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295 | daniel-mar | 1 | <?php |
2 | |||
3 | /* |
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4 | * OIDplus 2.0 |
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5 | * Copyright 2019 Daniel Marschall, ViaThinkSoft |
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6 | * |
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7 | * Licensed under the Apache License, Version 2.0 (the "License"); |
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8 | * you may not use this file except in compliance with the License. |
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9 | * You may obtain a copy of the License at |
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10 | * |
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11 | * http://www.apache.org/licenses/LICENSE-2.0 |
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12 | * |
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13 | * Unless required by applicable law or agreed to in writing, software |
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14 | * distributed under the License is distributed on an "AS IS" BASIS, |
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15 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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16 | * See the License for the specific language governing permissions and |
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17 | * limitations under the License. |
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18 | */ |
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19 | |||
20 | abstract class OIDplusDatabaseConnection { |
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21 | protected /*bool*/ $connected = false; |
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22 | protected /*?bool*/ $html = null; |
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23 | protected /*?string*/ $last_query = null; |
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24 | |||
348 | daniel-mar | 25 | public abstract static function getPlugin(): OIDplusDatabasePlugin; |
295 | daniel-mar | 26 | protected abstract function doQuery(string $sql, /*?array*/ $prepared_args=null): OIDplusQueryResult; |
27 | public abstract function error(): string; |
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28 | public abstract function transaction_begin()/*: void*/; |
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29 | public abstract function transaction_commit()/*: void*/; |
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30 | public abstract function transaction_rollback()/*: void*/; |
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31 | public abstract function transaction_supported(): bool; |
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32 | public abstract function transaction_level(): int; |
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33 | protected abstract function doConnect()/*: void*/; |
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34 | protected abstract function doDisconnect()/*: void*/; |
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35 | |||
36 | public function insert_id(): int { |
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37 | // This is the "fallback" variant. If your database provider (e.g. PDO) supports |
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38 | // a function to detect the last inserted id, please override this |
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39 | // function in order to use that specialized function (since it is usually |
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40 | // more reliable). |
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316 | daniel-mar | 41 | return $this->getSlang()->insert_id($this); |
295 | daniel-mar | 42 | } |
43 | |||
44 | public final function query(string $sql, /*?array*/ $prepared_args=null): OIDplusQueryResult { |
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45 | |||
46 | $query_logfile = OIDplus::baseConfig()->getValue('QUERY_LOGFILE', ''); |
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47 | if (!empty($query_logfile)) { |
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48 | $ts = explode(" ",microtime()); |
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49 | $ts = date("Y-m-d H:i:s",$ts[1]).substr((string)$ts[0],1,4); |
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50 | static $log_session_id = ""; |
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51 | if (empty($log_session_id)) { |
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52 | $log_session_id = rand(10000,99999); |
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53 | } |
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54 | $file = isset($_SERVER['REQUEST_URI']) ? ' | '.$_SERVER['REQUEST_URI'] : ''; |
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55 | file_put_contents($query_logfile, "$ts <$log_session_id$file> $sql\n", FILE_APPEND); |
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56 | } |
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57 | |||
58 | $this->last_query = $sql; |
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59 | $sql = str_replace('###', OIDplus::baseConfig()->getValue('TABLENAME_PREFIX', ''), $sql); |
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60 | return $this->doQuery($sql, $prepared_args); |
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61 | } |
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62 | |||
63 | public final function connect()/*: void*/ { |
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64 | if ($this->connected) return; |
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65 | $this->beforeConnect(); |
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66 | $this->doConnect(); |
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67 | $this->connected = true; |
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68 | register_shutdown_function(array($this, 'disconnect')); |
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318 | daniel-mar | 69 | $this->afterConnectMandatory(); |
295 | daniel-mar | 70 | $this->afterConnect(); |
71 | } |
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72 | |||
73 | public final function disconnect()/*: void*/ { |
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74 | if (!$this->connected) return; |
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75 | $this->beforeDisconnect(); |
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76 | $this->doDisconnect(); |
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77 | $this->connected = false; |
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78 | $this->afterDisconnect(); |
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79 | } |
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80 | |||
81 | public function natOrder($fieldname, $order='asc'): string { |
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325 | daniel-mar | 82 | $slang = $this->getSlang(); |
83 | if (!is_null($slang)) { |
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84 | return $slang->natOrder($fieldname, $order); |
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295 | daniel-mar | 85 | } else { |
86 | $order = strtolower($order); |
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87 | if (($order != 'asc') && ($order != 'desc')) { |
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360 | daniel-mar | 88 | throw new OIDplusException(_L('Invalid order "%1" (needs to be "asc" or "desc")',$order)); |
295 | daniel-mar | 89 | } |
90 | |||
91 | // For (yet) unsupported DBMS, we do not offer natural sort |
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92 | return "$fieldname $order"; |
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93 | } |
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94 | } |
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95 | |||
96 | protected function beforeDisconnect()/*: void*/ {} |
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97 | |||
98 | protected function afterDisconnect()/*: void*/ {} |
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99 | |||
100 | protected function beforeConnect()/*: void*/ {} |
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101 | |||
318 | daniel-mar | 102 | protected function afterConnect()/*: void*/ {} |
103 | |||
104 | private function afterConnectMandatory()/*: void*/ { |
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295 | daniel-mar | 105 | // Check if the config table exists. This is important because the database version is stored in it |
106 | $this->initRequireTables(array('config')); |
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107 | |||
108 | // Do the database tables need an update? |
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109 | // It is important that we do it immediately after connecting, |
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110 | // because the database structure might change and therefore various things might fail. |
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111 | // Note: The config setting "database_version" is inserted in setup/sql/...sql, not in the OIDplus core init |
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112 | |||
113 | $res = $this->query("SELECT value FROM ###config WHERE name = 'database_version'"); |
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114 | $row = $res->fetch_array(); |
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115 | if ($row == null) { |
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360 | daniel-mar | 116 | throw new OIDplusConfigInitializationException(_L('Cannot determine database version (the entry "database_version" inside the table "###config" is probably missing)')); |
295 | daniel-mar | 117 | } |
118 | $version = $row['value']; |
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119 | if (!is_numeric($version) || ($version < 200) || ($version > 999)) { |
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360 | daniel-mar | 120 | throw new OIDplusConfigInitializationException(_L('Entry "database_version" inside the table "###config" seems to be wrong (expect number between 200 and 999)')); |
295 | daniel-mar | 121 | } |
386 | daniel-mar | 122 | |
123 | $update_files = glob(OIDplus::basePath().'/includes/db_updates/update*.inc.php'); |
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124 | foreach ($update_files as $update_file) { |
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125 | include_once $update_file; |
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126 | } |
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127 | while (function_exists($function_name = "oidplus_dbupdate_".$version."_".($version+1))) { |
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295 | daniel-mar | 128 | $prev_version = $version; |
386 | daniel-mar | 129 | $function_name($this, $version); |
295 | daniel-mar | 130 | if ($version != $prev_version+1) { |
131 | // This should usually not happen, since the update-file should increase the version |
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132 | // or throw an Exception by itself |
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360 | daniel-mar | 133 | throw new OIDplusException(_L('Database update %1 -> %2 failed (script reports new version to be %3)',$prev_version,$prev_version+1,$version)); |
295 | daniel-mar | 134 | } |
135 | } |
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136 | |||
137 | // Now that our database is up-to-date, we check if database tables are existing |
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138 | // without config table, because it was checked above |
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139 | $this->initRequireTables(array('objects', 'asn1id', 'iri', 'ra'/*, 'config'*/)); |
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316 | daniel-mar | 140 | |
141 | // In case an auto-detection of the slang is required (for generic providers like PDO or ODBC), |
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142 | // we must not be inside a transaction, because the detection requires intentionally submitting |
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143 | // invalid queries to detect the correct DBMS. If we would be inside a transaction, providers like |
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144 | // PDO would automatically roll-back. Therefore, we detect the slang right at the beginning, |
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145 | // before any transaction is used. |
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146 | $this->getSlang(); |
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295 | daniel-mar | 147 | } |
148 | |||
149 | private function initRequireTables($tableNames)/*: void*/ { |
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150 | $msgs = array(); |
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151 | foreach ($tableNames as $tableName) { |
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152 | $prefix = OIDplus::baseConfig()->getValue('TABLENAME_PREFIX', ''); |
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153 | if (!$this->tableExists($prefix.$tableName)) { |
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360 | daniel-mar | 154 | $msgs[] = _L('Table %1 is missing!',$prefix.$tableName); |
295 | daniel-mar | 155 | } |
156 | } |
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157 | if (count($msgs) > 0) { |
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158 | throw new OIDplusConfigInitializationException(implode("\n\n",$msgs)); |
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159 | } |
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160 | } |
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161 | |||
162 | public function tableExists($tableName): bool { |
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163 | try { |
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318 | daniel-mar | 164 | // Attention: This query could interrupt transactions if Rollback-On-Error is enabled |
295 | daniel-mar | 165 | $this->query("select 0 from ".$tableName." where 1=0"); |
166 | return true; |
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167 | } catch (Exception $e) { |
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168 | return false; |
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169 | } |
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170 | } |
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171 | |||
172 | public function isConnected(): bool { |
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173 | return $this->connected; |
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174 | } |
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175 | |||
176 | public function init($html = true)/*: void*/ { |
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177 | $this->html = $html; |
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178 | } |
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179 | |||
180 | public function sqlDate(): string { |
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325 | daniel-mar | 181 | $slang = $this->getSlang(); |
182 | if (!is_null($slang)) { |
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183 | return $slang->sqlDate(); |
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295 | daniel-mar | 184 | } else { |
185 | return "'" . datetime('Y-m-d H:i:s') . "'"; |
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186 | } |
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187 | } |
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188 | |||
316 | daniel-mar | 189 | public function getSlang(bool $mustExist=true)/*: ?OIDplusSqlSlangPlugin*/ { |
326 | daniel-mar | 190 | static /*?OIDplusSqlSlangPlugin*/ $slangCache = null; |
191 | |||
192 | if (is_null($slangCache)) { |
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295 | daniel-mar | 193 | if (OIDplus::baseConfig()->exists('FORCE_DBMS_SLANG')) { |
194 | $name = OIDplus::baseConfig()->getValue('FORCE_DBMS_SLANG', ''); |
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326 | daniel-mar | 195 | $slangCache = OIDplus::getSqlSlangPlugin($name); |
196 | if ($mustExist && is_null($slangCache)) { |
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360 | daniel-mar | 197 | throw new OIDplusConfigInitializationException(_L('Enforced SQL slang (via setting FORCE_DBMS_SLANG) "%1" does not exist.',$name)); |
295 | daniel-mar | 198 | } |
199 | } else { |
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200 | foreach (OIDplus::getSqlSlangPlugins() as $plugin) { |
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316 | daniel-mar | 201 | if ($plugin->detect($this)) { |
326 | daniel-mar | 202 | $slangCache = $plugin; |
295 | daniel-mar | 203 | break; |
204 | } |
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205 | } |
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326 | daniel-mar | 206 | if ($mustExist && is_null($slangCache)) { |
360 | daniel-mar | 207 | throw new OIDplusException(_L('Cannot determine the SQL slang of your DBMS. Your DBMS is probably not supported.')); |
295 | daniel-mar | 208 | } |
209 | } |
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210 | } |
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211 | |||
326 | daniel-mar | 212 | return $slangCache; |
295 | daniel-mar | 213 | } |
360 | daniel-mar | 214 | } |