php连接mysql示例

Posted 2022-06-30

<?php
$servername = "127.0.0.1" ;
$username = "root" ;
$password = "123456" ;

// 创建连接
$conn = new mysqli($servername,$username,$password);
// 检测连接
if ($conn ->connect_error)
die("连接失败".$conn ->connect_error);
echo "数据库连接成功" ;

//创建数据库
$sql = "create database if not exists classdb";
if($conn ->query($sql)==TRUE)
echo"数据库创建成功";
else
die("创建失败：".mysqli_error($conn));

mysqli_select_db( $conn, ‘classdb‘ );
//创建表
$sql1 = "CREATE TABLE IF NOT EXISTS _tbl(
_id INT UNSIGNED AUTO_INCREMENT,
_title VARCHAR(100) NOT NULL,
_author VARCHAR(40) NOT NULL,
PRIMARY KEY ( _id )
)ENGINE=InnoDB DEFAULT CHARSET=utf8;";

$retval = mysqli_query( $conn, $sql1 );
if(! $retval )

die(‘数据表创建失败: ‘ . mysqli_error($conn));

echo "数据表创建成功\n";

?>