小编Aar*_*ron的帖子

首先,我已经阅读了PHP手册,我已经测试过了.其次我还是不明白它到底是做什么的？为什么我要序列化变量？

我试图用javascript轮询服务器每隔(n)秒如何使用javascript执行此操作？

我试图访问该函数作为person对象的方法为什么它不会访问该方法并执行该函数应该做的事情？

function Person(name, age, location) {
this.name= name;
this.age = age;
this.location = location;
this.test = function() {
    alert("TEST");
};

}   
var Matt = new Person("Matthew", "21", "South Africa");
Matt.test;

例如在C#中你可以使用相同的方法名重载方法但是PHP呢？

 class Database {
    private $dsn;
    private $host;
    private $user;
    private $password;
    private $enckey;

    function __construct($dbname, $host, $user, $password) {
        $this->dsn = "mysql:dbname=" . $dbname . ';host=' . $host;
        $this->user = $user;
        $this->password = $password;
}
    function __construct($dbname, $host, $user, $password, $enckey) {
        $this->dsn = "mysql:dbname=" . $dbname . ';host=' . $host;
        $this->user = $user;
        $this->password = $password;
        $this->enckey = $enckey;
    }
}

嗨是否有一个PHP函数来从数字构建一个字母字符串？

例如

1 = a
2 = b
3 = c

等等？

我在这里我称之为脏数组,这个脏数组需要被过滤,所以它是一个干净的数组,例如

下面是数组.

array
  0 => string '1' (length=1)
  1 => string 'FIRSTNAME A' (length=7)
  2 => string 'LASTNAME B' (length=10)
  3 => string '2011-12-08 16:15:37' (length=19)
  4 => string '2' (length=1)
  5 => string 'FIRSTNAME B' (length=7)
  6 => string 'LASTNAME B' (length=10)
  7 => string '2011-12-08 16:15:43' (length=19)
  8 => string '3' (length=1)
  9 => string 'FIRSTNAME C' (length=7)
  10 => string 'LASTNAME C' (length=10)
  11 => string '2011-12-08 16:15:48' (length=19)
  12 => string '4' (length=1)
  13 => string …

我有一个小的Java文件与postgresql数据库交互,所以我已经下载了驱动程序,并在我导入的文件中org.postgresql.Driver.

在命令控制台中我输入javac Myfilename.java; 然后它编译我运行java Myfilename它会抛出一个错误,说它无法找到org.postgresql.Driver文件.

那么如何在运行文件时导入jar或者在编译文件时不确定何时进行导入？

我试图从以下方法返回一个字符串.

public String openCon() {
    try {
        Scanner scan = new Scanner(System.in);
        URL sitex = new URL("http://" + scan.nextLine());
        URLConnection connection = sitex.openConnection();
        Object content = sitex.getContent();
        BufferedReader in = new BufferedReader(new InputStreamReader(sitex.openStream()));
        String str;
        String x = "1";
        while ((str = in.readLine()) != null) {
          x += str;
        }
        in.close();
        return x;

   }
   catch(Exception e) {
        System.out.println(e);
   }
}

为什么预备语句不会将数据插入数据库表中？

import java.sql.*;

public class MysqlConnect{
public static void main(String[] args) {
  System.out.println("MySQL Connect Example.");
  Connection conn = null;
  String url = "jdbc:mysql://localhost/";
  String dbName = "java";
  String driver = "com.mysql.jdbc.Driver";
  String userName = "root"; 
  String password = "";
  PreparedStatement pst;

  try {
      Class.forName(driver).newInstance();
      conn = DriverManager.getConnection(url+dbName,userName,password);
      conn.setAutoCommit(false);

      String sql = "INSERT INTO test (url) values(?)";
      PreparedStatement statement = conn.prepareStatement(sql);

      statement.setString(1, "teast.com");
      statement.executeUpdate();


      statement.close();




  } 
  catch (Exception e) {
      e.printStackTrace();
  }
 }
}

我希望能够单击一个id为pause的元素来开始计算时间对象中的元素,如果我再次点击暂停,它将停止它并重新点击启动它就像JQuery中的切换功能一样一个setInteval函数我该怎么做呢？

$("#pause").click(function(ffe) {
  if(on == true) {
    on = false 
    alert("on");
  }
  else {
    on = true;
    alert("off");
  }
  if(on == false) {
    setInterval(function() {
      $("#timet ul").append("<li>" + $("#time ul")
                    .children('li').length +"</li>");

    }, 100);
  }
  else {

    alert("Error");
  }
});