01 2013 档案
摘要：一. 二进制转换成图片MemoryStream ms = new MemoryStream(bytes);ms.Position = 0;Image img = Image.FromStream(ms);ms.Close();this.pictureBox1.Image二. C#中byte[]与string的转换代码1、System.Text.UnicodeEncoding converter = new System.Text.UnicodeEncoding(); byte[] inputBytes =converter.GetBytes(inputString); string inp..
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摘要：1. 新建工程a) 引用Lucene.Net.dllusing Lucene.Net.Index;using Lucene.Net.Documents;using Lucene.Net.Analysis;using Lucene.Net.Analysis.Standard;using Lucene.Net.Search;using Lucene.Net.QueryParsers;2. 创建索引(Creating an index)在你开始进行搜索之前,你需要创建一个的索引,并且添加你想搜索的数据a) .创建索引使用一个名叫 IndexWriter的类IndexWriter writer = n
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摘要：直接看例子例子： table id name 1 a 2 b 3 c 4 c 5 b1 通过 distinct 来实现select distinct name from table结果：nameabc2 通过 group_concat 配合 group by 来实现 (注意：需要mysql 4.1及以上)select id,group_concat(distinct name) from table group by name结果：id name1 a2 b3 c3 通过select id, count(distinct name) from table group by name结果：id.
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