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<?php
/**
* Part of the Joomla Framework Database Package
*
* @copyright Copyright (C) 2005 - 2021 Open Source Matters, Inc. All rights reserved.
* @license GNU General Public License version 2 or later; see LICENSE
*/
namespace Joomla\Database\Sqlsrv;
use Joomla\Database\Exception\ExecutionFailureException;
use Joomla\Database\Exception\PrepareStatementFailureException;
use Joomla\Database\FetchMode;
use Joomla\Database\FetchOrientation;
use Joomla\Database\ParameterType;
use Joomla\Database\StatementInterface;
/**
* SQL Server Database Statement.
*
* This class is modeled on \Doctrine\DBAL\Driver\SQLSrv\SQLSrvStatement
*
* @since 2.0.0
*/
class SqlsrvStatement implements StatementInterface
{
/**
* The database connection resource.
*
* @var resource
* @since 2.0.0
*/
protected $connection;
/**
* The default fetch mode for the statement.
*
* @var integer
* @since 2.0.0
*/
protected $defaultFetchStyle = FetchMode::MIXED;
/**
* The default class to use for building object result sets.
*
* @var integer
* @since 2.0.0
*/
protected $defaultObjectClass = \stdClass::class;
/**
* Mapping array converting fetch modes to the native engine type.
*
* @var array
* @since 2.0.0
*/
private $fetchMap = [
FetchMode::MIXED => SQLSRV_FETCH_BOTH,
FetchMode::ASSOCIATIVE => SQLSRV_FETCH_ASSOC,
FetchMode::NUMERIC => SQLSRV_FETCH_NUMERIC,
];
/**
* The query string being prepared.
*
* @var string
* @since 2.0.0
*/
protected $query;
/**
* Internal tracking flag to set whether there is a result set available for processing
*
* @var boolean
* @since 2.0.0
*/
private $result = false;
/**
* The prepared statement.
*
* @var resource
* @since 2.0.0
*/
protected $statement;
/**
* Bound parameter types.
*
* @var array
* @since 2.0.0
*/
protected $typesKeyMapping;
/**
* References to the variables bound as statement parameters.
*
* @var array
* @since 2.0.0
*/
private $bindedValues = [];
/**
* Mapping between named parameters and position in query.
*
* @var array
* @since 2.0.0
*/
protected $parameterKeyMapping;
/**
* Mapping array for parameter types.
*
* @var array
* @since 2.0.0
*/
protected $parameterTypeMapping = [
ParameterType::BOOLEAN => ParameterType::BOOLEAN,
ParameterType::INTEGER => ParameterType::INTEGER,
ParameterType::LARGE_OBJECT => ParameterType::LARGE_OBJECT,
ParameterType::NULL => ParameterType::NULL,
ParameterType::STRING => ParameterType::STRING,
];
/**
* Constructor.
*
* @param resource $connection The database connection resource
* @param string $query The query this statement will process
*
* @since 2.0.0
* @throws PrepareStatementFailureException
*/
public function __construct($connection, string $query)
{
// Initial parameter types for prepared statements
$this->parameterTypeMapping = [
ParameterType::BOOLEAN => SQLSRV_PHPTYPE_INT,
ParameterType::INTEGER => SQLSRV_PHPTYPE_INT,
ParameterType::LARGE_OBJECT => SQLSRV_PHPTYPE_STREAM(SQLSRV_ENC_BINARY),
ParameterType::NULL => SQLSRV_PHPTYPE_NULL,
ParameterType::STRING => SQLSRV_PHPTYPE_STRING(SQLSRV_ENC_CHAR),
];
$this->connection = $connection;
$this->query = $this->prepareParameterKeyMapping($query);
}
/**
* Replace named parameters with numbered parameters
*
* @param string $sql The SQL statement to prepare.
*
* @return string The processed SQL statement.
*
* @since 2.0.0
*/
public function prepareParameterKeyMapping($sql)
{
$escaped = false;
$startPos = 0;
$quoteChar = '';
$literal = '';
$mapping = [];
$replace = [];
$matches = [];
$pattern = '/([:][a-zA-Z0-9_]+)/';
if (!preg_match($pattern, $sql, $matches))
{
return $sql;
}
$sql = trim($sql);
$n = \strlen($sql);
while ($startPos < $n)
{
if (!preg_match($pattern, $sql, $matches, 0, $startPos))
{
break;
}
$j = strpos($sql, "'", $startPos);
$k = strpos($sql, '"', $startPos);
if (($k !== false) && (($k < $j) || ($j === false)))
{
$quoteChar = '"';
$j = $k;
}
else
{
$quoteChar = "'";
}
if ($j === false)
{
$j = $n;
}
// Search for named prepared parameters and replace it with ? and save its position
$substring = substr($sql, $startPos, $j - $startPos);
if (preg_match_all($pattern, $substring, $matches, PREG_PATTERN_ORDER + PREG_OFFSET_CAPTURE))
{
foreach ($matches[0] as $i => $match)
{
if ($i === 0)
{
$literal .= substr($substring, 0, $match[1]);
}
$mapping[$match[0]] = \count($mapping);
$endOfPlaceholder = $match[1] + strlen($match[0]);
$beginOfNextPlaceholder = $matches[0][$i + 1][1] ?? strlen($substring);
$beginOfNextPlaceholder -= $endOfPlaceholder;
$literal .= '?' . substr($substring, $endOfPlaceholder, $beginOfNextPlaceholder);
}
}
else
{
$literal .= $substring;
}
$startPos = $j;
$j++;
if ($j >= $n)
{
break;
}
// Quote comes first, find end of quote
while (true)
{
$k = strpos($sql, $quoteChar, $j);
$escaped = false;
if ($k === false)
{
break;
}
$l = $k - 1;
while ($l >= 0 && $sql[$l] === '\\')
{
$l--;
$escaped = !$escaped;
}
if ($escaped)
{
$j = $k + 1;
continue;
}
break;
}
if ($k === false)
{
// Error in the query - no end quote; ignore it
break;
}
$literal .= substr($sql, $startPos, $k - $startPos + 1);
$startPos = $k + 1;
}
if ($startPos < $n)
{
$literal .= substr($sql, $startPos, $n - $startPos);
}
$this->parameterKeyMapping = $mapping;
return $literal;
}
/**
* Binds a parameter to the specified variable name.
*
* @param string|integer $parameter Parameter identifier. For a prepared statement using named placeholders, this will be a parameter
* name of the form `:name`. For a prepared statement using question mark placeholders, this will be
* the 1-indexed position of the parameter.
* @param mixed $variable Name of the PHP variable to bind to the SQL statement parameter.
* @param string $dataType Constant corresponding to a SQL datatype, this should be the processed type from the QueryInterface.
* @param integer $length The length of the variable. Usually required for OUTPUT parameters.
* @param array $driverOptions Optional driver options to be used.
*
* @return boolean
*
* @since 2.0.0
*/
public function bindParam($parameter, &$variable, string $dataType = ParameterType::STRING, ?int $length = null, ?array $driverOptions = null)
{
$this->bindedValues[$parameter] =& $variable;
// Validate parameter type
if (!isset($this->parameterTypeMapping[$dataType]))
{
throw new \InvalidArgumentException(sprintf('Unsupported parameter type `%s`', $dataType));
}
$this->typesKeyMapping[$parameter] = $this->parameterTypeMapping[$dataType];
$this->statement = null;
return true;
}
/**
* Binds a value to the specified variable.
*
* @param string|integer $parameter Parameter identifier. For a prepared statement using named placeholders, this will be a parameter
* name of the form `:name`. For a prepared statement using question mark placeholders, this will be
* the 1-indexed position of the parameter.
* @param mixed $variable Name of the PHP variable to bind to the SQL statement parameter.
* @param string $dataType Constant corresponding to a SQL datatype, this should be the processed type from the QueryInterface.
*
* @return void
*
* @since 2.0.0
*/
private function bindValue($parameter, $variable, $dataType = ParameterType::STRING)
{
$this->bindedValues[$parameter] = $variable;
$this->typesKeyMapping[$parameter] = $dataType;
}
/**
* Closes the cursor, enabling the statement to be executed again.
*
* @return void
*
* @since 2.0.0
*/
public function closeCursor(): void
{
if (!$this->result || !\is_resource($this->statement))
{
return;
}
// Emulate freeing the result fetching and discarding rows, similarly to what PDO does in this case
while (sqlsrv_fetch($this->statement))
{
// Do nothing (see above)
}
$this->result = false;
}
/**
* Fetches the SQLSTATE associated with the last operation on the statement handle.
*
* @return string
*
* @since 2.0.0
*/
public function errorCode()
{
$errors = sqlsrv_errors(SQLSRV_ERR_ERRORS);
if ($errors)
{
return $errors[0]['code'];
}
return false;
}
/**
* Fetches extended error information associated with the last operation on the statement handle.
*
* @return array
*
* @since 2.0.0
*/
public function errorInfo()
{
return sqlsrv_errors(SQLSRV_ERR_ERRORS);
}
/**
* Executes a prepared statement
*
* @param array|null $parameters An array of values with as many elements as there are bound parameters in the SQL statement being executed.
*
* @return boolean
*
* @since 2.0.0
*/
public function execute(?array $parameters = null)
{
if (empty($this->bindedValues) && $parameters !== null)
{
$hasZeroIndex = array_key_exists(0, $parameters);
foreach ($parameters as $key => $val)
{
$key = ($hasZeroIndex && is_numeric($key)) ? $key + 1 : $key;
$this->bindValue($key, $val);
}
}
if (!$this->statement)
{
$this->statement = $this->prepare();
}
if (!sqlsrv_execute($this->statement))
{
$errors = $this->errorInfo();
throw new ExecutionFailureException($this->query, $errors[0]['message'], $errors[0]['code']);
}
$this->result = true;
return true;
}
/**
* Fetches the next row from a result set
*
* @param integer|null $fetchStyle Controls how the next row will be returned to the caller. This value must be one of the
* FetchMode constants, defaulting to value of FetchMode::MIXED.
* @param integer $cursorOrientation For a StatementInterface object representing a scrollable cursor, this value determines which row
* will be returned to the caller. This value must be one of the FetchOrientation constants,
* defaulting to FetchOrientation::NEXT.
* @param integer $cursorOffset For a StatementInterface object representing a scrollable cursor for which the cursorOrientation
* parameter is set to FetchOrientation::ABS, this value specifies the absolute number of the row in
* the result set that shall be fetched. For a StatementInterface object representing a scrollable
* cursor for which the cursorOrientation parameter is set to FetchOrientation::REL, this value
* specifies the row to fetch relative to the cursor position before `fetch()` was called.
*
* @return mixed The return value of this function on success depends on the fetch type. In all cases, boolean false is returned on failure.
*
* @since 2.0.0
*/
public function fetch(?int $fetchStyle = null, int $cursorOrientation = FetchOrientation::NEXT, int $cursorOffset = 0)
{
if (!$this->result)
{
return false;
}
$fetchStyle = $fetchStyle ?: $this->defaultFetchStyle;
if ($fetchStyle === FetchMode::COLUMN)
{
return $this->fetchColumn();
}
if (isset($this->fetchMap[$fetchStyle]))
{
return sqlsrv_fetch_array($this->statement, $this->fetchMap[$fetchStyle]) ?: false;
}
if (\in_array($fetchStyle, [FetchMode::STANDARD_OBJECT, FetchMode::CUSTOM_OBJECT], true))
{
return sqlsrv_fetch_object($this->statement, $this->defaultObjectClass) ?: false;
}
throw new \InvalidArgumentException("Unknown fetch type '{$fetchStyle}'");
}
/**
* Returns a single column from the next row of a result set
*
* @param integer $columnIndex 0-indexed number of the column you wish to retrieve from the row.
* If no value is supplied, the first column is retrieved.
*
* @return mixed Returns a single column from the next row of a result set or boolean false if there are no more rows.
*
* @since 2.0.0
*/
public function fetchColumn($columnIndex = 0)
{
$row = $this->fetch(FetchMode::NUMERIC);
if ($row === false)
{
return false;
}
return $row[$columnIndex] ?? null;
}
/**
* Prepares the SQL Server statement resource for execution
*
* @return resource
*
* @since 2.0.0
*/
private function prepare()
{
$params = [];
$options = [];
foreach ($this->bindedValues as $key => &$value)
{
$variable = [
&$value,
SQLSRV_PARAM_IN
];
if ($this->typesKeyMapping[$key] === $this->parameterTypeMapping[ParameterType::LARGE_OBJECT])
{
$variable[] = $this->typesKeyMapping[$key];
$variable[] = SQLSRV_SQLTYPE_VARBINARY('max');
}
if (isset($this->parameterKeyMapping[$key]))
{
$params[$this->parameterKeyMapping[$key]] = $variable;
}
else
{
$params[] = $variable;
}
}
// Cleanup referenced variable
unset($value);
// SQLSRV Function sqlsrv_num_rows requires a static or keyset cursor.
if (strncmp(strtoupper(ltrim($this->query)), 'SELECT', \strlen('SELECT')) === 0)
{
$options = ['Scrollable' => SQLSRV_CURSOR_KEYSET];
}
$statement = sqlsrv_prepare($this->connection, $this->query, $params, $options);
if (!$statement)
{
$errors = $this->errorInfo();
throw new PrepareStatementFailureException($errors[0]['message'], $errors[0]['code']);
}
return $statement;
}
/**
* Returns the number of rows affected by the last SQL statement.
*
* @return integer
*
* @since 2.0.0
*/
public function rowCount(): int
{
if (strncmp(strtoupper(ltrim($this->query)), 'SELECT', \strlen('SELECT')) === 0)
{
return sqlsrv_num_rows($this->statement);
}
return sqlsrv_rows_affected($this->statement);
}
/**
* Sets the fetch mode to use while iterating this statement.
*
* @param integer $fetchMode The fetch mode, must be one of the FetchMode constants.
* @param mixed ...$args Optional mode-specific arguments.
*
* @return void
*
* @since 2.0.0
*/
public function setFetchMode(int $fetchMode, ...$args): void
{
$this->defaultFetchStyle = $fetchMode;
if (isset($args[0]))
{
$this->defaultObjectClass = $args[0];
}
}
}