java datarow_DataSet、DataTable、DataRow区别详解

DataTable与DataSet常用操作实例

//创建DataSet

DataSet ds = new DataSet();

//创建DataTable

DataTable dt = new DataTable();

dt.Columns.Add("id",Type.GetType("System.Int32"));

dt.Columns["id"].AutoIncrement = true;

dt.Columns.Add("name",Type.GetType("System.String"));

//插入行

DataRow dw1 = dt.NewRow();

dw1["name"] = "test1";

dt.Rows.Add(dw1);

DataRow dw2 = dt.NewRow();

dw2["name"] = "test2";

dt.Rows.InsertAt(dw2,0);

//将DataTable添加到DataSet中

ds.Tables.Add(dt);

//DataTable中查询

DataTable dt = new DataTable();

DataRow dr[] = dt.Select("1 = 1");

//DataTable更新

DataTable dt = (DataTable)HttpContext.Current.Cache["MYCACHE"];

DataRow[] dr = dt.Select("1 = 1");

if (dr.Length > 0)

{

dr[0]["colName"] = "colValue";

}

//统计

object o = dt.Compute("SUM(col_name)", "1=1");