<?php
//=================================连接MYSQL
function link_mysql(){
$servername = "localhost:3306";
$username = "username";
$password = "password";
$dbname = "mxms";
// 创建连接
$conn = new mysqli($servername, $username, $password, $dbname);
// 检测连接
if ($conn->connect_error) {
    die("连接失败: " . $conn->connect_error);
}
return $conn;
}
$mysql = link_mysql();

//=================================添加数据
function add_text($a,$b,$c,$conn){
$sql = "INSERT INTO MyGuests(firstname, lastname, email)VALUES ('".$a."', '".$b."', '".$c."')";
if ($conn->query($sql) === TRUE) {
    echo "新记录插入成功";
} else {
    echo "Error: " . $sql . "<br>" . $conn->error;
}
$conn->close();
}
//add_text("漫小猫","2535080855","manxiaomao@qq.com",$mysql);

//=================================删除数据
function delete_text($conn){
mysqli_query($conn,"DELETE FROM MyGuests WHERE firstname='John'");
mysqli_close($conn);
}
//delete_text($mysql);

//=================================修改数据
function update_text($conn){
mysqli_query($conn,"UPDATE MyGuests SET email='2535080855@qq.com'
WHERE firstname='漫小猫' AND lastname='2535080855'");
mysqli_close($conn);
}
//update_text($mysql);

//=================================查询数据
function select_text($conn){
$sql = "SELECT firstname,lastname,email FROM MyGuests";
$result = $conn->query($sql);
if ($result->num_rows > 0) {
// 输出数据
while($row = $result->fetch_assoc()) {
    echo "Name: " . $row["firstname"]. " " . $row["lastname"]. "email: " . $row["email"]. "</br>";
}

} else {
    echo "查询结果为空";
}
$conn->close();
}
//select_text($mysql);

?>