php和mysql交互 面向对象

不返回结果集

<?php
//使用对象属性和方法来插入数据
header('Content-type:text/html;carset=utf8');
$con=new mysqli('localhost','root','123456','t3',3306);
$str='insert into tech values (9,"刘海波",132789)';
if($con->connect_error){
    $con->connect_error();
}
$con->set_charset('utf8');
if($con->query($str)==true){
    echo '插入数据成功';
}else{
    echo 'ERRPR'.$str.$con->error;
}

$con->close();

?>

返回结果集

<?php
//使用对象属性和方法来插入数据
header('Content-type:text/html;carset=utf8');
$con=new mysqli('localhost','root','123456','t3',3306);
$str='select * from tech';
if($con->connect_error){
    $con->connect_error();
}
$con->set_charset('utf8');
$result=$con->query($str);
//fetch_assoc 返回数组
while($jieguo=$result->fetch_assoc()){

    echo $jieguo['id'].'-------'.$jieguo['name'].'---------'.$jieguo['pwd'].'--------'.'<br>';
}

$con->close();

?>

预处理机制

<?PHP

    header('Content-type:text/html;charset=utf8');

    $con=new mysqli('localhost','root','123456','t3');
    if($con->connect_error){
        die('连接失败'.$con->connect_error);
    }
    $con->set_charset('utf8');
    $query='insert into tech values (?,?,?)';
    //预备sql处理函数 返回一个数据库类型对象
    $stmt=$con->prepare($query);
    $stmt->bind_param('isi',$fid,$fname,$fpwd);
    $fid=10;
    $fname="祁筱以";
    $fpwd=456852;
    $stmt->execute();

    echo '插入成功';
    //释放类型数据库对象结果集
    $stmt->free_result();
    //关闭数据库连接
    $con->close();

?>

预处理机制返回结果

　　

<?PHP

    header('Content-type:text/html;charset=utf8');

    $con=new mysqli('localhost','root','123456','t3');
    if($con->connect_error){
        die('连接失败'.$con->connect_error);
    }
    $con->set_charset('utf8');
    $query='select * from tech where id>?';
    //预备sql处理函数 返回一个预编译的sql对象
    $stmt=$con->prepare($query);
    $stmt->bind_param('i',$fid);
    $fid=1;

    $stmt->execute();
    //预编译sql对象绑定结果
    $stmt->bind_result($id,$name,$pwd);
    while($stmt->fetch()){
        echo "{$id}->{$name}->{$pwd}<br>";
    }

    $stmt->free_result();
    //关闭数据库连接
    $con->close();

?>