PHP鏈接MySQL數據庫

1.鏈接數據庫：

<?php
	$conn = @mysql_connect("localhost", "-u", "-p") or die("數據庫鏈接錯誤");
	mysql_select_db("數據庫名", $conn);
	mysql_query("set names 'UTF8'"); 
?>

 

2.查詢：

<?php
		include("connection.php");
		$username=$_COOKIE['username'];
		$sql="select * from message where user='$username'";
		$query=mysql_query($sql);
		while($row=mysql_fetch_array($query)){}
?>

3.增加：

<?php
			include("connection.php");
			if(isset($_POST['submit']))
			{
				$sql="insert into message(id,user,title,content,lastdate) values('','$_COOKIE[username]','$_POST[title]','$_POST[content]',now())";
				mysql_query($sql);
				if(mysql_affected_rows($conn))
			 	   echo "<script>alert('插入成功！');</script>";
				else
					echo "<script>alert('插入失敗！');</script>";
			}
		?>

4.刪除：

<?php
	include("connection.php");	
	if(isset($_POST['tid']))
	{
		
		$delete_sql = "delete from message where id =$_POST[tid]";
		mysql_query($delete_sql);
		if(mysql_affected_rows($conn))
			echo "<script>alert('刪除成功！'););location.href='listone.php';</script>";
		else
			echo "<script>alert('刪除失敗！'););location.href='listone.php';</script>";
		
	}
?>

5.更新：

<?php
		include("connection.php");
		if(isset($_POST['submit']))
		{
			$sql="update message set title='$_POST[title]',content='$_POST[content]',lastdate=now() where id =$_POST[tid]";
			mysql_query($sql);
			if(mysql_affected_rows($conn))
				echo "<script>alert('更新成功!');</script>";
			else
				echo "<script>alert('更新失敗！');</script>";
			}
?>