如何在MySQL中使用PHP编写自定义存储过程、触发器和函数

<?php

$servername = "localhost";
$username = "your_username";
$passWord = "your_password";
$dbname = "your_database";

// 创建与数据库的连接
$conn = new mysqli($servername, $username, $password, $dbname);

// 检查连接是否成功
if ($conn->connect_error) {
    die("Connection failed: " . $conn->connect_error);
}

// 创建存储过程
$sql = "
    CREATE PROCEDURE getAllUsers()
    BEGIN
        SELECT * FROM users;
    END;
";

if ($conn->query($sql) === TRUE) {
    echo "存储过程创建成功";
} else {
    echo "存储过程创建失败: " . $conn->error;
}

// 关闭连接
$conn->close();

?>

<?php

$servername = "localhost";
$username = "your_username";
$password = "your_password";
$dbname = "your_database";

// 创建与数据库的连接
$conn = new mysqli($servername, $username, $password, $dbname);

// 检查连接是否成功
if ($conn->connect_error) {
    die("Connection failed: " . $conn->connect_error);
}

// 创建触发器
$sql = "
    CREATE TRIGGER updateUserCount
    AFTER INSERT ON users
    FOR EACH ROW
    BEGIN
        UPDATE statistics SET user_count = user_count + 1;
    END;
";

if ($conn->query($sql) === TRUE) {
    echo "触发器创建成功";
} else {
    echo "触发器创建失败: " . $conn->error;
}

// 关闭连接
$conn->close();

?>

<?php

$servername = "localhost";
$username = "your_username";
$password = "your_password";
$dbname = "your_database";

// 创建与数据库的连接
$conn = new mysqli($servername, $username, $password, $dbname);

// 检查连接是否成功
if ($conn->connect_error) {
    die("Connection failed: " . $conn->connect_error);
}

// 创建函数
$sql = "
    CREATE FUNCTION multiply(a INT, b INT)
    RETURNS INT
    BEGIN
        RETURN a * b;
    END;
";

if ($conn->query($sql) === TRUE) {
    echo "函数创建成功";
} else {
    echo "函数创建失败: " . $conn->error;
}

// 关闭连接
$conn->close();

?>