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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\Sqlite;
use Joomla\Database\Pdo\PdoDriver;
/**
* SQLite database driver supporting PDO based connections
*
* @link https://www.php.net/manual/en/ref.pdo-sqlite.php
* @since 1.0
*/
class SqliteDriver extends PdoDriver
{
/**
* The name of the database driver.
*
* @var string
* @since 1.0
*/
public $name = 'sqlite';
/**
* 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 = '`';
/**
* Destructor.
*
* @since 1.0
*/
public function __destruct()
{
$this->disconnect();
}
/**
* Alter database's character set.
*
* @param string $dbName The database name that will be altered
*
* @return boolean|resource
*
* @since 2.0.0
* @throws \RuntimeException
*/
public function alterDbCharacterSet($dbName)
{
return false;
}
/**
* Connects to the database if needed.
*
* @return void Returns void if the database connected successfully.
*
* @since 2.0.0
* @throws RuntimeException
*/
public function connect()
{
if ($this->connection)
{
return;
}
parent::connect();
$this->connection->sqliteCreateFunction(
'ROW_NUMBER',
function ($init = null)
{
static $rownum, $partition;
if ($init !== null)
{
$rownum = $init;
$partition = null;
return $rownum;
}
$args = \func_get_args();
array_shift($args);
$partitionBy = $args ? implode(',', $args) : null;
if ($partitionBy === null || $partitionBy === $partition)
{
$rownum++;
}
else
{
$rownum = 1;
$partition = $partitionBy;
}
return $rownum;
}
);
}
/**
* Create a new database using information from $options object.
*
* @param \stdClass $options Object used to pass user and database name to database driver. This object must have "db_name" and "db_user" set.
* @param boolean $utf True if the database supports the UTF-8 character set.
*
* @return boolean|resource
*
* @since 2.0.0
* @throws \RuntimeException
*/
public function createDatabase($options, $utf = true)
{
// SQLite doesn't have a query for this
return true;
}
/**
* Method to escape a string for usage in an SQLite statement.
*
* Note: Using query objects with bound variables is preferable to the below.
*
* @param string $text The string to be escaped.
* @param boolean $extra Unused optional parameter to provide extra escaping.
*
* @return string The escaped string.
*
* @since 1.0
*/
public function escape($text, $extra = false)
{
if (\is_int($text))
{
return $text;
}
if (\is_float($text))
{
// Force the dot as a decimal point.
return str_replace(',', '.', $text);
}
return \SQLite3::escapeString($text);
}
/**
* 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()
{
return false;
}
/**
* 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()
{
return false;
}
/**
* 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;
}
/**
* Shows the table CREATE statement that creates the given tables.
*
* Note: Doesn't appear to have support in SQLite
*
* @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();
// Sanitize input to an array and iterate over the list.
$tables = (array) $tables;
return $tables;
}
/**
* Retrieves field information about a given table.
*
* @param string $table The name of the database table.
* @param boolean $typeOnly True to only return field types.
*
* @return array An array of fields for the database table.
*
* @since 1.0
* @throws \RuntimeException
*/
public function getTableColumns($table, $typeOnly = true)
{
$this->connect();
$columns = [];
$fieldCasing = $this->getOption(\PDO::ATTR_CASE);
$this->setOption(\PDO::ATTR_CASE, \PDO::CASE_UPPER);
$table = strtoupper($table);
$fields = $this->setQuery('pragma table_info(' . $table . ')')->loadObjectList();
if ($typeOnly)
{
foreach ($fields as $field)
{
$columns[$field->NAME] = $field->TYPE;
}
}
else
{
foreach ($fields as $field)
{
// Do some dirty translation to MySQL output.
// TODO: Come up with and implement a standard across databases.
$columns[$field->NAME] = (object) [
'Field' => $field->NAME,
'Type' => $field->TYPE,
'Null' => $field->NOTNULL == '1' ? 'NO' : 'YES',
'Default' => $field->DFLT_VALUE,
'Key' => $field->PK != '0' ? 'PRI' : '',
];
}
}
$this->setOption(\PDO::ATTR_CASE, $fieldCasing);
return $columns;
}
/**
* 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();
$keys = [];
$fieldCasing = $this->getOption(\PDO::ATTR_CASE);
$this->setOption(\PDO::ATTR_CASE, \PDO::CASE_UPPER);
$table = strtoupper($table);
$rows = $this->setQuery('pragma table_info( ' . $table . ')')->loadObjectList();
foreach ($rows as $column)
{
if ($column->PK == 1)
{
$keys[$column->NAME] = $column;
}
}
$this->setOption(\PDO::ATTR_CASE, $fieldCasing);
return $keys;
}
/**
* Method to get an array of all tables in the database (schema).
*
* @return array An array of all the tables in the database.
*
* @since 1.0
* @throws \RuntimeException
*/
public function getTableList()
{
$this->connect();
$type = 'table';
$query = $this->getQuery(true)
->select('name')
->from('sqlite_master')
->where('type = :type')
->bind(':type', $type)
->order('name');
return $this->setQuery($query)->loadColumn();
}
/**
* Get the version of the database connector.
*
* @return string The database connector version.
*
* @since 1.0
*/
public function getVersion()
{
$this->connect();
return $this->setQuery('SELECT sqlite_version()')->loadResult();
}
/**
* Select a database for use.
*
* @param string $database The name of the database to select for use.
*
* @return boolean True if the database was successfully selected.
*
* @since 1.0
* @throws \RuntimeException
*/
public function select($database)
{
$this->connect();
return true;
}
/**
* Set the connection to use UTF-8 character encoding.
*
* Returns false automatically for the Oracle driver since
* you can only set the character set when the connection
* is created.
*
* @return boolean True on success.
*
* @since 1.0
*/
public function setUtf()
{
$this->connect();
return false;
}
/**
* Locks a table in the database.
*
* @param string $table The name of the table to unlock.
*
* @return $this
*
* @since 1.0
* @throws \RuntimeException
*/
public function lockTable($table)
{
return $this;
}
/**
* 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 Not used by Sqlite.
* @param string $prefix Not used by Sqlite.
*
* @return $this
*
* @since 1.0
* @throws \RuntimeException
*/
public function renameTable($oldTable, $newTable, $backup = null, $prefix = null)
{
$this->setQuery('ALTER TABLE ' . $oldTable . ' RENAME TO ' . $newTable)->execute();
return $this;
}
/**
* Method to truncate a table.
*
* @param string $table The table to truncate
*
* @return void
*
* @since 1.2.1
* @throws \RuntimeException
*/
public function truncateTable($table)
{
$this->setQuery('DELETE FROM ' . $this->quoteName($table))
->execute();
}
/**
* Unlocks tables in the database.
*
* @return $this
*
* @since 1.0
* @throws \RuntimeException
*/
public function unlockTables()
{
return $this;
}
/**
* Test to see if the PDO ODBC connector is available.
*
* @return boolean True on success, false otherwise.
*
* @since 1.0
*/
public static function isSupported()
{
return class_exists('\\PDO') && class_exists('\\SQLite3') && \in_array('sqlite', \PDO::getAvailableDrivers(), 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 || $this->transactionDepth <= 1)
{
parent::transactionCommit($toSavepoint);
}
else
{
$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 || $this->transactionDepth <= 1)
{
parent::transactionRollback($toSavepoint);
}
else
{
$savepoint = 'SP_' . ($this->transactionDepth - 1);
$this->setQuery('ROLLBACK TO ' . $this->quoteName($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 || !$this->transactionDepth)
{
parent::transactionStart($asSavepoint);
}
else
{
$savepoint = 'SP_' . $this->transactionDepth;
$this->setQuery('SAVEPOINT ' . $this->quoteName($savepoint))->execute();
$this->transactionDepth++;
}
}
}