Php 未选择数据库-错误
我使用以下示例代码:Php 未选择数据库-错误,php,mysql,insert,Php,Mysql,Insert,我使用以下示例代码: <?php // Create connection $conn = mysqli_connect('mysql3.00*****', 'a7552070******', 'fjewifn****'); // Check connection if (!$conn) { die("Connection failed: " . mysqli_connect_error()); } $sql = "INSERT INTO diequizapp(appid, itemi
<?php
// Create connection
$conn = mysqli_connect('mysql3.00*****', 'a7552070******', 'fjewifn****');
// Check connection
if (!$conn) {
die("Connection failed: " . mysqli_connect_error());
}
$sql = "INSERT INTO diequizapp(appid, itemid, data) VALUES ('John', 'bon', 'jovi')";
if (mysqli_query($conn, $sql)) {
echo "New record created successfully";
} else {
echo "Error: " . $sql . "<br>" . mysqli_error($conn);
}
mysqli_close($conn);
?>
您需要传递要从中选择数据作为mysqli\u connect(主机、用户名、密码、数据库)中最后一个参数的数据库。
您也可以采用第二种方法,并使用mysqli\u select\u db($connection,DATABASE)
函数
$dbname = "****"; //database name
$dbhost = "localhost"; // host name localhost
$dbusername = "***"; // username of the mysql
$dbpassword = "***"; // password of the mysql
$link = mysqli_connect($dbhost,$dbusername,$dbpassword,$dbname);
if (mysqli_connect_errno($link))
{
echo "Failed to connect to MySQL: " . mysqli_connect_error();
}
然后运行您的查询