根据php中某些列在mysql数据库中插入随机数

<?php
// 数据库连接信息
$servername = "localhost";
$username = "username";
$password = "password";
$dbname = "myDB";

// 创建连接
$conn = new mysqli($servername, $username, $password, $dbname);

// 检查连接
if ($conn->connect_error) {
    die("连接失败: " . $conn->connect_error);
}

// 插入随机整数到指定列
$sql = "INSERT INTO myTable (random_int_column) VALUES (" . mt_rand(1, 100) . ")";

if ($conn->query($sql) === TRUE) {
    echo "新记录插入成功";
} else {
    echo "Error: " . $sql . "<br>" . $conn->error;
}

// 插入随机浮点数到指定列
$sql = "INSERT INTO myTable (random_float_column) VALUES (" . number_format(mt_rand() / mt_getrandmax(), 2, '.', '') . ")";

if ($conn->query($sql) === TRUE) {
    echo "新记录插入成功";
} else {
    echo "Error: " . $sql . "<br>" . $conn->error;
}

// 插入随机字符串到指定列
$characters = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ';
$randomString = '';
for ($i = 0; $i < 10; $i++) {
    $randomString .= $characters[mt_rand(0, strlen($characters) - 1)];
}
$sql = "INSERT INTO myTable (random_string_column) VALUES ('$randomString')";

if ($conn->query($sql) === TRUE) {
    echo "新记录插入成功";
} else {
    echo "Error: " . $sql . "<br>" . $conn->error;
}

$conn->close();
?>