20181009 用一个类封装一个连接数据库的方法

需要两个PHP文件

index.PHP

mysql.class.PHP

index.PHP代码

<?php
# 比赛列表
header('Content-Type: text/html; charset=utf-8');
include "mysql.class.php";
$config=[
	"host"=>"localhost",
	"name"=>"root",
	"pwd"=>"",
	"DbName"=>"z_075mvc"
];
$db=new mysqlDb($config);
//获得比赛列表数据
$sql = "select t1.t_name as t1_name, m.t1_score, m.t2_score, t2.t_name as t2_name, m.m_time from `match` as m left join `team` as t1 ON m.t1_id = t1.t_id  left join `team` as t2 ON m.t2_id=t2.t_id";
$match_list = $db->getAssoc($sql);

?>
<!-- 利用HTML代码展示数据 -->
<!DOCTYPE html>
<html lang="en">
<head>
	<meta charset="UTF-8">
	<title>比赛列表</title>
</head>
<body>

<table>
<tr>
<th>球队一</th><th>比分</th><th>球队二</th><th>时间</th>
</tr>
<?php foreach($match_list as $row) : ?>
	<tr>
	<td><?php echo $row['t1_name'];?></td>
	<td><?php echo $row['t1_score'];?>:<?php echo $row['t2_score'];?></td>
	<td><?php echo $row['t2_name'];?></td>
	<td><?php echo date('Y-m-d H:i', $row['m_time']);?></td>
	</tr>
<?php endForeach;?>
</table>	
</body>
</html>

mysql.class.PHP代码

<?php
class mysqlDb{
    public $host; //服务器地址
    public $post=3306; //端口
    public $name; //用户名
    public $pwd; //m密码
    public $DbName; //数据库名称
    public $charset;//默认编码
    
    public $link;//数据库连接对象
    public $res; //资源   返回结果集
    
    function __construct($config){
        /*初始化参数*/
        $this->host = $config["host"] ? $config["host"] : "localhost";
        $this->name = $config["name"] ? $config["name"] : "root";    
        $this->pwd = $config["pwd"] ? $config["pwd"]  : "";
        $this->DbName = $config["DbName"] ?  $config["DbName"] : "mysql";
        $this->charset = $config["charset"] ?$config["charset"] : "utf8" ;
        
        /*连接数据库  设置字符集*/
        $this->connectMysql();
        $this->setCharSet();
    }
    
    /*连接数据库*/
    function connectMysql(){
        $this->link = new MySQLi($this->host,$this->name,$this->pwd,$this->DbName);
        !mysqli_connect_error() or die("连接数据库失败");
    }
    
    /*设置字符集*/
    function setCharSet(){
        $this->link->query("set names ".$this->charset );
    }
    
    /*执行sql语句的方法*/
    function DbQuery($sql){
        $this->res = $this->link->query($sql);
        if(!$this->res){
            echo ("<br />执行失败。");
            echo "<br />失败的sql语句为：" . $sql;
            echo "<br />出错信息为：" . mysqli_error($this->link);
            echo "<br />错误代号为：" . mysqli_errno($this->link);
            die;
        }
        return $this->res;
    }
   //返回字符串
    function getStr($sql){
        $zhi = $this->DbQuery($sql);
        //将结果集转为字符串
        $arr = $zhi->fetch_all();
        $brr = array();
        foreach($arr as $v){
            $brr[] = implode(",",$v);
        }
        return implode("^",$brr);
    }

    //返回json
    function getJson($sql){
        $zhi = $this->DbQuery($sql);
        $brr = array();
        while($row = $zhi->fetch_assoc()){
            $brr[] = $row;
        }
        return json_encode($brr);
    }
    /*返回关联数组*/
    function getAssoc($sql){
        $zhi = $this->DbQuery($sql);
        $brr = array();
        while($row = $zhi->fetch_assoc()){
            $brr[] = $row;
        }
        return $brr;
    }
    //返回索引数组
    function getAttr($sql){
        $zhi = $this->DbQuery($sql);
        return $zhi->fetch_all();
    }

}

四个返回数据的方式想用哪个都可以调

效果图

20181009 用一个类封装一个连接数据库的方法

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