এসকিউএল টেবিল কলামগুলিকে অদলবদল করা মাইএসকিউএল সহ স্ট্যান্ডার্ড স্টোরের অংশ - এটি পোস্টগ্র্রেএসকিউএল সহ (এখনও) সমর্থিত নয়। যদিও সরকারী উইকি সমস্যাটির নিজস্ব নিবন্ধটি উত্সর্গ করেছে, এটি এমন কোনও ব্যবহারিক সমাধান দেখায় না যা ভিউ, সূচক এবং ট্রিগারগুলিকে সমর্থন করে। নিম্নলিখিত শ্রেণীটি এই কাজটি করে (মাইএসকিউএল এবং পোস্টগ্রিএসকিউএল উভয়ের জন্য) হয় কমান্ড লাইনে - অথবা বিকল্পভাবে সরাসরি লারাভেল 5 এ।
<?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"]);
}
কমান্ড লাইনে কলটি স্ব-ব্যাখ্যামূলক:
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
লারাভেল 5 এ সংহতকরণটি কেবল অ্যাপ্লিকেশন / সহায়তা ফোল্ডারে কলাম কাস্টার.এফপি অনুলিপি করার মাধ্যমে দ্রুত সম্পন্ন হয়। তারপরে আপনি সরাসরি মাইগ্রেশনের মধ্যে কলামগুলি অদলবদল করতে পারেন:
<?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");
}
}