www.gusucode.com > KPPW众包威客PHP开源建站系统 v3.0源码程序 > KPPW/vendor/illuminate/database/Migrations/Migrator.php
<?php
namespace Illuminate\Database\Migrations;
use Illuminate\Support\Str;
use Illuminate\Filesystem\Filesystem;
use Illuminate\Database\ConnectionResolverInterface as Resolver;
class Migrator
{
/**
* The migration repository implementation.
*
* @var \Illuminate\Database\Migrations\MigrationRepositoryInterface
*/
protected $repository;
/**
* The filesystem instance.
*
* @var \Illuminate\Filesystem\Filesystem
*/
protected $files;
/**
* The connection resolver instance.
*
* @var \Illuminate\Database\ConnectionResolverInterface
*/
protected $resolver;
/**
* The name of the default connection.
*
* @var string
*/
protected $connection;
/**
* The notes for the current operation.
*
* @var array
*/
protected $notes = [];
/**
* Create a new migrator instance.
*
* @param \Illuminate\Database\Migrations\MigrationRepositoryInterface $repository
* @param \Illuminate\Database\ConnectionResolverInterface $resolver
* @param \Illuminate\Filesystem\Filesystem $files
* @return void
*/
public function __construct(MigrationRepositoryInterface $repository,
Resolver $resolver,
Filesystem $files)
{
$this->files = $files;
$this->resolver = $resolver;
$this->repository = $repository;
}
/**
* Run the outstanding migrations at a given path.
*
* @param string $path
* @param bool $pretend
* @return void
*/
public function run($path, $pretend = false)
{
$this->notes = [];
$files = $this->getMigrationFiles($path);
// Once we grab all of the migration files for the path, we will compare them
// against the migrations that have already been run for this package then
// run each of the outstanding migrations against a database connection.
$ran = $this->repository->getRan();
$migrations = array_diff($files, $ran);
$this->requireFiles($path, $migrations);
$this->runMigrationList($migrations, $pretend);
}
/**
* Run an array of migrations.
*
* @param array $migrations
* @param bool $pretend
* @return void
*/
public function runMigrationList($migrations, $pretend = false)
{
// First we will just make sure that there are any migrations to run. If there
// aren't, we will just make a note of it to the developer so they're aware
// that all of the migrations have been run against this database system.
if (count($migrations) == 0) {
$this->note('<info>Nothing to migrate.</info>');
return;
}
$batch = $this->repository->getNextBatchNumber();
// Once we have the array of migrations, we will spin through them and run the
// migrations "up" so the changes are made to the databases. We'll then log
// that the migration was run so we don't repeat it next time we execute.
foreach ($migrations as $file) {
$this->runUp($file, $batch, $pretend);
}
}
/**
* Run "up" a migration instance.
*
* @param string $file
* @param int $batch
* @param bool $pretend
* @return void
*/
protected function runUp($file, $batch, $pretend)
{
// First we will resolve a "real" instance of the migration class from this
// migration file name. Once we have the instances we can run the actual
// command such as "up" or "down", or we can just simulate the action.
$migration = $this->resolve($file);
if ($pretend) {
return $this->pretendToRun($migration, 'up');
}
$migration->up();
// Once we have run a migrations class, we will log that it was run in this
// repository so that we don't try to run it next time we do a migration
// in the application. A migration repository keeps the migrate order.
$this->repository->log($file, $batch);
$this->note("<info>Migrated:</info> $file");
}
/**
* Rollback the last migration operation.
*
* @param bool $pretend
* @return int
*/
public function rollback($pretend = false)
{
$this->notes = [];
// We want to pull in the last batch of migrations that ran on the previous
// migration operation. We'll then reverse those migrations and run each
// of them "down" to reverse the last migration "operation" which ran.
$migrations = $this->repository->getLast();
$count = count($migrations);
if ($count === 0) {
$this->note('<info>Nothing to rollback.</info>');
} else {
// We need to reverse these migrations so that they are "downed" in reverse
// to what they run on "up". It lets us backtrack through the migrations
// and properly reverse the entire database schema operation that ran.
foreach ($migrations as $migration) {
$this->runDown((object) $migration, $pretend);
}
}
return $count;
}
/**
* Rolls all of the currently applied migrations back.
*
* @param bool $pretend
* @return int
*/
public function reset($pretend = false)
{
$this->notes = [];
$migrations = array_reverse($this->repository->getRan());
$count = count($migrations);
if ($count === 0) {
$this->note('<info>Nothing to rollback.</info>');
} else {
foreach ($migrations as $migration) {
$this->runDown((object) ['migration' => $migration], $pretend);
}
}
return $count;
}
/**
* Run "down" a migration instance.
*
* @param object $migration
* @param bool $pretend
* @return void
*/
protected function runDown($migration, $pretend)
{
$file = $migration->migration;
// First we will get the file name of the migration so we can resolve out an
// instance of the migration. Once we get an instance we can either run a
// pretend execution of the migration or we can run the real migration.
$instance = $this->resolve($file);
if ($pretend) {
return $this->pretendToRun($instance, 'down');
}
$instance->down();
// Once we have successfully run the migration "down" we will remove it from
// the migration repository so it will be considered to have not been run
// by the application then will be able to fire by any later operation.
$this->repository->delete($migration);
$this->note("<info>Rolled back:</info> $file");
}
/**
* Get all of the migration files in a given path.
*
* @param string $path
* @return array
*/
public function getMigrationFiles($path)
{
$files = $this->files->glob($path.'/*_*.php');
// Once we have the array of files in the directory we will just remove the
// extension and take the basename of the file which is all we need when
// finding the migrations that haven't been run against the databases.
if ($files === false) {
return [];
}
$files = array_map(function ($file) {
return str_replace('.php', '', basename($file));
}, $files);
// Once we have all of the formatted file names we will sort them and since
// they all start with a timestamp this should give us the migrations in
// the order they were actually created by the application developers.
sort($files);
return $files;
}
/**
* Require in all the migration files in a given path.
*
* @param string $path
* @param array $files
* @return void
*/
public function requireFiles($path, array $files)
{
foreach ($files as $file) {
$this->files->requireOnce($path.'/'.$file.'.php');
}
}
/**
* Pretend to run the migrations.
*
* @param object $migration
* @param string $method
* @return void
*/
protected function pretendToRun($migration, $method)
{
foreach ($this->getQueries($migration, $method) as $query) {
$name = get_class($migration);
$this->note("<info>{$name}:</info> {$query['query']}");
}
}
/**
* Get all of the queries that would be run for a migration.
*
* @param object $migration
* @param string $method
* @return array
*/
protected function getQueries($migration, $method)
{
$connection = $migration->getConnection();
// Now that we have the connections we can resolve it and pretend to run the
// queries against the database returning the array of raw SQL statements
// that would get fired against the database system for this migration.
$db = $this->resolveConnection($connection);
return $db->pretend(function () use ($migration, $method) {
$migration->$method();
});
}
/**
* Resolve a migration instance from a file.
*
* @param string $file
* @return object
*/
public function resolve($file)
{
$file = implode('_', array_slice(explode('_', $file), 4));
$class = Str::studly($file);
return new $class;
}
/**
* Raise a note event for the migrator.
*
* @param string $message
* @return void
*/
protected function note($message)
{
$this->notes[] = $message;
}
/**
* Get the notes for the last operation.
*
* @return array
*/
public function getNotes()
{
return $this->notes;
}
/**
* Resolve the database connection instance.
*
* @param string $connection
* @return \Illuminate\Database\Connection
*/
public function resolveConnection($connection)
{
return $this->resolver->connection($connection);
}
/**
* Set the default connection name.
*
* @param string $name
* @return void
*/
public function setConnection($name)
{
if (! is_null($name)) {
$this->resolver->setDefaultConnection($name);
}
$this->repository->setSource($name);
$this->connection = $name;
}
/**
* Get the migration repository instance.
*
* @return \Illuminate\Database\Migrations\MigrationRepositoryInterface
*/
public function getRepository()
{
return $this->repository;
}
/**
* Determine if the migration repository exists.
*
* @return bool
*/
public function repositoryExists()
{
return $this->repository->repositoryExists();
}
/**
* Get the file system instance.
*
* @return \Illuminate\Filesystem\Filesystem
*/
public function getFilesystem()
{
return $this->files;
}
}