Lucence.Net 2.9.3 日期范围搜索

时间：2011-05-10 来源：nasdaqhe

关键步骤如下：

1.将 DateTime 转换成 long 型。 2.索引时要使用 NumericField 进行索引 3.搜索时使用 NumericRangeQuery 进行查询

事例代码如下：

[TestMethod()]

        public void RangTest()
        {
            RAMDirectory mDirInfo = new RAMDirectory();
            IndexWriter mIndexWriter = new IndexWriter(mDirInfo, CAnalyzerLoader.GetAnalyzer(), true, IndexWriter.MaxFieldLength.LIMITED);
            mIndexWriter.AddDocument(GetDocumentByModel(1, "姑姑，我是态儿", CDateTime.UNIX_TIMESTAMP(System.DateTime.Now.AddDays(-1))));
            mIndexWriter.AddDocument(GetDocumentByModel(2, "B儿，我是态儿", CDateTime.UNIX_TIMESTAMP(System.DateTime.Now.AddDays(-2))));
            mIndexWriter.AddDocument(GetDocumentByModel(3, "肝儿，我是态儿", CDateTime.UNIX_TIMESTAMP(System.DateTime.Now.AddDays(-3))));
            mIndexWriter.Close();
            long upper = CDateTime.UNIX_TIMESTAMP(DateTime.Now.AddDays(-1));
            long lower = CDateTime.UNIX_TIMESTAMP(DateTime.Now.AddDays(-3).AddHours(-1));
            NumericRangeQuery rangeQuery = NumericRangeQuery.NewLongRange("UpdateOn", lower, upper, true, true);

            IndexSearcher mSearcher = new IndexSearcher(mDirInfo, true);
            TopDocs topDocs = mSearcher.Search(rangeQuery, 100);
            Assert.AreEqual(2, topDocs.totalHits);
        }

        private Document GetDocumentByModel(int tid,string title,long time)
        {
            Document doc = new Document();
            doc.AddFiled("Id", tid.ToString(), Field.Store.YES, Field.Index.NOT_ANALYZED)
                .AddFiled("Title", title.Trim(), Field.Store.YES, Field.Index.ANALYZED)
                .AddLongFiled("UpdateOn", time, Field.Store.NO, true);
            return doc;
        }
   public static Document AddFiled(this Document self, string name, string value, Field.Store fStore, Field.Index fIndex)
        {
            Field filed = new Field(name, value, fStore, fIndex);
            self.Add(filed);
            return self;
        }
        public static Document AddLongFiled(this Document self, string name, long value, Field.Store fStore, bool bIndex)
        {
            NumericField filed = new NumericField(name, NumericUtils.PRECISION_STEP_DEFAULT, fStore, bIndex).SetLongValue(value);
            self.Add(filed);
            return self;
        }