xref: /plugin/sqlite/helper.php (revision c5e5294cebde6d31c42a37ed48fc7a179b3728b8) 
1<?php
2/**
3 * DokuWiki Plugin sqlite (Helper Component)
4 *
5 * @license GPL 2 http://www.gnu.org/licenses/gpl-2.0.html
6 * @author  Andreas Gohr <gohr@cosmocode.de>
7 */
8
9// must be run within Dokuwiki
10if(!defined('DOKU_INC')) die();
11
12if(!defined('DOKU_LF')) define('DOKU_LF', "\n");
13if(!defined('DOKU_TAB')) define('DOKU_TAB', "\t");
14if(!defined('DOKU_PLUGIN')) define('DOKU_PLUGIN', DOKU_INC.'lib/plugins/');
15
16if(!defined('DOKU_EXT_SQLITE')) define('DOKU_EXT_SQLITE', 'sqlite');
17if(!defined('DOKU_EXT_PDO')) define('DOKU_EXT_PDO', 'pdo');
18
19require_once(DOKU_PLUGIN.'sqlite/classes/adapter.php');
20
21class helper_plugin_sqlite extends DokuWiki_Plugin {
22    var $adapter = null;
23
24    public function getInfo() {
25        return confToHash(dirname(__FILE__).'plugin.info.txt');
26    }
27
28    /**
29     * Keep separate instances for every call to keep database connections
30     */
31    public function isSingleton() {
32        return false;
33    }
34
35    /**
36     * constructor
37     */
38    public function helper_plugin_sqlite() {
39
40        if(!$this->adapter) {
41            if($this->existsPDOSqlite()) {
42                require_once(DOKU_PLUGIN.'sqlite/classes/adapter_pdosqlite.php');
43                $this->adapter = new helper_plugin_sqlite_adapter_pdosqlite();
44            }
45        }
46
47        if(!$this->adapter) {
48            if($this->existsSqlite2()) {
49                require_once(DOKU_PLUGIN.'sqlite/classes/adapter_sqlite2.php');
50                $this->adapter = new helper_plugin_sqlite_adapter_sqlite2();
51            }
52        }
53
54        if(!$this->adapter) {
55            msg('SQLite & PDO SQLite support missing in this PHP install - plugin will not work', -1);
56        }
57    }
58
59    /**
60     * check availabilty of PHPs sqlite extension (for sqlite2 support)
61     */
62    public function existsSqlite2() {
63        if(!extension_loaded('sqlite')) {
64            $prefix = (PHP_SHLIB_SUFFIX === 'dll') ? 'php_' : '';
65            if(function_exists('dl')) @dl($prefix.'sqlite.'.PHP_SHLIB_SUFFIX);
66        }
67
68        return function_exists('sqlite_open');
69    }
70
71    /**
72     * check availabilty of PHP PDO sqlite3
73     */
74    public function existsPDOSqlite() {
75        if(!extension_loaded('pdo_sqlite')) {
76            $prefix = (PHP_SHLIB_SUFFIX === 'dll') ? 'php_' : '';
77            if(function_exists('dl')) @dl($prefix.'pdo_sqlite.'.PHP_SHLIB_SUFFIX);
78        }
79
80        if(class_exists('pdo')) {
81            foreach(PDO::getAvailableDrivers() as $driver) {
82                if($driver == 'sqlite') {
83                    return true;
84                }
85            }
86        }
87        return false;
88    }
89
90    /**
91     * Initializes and opens the database
92     *
93     * Needs to be called right after loading this helper plugin
94     *
95     * @param string $dbname
96     * @param string $updatedir - Database update infos
97     * @return bool
98     */
99    public function init($dbname, $updatedir) {
100
101        $init = null; // set by initdb()
102        if(!$this->adapter OR !$this->adapter->initdb($dbname, $init)) return false;
103
104        return $this->_updatedb($init, $updatedir);
105    }
106
107    /**
108     * Return the current Database Version
109     */
110    private function _currentDBversion() {
111        $sql = "SELECT val FROM opts WHERE opt = 'dbversion';";
112        $res = $this->query($sql);
113        if(!$res) return false;
114        $row = $this->res2row($res, 0);
115        return (int) $row['val'];
116    }
117
118    /**
119     * Update the database if needed
120     *
121     * @param bool   $init      - true if this is a new database to initialize
122     * @param string $updatedir - Database update infos
123     * @return bool
124     */
125    private function _updatedb($init, $updatedir) {
126        if($init) {
127
128            $current = 0;
129        } else {
130            $current = $this->_currentDBversion();
131            if(!$current) {
132                msg("SQLite: no DB version found. '".$this->adapter->getDbname()."' DB probably broken.", -1);
133                return false;
134            }
135        }
136
137        // in case of init, add versioning table
138        if($init) {
139            if(!$this->_runupdatefile(dirname(__FILE__).'/db.sql', 0)) {
140                msg("SQLite: '".$this->adapter->getDbname()."' database upgrade failed for version ", -1);
141                return false;
142            }
143        }
144
145        $latest = (int) trim(io_readFile($updatedir.'/latest.version'));
146
147        // all up to date?
148        if($current >= $latest) return true;
149        for($i = $current + 1; $i <= $latest; $i++) {
150            $file = sprintf($updatedir.'/update%04d.sql', $i);
151            if(file_exists($file)) {
152                if(!$this->_runupdatefile($file, $i)) {
153                    msg("SQLite: '".$this->adapter->getDbname()."' database upgrade failed for version ".$i, -1);
154                    return false;
155                }
156            }
157        }
158        return true;
159    }
160
161    /**
162     * Updates the database structure using the given file to
163     * the given version.
164     */
165    private function _runupdatefile($file, $version) {
166        $sql = io_readFile($file, false);
167
168        $sql = explode(";", $sql);
169        array_unshift($sql, 'BEGIN TRANSACTION');
170        array_push($sql, "INSERT OR REPLACE INTO opts (val,opt) VALUES ($version,'dbversion')");
171        array_push($sql, "COMMIT TRANSACTION");
172
173        foreach($sql as $s) {
174            $s = preg_replace('!^\s*--.*$!m', '', $s);
175            $s = trim($s);
176            if(!$s) continue;
177
178            $res = $this->query("$s;");
179            if($res === false) {
180                if($this->adapter->getName() == DOKU_EXT_SQLITE) {
181                    sqlite_query($this->db, 'ROLLBACK TRANSACTION');
182                }
183                return false;
184            }
185        }
186
187        return ($version == $this->_currentDBversion());
188    }
189
190    /**
191     * Registers a User Defined Function for use in SQL statements
192     */
193    public function create_function($function_name, $callback, $num_args) {
194        $this->adapter->create_function($function_name, $callback, $num_args);
195    }
196
197    /**
198     * Execute a query with the given parameters.
199     *
200     * Takes care of escaping
201     *
202     * @internal param string $sql - the statement
203     * @internal param $arguments ...
204     * @return bool|\SQLiteResult
205     */
206    public function query() {
207        // get function arguments
208        $args = func_get_args();
209
210        return $this->adapter->query($args);
211    }
212
213    /**
214     * Join the given values and quote them for SQL insertion
215     */
216    public function quote_and_join($vals, $sep = ',') {
217        return $this->adapter->quote_and_join($vals, $sep);
218    }
219
220    /**
221     * Run sqlite_escape_string() on the given string and surround it
222     * with quotes
223     */
224    public function quote_string($string) {
225        return $this->adapter->quote_string($string);
226    }
227
228    /**
229     * Escape string for sql
230     */
231    public function escape_string($str) {
232        return $this->adapter->escape_string($str);
233    }
234
235    /**
236     * Returns a complete result set as array
237     */
238    public function res2arr($res, $assoc = true) {
239        return $this->adapter->res2arr($res, $assoc);
240    }
241
242    /**
243     * Return the wanted row from a given result set as
244     * associative array
245     */
246    public function res2row($res, $rownum = 0) {
247        return $this->adapter->res2row($res, $rownum);
248    }
249
250    /**
251     * Return the first value from the first row.
252     */
253    public function res2single($res) {
254        return $this->adapter->res2single($res);
255    }
256
257    /**
258     * fetch the next row as zero indexed array
259     */
260    public function res_fetch_array($res) {
261        return $this->adapter->res_fetch_array($res);
262    }
263
264    /**
265     * fetch the next row as assocative array
266     */
267    public function res_fetch_assoc($res) {
268        return $this->adapter->res_fetch_assoc($res);
269    }
270
271    /**
272     * Count the number of records in result
273     *
274     * This function is really inperformant in PDO and should be avoided!
275     */
276    public function res2count($res) {
277        return $this->adapter->res2count($res);
278    }
279
280    /**
281     * Count the number of records changed last time
282     */
283    public function countChanges($db, $res) {
284        return $this->adapter->countChanges($db, $res);
285    }
286
287}
288