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建立mydbda数据库封装类
mydbda.php
<?php class mydbda { var $host = "localhost"; var $username = "root"; var $password = "123"; var $database = "mydb"; /** 功能：执行SQL语句，返回结果 参数：$sql:要执行的SQL语句 $type：SQL语句的类型，CX代表查询，QT代表其他 $data:要操作的数据库 返回值：如果是查询，返回结果集 如果是其他语句，执行成功返回OK，失败返回NO */ function Select($sql,$type,$data) { //1.造连接对象 $db = new mysqli($this->host,$this->username,$this->password,$data); //2.判断是否连接成功 if(mysqli_connect_error()) { echo "连接失败"; //退出整个程序 exit; } else { //4.执行SQL语句 $result = $db->query($sql); if($type == "CX") { $str = ""; while($row = $result->fetch_row()) { for($i=0;$i<count($row);$i++) { $str=$str.$row[$i]."^"; } $str = substr($str,0,strlen($str)-1); $str = $str."|"; } $str = substr($str,0,strlen($str)-1); return $str; } else { if($result) { return "OK"; } else { return "NO"; } } } } } ?>
处理界面源代码
chuli.php
<?php include("mydbda.php"); /*$uid = $_POST["uid"]; $pwd = $_POST["pwd"]; //1.造连接对象 $db = new mysqli("localhost","root","123","mydb"); //2.判断是否连接成功 if(mysqli_connect_error()) { echo "连接失败"; //退出整个程序 exit; } else { $sql = "select count(*) from login where UserName=‘".$uid."‘ and Password=‘".$pwd."‘"; $result = $db->query($sql); $row = $result->fetch_row(); if($row[0]==0) { echo "用户名或密码错误"; } else { echo "OK"; } }*/ $uid = $_POST["uid"]; $db = new mydbda(); $sql = "select count(*) from login where UserName=‘".$uid."‘"; $str = $db->Select($sql,"CX","mydb"); echo $str; ?>
主界面源代码
testajax.php
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <title>无标题文档</title> <script src="jquery-1.11.2.min.js"></script> </head> <body> <h1>登录界面</h1> <div>用户名：<input type="text" id="uid"/></div> <div>密码：<input type="text" id="pwd"/></div> <div><input type="button" id="btn" value="登录"/></div> <br /> 用户名： <input type="text" id="uidz"/> <div style="color:red" id="xs"></div> </body> <script type="text/javascript"> $(document).ready(function(e) { $("#uidz").blur(function(){ var uid = $(this).val(); $.ajax({ url:"chuli.php", data:{uid:uid}, dataType:"TEXT", type:"POST", success: function(data){ if(data=="1") { $("#xs").text("该用户名已经存在！"); } else { $("#xs").text(""); } } }); }) $("#btn").click(function(){ var uid = $("#uid").val(); var pwd = $("#pwd").val(); $.ajax({ url:"chuli.php", data:{uid:uid,pwd:pwd}, type:"POST", dataType:"TEXT", success: function(data){ if(data == "OK") { window.location = "index.php"; } else { alert(data); } } }); }) }); </script> </html>
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原文地址：http://www.cnblogs.com/fangchongyan/p/5205159.html
