocument.Subject, BoostLevel.Hight);
fieldNameAndBoosts.Add(AskIndexDocument.Tag, BoostLevel.Hight);
searchBuilder.WithPhrases(fieldNameAndBoosts, query.Keywords, BooleanClause.Occur.SHOULD, false);
}
else
{
//筛选
switch (query.Range)
{
case AskSearchRange.SUBJECT:
fieldNameAndBoosts.Add(AskIndexDocument.Subject, BoostLevel.Hight);
fieldNameAndBoosts.Add(AskIndexDocument.Body, BoostLevel.Medium);
searchBuilder.WithPhrases(fieldNameAndBoosts, query.Keyword, BooleanClause.Occur.SHOULD, false);
break;
case AskSearchRange.TAG:
searchBuilder.WithPhrase(AskIndexDocument.Tag, query.Keyword, BoostLevel.Hight, false);
break;
case AskSearchRange.AUTHOR:
searchBuilder.WithPhrase(AskIndexDocument.Author, query.Keyword, BoostLevel.Hight, false);
break;
case AskSearchRange.ANSWER:
searchBuilder.WithPhrase(AskIndexDocument.Answer, query.Keyword, BoostLevel.Hight, false);
break;
default:
fieldNameAndBoosts.Add(AskIndexDocument.Subject, BoostLevel.Hight);
fieldNameAndBoosts.Add(AskIndexDocument.Tag, BoostLevel.Hight);
fieldNameAndBoosts.Add(AskIndexDocument.Body, BoostLevel.Medium);
fieldNameAndBoosts.Add(AskIndexDocument.Answer, BoostLevel.Medium);
fieldNameAndBoosts.Add(AskIndexDocument.Author, BoostLevel.Low);
searchBuilder.WithPhrases(fieldNameAndBoosts, query.Keyword, BooleanClause.Occur.SHOULD, false);
break;
}
}
//过滤可以显示的问题
switch (publiclyAuditStatus)
{
case PubliclyAuditStatus.Again:
case PubliclyAuditStatus.Fail:
case PubliclyAuditStatus.Pending:
case PubliclyAuditStatus.Success:
searchBuilder.WithField(AskIndexDocument.AuditStatus, ((int)publiclyAuditStatus).ToString(), true, BoostLevel.Hight, true);
break;
case PubliclyAuditStatus.Again_GreaterThanOrEqual:
case PubliclyAuditStatus.Pending_GreaterThanOrEqual:
searchBuilder.WithinRange(AskIndexDocument.AuditStatus, ((int)publiclyAuditStatus).ToString(), ((int)PubliclyAuditStatus.Success).ToString(), true);
break;
}
if (query.sortBy == SortBy_AskQuestion.DateCreated_Desc)
{
searchBuilder.SortByString(AskIndexDocument.DateCreated, true);
}
return(searchBuilder);
}