使用预处理语句实现数据查询的方法

查询数据库里面有多少条数据

$m=new mysqli(‘localhost‘,‘root‘,‘‘,‘db‘);

$m->set_charset(‘utf8‘);

$stmt=$m->prepare(‘select count(*) from stu‘);

$stmt->execute();

$stmt->bind_result($c);

$stmt->fetch();

echo $c;

$stmt->free_result();

$stmt->close();

$m->close();

使用预处理语句实现数据的查询方法一：

$m=new mysqli(‘localhost‘,‘root‘,‘‘,‘db‘);
$m->set_charset(‘utf8‘);
$stmt=$m->prepare(‘select * from stu where 1=1‘);
$stmt->execute();
$stmt->bind_result($id,$name,$sgender,$sscore);
while($stmt->fetch()){
	echo "$id,$name,$sgender,$sscore".‘<br>‘;
}
$stmt->free_result();
$stmt->close();
$m->close();

使用预处理语句实现数据的查询方法二：

$m=new mysqli(‘localhost‘,‘root‘,‘‘,‘db‘);
$m->set_charset(‘utf8‘);
$stmt=$m->prepare(‘select * from stu where 1=1‘);
$stmt->execute();
$result=$stmt->get_result();
$rows=$result->fetch_all(2);
foreach($rows as $v){
    print_r($v).‘<br>‘;
}

$stmt->free_result();
$stmt->close();
$m->close();

使用预处理语句实现数据的查询方法三：

$m=new mysqli(‘localhost‘,‘root‘,‘‘,‘db‘);

$m->set_charset(‘utf8‘);

$stmt=$m->prepare(‘select * from stu where sid=?‘);

$n=10;

$stmt->bind_param(‘i‘,$n);

$stmt->execute();

$stmt->bind_result($id,$name,$sgender,$sscore);

$stmt->fetch();

echo $id,$name,$sgender,$sscore;

$stmt->free_result();

$stmt->close();

$m->close();

来自为知笔记(Wiz)