PHP链接数据库的步骤

PHP链接数据库的步骤

<?php

//1链接数据库
$link = @mysqli_connect('localhost','root','123456');

//2判断错误
if (mysqli_connect_errno($link)) {
echo mysqli_connect_error($link);exit;
}

//3选择数据库
mysqli_select_db($link,'demo');

//4选择字符集
mysqli_set_charset($link,'utf8');

//5准备sql语句
//查询语句
$sql = "SELECT name FROM users";
//增删改语句
$sql = "INSERT INTO users(id,name) VALUES(NULL,'jake')";

//6发送sql语句
$result = mysqli_query($link,$sql);

//7处理结果集
//取得查询结果集的总数(查询)
mysqli_num_rows($result);
//返回影响的行数(增删改)
mysqli_affected_rows($result);

//8关闭数据库
mysqli_close($link);

?>