如何在PHP中使用Oracle数据库的时间序列数据处理技巧

<?php
$host = 'localhost';
$port = '1521';
$sid = 'ORCL';
$dsn = "oci:dbname=//(DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=$host)(PORT=$port))(CONNECT_DATA=(SID=$sid)))";
$user = 'username';
$password = 'password';

try {
    $pdo = new PDO($dsn, $user, $password);
    echo "Connected to Oracle database successfully!";
} catch (PDOException $e) {
    echo "Connection failed: " . $e->getMessage();
}
?>

<?php
$sql = "CREATE TABLE time_series_data (
        id INT PRIMARY KEY,
        timestamp_col TIMESTAMP,
        value NUMBER
    )";

$pdo->exec($sql);
echo "Time series table created successfully!";
?>

<?php
$id = 1;
$timestamp = '2022-01-01 00:00:00';
$value = 10;

$sql = "INSERT INTO time_series_data (id, timestamp_col, value)
        VALUES (:id, TO_TIMESTAMP(:timestamp, 'YYYY-MM-DD HH24:MI:SS'), :value)";

$stmt = $pdo->prepare($sql);
$stmt->bindParam(':id', $id, PDO::PARAM_INT);
$stmt->bindParam(':timestamp', $timestamp, PDO::PARAM_STR);
$stmt->bindParam(':value', $value, PDO::PARAM_INT);
$stmt->execute();

echo "Time series data inserted successfully!";
?>

<?php
$startTimestamp = '2022-01-01 00:00:00';
$endTimestamp = '2022-01-02 00:00:00';

$sql = "SELECT id, TO_CHAR(timestamp_col, 'YYYY-MM-DD HH24:MI:SS') AS timestamp, value
        FROM time_series_data
        WHERE timestamp_col >= TO_TIMESTAMP(:startTimestamp, 'YYYY-MM-DD HH24:MI:SS')
        AND timestamp_col < TO_TIMESTAMP(:endTimestamp, 'YYYY-MM-DD HH24:MI:SS')";

$stmt = $pdo->prepare($sql);
$stmt->bindParam(':startTimestamp', $startTimestamp, PDO::PARAM_STR);
$stmt->bindParam(':endTimestamp', $endTimestamp, PDO::PARAM_STR);
$stmt->execute();

$result = $stmt->fetchAll(PDO::FETCH_ASSOC);
foreach ($result as $row) {
    echo "ID: " . $row['id'] . " Timestamp: " . $row['timestamp'] . " Value: " . $row['value'] . "
";
}
?>