我刚刚开始学习面向对象编程的概念,并将一个用于连接数据库,选择数据库和关闭数据库连接的类组合在一起.到目前为止,除了关闭与数据库的连接外,一切似乎都没问题.
class Database {
private $host, $username, $password;
public function __construct($ihost, $iusername, $ipassword){
$this->host = $ihost;
$this->username = $iusername;
$this->password = $ipassword;
}
public function connectdb(){
mysql_connect($this->host, $this->username, $this->password)
OR die("There was a problem connecting to the database.");
echo 'successfully connected to database<br />';
}
public function select($database){
mysql_select_db($database)
OR die("There was a problem selecting the database.");
echo 'successfully selected database<br />';
}
public function disconnectdb(){
mysql_close($this->connectdb())
OR die("There was a problem disconnecting from the database.");
}
}
$database = …Run Code Online (Sandbox Code Playgroud) 我想知道是否值得首先学习javascript?AJAX无论如何都需要Javascript,还是只是标记语言中的相似之处?
由于某种原因,我链接到的外部.js文件无法正常工作.我这样链接到它:
<script src="jquery.js" type="text/javascript"></script>
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.7.2/jquery.min.js" type="text/javascript"></script>
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我已经使用简单的内联脚本测试了jquery,以便在单击时隐藏文本段,以便jquery库存在并正常工作.
jquery.js文件与调用它的index.php文件位于同一文件夹中.
我究竟做错了什么?
这是我在外部.js文件中的代码,目前只是为了测试它是否正常工作(它不是):
$("document").ready(function(){
$("p").click(function(){
$("p").css("color", "red");
});
});
Run Code Online (Sandbox Code Playgroud) 我试图打开一个文本文件并将其中的名称列表分解为一个数组但是当我var_dump在新数组中我得到这个:
array(1) { [0]=> string(61) "name name name name " }
列表的全部内容都放在数组中的一个单个键字段中.
这是我正在使用的代码:
$ingame_list = file_get_contents('../../../../home/folder/folder/list.txt');
$newarray = explode(" ", $ingame_list);
var_dump($newarray);
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如何让每个名称都在新数组中的自己的关键字段中?
我有一个StackPanel在里面,里面有几个标签StackPanel.由于某种原因,内部StackPanel和Labels根本没有显示,为什么会这样?
<Window x:Class="WeatherApplication.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="Weather Application" Height="550" Width="850" Loaded="Window_Loaded" IsEnabled="True" ResizeMode="CanMinimize" Icon="/WeatherApplication;component/Images/weatherIcon.png">
<Grid Height="522" Background="#FFE7E7E7">
<DockPanel>
<Menu DockPanel.Dock="Top" Height="35" FontWeight="Bold" FontFamily="Arial">
<MenuItem Header="_File" Height="30" VerticalAlignment="Center" Padding="7,8,8,3">
<MenuItem Header="_Settings"/>
<MenuItem Header="_Close"/>
</MenuItem>
<MenuItem Header="_Help" Padding="7,8,8,3">
<MenuItem Header="_Guide"/>
<MenuItem Header="_About"/>
</MenuItem>
<Menu.Background>
<ImageBrush ImageSource="/WeatherApplication;component/Images/menuBG.png" />
</Menu.Background>
</Menu>
<StackPanel Width="230" HorizontalAlignment="Left" Margin=" 5">
<Label Content="Search location" FontFamily="Arial" FontSize="14" Height="28" Name="searchLocationLabel" IsEnabled="False" />
<StackPanel Orientation="Horizontal">
<Label Width="100" FontFamily="Arial" FontSize="14" Margin="3">Town</Label>
<TextBox Margin="3" Width="120"></TextBox>
</StackPanel>
<StackPanel …Run Code Online (Sandbox Code Playgroud) 我创建了一个BroadcastReceiver应该侦听“ACTION_SCREEN_OFF”意图的程序。
public class ExampleReceiver extends BroadcastReceiver {
@Override
public void onReceive(Context context, Intent intent) {
// run a service..
}
}
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我已经在清单中注册了它:
<receiver android:name=".path.to.ExampleReceiver">
<intent-filter>
<action android:name="android.intent.action.ACTION_SCREEN_OFF"></action>
</intent-filter>
</receiver>
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但当屏幕关闭时,该onReceive()方法不会被调用。我还需要做什么才能获得此功能?
我将鼠标悬停在相应的图像上时,尝试更改文本链接属性(不同的颜色和文本修饰:下划线;).
这是html:
<!-- Wraps image, title, category -->
<div class="itemWrap">
<!-- Item Image -->
<a href="#" class="itemImageLink"><img class="itemImage" src="img/thumb.png" alt="thumb"></a>
<!-- Item Title -->
<div class="itemTitle">
<a href="#">The original soul of Michael Jackson</a>
</div>
<!-- Item Category -->
<div class="itemCat">
<a href="#">12" Picture Disc</a>
</div>
</div><!-- close itemWrap -->
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是否有可能将鼠标悬停在itemImage(包含在锚点中)上,可以更改.itemTitle中链接的属性?
值得注意的是,在网页上多次使用itemWrap.
谢谢
我是c#的新手,我正在尝试读取.csv文件并将每行文本放入一个单独的列表项中,以便稍后对其进行排序.
.csv文件的组织方式如下:
1;"final60";"英国";"2013-12-06 15:48:16";
2;"donnyr8";"荷兰";"2013-12-06 15:54:32"; 等等
这是我的第一次尝试不起作用.它在Visual Studio 2010中没有显示错误,但是当我运行控制台程序时,它显示以下异常而不是列表.
Exception of type 'System.OutOFMemoryException' was thrown.这很奇怪,因为.csv文件只包含一个小列表.
try
{
// load csv file
using (StreamReader file = new StreamReader("file.csv"))
{
string line = file.ReadLine();
List<string> fileList = new List<string>();
// Do something with the lines from the file until the end of
// the file is reached.
while (line != null)
{
fileList.Add(line);
}
foreach (string fileListLine in fileList)
{
Console.WriteLine(fileListLine);
}
}
}
catch (Exception e)
{
// Let …Run Code Online (Sandbox Code Playgroud) 鉴于以下表格数据:
+------+---------+----------+----------+-------------+------------+-----------------+---------------------+
| id | version | quantity | state | orderLineId | locationId | stockMoveTaskId | created |
+------+---------+----------+----------+-------------+------------+-----------------+---------------------+
| 3277 | 0 | 2 | created | 169108 | 5692 | NULL | 2017-09-07 14:55:41 |
| 3073 | 0 | 2 | unpacked | 169108 | 5692 | NULL | 2017-09-07 09:40:35 |
+------+---------+----------+----------+-------------+------------+-----------------+---------------------+
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使用MySQL - 如果表中还包含一个给定订单行ID的状态为'unpacked'的行,我怎么能删除包含'created'状态的所有行?
对于以下 Terraform 代码 - 我希望最终得到 2 个测试沙箱开发实例和 1 个测试沙箱测试实例。我希望能够从地图值中得出计数instance_count。
我尝试过使用,count但 Terraform 不允许for_each.
terraform {
required_providers {
aws = {
source = "hashicorp/aws"
version = "~> 3.27"
}
}
required_version = ">= 0.14.9"
}
variable "instance_name" {
description = "Value of the Name tag for the EC2 instance"
type = string
default = "ChangedName"
}
variable "aws_region" {
description = "AWS Region"
type = string
default = "eu-west-2"
}
variable "instance_size_small" {
description = "Instance …Run Code Online (Sandbox Code Playgroud)