maintenance/Sqlite.php

   1 <?php
   2 /**
   3  * Helper class for sqlite-specific scripts
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along
  16  * with this program; if not, write to the Free Software Foundation, Inc.,
  17  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  18  * http://www.gnu.org/copyleft/gpl.html
  19  *
  20  * @file
  21  * @ingroup Maintenance
  22  */
  23
  24 use Wikimedia\Rdbms\DatabaseSqlite;
  25 use Wikimedia\Rdbms\DBError;
  26
  27 /**
  28  * This class contains code common to different SQLite-related maintenance scripts
  29  *
  30  * @ingroup Maintenance
  31  */
  32 class Sqlite {
  33
  34         /**
  35          * Checks whether PHP has SQLite support
  36          * @return bool
  37          */
  38         public static function isPresent() {
  39                 return extension_loaded( 'pdo_sqlite' );
  40         }
  41
  42         /**
  43          * Checks given files for correctness of SQL syntax. MySQL DDL will be converted to
  44          * SQLite-compatible during processing.
  45          * Will throw exceptions on SQL errors
  46          * @param array|string $files
  47          * @throws MWException
  48          * @return true|string True if no error or error string in case of errors
  49          */
  50         public static function checkSqlSyntax( $files ) {
  51                 if ( !self::isPresent() ) {
  52                         throw new MWException( "Can't check SQL syntax: SQLite not found" );
  53                 }
  54                 if ( !is_array( $files ) ) {
  55                         $files = [ $files ];
  56                 }
  57
  58                 $allowedTypes = array_fill_keys( [
  59                         'integer',
  60                         'real',
  61                         'text',
  62                         'blob',
  63                         // NULL type is omitted intentionally
  64                 ], true );
  65
  66                 $db = DatabaseSqlite::newStandaloneInstance( ':memory:' );
  67                 try {
  68                         foreach ( $files as $file ) {
  69                                 $err = $db->sourceFile( $file );
  70                                 if ( $err ) {
  71                                         return $err;
  72                                 }
  73                         }
  74
  75                         $tables = $db->query( "SELECT name FROM sqlite_master WHERE type='table'", __METHOD__ );
  76                         foreach ( $tables as $table ) {
  77                                 if ( strpos( $table->name, 'sqlite_' ) === 0 ) {
  78                                         continue;
  79                                 }
  80
  81                                 $columns = $db->query(
  82                                         'PRAGMA table_info(' . $db->addIdentifierQuotes( $table->name ) . ')',
  83                                         __METHOD__
  84                                 );
  85                                 foreach ( $columns as $col ) {
  86                                         if ( !isset( $allowedTypes[strtolower( $col->type )] ) ) {
  87                                                 $db->close( __METHOD__ );
  88
  89                                                 return "Table {$table->name} has column {$col->name} with non-native type '{$col->type}'";
  90                                         }
  91                                 }
  92                         }
  93                 } catch ( DBError $e ) {
  94                         return $e->getMessage();
  95                 }
  96                 $db->close( __METHOD__ );
  97
  98                 return true;
  99         }
 100 }