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<?php
/**
* This file is part of the Dibi, smart database abstraction layer (https://dibiphp.com)
* Copyright (c) 2005 David Grudl (https://davidgrudl.com)
*/
declare(strict_types=1);
namespace Dibi\Drivers;
use Dibi;
/**
* The driver interacting with databases via ODBC connections.
*
* Driver options:
* - dsn => driver specific DSN
* - username (or user)
* - password (or pass)
* - persistent (bool) => try to find a persistent link?
* - resource (resource) => existing connection resource
* - microseconds (bool) => use microseconds in datetime format?
*/
class OdbcDriver implements Dibi\Driver
{
use Dibi\Strict;
/** @var resource */
private $connection;
/** @var int|null Affected rows */
private $affectedRows;
/** @var bool */
private $microseconds = true;
/** @throws Dibi\NotSupportedException */
public function __construct(array $config)
{
if (!extension_loaded('odbc')) {
throw new Dibi\NotSupportedException("PHP extension 'odbc' is not loaded.");
}
if (isset($config['resource'])) {
$this->connection = $config['resource'];
} else {
// default values
$config += [
'username' => ini_get('odbc.default_user'),
'password' => ini_get('odbc.default_pw'),
'dsn' => ini_get('odbc.default_db'),
];
$this->connection = empty($config['persistent'])
? @odbc_connect($config['dsn'], $config['username'] ?? '', $config['password'] ?? '') // intentionally @
: @odbc_pconnect($config['dsn'], $config['username'] ?? '', $config['password'] ?? ''); // intentionally @
}
if (!is_resource($this->connection)) {
throw new Dibi\DriverException(odbc_errormsg() . ' ' . odbc_error());
}
if (isset($config['microseconds'])) {
$this->microseconds = (bool) $config['microseconds'];
}
}
/**
* Disconnects from a database.
*/
public function disconnect(): void
{
@odbc_close($this->connection); // @ - connection can be already disconnected
}
/**
* Executes the SQL query.
* @throws Dibi\DriverException
*/
public function query(string $sql): ?Dibi\ResultDriver
{
$this->affectedRows = null;
$res = @odbc_exec($this->connection, $sql); // intentionally @
if ($res === false) {
throw new Dibi\DriverException(odbc_errormsg($this->connection) . ' ' . odbc_error($this->connection), 0, $sql);
} elseif (is_resource($res)) {
$this->affectedRows = Dibi\Helpers::false2Null(odbc_num_rows($res));
return odbc_num_fields($res)
? $this->createResultDriver($res)
: null;
}
return null;
}
/**
* Gets the number of affected rows by the last INSERT, UPDATE or DELETE query.
*/
public function getAffectedRows(): ?int
{
return $this->affectedRows;
}
/**
* Retrieves the ID generated for an AUTO_INCREMENT column by the previous INSERT query.
*/
public function getInsertId(?string $sequence): ?int
{
throw new Dibi\NotSupportedException('ODBC does not support autoincrementing.');
}
/**
* Begins a transaction (if supported).
* @throws Dibi\DriverException
*/
public function begin(?string $savepoint = null): void
{
if (!odbc_autocommit($this->connection, PHP_VERSION_ID < 80000 ? 0 : false)) {
throw new Dibi\DriverException(odbc_errormsg($this->connection) . ' ' . odbc_error($this->connection));
}
}
/**
* Commits statements in a transaction.
* @throws Dibi\DriverException
*/
public function commit(?string $savepoint = null): void
{
if (!odbc_commit($this->connection)) {
throw new Dibi\DriverException(odbc_errormsg($this->connection) . ' ' . odbc_error($this->connection));
}
odbc_autocommit($this->connection, PHP_VERSION_ID < 80000 ? 1 : true);
}
/**
* Rollback changes in a transaction.
* @throws Dibi\DriverException
*/
public function rollback(?string $savepoint = null): void
{
if (!odbc_rollback($this->connection)) {
throw new Dibi\DriverException(odbc_errormsg($this->connection) . ' ' . odbc_error($this->connection));
}
odbc_autocommit($this->connection, PHP_VERSION_ID < 80000 ? 1 : true);
}
/**
* Is in transaction?
*/
public function inTransaction(): bool
{
return !odbc_autocommit($this->connection);
}
/**
* Returns the connection resource.
* @return resource|null
*/
public function getResource()
{
return is_resource($this->connection) ? $this->connection : null;
}
/**
* Returns the connection reflector.
*/
public function getReflector(): Dibi\Reflector
{
return new OdbcReflector($this);
}
/**
* Result set driver factory.
* @param resource $resource
*/
public function createResultDriver($resource): OdbcResult
{
return new OdbcResult($resource);
}
/********************* SQL ****************d*g**/
/**
* Encodes data for use in a SQL statement.
*/
public function escapeText(string $value): string
{
return "'" . str_replace("'", "''", $value) . "'";
}
public function escapeBinary(string $value): string
{
return "'" . str_replace("'", "''", $value) . "'";
}
public function escapeIdentifier(string $value): string
{
return '[' . str_replace(['[', ']'], ['[[', ']]'], $value) . ']';
}
public function escapeBool(bool $value): string
{
return $value ? '1' : '0';
}
public function escapeDate(\DateTimeInterface $value): string
{
return $value->format('#m/d/Y#');
}
public function escapeDateTime(\DateTimeInterface $value): string
{
return $value->format($this->microseconds ? '#m/d/Y H:i:s.u#' : '#m/d/Y H:i:s#');
}
public function escapeDateInterval(\DateInterval $value): string
{
throw new Dibi\NotImplementedException;
}
/**
* Encodes string for use in a LIKE statement.
*/
public function escapeLike(string $value, int $pos): string
{
$value = strtr($value, ["'" => "''", '%' => '[%]', '_' => '[_]', '[' => '[[]']);
return ($pos & 1 ? "'%" : "'") . $value . ($pos & 2 ? "%'" : "'");
}
/**
* Injects LIMIT/OFFSET to the SQL query.
*/
public function applyLimit(string &$sql, ?int $limit, ?int $offset): void
{
if ($offset) {
throw new Dibi\NotSupportedException('Offset is not supported by this database.');
} elseif ($limit < 0) {
throw new Dibi\NotSupportedException('Negative offset or limit.');
} elseif ($limit !== null) {
$sql = 'SELECT TOP ' . $limit . ' * FROM (' . $sql . ') t';
}
}
}
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