PHP Mysqli 常用方法集合

//创建连接

$conn = new mysqli($servername, $username, $password, $dbname);

//检测连接

if ($conn->connect_error)
{
die("Connection failed: " . $conn->connect_error);
}

//获取数据库返回值

if($stmt=$con->prepare("SELECT username,password FROM member WHERE username=? AND password=?"))
{
$stmt->bind_param("ss",$username,$password);
$stmt->execute();
$stmt->bind_result($U,$P);
$HasData=false;
while($stmt->fetch())
{
$HasData=true;
echo "username->".$U." password->".$P."<br>";
}
}

//关闭连接

$conn->close();

//常用语法

INSERT INTO [表名] ([字段1],[字段2]) VALUES ([值1],[值2]);

SELECT * FROM [表名] WHERE [表达式] ORDER BY [字段1],[ASC/DESC 升/降] [字段2],[ASC/DESC 升/降];

DELETE FROM [表名] WHERE [表达式];

UPDATE [表名] SET [字段1]=[值1],[字段2]=[值2] WHERE [表达式];

获取总行数：SELECT COUNT(*) FROM [表]

//中文乱码

//针对页面
header("Content-Type:text/html;charset=utf-8");
//针对数据库
mysqli->query("SET CHARACTER SET 'utf8'");//读库
mysqli->query("SET NAMES 'utf8'");//写库

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