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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 bool 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_flip( [
59                         'integer',
60                         'real',
61                         'text',
62                         'blob', // NULL type is omitted intentionally
63                 ] );
64
65                 $db = DatabaseSqlite::newStandaloneInstance( ':memory:' );
66                 try {
67                         foreach ( $files as $file ) {
68                                 $err = $db->sourceFile( $file );
69                                 if ( $err != true ) {
70                                         return $err;
71                                 }
72                         }
73
74                         $tables = $db->query( "SELECT name FROM sqlite_master WHERE type='table'", __METHOD__ );
75                         foreach ( $tables as $table ) {
76                                 if ( strpos( $table->name, 'sqlite_' ) === 0 ) {
77                                         continue;
78                                 }
79
80                                 $columns = $db->query( "PRAGMA table_info({$table->name})", __METHOD__ );
81                                 foreach ( $columns as $col ) {
82                                         if ( !isset( $allowedTypes[strtolower( $col->type )] ) ) {
83                                                 $db->close();
84
85                                                 return "Table {$table->name} has column {$col->name} with non-native type '{$col->type}'";
86                                         }
87                                 }
88                         }
89                 } catch ( DBError $e ) {
90                         return $e->getMessage();
91                 }
92                 $db->close();
93
94                 return true;
95         }
96 }