如何使用100个随机值在Perl中生成数组,而不使用循环？
我必须避免所有类型的循环,例如"for",foreach",while.这是我的练习,来自我的实验室.我找不到解决这个问题的方法,因为我是Perl的新手.
在C中,生成这个数组非常容易,但我不知道如何在Perl中实现它.
我很久没厌倦了.我不知道是什么原因造成了这个错误.这是我的文件:
Uzytkownik.hbm.xml
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<hibernate-mapping>
<class name="Uzytkownik" table="uzytkownicy">
<id column="id" name="id" type="int"/>
<property column="login" generated="never" lazy="false" name="login" type="string"/>
<property column="haslo" generated="never" lazy="false" name="haslo" type="string"/>
</class>
</hibernate-mapping>
hibernate.cfg.xml中:
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-configuration PUBLIC "-//Hibernate/Hibernate Configuration DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
<session-factory name="">
<property name="hibernate.connection.driver_class">org.gjt.mm.mysql.Driver</property>
<property name="hibernate.connection.password">root</property>
<property name="hibernate.connection.url">jdbc:mysql://localhost/sprawozdania</property>
<property name="hibernate.connection.username">root</property>
<property name="hibernate.dialect">org.hibernate.dialect.MySQL5Dialect</property>
<mapping resource="com/vaannila/uzytkownik/Uzytkownik.hbm.xml"/>
</session-factory>
</hibernate-configuration>
我使用mysql 5.5.
我收到以下错误:
Exception in thread "main" java.lang.ExceptionInInitializerError
at com.vaannila.util.HibernateUtil.<clinit>(HibernateUtil.java:14)
at com.vaannila.uzytkownik.Main.saveUzyt(Main.java:22)
at com.vaannila.uzytkownik.Main.main(Main.java:16)
Caused by: …嗨,我正在写一个简单的客户端 - 服务器程序.在这个程序中,我必须使用getopt()这样获取端口号和IP地址:
server -i 127.0.0.1 -p 10001
我不知道如何从optarg中获取值,以便稍后在程序中使用.
我已经将PyDev插件安装到了Eclipse中.当我创建新的python项目时,我必须切换到Python视图.不幸的是我收到这条消息:
Could not create the view: An unexpected exception was thrown.
java.lang.RuntimeException: Can't find id: org.eclipse.jst.servlet.ui.EnhancedJavaRendering
at org.eclipse.ui.internal.navigator.extensions.NavigatorContentDescriptorManager.findId(NavigatorContentDescriptorManager.java:459)
at org.eclipse.ui.internal.navigator.extensions.NavigatorContentDescriptorManager.computeSequenceNumbers(NavigatorContentDescriptorManager.java:476)
at org.eclipse.ui.internal.navigator.extensions.NavigatorContentDescriptorManager.access$0(NavigatorContentDescriptorManager.java:462)
at org.eclipse.ui.internal.navigator.extensions.NavigatorContentDescriptorManager$NavigatorContentDescriptorRegistry.readRegistry(NavigatorContentDescriptorManager.java:512)
at org.eclipse.ui.internal.navigator.extensions.NavigatorContentDescriptorManager.<init>(NavigatorContentDescriptorManager.java:130)
at org.eclipse.ui.internal.navigator.extensions.NavigatorContentDescriptorManager.<clinit>(NavigatorContentDescriptorManager.java:44)
at org.eclipse.ui.internal.navigator.NavigatorContentService.<clinit>(NavigatorContentService.java:93)
at org.eclipse.ui.navigator.CommonViewer.<init>(CommonViewer.java:96)
at org.python.pydev.navigator.ui.PydevPackageExplorer$PydevCommonViewer.<init>(PydevPackageExplorer.java:77)
at org.python.pydev.navigator.ui.PydevPackageExplorer.createCommonViewer(PydevPackageExplorer.java:174)
at org.eclipse.ui.navigator.CommonNavigator.createPartControl(CommonNavigator.java:193)
at org.python.pydev.navigator.ui.PydevPackageExplorer.createPartControl(PydevPackageExplorer.java:188)
at org.eclipse.ui.internal.ViewReference.createPartHelper(ViewReference.java:375)
at org.eclipse.ui.internal.ViewReference.createPart(ViewReference.java:229)
at org.eclipse.ui.internal.WorkbenchPartReference.getPart(WorkbenchPartReference.java:595)
at org.eclipse.ui.internal.PartPane.setVisible(PartPane.java:313)
at org.eclipse.ui.internal.ViewPane.setVisible(ViewPane.java:534)
at org.eclipse.ui.internal.presentations.PresentablePart.setVisible(PresentablePart.java:180)
at org.eclipse.ui.internal.presentations.util.PresentablePartFolder.select(PresentablePartFolder.java:270)
at org.eclipse.ui.internal.presentations.util.LeftToRightTabOrder.select(LeftToRightTabOrder.java:65)
at org.eclipse.ui.internal.presentations.util.TabbedStackPresentation.selectPart(TabbedStackPresentation.java:473)
at org.eclipse.ui.internal.PartStack.refreshPresentationSelection(PartStack.java:1245)
at org.eclipse.ui.internal.PartStack.setSelection(PartStack.java:1198)
at org.eclipse.ui.internal.PartStack.showPart(PartStack.java:1597)
at org.eclipse.ui.internal.PartStack.createControl(PartStack.java:643)
at org.eclipse.ui.internal.PartStack.createControl(PartStack.java:570)
at org.eclipse.ui.internal.PartSashContainer.createControl(PartSashContainer.java:568)
at org.eclipse.ui.internal.PerspectiveHelper.activate(PerspectiveHelper.java:272)
at org.eclipse.ui.internal.Perspective.onActivate(Perspective.java:981)
at org.eclipse.ui.internal.WorkbenchPage.setPerspective(WorkbenchPage.java:3713)
at org.eclipse.ui.internal.WorkbenchPage.busyResetPerspective(WorkbenchPage.java:1046)
at org.eclipse.ui.internal.WorkbenchPage.access$13(WorkbenchPage.java:950) …我有个问题.已经挣扎了很长时间.这是我的代码:
package com.XYZ.spr.server;
import org.apache.commons.mail.Email;
import org.apache.commons.mail.SimpleEmail;
public class GeneratorMaili {
public static final String HOSTNAME = "smtp.XYZ.com";
public static final String ADDRESS_FROM = "user@XYZ.com";
public static final String TOPIC= "Topic";
public static void wyslijEmail(String reciver) throws Exception {
System.setProperty("javax.net.ssl.trustStore", "cacerts");
System.setProperty("javax.net.ssl.trustStorePassword", "changeit");
Email email = new SimpleEmail();
email.setSmtpPort(587);
// email.setTLS(true);
email.setSSL(true);
System.out.println("fdfdf");
email.setAuthentication("user@.XYZ.pl", "pass");
email.setDebug(true);
email.setHostName(HOSTNAME);
email.setFrom(ADDRESS_FROM);
email.setSubject(TOPIC);
email.setMsg("Test");
email.addTo(reciver);
System.out.println(reciver);
email.send();
System.out.println("Ok!");
}
}
我的证书有问题.以下是我所做的步骤:
我遇到了JasperReports的问题.尝试从数据库下载数据时,出现此错误:
net.sf.jasperreports.engine.JRException: Error retrieving field value from bean : mybean
at net.sf.jasperreports.engine.data.JRAbstractBeanDataSource.getBeanProperty(JRAbstractBeanDataSource.java:123)
at net.sf.jasperreports.engine.data.JRAbstractBeanDataSource.getFieldValue(JRAbstractBeanDataSource.java:96)
at net.sf.jasperreports.engine.data.JRBeanCollectionDataSource.getFieldValue(JRBeanCollectionDataSource.java:100)
at net.sf.jasperreports.engine.fill.JRFillDataset.setOldValues(JRFillDataset.java:821)
at net.sf.jasperreports.engine.fill.JRFillDataset.next(JRFillDataset.java:785)
at net.sf.jasperreports.engine.fill.JRBaseFiller.next(JRBaseFiller.java:1482)
at net.sf.jasperreports.engine.fill.JRVerticalFiller.fillReport(JRVerticalFiller.java:126)
at net.sf.jasperreports.engine.fill.JRBaseFiller.fill(JRBaseFiller.java:946)
at net.sf.jasperreports.engine.fill.JRBaseFiller.fill(JRBaseFiller.java:864)
at net.sf.jasperreports.engine.fill.JRFiller.fillReport(JRFiller.java:84)
at net.sf.jasperreports.engine.JasperFillManager.fillReport(JasperFillManager.java:624)
at net.sf.jasperreports.engine.JasperFillManager.fillReport(JasperFillManager.java:540)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:617)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:487)
at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:362)
at org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216)
at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:181)
at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:729)
at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:405)
at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
at org.mortbay.jetty.handler.RequestLogHandler.handle(RequestLogHandler.java:49)
at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
at org.mortbay.jetty.Server.handle(Server.java:324)
at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:505)
at org.mortbay.jetty.HttpConnection$RequestHandler.headerComplete(HttpConnection.java:829)
at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:513)
at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:211)
at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:380)
at org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:395)
at org.mortbay.thread.QueuedThreadPool$PoolThread.run(QueuedThreadPool.java:488)
Caused by: java.lang.NoSuchMethodException: Unknown property 'mybean' on class …这是我服务器的代码:
#include <stdio.h>
#include <stdlib.h>
#include <getopt.h>
#include <string.h>
#include <unistd.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <sys/wait.h>
#include <signal.h>
int main (int argc, char **argv)
//------------------------MAIN--------------------------//
{
int sock; // sock descriptor
int new_sock;
int c;
int sin_size;
int koniec = 0;
char *ip_address;
char *port_number;
while (1)
{
static struct option OpcjeProgramu[] =
{
{ "port", required_argument, 0, 'p'},
{ "interface", required_argument, 0, 'i'},
{ 0, 0,0,0 }
};
int option_index = 0; …我无法找到为什么此查询不起作用的答案:
$query = pg_query($connect, sprintf("INSERT INTO table (uid, urzid, time_start, time_stop2, date_start, date_stop, cycle) VALUES ($uid, $pom, '$time1', '$time2', '$data1', '$data2', $cykl)"));
我收到一个警告:PG_QUERY()[FUNCTION.PG-QUERY]:QUERY FAILED:ERROR:SYNTAX ERROR在或附近","在角色96
在我看来,错误与.''$ time1,$ Time2和$ date1,$ date2符合日期和时间的格式.