有没有办法选择列A是否A存在，否则选择B列？
对于一张桌子
A | B
-----|-----
foo | bar
NULL | bar
foo | NULL
结果将是
C
----
foo
bar
foo
文档中似乎没有支持此功能的功能。
Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
Literal1.Text = Request.QueryString("Pno")
On Error Resume Next
Dim SQLData As New System.Data.SqlClient.SqlConnection("workstation id=ws.example.com;packet size=4096;user id=some-user;pwd=some-password;data source=mssql.example.com;persist security info=False;initial catalog=some-db")
Dim cmdSelect As New System.Data.SqlClient.SqlCommand("SELECT * FROM a1_ticket WHERE PNR_no ='" & Literal1.Text & "'", SQLData)
SQLData.Open()
Dim dtrReader As System.Data.SqlClient.SqlDataReader = cmdSelect.ExecuteReader()
If dtrReader.HasRows Then
While dtrReader.Read()
Literal2.Text = dtrReader("bus_type")
Literal3.Text = dtrReader("dep_time")
Literal4.Text = dtrReader("PRN")
Literal5.Text = dtrReader("fro_m")
Literal6.Text = dtrReader("seat_opt")
Literal7.Text = dtrReader("Ticket_no")
Literal8.Text = dtrReader("t_o") …如何在C#中将任何日期格式转换为指定的格式.
例如:
如果日期格式是
14.11.2011 or 14/11/2011
寻找转换成的转换函数
yyyy-MM-dd format like 2011-11-14
我一直在研究一个非常大的html表单,它有一个重置按钮.在重置时,会发生数据库操作.
我有一个javascript函数,在重置时调用:
function clearDatabaseOfAnySavedForm() {
window.name = 1;
$.post('assets/scripts/reset-form.php');
window.location.reload();
$(document).load().scrollTop(0);
return false;
}
此函数中引用的php文件的代码是:
<?php
//Authcate
$authcate = xxxxx;
$username = "xxxxx";
$password = "xxxxx";
//$hostname = "xxxxx";
$hostname = "xxxxx";
$database = "xxxxx";
$conn = mysql_connect($hostname, $username, $password);
mysql_select_db($database, $conn) or die( "Unable to select database");
if (!empty($authcate)) {
$table = "xxxxx";
$sqlSelectQuery = "SELECT * FROM $table WHERE authcate = '$authcate'";
$selectResults = mysql_query($sqlSelectQuery);
$selectNumResults = mysql_num_rows($selectResults);
if ($selectNumResults > 0) {
$sqlUpdateQuery = "DELETE FROM $table …好吧,我的linq技能不是很好,所以我试着做以下事情.
说我有6000条记录(电子邮件地址)我想添加前1000个添加到密件抄送,发送,下一个1000添加到密送,发送,取1000添加到密送,发送等....
我开始打字,
string[] files = System.IO.Directory.GetFiles(@"C:\Mail\ ", "*.csv");
Parallel.ForEach(files, currentFile =>
{
string filename = currentFile;
StreamReader reader = new StreamReader(filename);
var emailList = new List<String>();
while (reader.Peek() >= 0)
{
emailList.Add(reader.ReadLine());
}
\\Here is where I need to do the linq?
IEnumerable<string> list = emailList
var message = new System.Net.Mail.MailMessage();
foreach (var s in list)
{
MailAddress mailAddress = new MailAddress(s);
message.Bcc.Add(mailAddress);
}
message.Subject = txtSubject.Text;
message.From = new System.Net.Mail.MailAddress(txtFrom.Text);
message.Body = txtMessage.Text;
message.IsBodyHtml = true;
var smtp …关于C#的快速问题.我已经在下面显示了我的代码,我不知道为什么循环永远不会关闭,Do While当用户输入"A"或"B"等时循环应该关闭,听起来像是一个愚蠢的问题我刚刚开始C#
do
{
Console.WriteLine("What one would you like to buy? A B C or D");
a = Convert.ToChar(Console.ReadLine());
Console.WriteLine(a);
} while (a != 'A' || a != 'B' || a != 'C' || a != 'D');
你能在这个例子中帮忙吗？我是初学者.我试图在控制台窗口中显示键盘的名称.
class Program
{
public static void Main(string[] args)
{
Console.Write("Your Name?: ");
string name = Console.Read();
Console.WriteLine("Welcome {0}", name);
}
}
我试图运行一个由5个班级组成的游戏,但最重要的部分是没有运行.请记住,我仍然是c#的初学者.所有5个类都是独立的,但我只在这里的第一个类中键入了名称空间,以避免混淆,它们在每个类中都有.该程序运行但当它到达Battle类时它完全跳过BattleLoop并询问我是否想再次玩...请帮帮我.
头等舱(我的入口点):
class Program
{
static void Main(string[] args)
{
MainGame maingame = new MainGame();
}
}
第二类:
class MainGame
{
Hero myhero;
Battle battle;
string answer;
public MainGame()
{
myhero = new Hero();
Hero.Initialize(myhero);
BasicGameLoop();
}
void BasicGameLoop()
{
do
{
Monster monster = new Monster();
battle = new Battle(myhero, monster);
Console.WriteLine("Do you want to Play again??");
answer= Console.ReadLine();
}
while(answer == "Y" || answer == "y");
}
}
第三类:
class Battle
{
string choice;
Random rand;
int healing, …