Att byta SQL-tabellkolumner är en del av standardrepertoaren med MySQL - detta stöds inte (ännu) med PostgreSQL. Även om den officiella wiki ägnar sin egen artikel åt problemet, visar den inte någon praktisk lösning som också stöder åsikter, index och utlösare. Följande klass gör det här jobbet (för både MySQL och PostgreSQL) antingen på kommandoraden - eller alternativt direkt i Laravel 5.
<?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"]); }
Samtalet på kommandoraden är självförklarande:
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
Integrationen i Laravel 5 görs också snabbt genom att helt enkelt kopiera ColumnChanger.php till mappen app / Helpers. Du kan sedan byta kolumner direkt i migreringar:
<?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"); } }