ricardosierra /
phpspider
| Total Complexity | 100 |
| Total Lines | 554 |
| Duplicated Lines | 0 % |
| Changes | 0 | ||
Complex classes like db often do a lot of different things. To break such a class down, we need to identify a cohesive component within that class. A common approach to find such a component is to look for fields/methods that share the same prefixes, or suffixes.
Once you have determined the fields that belong together, you can apply the Extract Class refactoring. If the component makes sense as a sub-class, Extract Subclass is also a candidate, and is often faster.
While breaking up the class, it is a good idea to analyze how other classes use db, and based on these observations, apply Extract Interface, too.
| 1 | <?php |
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| 18 | class db |
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| 19 | { |
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| 20 | private static $configs = array(); |
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| 21 | private static $rsid; |
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| 22 | private static $links = array(); |
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| 23 | private static $link_name = 'default'; |
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| 24 | private static $autocommiting = false; |
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| 25 | |||
| 26 | public static function _init() |
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| 67 | } |
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| 68 | } |
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| 69 | } |
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| 70 | |||
| 71 | /** |
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| 72 | * 重新设置连接 |
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| 73 | * 传空的话就等于关闭数据库再连接 |
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| 74 | * 在多进程环境下如果主进程已经调用过了，子进程一定要调用一次 clear_link，否则会报错： |
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| 75 | * Error while reading greeting packet. PID=19615，这是两个进程互抢一个连接句柄引起的 |
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| 76 | * |
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| 77 | * @param array $config |
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| 78 | * @return void |
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| 79 | * @author seatle <[email protected]> |
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| 80 | * @created time :2016-03-29 00:51 |
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| 81 | */ |
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| 82 | public static function clear_link() |
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| 83 | { |
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| 84 | if(self::$links) |
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| 85 | { |
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| 86 | foreach(self::$links as $k=>$v) |
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| 87 | { |
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| 88 | @mysqli_close($v['conn']); |
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| 89 | unset(self::$links[$k]); |
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| 90 | } |
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| 91 | } |
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| 92 | // 注意，只会连接最后一个，不过貌似也够用了啊 |
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| 93 | self::_init(); |
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| 94 | } |
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| 95 | |||
| 96 | /** |
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| 97 | * 改变链接为指定配置的链接(如果不同时使用多个数据库，不会涉及这个操作) |
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| 98 | * @parem $link_name 链接标识名 |
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| 99 | * @parem $config 多次使用时， 这个数组只需传递一次 |
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| 100 | * config 格式与 $GLOBALS['config']['db'] 一致 |
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| 101 | * @return void |
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| 102 | */ |
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| 103 | public static function set_connect($link_name, $config = array()) |
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| 115 | } |
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| 116 | } |
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| 117 | } |
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| 118 | |||
| 119 | |||
| 120 | /** |
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| 121 | * 还原为默认连接(如果不同时使用多个数据库，不会涉及这个操作) |
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| 122 | * @parem $config 指定配置（默认使用inc_config.php的配置） |
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| 123 | * @return void |
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| 124 | */ |
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| 125 | public static function set_connect_default() |
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| 126 | { |
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| 127 | $config = self::_get_default_config(); |
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| 128 | self::set_connect('default', $config); |
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| 129 | } |
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| 130 | |||
| 131 | |||
| 132 | /** |
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| 133 | * 获取默认配置 |
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| 134 | */ |
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| 135 | protected static function _get_default_config() |
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| 146 | } |
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| 147 | |||
| 148 | /** |
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| 149 | * 返回查询游标 |
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| 150 | * @return rsid |
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| 151 | */ |
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| 152 | protected static function _get_rsid($rsid = '') |
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| 153 | { |
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| 154 | return $rsid == '' ? self::$rsid : $rsid; |
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| 155 | } |
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| 156 | |||
| 157 | public static function autocommit($mode = false) |
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| 158 | { |
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| 159 | if ( self::$autocommiting ) |
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| 160 | { |
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| 161 | return true; |
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| 162 | } |
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| 163 | |||
| 164 | self::$autocommiting = true; |
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| 165 | |||
| 166 | self::_init(); |
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| 167 | return mysqli_autocommit(self::$links[self::$link_name]['conn'], $mode); |
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| 168 | } |
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| 169 | |||
| 170 | public static function begin_tran() |
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| 173 | } |
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| 174 | |||
| 175 | public static function commit() |
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| 176 | { |
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| 177 | mysqli_commit(self::$links[self::$link_name]['conn']); |
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| 178 | self::autocommit(true); |
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| 179 | return true; |
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| 180 | } |
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| 181 | |||
| 182 | |||
| 183 | public static function rollback() |
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| 184 | { |
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| 185 | mysqli_rollback(self::$links[self::$link_name]['conn']); |
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| 186 | self::autocommit(true); |
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| 187 | return true; |
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| 188 | } |
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| 189 | |||
| 190 | public static function query($sql) |
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| 242 | } |
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| 243 | } |
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| 244 | |||
| 245 | public static function fetch($rsid = '') |
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| 246 | { |
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| 247 | $rsid = self::_get_rsid($rsid); |
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| 248 | $row = mysqli_fetch_array($rsid, MYSQLI_ASSOC); |
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| 249 | return $row; |
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| 250 | } |
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| 251 | |||
| 252 | public static function get_one($sql) |
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| 253 | { |
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| 254 | if (!preg_match("/limit/i", $sql)) |
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| 255 | { |
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| 256 | $sql = preg_replace("/[,;]$/i", '', trim($sql)) . " limit 1 "; |
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| 257 | } |
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| 258 | $rsid = self::query($sql); |
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| 259 | if ($rsid === false) |
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| 260 | { |
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| 261 | return array(); |
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| 262 | } |
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| 263 | $row = self::fetch($rsid); |
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| 264 | self::free($rsid); |
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| 265 | return $row; |
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| 266 | } |
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| 267 | |||
| 268 | public static function get_all($sql) |
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| 269 | { |
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| 270 | $rsid = self::query($sql); |
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| 271 | if ($rsid === false) |
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| 272 | { |
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| 273 | return array(); |
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| 274 | } |
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| 275 | while ( $row = self::fetch($rsid) ) |
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| 276 | { |
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| 277 | $rows[] = $row; |
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| 278 | } |
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| 279 | self::free($rsid); |
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| 280 | return empty($rows) ? false : $rows; |
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| 281 | } |
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| 282 | |||
| 283 | public static function free($rsid) |
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| 284 | { |
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| 285 | return mysqli_free_result($rsid); |
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| 286 | } |
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| 287 | |||
| 288 | public static function insert_id() |
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| 291 | } |
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| 292 | |||
| 293 | public static function affected_rows() |
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| 296 | } |
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| 297 | |||
| 298 | public static function insert($table = '', $data = null, $return_sql = false) |
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| 299 | { |
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| 300 | $items_sql = $values_sql = ""; |
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| 301 | foreach ($data as $k => $v) |
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| 302 | { |
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| 303 | $v = stripslashes($v); |
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| 304 | $v = addslashes($v); |
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| 305 | $items_sql .= "`$k`,"; |
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| 306 | $values_sql .= "\"$v\","; |
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| 307 | } |
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| 308 | $sql = "Insert Ignore Into `{$table}` (" . substr($items_sql, 0, -1) . ") Values (" . substr($values_sql, 0, -1) . ")"; |
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| 309 | if ($return_sql) |
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| 310 | { |
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| 311 | return $sql; |
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| 312 | } |
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| 313 | else |
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| 314 | { |
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| 315 | if (self::query($sql)) |
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| 316 | { |
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| 317 | return mysqli_insert_id(self::$links[self::$link_name]['conn']); |
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| 318 | } |
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| 319 | else |
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| 320 | { |
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| 321 | return false; |
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| 322 | } |
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| 323 | } |
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| 324 | } |
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| 325 | |||
| 326 | public static function insert_batch($table = '', $set = NULL, $return_sql = FALSE) |
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| 365 | } |
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| 366 | |||
| 367 | public static function update_batch($table = '', $set = NULL, $index = NULL, $where = NULL, $return_sql = FALSE) |
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| 368 | { |
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| 369 | if (empty($table) || is_null($set) || is_null($index)) |
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| 370 | { |
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| 371 | // 不要用exit，会中断程序 |
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| 372 | return false; |
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| 373 | } |
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| 374 | $set = self::strsafe($set); |
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| 375 | $fields = self::get_fields($table); |
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| 376 | |||
| 377 | $ids = array(); |
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| 378 | foreach ($set as $val) |
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| 379 | { |
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| 380 | ksort($val); |
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| 381 | // 去重，其实不去也可以，因为相同的when只会执行第一个，后面的就直接跳过不执行了 |
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| 382 | $key = md5($val[$index]); |
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| 383 | $ids[$key] = $val[$index]; |
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| 384 | |||
| 385 | foreach (array_keys($val) as $field) |
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| 386 | { |
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| 387 | if ($field != $index) |
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| 388 | { |
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| 389 | $final[$field][$key] = 'When `'.$index.'` = "'.$val[$index].'" Then "'.$val[$field].'"'; |
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| 390 | } |
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| 391 | } |
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| 392 | } |
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| 393 | //$ids = array_values($ids); |
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| 394 | |||
| 395 | // 如果不是数组而且不为空，就转数组 |
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| 396 | if (!is_array($where) && !empty($where)) |
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| 397 | { |
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| 398 | $where = array($where); |
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| 399 | } |
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| 400 | $where[] = $index.' In ("'.implode('","', $ids).'")'; |
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| 401 | $where = empty($where) ? "" : " Where ".implode(" And ", $where); |
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| 402 | |||
| 403 | $sql = "Update `".$table."` Set "; |
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| 404 | $cases = ''; |
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| 405 | |||
| 406 | foreach ($final as $k => $v) |
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| 407 | { |
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| 408 | // 过滤掉数据库没有的字段 |
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| 409 | if (!in_array($k, $fields)) |
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| 410 | { |
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| 411 | continue; |
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| 412 | } |
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| 413 | $cases .= '`'.$k.'` = Case '."\n"; |
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| 414 | foreach ($v as $row) |
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| 415 | { |
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| 416 | $cases .= $row."\n"; |
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| 417 | } |
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| 418 | |||
| 419 | $cases .= 'Else `'.$k.'` End, '; |
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| 420 | } |
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| 421 | |||
| 422 | $sql .= substr($cases, 0, -2); |
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| 423 | |||
| 424 | // 其实不带 Where In ($index) 的条件也可以的 |
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| 425 | $sql .= $where; |
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| 426 | |||
| 427 | if ($return_sql) return $sql; |
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| 428 | |||
| 429 | $rt = self::query($sql); |
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| 430 | $insert_id = self::affected_rows(); |
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| 431 | $return = empty($affected_rows) ? $rt : $affected_rows; |
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| 432 | return $return; |
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| 433 | } |
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| 434 | |||
| 435 | public static function update($table = '', $data = array(), $where = null, $return_sql = false) |
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| 436 | { |
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| 437 | $sql = "UPDATE `{$table}` SET "; |
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| 438 | foreach ($data as $k => $v) |
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| 439 | { |
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| 440 | $v = stripslashes($v); |
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| 441 | $v = addslashes($v); |
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| 442 | $sql .= "`{$k}` = \"{$v}\","; |
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| 443 | } |
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| 444 | if (!is_array($where)) |
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| 445 | { |
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| 446 | $where = array($where); |
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| 447 | } |
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| 448 | // 删除空字段,不然array("")会成为WHERE |
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| 449 | foreach ($where as $k => $v) |
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| 450 | { |
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| 451 | if (empty($v)) |
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| 452 | { |
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| 453 | unset($where[$k]); |
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| 454 | } |
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| 455 | } |
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| 456 | $where = empty($where) ? "" : " Where " . implode(" And ", $where); |
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| 457 | $sql = substr($sql, 0, -1) . $where; |
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| 458 | if ($return_sql) |
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| 459 | { |
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| 460 | return $sql; |
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| 461 | } |
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| 462 | else |
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| 463 | { |
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| 464 | if (self::query($sql)) |
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| 465 | { |
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| 466 | return mysqli_affected_rows(self::$links[self::$link_name]['conn']); |
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| 467 | } |
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| 468 | else |
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| 469 | { |
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| 470 | return false; |
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| 471 | } |
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| 472 | } |
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| 473 | } |
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| 474 | |||
| 475 | public static function delete($table = '', $where = null, $return_sql = false) |
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| 476 | { |
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| 477 | // 小心全部被删除了 |
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| 478 | if (empty($where)) |
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| 479 | { |
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| 480 | return false; |
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| 481 | } |
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| 482 | $where = 'Where ' . (!is_array($where) ? $where : implode(' And ', $where)); |
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| 483 | $sql = "Delete From `{$table}` {$where}"; |
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| 484 | if ($return_sql) |
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| 485 | { |
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| 486 | return $sql; |
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| 487 | } |
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| 488 | else |
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| 489 | { |
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| 490 | if (self::query($sql)) |
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| 491 | { |
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| 492 | return mysqli_affected_rows(self::$links[self::$link_name]['conn']); |
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| 493 | } |
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| 494 | else |
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| 495 | { |
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| 496 | return false; |
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| 497 | } |
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| 498 | } |
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| 499 | } |
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| 500 | |||
| 501 | public static function ping() |
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| 502 | { |
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| 503 | if (!mysqli_ping(self::$links[self::$link_name]['conn'])) |
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| 504 | { |
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| 505 | @mysqli_close(self::$links[self::$link_name]['conn']); |
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| 506 | self::$links[self::$link_name]['conn'] = null; |
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| 507 | self::_init(); |
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| 508 | } |
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| 509 | } |
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| 510 | |||
| 511 | public static function strsafe($array) |
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| 541 | } |
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| 542 | } |
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| 543 | |||
| 544 | // 这个是给insert、update、insert_batch、update_batch用的 |
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| 545 | public static function get_fields($table) |
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| 546 | { |
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| 547 | // $sql = "SHOW COLUMNS FROM $table"; //和下面的语句效果一样 |
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| 548 | $rows = self::get_all("Desc `{$table}`"); |
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| 549 | $fields = array(); |
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| 550 | foreach ($rows as $k => $v) |
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| 551 | { |
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| 552 | // 过滤自增主键 |
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| 553 | // if ($v['Key'] != 'PRI') |
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| 554 | if ($v['Extra'] != 'auto_increment') |
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| 555 | { |
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| 556 | $fields[] = $v['Field']; |
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| 557 | } |
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| 558 | } |
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| 559 | return $fields; |
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| 560 | } |
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| 561 | |||
| 562 | public static function table_exists($table_name) |
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| 572 | } |
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| 573 | } |
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| 574 | |||
| 575 | |||
| 576 | |||
| 577 | |||
| 578 | |||
| 579 | |||
| 580 |
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In general, usage of exit should be done with care and only when running in a scripting context like a CLI script.