php ->connect_error

<?php 

//创建连接
$conn = new mysqli("localhost","root","");
//检测连接
if ($conn->connect_error)
{
    die("连接失败：".$conn->connect_error);
}
$sql = "create database namelist";
if ($conn->query($sql) === TRUE)
{
    echo "连接成功";
}else 
{
    echo "连接异常：".$conn->error;
}

$conn->close();

?>

 

删除数据库是：

<?php 

//创建连接
$conn = new mysqli("localhost","root","");
//检测连接
if ($conn->connect_error)
{
    die("连接失败：".$conn->connect_error);
}
$sql = "drop database namelist";
if ($conn->query($sql) === TRUE)
{
    echo "删除成功";
}else 
{
    echo "连接异常：".$conn->error;
}

$conn->close();

?>