首先引入类
<?php
class DBDA
{
public $host = "localhost"; //服务器地址
public $uid = "root"; //数据库的用户名
public $pwd = "123"; //数据库的密码
//执行SQL语句，返回相应结果的函数
//$sql是要执行的SQL语句
//$type是SQL语句的类型，0代表增删改，1代表查询
//$db代表要操作的数据库
public function Query($sql,$type=1,$db="mydb")
{
//造连接对象
$conn = new MySQLi($this->host,$this->uid,$this->pwd,$db);
//判断连接是否成功
!mysqli_connect_error() or die("连接失败！");
//执行SQL语句
$result = $conn->query($sql);
//判断SQL语句类型
if($type==1)
{
//如果是查询语句返回结果集的二维数组
return $result->fetch_all();
}
else
{
//如果是其他语句，返回true或false
return $result;
}
}
//Ajax调用返回JSON
public function JsonQuery($sql,$type=1,$db="mydb")
{
//定义数据源
$dsn = "mysql:dbname={$db};host={$this->host}";
//造pdo对象
$pdo = new PDO($dsn,"{$this->uid}","{$this->pwd}");
//准备执行SQL语句
$st = $pdo->prepare($sql);
//执行预处理语句
if($st->execute())
{
if($type==1)
{
$attr = $st->fetchAll(PDO::FETCH_ASSOC);
return json_encode($attr);
}
else
{
if($st)
{
return "OK";
}
else
{
return "NO";
}
}
}
else
{
echo "执行失败！";
}
}
//Ajax调用返回字符串
public function StrQuery($sql,$type=1,$db="mydb")
{
//造连接对象
$conn = new MySQLi($this->host,$this->uid,$this->pwd,$db);
//判断连接是否成功
!mysqli_connect_error() or die("连接失败！");
//执行SQL语句
$result = $conn->query($sql);
//判断SQL语句类型
if($type==1)
{
$attr = $result->fetch_all();
$str = "";
//如果是查询语句返回字符串
for($i=0;$i<count($attr);$i++)
{
for($j=0;$j<count($attr[$i]);$j++)
{
$str = $str.$attr[$i][$j];
$str = $str."^";
}
$str = substr($str,0,strlen($str)-1);
$str = $str."|";
}
$str = substr($str,0,strlen($str)-1);
return $str;
}
else
{
//如果是其他语句，返回true或false
if($result)
{
return "OK";
}
else
{
return "NO";
}
}
}
}
返回类型为json
<!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> </body> <script type="text/javascript"> $(document).ready(function(e) { $.ajax({ url:"chuli.php", data:{}, dataType:"JSON", type:"POST", success: function(data){ /* for(key in data) { alert(data[key].Name); }*/ for(var i=0;i<data.length;i++) { alert(data[i].Name); } } }); }); </script> </html>
处理页面
1 <?php 2 3 include("DBDA.php"); 4 $db = new DBDA(); 5 6 $sql = "select * from Nation"; 7 8 echo $db->JsonQuery($sql);
返回类型为text就调用DBDA里的返回字符串的方法
返回类型为xml
<!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" /> <script src="../jquery-1.11.2.min.js"></script> <title>无标题文档</title> </head> <body> </body> <script type="text/javascript"> $(document).ready(function(e) { $.ajax({ url:"chulixml.php", data:{}, dataType:"XML", type:"POST", success: function(data){ alert($(data).find("Name").eq(0).text());//eq(1)时就查处理页面的n2 } }); }); </script> </html>
处理页面
<?php $str = <<<AA <Info> <n1> <Code>n001</Code> <Name>张三</Name> <Sex>男</Sex> </n1> <n2> <Code>n002</Code> <Name>李四</Name> <Sex>女</Sex> </n2> </Info> AA; echo $str; ?>