SqlDataAdapter有关InsertCommand,UpdateCommand,DeleteCommand 实例

//InsertCommand
            using (SqlConnection conn = new SqlConnection(connectionstring))
            {
                conn.Open();
                DataTable dtInsert = new DataTable();
                dtInsert.Columns.Add("DeptID", typeof(int));
                dtInsert.Columns.Add("DeptName", typeof(string));
                dtInsert.Rows.Add(new object[] { "1", "技术部" });
                dtInsert.Rows.Add(new object[] { "2", "招商部" });
                dtInsert.Rows.Add(new object[] { "3", "信息部" });

                SqlDataAdapter adapter = new SqlDataAdapter();
                adapter.InsertCommand = new SqlCommand("insert into Dept(DeptID,DeptName) values(@DeptID,@DeptName)", conn);
                adapter.SelectCommand = new SqlCommand("select * from Dept where 1=0", conn);//仅为了获得框架
                adapter.InsertCommand.Parameters.Add("DeptID", SqlDbType.Int);
                adapter.InsertCommand.Parameters.Add("DeptName", SqlDbType.VarChar);

                adapter.InsertCommand.Parameters["DeptID"].SourceColumn = "DeptID";
                adapter.InsertCommand.Parameters["DeptName"].SourceColumn = "DeptName";
                //adapter.InsertCommand.Parameters["AddDate"].Value = DateTime.Now;//直接赋值

                adapter.InsertCommand.UpdatedRowSource = UpdateRowSource.None;
                adapter.Fill(dtInsert);
                if (dtInsert.Rows.Count > 0)
                {
                    adapter.Update(dtInsert);
                }
            }

2,UpdateCommand

 //UpdateCommand
            using (SqlConnection conn = new SqlConnection(connectionstring))
            {
                conn.Open();
                DataSet ds = new DataSet();
                string sql = "select * from Dept";
                SqlDataAdapter adapate = new SqlDataAdapter(sql, conn);
                adapate.Fill(ds, "table1");

                foreach (DataRow datarow in ds.Tables[0].Rows)
                {
                    datarow["DeptName"] = "sc";//ai->sc
                }
                SqlCommandBuilder builder = new SqlCommandBuilder(adapate);
                adapate.Update(ds, "table1");
            }

3,DeleteCommand

//DeleteCommand
            using (SqlConnection conn = new SqlConnection(connectionstring))
            {
                conn.Open();
                DataSet ds = new DataSet();
                string sql = "select * from Dept";
                //string sql = "select * from Dept where deptid=1";
                SqlDataAdapter adapter = new SqlDataAdapter(sql, conn);
                adapter.Fill(ds, "table1");

                adapter.DeleteCommand = new SqlCommand("delete from Dept", conn);
                //adapter.DeleteCommand = new SqlCommand("delete from Dept where deptid=@deptid", conn);
                //adapter.DeleteCommand.Parameters.Add("deptid", SqlDbType.Int);
                //adapter.DeleteCommand.Parameters["deptid"].SourceColumn = "deptid";
                
                ds.Tables["table1"].Rows[ds.Tables["table1"].Rows.Count - 1].Delete();
                adapter.Update(ds, "table1");
            }