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<?php

/*

* Copyright 2020 Google LLC.

*

* Licensed under the Apache License, Version 2.0 (the "License");

* you may not use this file except in compliance with the License.

* You may obtain a copy of the License at

*

* http://www.apache.org/licenses/LICENSE-2.0

*

* Unless required by applicable law or agreed to in writing, software

* distributed under the License is distributed on an "AS IS" BASIS,

* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

* See the License for the specific language governing permissions and

* limitations under the License.

*/

declare(strict_types=1);

namespace Google\Cloud\Samples\CloudSQL\SQLServer;

use PDO;

use PDOException;

use RuntimeException;

/**

* Manage votes using the Cloud SQL database.

*/

class Votes

{

/**

* @var PDO

*/

private $connection;

/**

* @param PDO $connection A connection to the database.

*/

public function __construct(PDO $connection)

{

$this->connection = $connection;

}

/**

* Creates the table if it does not yet exist.

*

* @return void

*/

public function createTableIfNotExists()

{

$existsStmt = "SELECT * FROM INFORMATION_SCHEMA.TABLES

WHERE TABLE_NAME = ?";

$stmt = $this->connection->prepare($existsStmt);

$stmt->execute(['votes']);

$row = $stmt->fetch(PDO::FETCH_ASSOC);

// If the table does not exist, create it.

if (!$row) {

$sql = "CREATE TABLE votes (

vote_id INT NOT NULL IDENTITY,

time_cast DATETIME NOT NULL,

vote_value VARCHAR(6) NOT NULL,

PRIMARY KEY (vote_id)

);";

$this->connection->exec($sql);

}

}

/**

* Returns a list of the last five votes

*

* @return array

*/

public function listVotes() : array

{

$sql = "SELECT TOP 5 vote_value, time_cast FROM votes ORDER BY time_cast DESC";

$statement = $this->connection->prepare($sql);

$statement->execute();

return $statement->fetchAll(PDO::FETCH_ASSOC);

}

/**

* Get the number of votes cast for a given value.

*

* @param string $value

* @param int

*/

public function getCountByValue(string $value) : int

{

$sql = "SELECT COUNT(vote_id) as voteCount FROM votes WHERE vote_value = ?";

$statement = $this->connection->prepare($sql);

$statement->execute([$value]);

return (int) $statement->fetch(PDO::FETCH_COLUMN);

}

/**

* Insert a new vote into the database

*

* @param string $value The value to vote for.

* @return boolean

*/

public function insertVote(string $value) : bool

{

$conn = $this->connection;

$res = false;

# [START cloud_sql_sqlserver_pdo_connection]

// Use prepared statements to guard against SQL injection.

$sql = "INSERT INTO votes (time_cast, vote_value) VALUES (GETDATE(), :voteValue)";

try {

$statement = $conn->prepare($sql);

$statement->bindParam('voteValue', $value);

$res = $statement->execute();

} catch (PDOException $e) {

throw new RuntimeException(

"Could not insert vote into database. The PDO exception was " .

$e->getMessage(),

$e->getCode(),

$e

);

}

# [END cloud_sql_sqlserver_pdo_connection]

return $res;

}

}