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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\DatabaseDriver;
use Joomla\Database\DatabaseEvents;
use Joomla\Database\Event\ConnectionEvent;
use Joomla\Database\Exception\ConnectionFailureException;
use Joomla\Database\Exception\ExecutionFailureException;
use Joomla\Database\Exception\PrepareStatementFailureException;
use Joomla\Database\Exception\UnsupportedAdapterException;
use Joomla\Database\StatementInterface;
/**
* SQL Server Database Driver
*
* @link https://www.php.net/manual/en/book.sqlsrv.php
* @since 1.0
*/
class SqlsrvDriver extends DatabaseDriver
{
/**
* The name of the database driver.
*
* @var string
* @since 1.0
*/
public $name = 'sqlsrv';
/**
* The character(s) used to quote SQL statement names such as table names or field names, etc.
*
* If a single character string the same character is used for both sides of the quoted name, else the first character will be used for the
* opening quote and the second for the closing quote.
*
* @var string
* @since 1.0
*/
protected $nameQuote = '[]';
/**
* The null or zero representation of a timestamp for the database driver.
*
* @var string
* @since 1.0
*/
protected $nullDate = '1900-01-01 00:00:00';
/**
* The minimum supported database version.
*
* @var string
* @since 1.0
*/
protected static $dbMinimum = '11.0.2100.60';
/**
* Test to see if the SQLSRV connector is available.
*
* @return boolean True on success, false otherwise.
*
* @since 1.0
*/
public static function isSupported()
{
return \function_exists('sqlsrv_connect');
}
/**
* Constructor.
*
* @param array $options List of options used to configure the connection
*
* @since 1.0
*/
public function __construct(array $options)
{
// Get some basic values from the options.
$options['host'] = $options['host'] ?? 'localhost';
$options['user'] = $options['user'] ?? '';
$options['password'] = $options['password'] ?? '';
$options['database'] = $options['database'] ?? '';
$options['select'] = isset($options['select']) ? (bool) $options['select'] : true;
// Finalize initialisation
parent::__construct($options);
}
/**
* Connects to the database if needed.
*
* @return void Returns void if the database connected successfully.
*
* @since 1.0
* @throws \RuntimeException
*/
public function connect()
{
if ($this->connection)
{
return;
}
// Make sure the SQLSRV extension for PHP is installed and enabled.
if (!static::isSupported())
{
throw new UnsupportedAdapterException('PHP extension sqlsrv_connect is not available.');
}
// Build the connection configuration array.
$config = [
'Database' => $this->options['database'],
'uid' => $this->options['user'],
'pwd' => $this->options['password'],
'CharacterSet' => 'UTF-8',
'ReturnDatesAsStrings' => true,
];
// Attempt to connect to the server.
if (!($this->connection = @ sqlsrv_connect($this->options['host'], $config)))
{
throw new ConnectionFailureException('Could not connect to SQL Server');
}
// Make sure that DB warnings are not returned as errors.
sqlsrv_configure('WarningsReturnAsErrors', 0);
// If auto-select is enabled select the given database.
if ($this->options['select'] && !empty($this->options['database']))
{
$this->select($this->options['database']);
}
$this->dispatchEvent(new ConnectionEvent(DatabaseEvents::POST_CONNECT, $this));
}
/**
* Disconnects the database.
*
* @return void
*
* @since 1.0
*/
public function disconnect()
{
// Close the connection.
if (\is_resource($this->connection))
{
sqlsrv_close($this->connection);
}
parent::disconnect();
}
/**
* Get table constraints
*
* @param string $tableName The name of the database table.
*
* @return array Any constraints available for the table.
*
* @since 1.0
*/
protected function getTableConstraints($tableName)
{
$this->connect();
return $this->setQuery('SELECT CONSTRAINT_NAME FROM INFORMATION_SCHEMA.TABLE_CONSTRAINTS WHERE TABLE_NAME = ' . $this->quote($tableName))
->loadColumn();
}
/**
* Rename constraints.
*
* @param array $constraints Array(strings) of table constraints
* @param string $prefix A string
* @param string $backup A string
*
* @return void
*
* @since 1.0
*/
protected function renameConstraints($constraints = [], $prefix = null, $backup = null)
{
$this->connect();
foreach ($constraints as $constraint)
{
$this->setQuery('sp_rename ' . $constraint . ',' . str_replace($prefix, $backup, $constraint))
->execute();
}
}
/**
* Method to escape a string for usage in an SQL statement.
*
* The escaping for MSSQL isn't handled in the driver though that would be nice. Because of this we need to handle the escaping ourselves.
*
* @param string $text The string to be escaped.
* @param boolean $extra Optional parameter to provide extra escaping.
*
* @return string The escaped string.
*
* @since 1.0
*/
public function escape($text, $extra = false)
{
if (\is_int($text))
{
return $text;
}
if (\is_float($text))
{
// Force the dot as a decimal point.
return str_replace(',', '.', $text);
}
$result = str_replace("'", "''", $text);
// SQL Server does not accept NULL byte in query string
$result = str_replace("\0", "' + CHAR(0) + N'", $result);
// Fix for SQL Sever escape sequence, see https://support.microsoft.com/en-us/kb/164291
$result = str_replace(
["\\\n", "\\\r", "\\\\\r\r\n"],
["\\\\\n\n", "\\\\\r\r", "\\\\\r\n\r\n"],
$result
);
if ($extra)
{
// Escape special chars
$result = str_replace(
['[', '_', '%'],
['[[]', '[_]', '[%]'],
$result
);
}
return $result;
}
/**
* Quotes and optionally escapes a string to database requirements for use in database queries.
*
* @param mixed $text A string or an array of strings to quote.
* @param boolean $escape True (default) to escape the string, false to leave it unchanged.
*
* @return string The quoted input string.
*
* @since 1.6.0
*/
public function quote($text, $escape = true)
{
if (\is_array($text))
{
return parent::quote($text, $escape);
}
// To support unicode on MSSQL we have to add prefix N
return 'N\'' . ($escape ? $this->escape($text) : $text) . '\'';
}
/**
* Quotes a binary string to database requirements for use in database queries.
*
* @param string $data A binary string to quote.
*
* @return string The binary quoted input string.
*
* @since 1.7.0
*/
public function quoteBinary($data)
{
// ODBC syntax for hexadecimal literals
return '0x' . bin2hex($data);
}
/**
* Determines if the connection to the server is active.
*
* @return boolean True if connected to the database engine.
*
* @since 1.0
*/
public function connected()
{
// TODO: Run a blank query here
return true;
}
/**
* Drops a table from the database.
*
* @param string $table The name of the database table to drop.
* @param boolean $ifExists Optionally specify that the table must exist before it is dropped.
*
* @return $this
*
* @since 1.0
*/
public function dropTable($table, $ifExists = true)
{
$this->connect();
if ($ifExists)
{
$this->setQuery(
'IF EXISTS(SELECT TABLE_NAME FROM INFORMATION_SCHEMA.TABLES WHERE TABLE_NAME = '
. $this->quote($table) . ') DROP TABLE ' . $table
);
}
else
{
$this->setQuery('DROP TABLE ' . $table);
}
$this->execute();
return $this;
}
/**
* Method to get the database collation in use by sampling a text field of a table in the database.
*
* @return string|boolean The collation in use by the database or boolean false if not supported.
*
* @since 1.0
*/
public function getCollation()
{
// TODO: Not fake this
return 'MSSQL UTF-8 (UCS2)';
}
/**
* Method to get the database connection collation in use by sampling a text field of a table in the database.
*
* @return string|boolean The collation in use by the database connection (string) or boolean false if not supported.
*
* @since 1.6.0
* @throws \RuntimeException
*/
public function getConnectionCollation()
{
// TODO: Not fake this
return 'MSSQL UTF-8 (UCS2)';
}
/**
* Method to get the database encryption details (cipher and protocol) in use.
*
* @return string The database encryption details.
*
* @since 2.0.0
* @throws \RuntimeException
*/
public function getConnectionEncryption(): string
{
// TODO: Not fake this
return '';
}
/**
* Method to test if the database TLS connections encryption are supported.
*
* @return boolean Whether the database supports TLS connections encryption.
*
* @since 2.0.0
*/
public function isConnectionEncryptionSupported(): bool
{
// TODO: Not fake this
return false;
}
/**
* Retrieves field information about the given tables.
*
* @param mixed $table A table name
* @param boolean $typeOnly True to only return field types.
*
* @return array An array of fields.
*
* @since 1.0
* @throws \RuntimeException
*/
public function getTableColumns($table, $typeOnly = true)
{
$result = [];
$table_temp = $this->replacePrefix((string) $table);
// Set the query to get the table fields statement.
$this->setQuery(
'SELECT column_name as Field, data_type as Type, is_nullable as \'Null\', column_default as \'Default\'' .
' FROM information_schema.columns WHERE table_name = ' . $this->quote($table_temp)
);
$fields = $this->loadObjectList();
// If we only want the type as the value add just that to the list.
if ($typeOnly)
{
foreach ($fields as $field)
{
$result[$field->Field] = preg_replace('/[(0-9)]/', '', $field->Type);
}
}
else
{
// If we want the whole field data object add that to the list.
foreach ($fields as $field)
{
$field->Default = preg_replace("/(^(\(\(|\('|\(N'|\()|(('\)|(?<!\()\)\)|\))$))/i", '', $field->Default);
$result[$field->Field] = $field;
}
}
return $result;
}
/**
* Shows the table CREATE statement that creates the given tables.
*
* This is unsupported by MSSQL.
*
* @param mixed $tables A table name or a list of table names.
*
* @return array A list of the create SQL for the tables.
*
* @since 1.0
* @throws \RuntimeException
*/
public function getTableCreate($tables)
{
$this->connect();
return '';
}
/**
* Get the details list of keys for a table.
*
* @param string $table The name of the table.
*
* @return array An array of the column specification for the table.
*
* @since 1.0
* @throws \RuntimeException
*/
public function getTableKeys($table)
{
$this->connect();
// TODO To implement.
return [];
}
/**
* Method to get an array of all tables in the database.
*
* @return array An array of all the tables in the database.
*
* @since 1.0
* @throws \RuntimeException
*/
public function getTableList()
{
$this->connect();
// Set the query to get the tables statement.
return $this->setQuery('SELECT name FROM ' . $this->getDatabase() . '.sys.Tables WHERE type = \'U\';')->loadColumn();
}
/**
* Get the version of the database connector.
*
* @return string The database connector version.
*
* @since 1.0
*/
public function getVersion()
{
$this->connect();
$version = sqlsrv_server_info($this->connection);
return $version['SQLServerVersion'];
}
/**
* Inserts a row into a table based on an object's properties.
*
* @param string $table The name of the database table to insert into.
* @param object $object A reference to an object whose public properties match the table fields.
* @param string $key The name of the primary key. If provided the object property is updated.
*
* @return boolean True on success.
*
* @since 1.0
* @throws \RuntimeException
*/
public function insertObject($table, &$object, $key = null)
{
$fields = [];
$values = [];
$tableColumns = $this->getTableColumns($table);
$statement = 'INSERT INTO ' . $this->quoteName($table) . ' (%s) VALUES (%s)';
foreach (get_object_vars($object) as $k => $v)
{
// Skip columns that don't exist in the table.
if (!\array_key_exists($k, $tableColumns))
{
continue;
}
// Only process non-null scalars.
if (\is_array($v) || \is_object($v) || $v === null)
{
continue;
}
if (!$this->checkFieldExists($table, $k))
{
continue;
}
if ($k[0] === '_')
{
// Internal field
continue;
}
if ($k === $key && $key == 0)
{
continue;
}
$fields[] = $this->quoteName($k);
$values[] = $this->quote($v);
}
// Set the query and execute the insert.
$this->setQuery(sprintf($statement, implode(',', $fields), implode(',', $values)))->execute();
$id = $this->insertid();
if ($key && $id)
{
$object->$key = $id;
}
return true;
}
/**
* Method to get the auto-incremented value from the last INSERT statement.
*
* @return integer The value of the auto-increment field from the last inserted row.
*
* @since 1.0
*/
public function insertid()
{
$this->connect();
// TODO: SELECT IDENTITY
$this->setQuery('SELECT @@IDENTITY');
return (int) $this->loadResult();
}
/**
* Execute the SQL statement.
*
* @return boolean
*
* @since 1.0
* @throws \RuntimeException
*/
public function execute()
{
$this->connect();
// Take a local copy so that we don't modify the original query and cause issues later
$sql = $this->replacePrefix((string) $this->sql);
// Increment the query counter.
$this->count++;
// Get list of bounded parameters
$bounded =& $this->sql->getBounded();
// If there is a monitor registered, let it know we are starting this query
if ($this->monitor)
{
$this->monitor->startQuery($sql, $bounded);
}
// Execute the query.
$this->executed = false;
// Bind the variables
foreach ($bounded as $key => $obj)
{
$this->statement->bindParam($key, $obj->value, $obj->dataType);
}
try
{
$this->executed = $this->statement->execute();
// If there is a monitor registered, let it know we have finished this query
if ($this->monitor)
{
$this->monitor->stopQuery();
}
return true;
}
catch (ExecutionFailureException $exception)
{
// If there is a monitor registered, let it know we have finished this query
if ($this->monitor)
{
$this->monitor->stopQuery();
}
// Check if the server was disconnected.
if (!$this->connected())
{
try
{
// Attempt to reconnect.
$this->connection = null;
$this->connect();
}
catch (ConnectionFailureException $e)
{
// If connect fails, ignore that exception and throw the normal exception.
throw $exception;
}
// Since we were able to reconnect, run the query again.
return $this->execute();
}
// Throw the normal query exception.
throw $exception;
}
}
/**
* This function replaces a string identifier with the configured table prefix.
*
* @param string $sql The SQL statement to prepare.
* @param string $prefix The table prefix.
*
* @return string The processed SQL statement.
*
* @since 1.0
*/
public function replacePrefix($sql, $prefix = '#__')
{
$escaped = false;
$startPos = 0;
$quoteChar = '';
$literal = '';
$sql = trim($sql);
$n = \strlen($sql);
while ($startPos < $n)
{
$ip = strpos($sql, $prefix, $startPos);
if ($ip === false)
{
break;
}
$j = strpos($sql, "N'", $startPos);
$k = strpos($sql, '"', $startPos);
if (($k !== false) && (($k < $j) || ($j === false)))
{
$quoteChar = '"';
$j = $k;
}
else
{
$quoteChar = "'";
}
if ($j === false)
{
$j = $n;
}
$literal .= str_replace($prefix, $this->tablePrefix, substr($sql, $startPos, $j - $startPos));
$startPos = $j;
$j = $startPos + 1;
if ($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);
}
return $literal;
}
/**
* Select a database for use.
*
* @param string $database The name of the database to select for use.
*
* @return boolean True if the database was successfully selected.
*
* @since 1.0
* @throws ConnectionFailureException
*/
public function select($database)
{
$this->connect();
if (!$database)
{
return false;
}
if (!sqlsrv_query($this->connection, 'USE [' . $database . ']', null, ['scrollable' => \SQLSRV_CURSOR_STATIC]))
{
throw new ConnectionFailureException('Could not connect to database');
}
return true;
}
/**
* Set the connection to use UTF-8 character encoding.
*
* @return boolean True on success.
*
* @since 1.0
*/
public function setUtf()
{
return true;
}
/**
* Method to commit a transaction.
*
* @param boolean $toSavepoint If true, commit to the last savepoint.
*
* @return void
*
* @since 1.0
* @throws \RuntimeException
*/
public function transactionCommit($toSavepoint = false)
{
$this->connect();
if (!$toSavepoint || $this->transactionDepth <= 1)
{
$this->setQuery('COMMIT TRANSACTION')->execute();
$this->transactionDepth = 0;
return;
}
$this->transactionDepth--;
}
/**
* Method to roll back a transaction.
*
* @param boolean $toSavepoint If true, rollback to the last savepoint.
*
* @return void
*
* @since 1.0
* @throws \RuntimeException
*/
public function transactionRollback($toSavepoint = false)
{
$this->connect();
if (!$toSavepoint || $this->transactionDepth <= 1)
{
$this->setQuery('ROLLBACK TRANSACTION')->execute();
$this->transactionDepth = 0;
return;
}
$savepoint = 'SP_' . ($this->transactionDepth - 1);
$this->setQuery('ROLLBACK TRANSACTION ' . $this->quoteName($savepoint))->execute();
$this->transactionDepth--;
}
/**
* Method to initialize a transaction.
*
* @param boolean $asSavepoint If true and a transaction is already active, a savepoint will be created.
*
* @return void
*
* @since 1.0
* @throws \RuntimeException
*/
public function transactionStart($asSavepoint = false)
{
$this->connect();
if (!$asSavepoint || !$this->transactionDepth)
{
$this->setQuery('BEGIN TRANSACTION')->execute();
$this->transactionDepth = 1;
return;
}
$savepoint = 'SP_' . $this->transactionDepth;
$this->setQuery('BEGIN TRANSACTION ' . $this->quoteName($savepoint))->execute();
$this->transactionDepth++;
}
/**
* Method to check and see if a field exists in a table.
*
* @param string $table The table in which to verify the field.
* @param string $field The field to verify.
*
* @return boolean True if the field exists in the table.
*
* @since 1.0
*/
protected function checkFieldExists($table, $field)
{
$this->connect();
$table = $this->replacePrefix((string) $table);
$this->setQuery(
"SELECT COLUMN_NAME FROM INFORMATION_SCHEMA.COLUMNS WHERE TABLE_NAME = '$table' AND COLUMN_NAME = '$field' ORDER BY ORDINAL_POSITION"
);
return (bool) $this->loadResult();
}
/**
* Prepares a SQL statement for execution
*
* @param string $query The SQL query to be prepared.
*
* @return StatementInterface
*
* @since 2.0.0
* @throws PrepareStatementFailureException
*/
protected function prepareStatement(string $query): StatementInterface
{
return new SqlsrvStatement($this->connection, $query);
}
/**
* Renames a table in the database.
*
* @param string $oldTable The name of the table to be renamed
* @param string $newTable The new name for the table.
* @param string $backup Table prefix
* @param string $prefix For the table - used to rename constraints in non-mysql databases
*
* @return $this
*
* @since 1.0
* @throws \RuntimeException
*/
public function renameTable($oldTable, $newTable, $backup = null, $prefix = null)
{
$constraints = [];
if ($prefix !== null && $backup !== null)
{
$constraints = $this->getTableConstraints($oldTable);
}
if (!empty($constraints))
{
$this->renameConstraints($constraints, $prefix, $backup);
}
$this->setQuery("sp_rename '" . $oldTable . "', '" . $newTable . "'");
$this->execute();
return $this;
}
/**
* Locks a table in the database.
*
* @param string $tableName The name of the table to lock.
*
* @return $this
*
* @since 1.0
* @throws \RuntimeException
*/
public function lockTable($tableName)
{
return $this;
}
/**
* Unlocks tables in the database.
*
* @return $this
*
* @since 1.0
* @throws \RuntimeException
*/
public function unlockTables()
{
return $this;
}
}