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<?php |
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namespace Db3v4l\Core\DatabaseManager; |
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use Db3v4l\API\Interfaces\DatabaseManager; |
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use Db3v4l\API\Interfaces\SqlExecutor\Executor; |
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use Db3v4l\Core\SqlAction\Command; |
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class SQLite extends BaseManager implements DatabaseManager |
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{ |
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/** |
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* Returns the sql 'action' used to list all available databases |
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* @return Command |
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* @todo for each database, retrieve the charset/collation |
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*/ |
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public function getListDatabasesSqlAction() |
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{ |
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$fileGlob = dirname($this->databaseConfiguration['path']) . '/*.sqlite'; |
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return new Command( |
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null, |
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function() use ($fileGlob) { |
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$out = []; |
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foreach (glob($fileGlob) as $filename) { |
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$out[] = basename($filename); |
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} |
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return $out; |
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} |
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); |
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} |
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/** |
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* Returns the sql 'action' used to create a new db and accompanying user |
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* @param string $dbName |
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* @param string $userName |
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* @param string $password |
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* @param string $charset charset/collation name |
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* @return Command |
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* @todo prevent sql injection! |
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*/ |
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public function getCreateDatabaseSqlAction($dbName, $userName, $password, $charset = null) |
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{ |
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//$collation = $this->getCollationName($charset); |
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/// @todo throw if $charset is not supported |
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/// @todo this does not support creation of the new db with a different character encoding... |
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/// see https://stackoverflow.com/questions/21348459/set-pragma-encoding-utf-16-for-main-database-in-sqlite |
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$filename = dirname($this->databaseConfiguration['path']) . '/' . $dbName . '.sqlite'; |
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return new Command( |
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"ATTACH '$filename' AS \"$dbName\";" |
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); |
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} |
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/** |
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* Returns the sql 'action' used to drop a db and associated user account |
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* @param string $dbName |
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* @param string $userName |
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* @return Command |
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* @param bool $ifExists |
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* @todo prevent sql injection! |
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*/ |
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public function getDropDatabaseSqlAction($dbName, $userName, $ifExists = false) |
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{ |
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$filename = dirname($this->databaseConfiguration['path']) . '/' . $dbName . '.sqlite'; |
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return new Command( |
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null, |
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function() use($filename, $dbName, $ifExists) { |
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if (is_file($filename)) { |
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unlink($filename); |
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} else { |
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if (!$ifExists) { |
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throw new \Exception("Can not drop database '$dbName': file not found"); |
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} |
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} |
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} |
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); |
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} |
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/** |
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* Returns the sql 'action' used to list all existing db users |
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* @return Command |
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*/ |
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public function getListUsersSqlAction() |
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{ |
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return new Command( |
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null, |
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function () { |
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// since sqlite does not support users, null seems more appropriate than an empty array... |
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return null; |
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} |
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); |
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} |
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/** |
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* @param string $userName |
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* @param bool $ifExists |
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* @return Command |
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* @todo prevent sql injection! |
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*/ |
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public function getDropUserSqlAction($userName, $ifExists = false) |
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{ |
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return new Command( |
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null, |
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function() { |
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/// @todo should we return something ? |
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} |
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); |
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} |
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/** |
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* Returns the sql 'action' used to list all available collations |
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* @return Command |
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*/ |
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public function getListCollationsSqlAction() |
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{ |
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return new Command( |
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null, |
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/// @todo list the supported utf16 variants as soon as allow using them |
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function () { |
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return []; |
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} |
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); |
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/*return [ |
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// q: are these comparable to other databases ? we probably should instead list the values for https://www.sqlite.org/pragma.html#pragma_encoding |
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'PRAGMA collation_list;', |
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function ($output, $executor) { |
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$out = []; |
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foreach(explode("\n", $output) as $line) { |
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$out[] = explode("|", $line, 2)[1]; |
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} |
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sort($out); |
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return implode("\n", $out); |
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} |
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];*/ |
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} |
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/** |
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* Returns the sql 'action' used to retrieve the db instance version info |
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* @return Command |
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*/ |
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public function getRetrieveVersionInfoSqlAction() |
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{ |
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return new Command( |
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"select sqlite_version();", |
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function ($output, $executor) { |
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/** @var Executor $executor */ |
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return $executor->resultSetToArray($output)[0]; |
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} |
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); |
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} |
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/** |
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* Transform collation name into a supported one |
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* @param null|string $charset so far only 'utf8' is supported... |
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* @return null|string |
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* @todo what shall we accept as valid input, ie. 'generic' charset names ? maybe do 2 passes: known-db-charset => generic => specific for each db ? |
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* see: https://www.iana.org/assignments/character-sets/character-sets.xhtml for IANA names |
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*/ |
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/*protected function getCollationName($charset) |
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{ |
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if ($charset == null) { |
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return null; |
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} |
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$charset = trim(strtolower($charset)); |
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167
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// accept official iana charset name, but most dbs prefer 'utf8'... |
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if ($charset == 'utf-8') { |
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$charset = 'utf8'; |
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} |
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return $charset; |
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}*/ |
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} |
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gggeek /
db-3v4l
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