問題：ASP、JSP、PHP和CGI是常見的Web開發(fā)技術(shù)，它們各自有著不同的特點和用途。本文將對這些技術(shù)進行簡要的介紹和比較，以幫助讀者了解它們的優(yōu)勢和適用場景。
結(jié)論：ASP、JSP、PHP和CGI都是用于服務(wù)器端腳本開發(fā)的技術(shù)，它們可以與HTML頁面結(jié)合，實現(xiàn)動態(tài)內(nèi)容的生成和交互功能。下面將對它們進行詳細的介紹。
ASP（Active Server Pages）：ASP是由微軟推出的一種服務(wù)器端腳本技術(shù)，它使用VBScript或JScript作為腳本語言，在IIS服務(wù)器上運行。ASP具有良好的兼容性和易用性，以及強大的數(shù)據(jù)庫連接功能。例如，下面的代碼演示了使用ASP連接MySQL數(shù)據(jù)庫并查詢數(shù)據(jù)的過程：
<%
'連接數(shù)據(jù)庫
Dim conn, rs
Set conn = Server.CreateObject("ADODB.Connection")
conn.Open "DRIVER={MySQL ODBC 5.3 Driver};SERVER=localhost;DATABASE=test;UID=root;PWD=123456;OPTION=3"
'查詢數(shù)據(jù)
Set rs = Server.CreateObject("ADODB.Recordset")
rs.Open "SELECT * FROM users", conn
'輸出結(jié)果
Do Until rs.EOF
Response.Write rs("username") & "<br>"
rs.MoveNext
Loop
'釋放資源
rs.Close
Set rs = Nothing
conn.Close
Set conn = Nothing
%><%@ page import="java.sql.*" %>
<%
//連接數(shù)據(jù)庫
String url = "jdbc:mysql://localhost/test";
String user = "root";
String password = "123456";
Connection conn = DriverManager.getConnection(url, user, password);
//查詢數(shù)據(jù)
Statement stmt = conn.createStatement();
ResultSet rs = stmt.executeQuery("SELECT * FROM users");
//輸出結(jié)果
while(rs.next()){
out.println(rs.getString("username") + "<br>");
}
//釋放資源
rs.close();
stmt.close();
conn.close();
%><?php
//連接數(shù)據(jù)庫
$servername = "localhost";
$username = "root";
$password = "123456";
$dbname = "test";
$conn = new mysqli($servername, $username, $password, $dbname);
//查詢數(shù)據(jù)
$sql = "SELECT * FROM users";
$result = $conn->query($sql);
//輸出結(jié)果
if ($result->num_rows >0) {
while($row = $result->fetch_assoc()) {
echo $row["username"] . "<br>";
}
}
//釋放資源
$result->close();
$conn->close();
?>#!/usr/bin/perl
use strict;
use warnings;
use DBI;
#連接數(shù)據(jù)庫
my $dsn = "DBI:mysql:database=test;host=localhost";
my $user = "root";
my $password = "123456";
my $dbh = DBI->connect($dsn, $user, $password) or die $DBI::errstr;
#查詢數(shù)據(jù)
my $sql = "SELECT * FROM users";
my $sth = $dbh->prepare($sql);
$sth->execute();
#輸出結(jié)果
while (my @row = $sth->fetchrow_array()) {
print $row[1] . "<br>";
}
#釋放資源
$sth->finish();
$dbh->disconnect();