<?php 
//造連接對(duì)象
$db = new MySQLi("localhost","root","","0710_test");

//寫SQL語(yǔ)句
$sql = "select * from student";
//檢測(cè)連接數(shù)據(jù)庫(kù)是否成功，失敗返回“連接失敗”，并退出程序 
if(mysqli_connect_error()){
 die("連接失敗"); 
}
//執(zhí)行SQL語(yǔ)句,返回結(jié)果集對(duì)象
$result = $db->query($sql);
var_dump($result->num_rows);
//判斷結(jié)果有無(wú)數(shù)據(jù)
if($result->num_rows){
 echo "存在數(shù)據(jù)";
}
//取數(shù)據(jù)（查詢語(yǔ)句）
//$arr = $result->fetch_all();//獲取所有數(shù)據(jù)并以二維數(shù)組存在
//$arr = $result->fetch_all(MYSQLI_ASSOC);//獲取所有數(shù)據(jù)中的關(guān)聯(lián)數(shù)組
//$arr = $result->fetch_array();

//while循環(huán)遍歷數(shù)組所有數(shù)據(jù)
while($arr = $result->fetch_array()){
 var_dump($arr);
}

//$arr = $result->fetch_assoc();//返回關(guān)聯(lián)數(shù)組
//$arr = $result->fetch_object();//列名對(duì)應(yīng)成員變量
//$arr = $result->fetch_row();//返回索引數(shù)組
//var_dump($arr);
 
//增刪改語(yǔ)句
//添加一條數(shù)據(jù)(返回值true或false)
$sql = "insert into student values('102','王某','男','1987-7-1','95033')";
//刪除一條數(shù)據(jù)(返回值true或false)
$sql = "delete from student where Sname='李軍'";
$r = $db->query($sql);
var_dump($r);
?>