php鏈接mysql示例

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

// 建立鏈接
$conn = new mysqli($servername,$username,$password);
// 檢測鏈接
if ($conn ->connect_error){
die("鏈接失敗".$conn ->connect_error);
} echo "數據庫鏈接成功" ;

//建立數據庫
$sql = "create database if not exists classdb";
if($conn ->query($sql)==TRUE){
echo"數據庫建立成功";
}else {
die("建立失敗：".mysqli_error($conn));
}

mysqli_select_db( $conn, 'classdb' );
//建立表
$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(! $retval )
{
die('數據表建立失敗: ' . mysqli_error($conn));
}
echo "數據表建立成功\n";

?>