#86: Automatic MySQL to PostgreSQL import

database/after-import.sql

@@ -0,0 +1,38 @@
+ALTER TABLE users ALTER created_at TYPE timestamp(0) without time zone, ALTER updated_at TYPE timestamp(0) without time zone, ALTER bio SET DEFAULT '';
+
+ALTER TABLE tracks ALTER created_at TYPE timestamp(0) without time zone,
+ALTER updated_at TYPE timestamp(0) without time zone,
+ALTER deleted_at TYPE timestamp(0) without time zone,
+ALTER published_at TYPE timestamp(0) without time zone,
+ALTER released_at TYPE timestamp(0) without time zone,
+ALTER license_id DROP NOT NULL,
+ALTER genre_id DROP NOT NULL,
+ALTER track_type_id DROP NOT NULL,
+ALTER description DROP NOT NULL,
+ALTER lyrics DROP NOT NULL,
+ALTER cover_id DROP NOT NULL,
+ALTER album_id DROP NOT NULL,
+ALTER track_number DROP NOT NULL,
+ALTER hash DROP NOT NULL,
+ALTER metadata DROP NOT NULL,
+ALTER original_tags DROP NOT NULL,
+ALTER is_vocal SET DEFAULT false,
+ALTER is_explicit SET DEFAULT false,
+ALTER is_downloadable SET DEFAULT false,
+ALTER view_count SET DEFAULT 0,
+ALTER play_count SET DEFAULT 0,
+ALTER download_count SET DEFAULT 0,
+ALTER favourite_count SET DEFAULT 0,
+ALTER comment_count SET DEFAULT 0,
+ALTER is_latest SET DEFAULT false,
+ALTER is_listed SET DEFAULT true;
+
+ALTER TABLE track_files ALTER created_at TYPE timestamp(0) without time zone, ALTER updated_at TYPE timestamp(0) without time zone;
+ALTER TABLE images ALTER created_at TYPE timestamp(0) without time zone, ALTER updated_at TYPE timestamp(0) without time zone;
+ALTER TABLE genres ALTER created_at TYPE timestamp(0) without time zone, ALTER updated_at TYPE timestamp(0) without time zone;
+ALTER TABLE resource_users ALTER is_followed SET DEFAULT false, ALTER is_favourited SET DEFAULT false, ALTER is_pinned SET DEFAULT false, ALTER view_count SET DEFAULT 0, ALTER play_count SET DEFAULT 0, ALTER download_count SET DEFAULT 0;
+ALTER TABLE comments ALTER ip_address DROP NOT NULL, ALTER profile_id DROP NOT NULL, ALTER track_id DROP NOT NULL, ALTER album_id DROP NOT NULL, ALTER playlist_id DROP NOT NULL, ALTER created_at TYPE timestamp(0) without time zone, ALTER updated_at TYPE timestamp(0) without time zone, ALTER deleted_at TYPE timestamp(0) without time zone;
+ALTER TABLE playlists ALTER created_at TYPE timestamp(0) without time zone, ALTER updated_at TYPE timestamp(0) without time zone, ALTER deleted_at TYPE timestamp(0) without time zone, ALTER track_count SET DEFAULT 0, ALTER view_count SET DEFAULT 0, ALTER download_count SET DEFAULT 0, ALTER favourite_count SET DEFAULT 0, ALTER follow_count SET DEFAULT 0, ALTER comment_count SET DEFAULT 0;
+ALTER TABLE playlist_track ALTER created_at TYPE timestamp(0) without time zone, ALTER updated_at TYPE timestamp(0) without time zone;
+ALTER TABLE albums ALTER created_at TYPE timestamp(0) without time zone, ALTER updated_at TYPE timestamp(0) without time zone, ALTER deleted_at TYPE timestamp(0) without time zone;
+ALTER TABLE show_songs ALTER created_at TYPE timestamp(0) without time zone, ALTER updated_at TYPE timestamp(0) without time zone, ALTER deleted_at TYPE timestamp(0) without time zone;

database/migrations/2016_07_14_154357_MysqlToPostgres.php

@@ -0,0 +1,73 @@
+<?php
+
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Database\Migrations\Migration;
+use Symfony\Component\Console\Output\ConsoleOutput;
+
+class MysqlToPostgres extends Migration
+{
+    private $console;
+
+    /**
+     * Run the migrations.
+     *
+     * @return void
+     */
+    public function up()
+    {
+        $this->console = new ConsoleOutput();
+
+        // Generate pgloader config
+        $mysqlConnection = "from mysql://" . env('DB_USERNAME') . ":" . env('DB_PASSWORD') . "@" . env('DB_HOST') . "/" . env('DB_DATABASE');
+        $postgresConnection = "into postgresql://" . env('POSTGRESQL_DB_USERNAME', 'homestead') . ":" . env('POSTGRESQL_DB_PASSWORD', 'secret') . "@" . env('POSTGRESQL_DB_HOST', 'localhost') . "/" . env('POSTGRESQL_DB_DATABASE', 'homestead');
+
+        $header = "LOAD DATABASE";
+        $body = <<<'EOD'
+with truncate
+
+CAST type datetime to timestamp drop default drop not null using zero-dates-to-null,
+      type date drop not null drop default using zero-dates-to-null
+
+EXCLUDING TABLE NAMES MATCHING 'migrations';
+EOD;
+
+        $output = implode("\n", array($header, $mysqlConnection, $postgresConnection, $body));
+        $configPath = base_path() . "/pfmimport.load";
+        file_put_contents($configPath, $output);
+
+        // Run pgloader
+        $this->execRunWithCallback("pgloader " . $configPath);
+
+        // Run after-import.sql
+        DB::unprepared(file_get_contents(base_path() . "/database/after-import.sql"));
+
+        // Remove pgloader config
+        unlink($configPath);
+    }
+
+    private function execRunWithCallback($command)
+    {
+        $array = array();
+        exec($command, $array);
+
+        if (!empty($array)) {
+            foreach ($array as $line) {
+                $this->execCallback($line);
+            }
+        }
+    }
+
+    private function execCallback($line) {
+        $this->console->writeln("[PGLOADER] " . $line);
+    }
+
+    /**
+     * Reverse the migrations.
+     *
+     * @return void
+     */
+    public function down()
+    {
+        //
+    }
+}