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结合mysql+redis+ajax来简单的获取数据

程序员文章站 2022-06-03 08:15:17
结合mysql+redis+ajax来简单获取数据

结合mysql+redis+ajax来简单获取数据

<?php 
header("content-type:text/html;charset=utf8");
//version 1
$redis = new redis();
$redis->connect('127.0.0.1',6379);
$arr = $redis->get('data_from_class_all');
if(!empty($arr)){
  $data = $arr;
}
else{
  $dsn = "mysql:host=localhost;dbname=demo";
  $db = new pdo($dsn, 'root', '');
  $db->query("set names utf8");
  $data=$db->query('select * from `type`')->fetchall(pdo::fetch_assoc); 
  if(!empty($data)){
    $redis->set('data_from_class_all',$data);
  }
}

//version 2
$data = getdata();
print_r($data);die;


//获取数据
function getdata(){
  // to do somthing...
  $redisobj = getredisinstance();
  $redisdata = getredisstr($redisobj, 'data_from_class_all');
  if(!empty($redisdata)){
    $data = $redisdata;
  }else{
    $db = getmysqlinstance();
    $data = getmysqldataall($db);
    if(!empty($data)){
      setredisstr($redisobj, 'data_from_class_all', serialize($data));
    }
  }


  return $data;
}


// 获取redis实例
function getredisinstance(){
  $redis = new redis();
  $redis->connect('127.0.0.1', 6379);


  return $redis;
}


// 设置redis的string类型值
function setredisstr($redisobj, $rediskey, $data){
  $redisobj->set($rediskey,$data);
}




// 获取redis的string类型值
function getredisstr($redisobj, $rediskey){
  $redisdata = $redisobj->get($rediskey);
  return unserialize($redisdata);
}


// 获取mysql的实例
function getmysqlinstance(){
  $dsn = "mysql:host=localhost;dbname=demo";
  $db = new pdo($dsn, 'root', '');
  $db->query("set names utf8");


  return $db;
}


// 获取mysql的数据
function getmysqldataall($db){
  return $db->query('select * from `type`')->fetchall(pdo::fetch_assoc);
}

?>

<!doctype <html></html>
<html>
<head>
	<link rel="stylesheet" type="text/js" href="./jquery-1.7.2.js">
	<script type="text/javascript" src="./jquery-1.7.2.js"></script>
	<title>分类展示</title>
</head>
<body>
<dl>
<?php for ($i=0; $i <count($data) ; $i++) { ?>
<a onclick="zs('<?php echo $data[$i]['t_id']?>')"><?php echo $data[$i]['title'] ?></a> <br>
<?php } ?>  
</dl>
<span id="box1"></span>
</body>
</html>
<script type="text/javascript">
function zs(id){
	$.ajax({
   type: "post",
   url: "select.php",
   data: "id="+id,
   success: function(msg){
   var box="";
   var jsonreturn = eval("("+msg+")");
   for(var i=0;i<jsonreturn.length;i++){
   		box=box+"<li>";
     for(var key in jsonreturn[i]){
             box=box+jsonreturn[i][key]+"&nbsp;&nbsp;&nbsp;&nbsp;";
     }
     box=box+"</li>";
    }
   $("#box1").html(box);
}
});
}
</script>

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