csharp: datatable get Column datatype or Column Name

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csharp: datatable get Column datatype or Column Name

/// <summary> ///列表名 /// </summary> /// <param name="table"></param> /// <returns></returns> public static string GetColumnNames(System.Data.DataTable table) { if (table != null) { List<string> lstColumn…

csharp: DataTable Rename ColumnName and remove Column

enum ChangeNume { /// <summary> /// 简体 /// </summary> gbk=1, /// <summary> /// 英文 /// </summary> en=2, /// <summary> /// 繁体 /// </summary> big=3, ko=4, jp=5, } /// <summary> /// /// </summary> /// <return…

csharp: DataTable结构相同的比较

)  ) * pageSize;  ; i++)  {  DataRow newdr = newdt.NewRow();  DataRow dr = dt.Rows[i];  foreach (DataColumn column in dt.Columns)  {  newdr[column.ColumnName] = dr[column.ColumnName];  }  newdt.Rows.Add(newdr);  }   return newdt;    //2  //if (curren…

HBase在单Column和多Column情况下批量Put的性能对比分析

作者: 大圆那些事 | 文章可以转载,请以超链接形式标明文章原始出处和作者信息网址: http://www.cnblogs.com/panfeng412/archive/2013/11/28/hbase-batch-put-performance-analysis-of-single-column-and-multiple-columns.html 针对HBase在单column family单column qualifier和单column family多column qualifier两种…

ROW_NUMBER() OVER(PARTITION BY COLUMN ORDER BY COLUMN)

背景老生常谈,为sql当时着迷了,啥都用sql解决.看这个语句,麻烦的. ROW_NUMBER() OVER(PARTITION BY COLUMN ORDER BY COLUMN) 简单的说row_number()从1开始,为每一条分组记录返回一个数字,这里的ROW_NUMBER() OVER (ORDER BY xlh DESC) 是先把xlh列降序,再为降序以后的没条xlh记录返回一个序号.…

ROW_NUMBER() OVER(PARTITION BY COLUMN ORDER BY COLUMN DESC)函数的使用

ROW_NUMBER() OVER(PARTITION BY COLUMN ORDER BY COLUMN DESC)函数的作用是指定COLUMN(列)进行分区,在分区内指定COLUMN(列)进行排序,其中PARTITION BY COLUMN 为分区函数.代码具体实现如下不进行分区的排序方式--对商品价格的升序排序 SELECT A.*, ROW_NUMBER() OVERORDER BY PRICE ASC) AS ROW_FLG FROM COMMODITY A 进分区的排序方式--对商…

Modify column Vs change column

引言 I know, we can not rename a column using modify column syntax,but can change column syntax. My question is: what is the main usage of modify syntax? For example, alter table tablename change col1 col1 int(10) not null instead of alter table tablen…