我有以下查询:
SELECT NAME, SURNAME FROM MY_TABLE WHERE NAME = ?;
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现在我想要那个'?' 为NULL,必须选择所有记录.我怎样才能在SQL中实现这一点?谢谢
嗨我必须从JList中选择一个元素到另一个,从第一个中删除它我创建的方法只插入一个元素,覆盖最后一个元素并且不从第一个JList中删除所选项目这里是代码:
第一个清单
private javax.swing.JList listaRosa;
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填充此方法:
private void visualizzaRosaButtonvisualizzaRosa(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
visualizzaSquadraSelezionata();
String fileSquadra;
fileSquadra = squadraDaVisualizzare.getText();
DefaultListModel listModel = new DefaultListModel();
try {
FileInputStream fstream = new FileInputStream("C:/Users/Franky/Documents/NetBeansProjects/JavaApplication5/src/javaapplication5/Rose/"+fileSquadra+"");
// Get the object of DataInputStream
DataInputStream in = new DataInputStream(fstream);
BufferedReader br = new BufferedReader(new InputStreamReader(in));
String strLine;
//Read File Line By Line
while ((strLine = br.readLine()) != null) {
listModel.addElement(strLine);
System.out.println(strLine);
}
listaRosa.setModel(listModel);
//Close the input stream
in.close();
} catch (Exception e) …Run Code Online (Sandbox Code Playgroud) 我该怎么做?
response.sendRedirect("index.jsp");
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在没有使用javascript或php的情况下从另一个jsp获得一定时间间隔后?
想法是在"error_page.jsp"中显示错误,然后在一段时间后自动将用户重定向到索引页面.提前致谢.
下面是我的代码示例。primeng 多重选择是 primeng 下拉列表的来源:
HTML:
<p-multiSelect [options]="elements" [(ngModel)]="selectedElements" optionLabel="name" display="chip"
(onChange)="onElementChange($event)"></p-multiSelect
<p-dropdown [options]="availableElements" [(ngModel)]="selectedElement" optionLabel="elementID"
placeholder="Select an Element"></p-dropdown>
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TS:
onElementChange(event) {
this.availableElements = [];
this.availableElements = event.value;
}
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从多选下拉列表中选择元素完全有效,但是当我从多选芯片中删除元素时,不会触发 onChange 事件:
如何触发onChange?这是一个不受支持的事件吗?提前致谢。
检查文件是否包含某个字符串或数字的最快方法是什么?
这是我的代码
public String path;
public String fileName;
public static void readData() throws IOException{
try {
path="myPath"
fileName="myFileName";
fstream = new FileInputStream(path+fileName);
br = new BufferedReader(new InputStreamReader(fstream));
//do something...//
}
br.close();
} catch (FileNotFoundException ex) {
JOptionPane.showMessageDialog(null, "Reading file error");
Logger.getLogger(LeggiDaFile.class.getName()).log(Level.SEVERE, null, ex);
}
}
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我想知道如何检查fstream是否存在.如果它不存在,则必须创建新文件.我怎样才能做到这一点?谢谢
从现有的小提琴开始,我创建了这个样本:http://jsfiddle.net/2DaR6/90/
这是html代码:
<div id="accordion">
<h3 id="header1" class="accClicked"><a href="#">Section 1</a></h3>
<div> Good Morning Stackoverflow</div>
<h3 id="header2" class="accClicked"><a href="#">Section 2</a></h3>
<div>Buongiorno Stackoverflow</div>
<h3 id="header3" class="accClicked"><a href="#">Section 3</a></h3>
<div>Bonjour Stackoverflow</div>
</div>
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这是js代码:
$(function() {
var icons = {
header: "ui-icon-circle-arrow-e",
headerSelected: "ui-icon-circle-arrow-s"
};
$( "#accordion" ).accordion({
icons: icons,
collapsible: true
});
$( "#header1" ).click(function() {
$( "#accordion" ).accordion( "option", "icons", false );
}, function() {
$( "#accordion" ).accordion( "option", "icons", icons );
});
});?
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如果我点击第1部分,手风琴正确打开,但我希望点击其他项目,之前打开的项目将不会关闭.我怎样才能获得这种行为?谢谢
在哪里可以找到实现由AsyncToken和AsyncResponder异步调用的HTTPService的Flex应用程序示例?提前致谢
httpservice以一定的频率发送这样的字符串:
行号列#号#行号列#号#行号列#号#....
编辑代码:
<?xml version="1.0" encoding="utf-8"?>
<mx:Application creationComplete="onCreationComplete()"
xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute">
<mx:Script>
<![CDATA[
import mx.rpc.remoting.RemoteObject;
import mx.rpc.events.ResultEvent;
import mx.rpc.events.FaultEvent;
import mx.rpc.http.mxml.HTTPService;
import mx.rpc.AsyncRequest;
import mx.rpc.AsyncResponder;
import mx.rpc.AsyncToken;
import mx.collections.ArrayCollection;
import mx.controls.advancedDataGridClasses.AdvancedDataGridColumn;
import mx.controls.AdvancedDataGrid;
import mx.controls.Alert;
import mx.rpc.IResponder;
[Bindable]
public var dataList:ArrayCollection;
public function getResults(source:String) : ArrayCollection {
var ac:ArrayCollection = new ArrayCollection();
var data:Array = source.split('#');
for (var i:int = 0; i < data.length; i += 3) {
var dataObj:Object = {row: data[i], column: data[i+1], value: data[i+2]};
ac.addItem(dataObj)
}
return …Run Code Online (Sandbox Code Playgroud) apache-flex asynchronous httpresponse httpservice asynctoken
我有一个由.txt文件填充的对象数组
Object[] punteggiTutti = scores.toArray();
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即使可以使用.sort函数:
Arrays.sort(punteggiTutti, Collections.reverseOrder());
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我会知道如何应用一个工作的bubblesort算法; 我尝试了以下不工作的代码:
for(int i=0; i<j; i++)
{
if(punteggiTutti[i]<punteggiTutti[i+1]) // error "<" operator cannot be used in objects
{
temp=punteggiTutti[i];
punteggiTutti[i]=punteggiTutti[i+1];
punteggiTutti[i+1]=temp;
}
}
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