SQL таблицасынын тилкелерин алмаштыруу MySQL менен стандарттык репертуардын бир бөлүгү болуп саналат - бул PostgreSQL менен (азырынча) колдоого алынбайт. Расмий вики көйгөйгө өз макаласын арнаганына карабастан, көз караштарды, индекстерди жана триггерлерди колдогон эч кандай практикалык чечимди көрсөтпөйт. Кийинки класс бул ишти (MySQL жана PostgreSQL үчүн) же буйрук сабында - же болбосо түздөн-түз Laravel 5те аткарат.
<?php namespace App\Helpers; class ColumnChanger { public static $quotes; public static $path; public static function swap($table, $col1, $col2) { // initialize self::$quotes = self::getQuotes(); self::$path = self::getPath(); // export $content = self::exportDB(); // swap $content = self::swapNow($table, $col1, $col2, $content); // import self::importDB($content); } public static function getQuotes() { if (getenv("DB_CONNECTION") == "pgsql") { return ""; } if (getenv("DB_CONNECTION") == "mysql") { return "`"; } } public static function getPath() { if (getenv("DB_CONNECTION") == "pgsql") { $sql = new \PDO('pgsql:host=' . getenv('DB_HOST') . ';port=' . getenv('DB_PORT') . ';dbname=' . getenv('DB_DATABASE') , getenv('DB_USERNAME') , getenv('DB_PASSWORD')); $stmt = $sql->prepare("SHOW data_directory"); $stmt->execute(); $path = str_replace("data", "bin", $stmt->fetchObject()->data_directory) . "/"; } if (getenv("DB_CONNECTION") == "mysql") { $sql = new \PDO('mysql:host=' . getenv('DB_HOST') . ';port=' . getenv('DB_PORT') . ';dbname=' . getenv('DB_DATABASE') , getenv('DB_USERNAME') , getenv('DB_PASSWORD')); $stmt = $sql->prepare("SHOW VARIABLES LIKE 'basedir'"); $stmt->execute(); $path = $stmt->fetchObject()->Value . "bin/"; } return $path; } public static function exportDB() { if (getenv("DB_CONNECTION") == "pgsql") { putenv("PGPASSWORD=" . getenv('DB_PASSWORD')); exec('"' . self::$path . 'pg_dump" --clean --inserts -h ' . getenv('DB_HOST') . ' -p ' . getenv('DB_PORT') . ' -U ' . getenv('DB_USERNAME') . ' ' . getenv('DB_DATABASE') . ' > db.sql'); } if (getenv("DB_CONNECTION") == "mysql") { exec('"' . self::$path . 'mysqldump" -h ' . getenv('DB_HOST') . ' --port ' . getenv('DB_PORT') . ' -u ' . getenv('DB_USERNAME') . ' -p"' . getenv('DB_PASSWORD') . '" ' . getenv('DB_DATABASE') . ' > db.sql'); } return file_get_contents("db.sql"); } public static function importDB($content) { file_put_contents("db.sql", $content); if (getenv("DB_CONNECTION") == "pgsql") { putenv("PGPASSWORD=" . getenv('DB_PASSWORD')); exec('"' . self::$path . 'psql" -h ' . getenv('DB_HOST') . ' -p ' . getenv('DB_PORT') . ' -U ' . getenv('DB_USERNAME') . ' -d ' . getenv('DB_DATABASE') . ' -1 -f db.sql'); } if (getenv("DB_CONNECTION") == "mysql") { exec('"' . self::$path . 'mysql" -h ' . getenv('DB_HOST') . ' --port ' . getenv('DB_PORT') . ' -u ' . getenv('DB_USERNAME') . ' -p"' . getenv('DB_PASSWORD') . '" ' . getenv('DB_DATABASE') . ' --default-character-set=utf8 < db.sql'); } unlink("db.sql"); } public static function getPositions($haystack, $needle) { $positions = []; $lastPos = 0; while (($lastPos = strpos($haystack, $needle, $lastPos)) !== false) { $positions[] = $lastPos; $lastPos = $lastPos + strlen($needle); } return $positions; } public static function getEnd($content, $begin) { $end = $begin; $outside = true; while ($outside !== true || $content[$end] != ";") { if ($content[$end] == "'") { if ($end === 0 || $content[$end - 1] != "\\") { $outside = !$outside; } } $end++; } return ++$end; } public static function splitString($string) { return preg_split('/(?<!^)(?!$)/u', $string); } public static function getColumns($query) { $i = 0; $outside = true; $query = self::splitString($query); foreach($query as $i => $char) { if ($query[$i] == "'") { if ($i === 0 || $query[$i - 1] != "\\") { $outside = !$outside; } } if ($outside === true && $query[$i] == ",") { $query[$i] = "♥"; } $i++; } $query = implode("", $query); $cols = explode("♥", $query); return $cols; } public static function swapNow($table, $col1, $col2, $content) { // loop through relevant statements foreach(["CREATE TABLE " . self::$quotes . $table . self::$quotes, "INSERT INTO " . self::$quotes . $table . self::$quotes] as $skey => $statement) { $positions = self::getPositions($content, $statement); foreach($positions as $position) { $begin = $position; $end = self::getEnd($content, $begin); $query_all = substr($content, $begin, $end - $begin); $query_inside = substr($query_all, strpos($query_all, "(") + 1, strrpos($query_all, ")") - strpos($query_all, "(") - 1); // get columns $cols = self::getColumns($query_inside); // get relevant column indexes if ($skey == 0) { $col1pos = 0; $col2pos = 0; foreach($cols as $pos => $col) { $col = trim($col); if (strpos($col, self::$quotes . $col1 . self::$quotes) === 0) { $col1pos = $pos; } if (strpos($col, self::$quotes . $col2 . self::$quotes) === 0) { $col2pos = $pos; } } } // swap columns $tmp = $cols[$col1pos]; $cols[$col1pos] = $cols[$col2pos]; $cols[$col2pos] = $tmp; $query_inside_new = implode(",", $cols); // insert query into content $query_all_new = str_replace($query_inside, $query_inside_new, $query_all); $content = str_replace($query_all, $query_all_new, $content); } } return $content; } } // usage from the command line if (isset($argv) && is_array($argv)) { $args = []; foreach($argv as $key => $arg) { switch ($arg) { case "-e": $args["engine"] = $argv[$key + 1]; break; case "-h": $args["hostname"] = $argv[$key + 1]; break; case "-P": $args["port"] = $argv[$key + 1]; break; case "-u": $args["username"] = $argv[$key + 1]; break; case "-p": $args["password"] = $argv[$key + 1]; break; case "-d": $args["database"] = $argv[$key + 1]; break; case "-t": $args["table"] = $argv[$key + 1]; break; } } // set default values if (!isset($args["hostname"])) { $args["hostname"] = "127.0.0.1"; } if (!isset($args["port"]) && isset($args["engine"]) && $args["engine"] == "mysql") { $args["port"] = "3306"; } if (!isset($args["port"]) && isset($args["engine"]) && $args["engine"] == "pgsql") { $args["port"] = "5432"; } foreach($args as $option => $arg) { if (!isset($arg)) { die('missing option ' . $option); } } if (count($argv) < 2) { die('error'); } $args["col1"] = $argv[count($argv) - 2]; $args["col2"] = $argv[count($argv) - 1]; putenv("DB_CONNECTION=" . $args["engine"]); putenv("DB_HOST=" . $args["hostname"]); putenv("DB_PORT=" . $args["port"]); putenv("DB_DATABASE=" . $args["database"]); putenv("DB_USERNAME=" . $args["username"]); putenv("DB_PASSWORD=" . $args["password"]); ColumnChanger::swap($args["table"], $args["col1"], $args["col2"]); }
Буйрук тилкесиндеги чакыруу өзүн-өзү түшүндүрөт:
php ColumnChanger.php -e pgsql -h 127.0.0.1 -P 5432 -u username -p password -d database -t table col1 col2 php ColumnChanger.php -e mysql -h 127.0.0.1 -P 3306 -u username -p password -d database -t table col1 col2
Laravel 5ке интеграциялоо колонма / жардамчылар папкасына жөн гана ColumnChanger.php көчүрүп алуу менен тез жасалат. Андан кийин түздөн-түз миграция ичинде мамычаларды алмаштыра аласыз:
<?php use Illuminate\Database\Schema\Blueprint; use Illuminate\Database\Migrations\Migration; class SwitchColumns extends Migration { /** * Run the migrations. * * @return void */ public function up() { App\Helpers\ColumnChanger::swap("users","email","password"); } /** * Reverse the migrations. * * @return void */ public function down() { App\Helpers\ColumnChanger::swap("users","password","email"); } }