<?php
//造一個mysqli對象，造連接對象
$db=new MySQLi("localhost","root","12345678","heiheihei");
//括號里面填的是IP地址域名，用戶名，密碼，數(shù)據(jù)庫的名字
  //準備一條SQL語句
$sql = "select * from student";
//執(zhí)行SQL語句,如果是查詢語句。成功返回結(jié)果及對象
$reslut = $db->query($sql);
//判斷返回是否有內(nèi)容,執(zhí)行成功
if($reslut)
{
//如果成功了，從結(jié)果集對象里找到數(shù)據(jù)；
  $attr = $reslut->fetch_all();
//返回索引數(shù)組：$attr = $reslut->fetch_row()
//返回關(guān)聯(lián)數(shù)組：tch_assoc();
//返回對象：$attr = $reslut->fetch_object();
//返回既有索引又有關(guān)聯(lián)：$arrt = $reslut->fetch_array();
  var_dump($attr);
?>

//造連接對象
$db = new MySQLi("localhost","root","12345678","heiheihei");
//準備SQL語句
$sql = "insert into cou values('3-111','嘿嘿','803')";
  //執(zhí)行SQL語句
$r = $db ->query($sql);
if($r)//如果$r是ture
{
  echo "執(zhí)行成功";
}
else {
  echo "執(zhí)行失敗";
}

<?php
//造連接對象
$db = new MySQLi("localhost","root","12345678","heiheihei");
//準備SQL語句
$sql = "update cou set cname='哈哈' where tno='803'";
  //執(zhí)行SQL語句
$r = $db ->query($sql);
if($r)
{
  echo "執(zhí)行成功";
}
else {
  echo "執(zhí)行失敗";
}
?>

<?php
//造連接對象
$db = new MySQLi("localhost","root","12345678","heiheihei");
//準備SQL語句
$sql = "delete from cou where tno='803'";
  //執(zhí)行SQL語句
$r = $db ->query($sql);
if($r)
{
  echo "執(zhí)行成功";
}
else {
  echo "執(zhí)行失敗";
}
?>