php判断mysql表是否存在

<?php
$servername = "localhost";
$username = "username";
$password = "password";
$dbname = "database_name";

// 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);
}

// 检查表是否存在
$table_name = "table_to_check";
$sql = "SHOW TABLES LIKE '$table_name'";
$result = $conn->query($sql);

if ($result->num_rows > 0) {
    echo "表存在";
} else {
    echo "表不存在";
}

$conn->close();
?>

<?php
$servername = "localhost";
$username = "username";
$password = "password";
$dbname = "database_name";

// 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);
}

// 检查表是否存在
$table_name = "table_to_check";
$sql = "SELECT TABLE_NAME FROM INFORMATION_SCHEMA.TABLES WHERE TABLE_SCHEMA = '$dbname' AND TABLE_NAME = '$table_name'";
$result = $conn->query($sql);

if ($result->num_rows > 0) {
    echo "表存在";
} else {
    echo "表不存在";
}

$conn->close();
?>

<?php
$servername = "localhost";
$username = "username";
$password = "password";
$dbname = "database_name";

// 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);
}

// 使用预处理语句检查表是否存在
$table_name = "table_to_check";
$stmt = $conn->prepare("SHOW TABLES LIKE ?");
$stmt->bind_param("s", $table_name);
$stmt->execute();
$result = $stmt->get_result();

if ($result->num_rows > 0) {
    echo "表存在";
} else {
    echo "表不存在";
}

$stmt->close();
$conn->close();
?>