artisan命令行创建migrate
格式：
| 1 | php artisan make:migration YourFileName |
示例：
| 1 | php artisan make:migration create_books_table |
我们找到laravel目录下databasemigrations2017_XX_XX_XXXXXX_create_books_table.php
注意：XX代表时间戳，因时而异
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<?phpuse IlluminateDatabaseSchemaBlueprint;use IlluminateDatabaseMigrationsMigration;class CreateBooksTable extends Migration{ /** * Run the migrations. * * @return void */ public function up() { // } /** * Reverse the migrations. * * @return void */ public function down() { // }} |
这里的CreateBooksTable类继承了Migration，我们看下Migration类
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namespace IlluminateDatabaseMigrations;abstract class Migration{ /** * The name of the database connection to use. * * @var string */ protected $connection; /** * Get the migration connection name. * * @return string */ public function getConnection() { return $this->connection; }} |
这里我们把up函数改写成
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public function up(){ Schema::create('chs', function (Blueprint $table) { $table->increments('id'); $table->string('slug')->unique();//additional $table->string('title');//additional $table->text('content');//additional $table->timestamps(); $table->timestamp('published_at')->index();//additional });} |
同时参考以下文档，文档选自http://laravelbook.com/laravel-migrations-managing-databases/
一切准备就绪，我们开始迁移
| 1 | php artisan migrate |
如果你迁移后发觉并不是你想要的数据表，可以回滚
| 1 | php artisan migrate:rollback |
这里要给大家提个醒，down方法一定要写，可能有些人这个方法会空着，觉得只要数据表创建出来了就没事了，但是一旦涉及rollback又没有down方法，你的migrate操作就是不可逆的！
就像这样：
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<?phpuse IlluminateDatabaseSchemaBlueprint;use IlluminateDatabaseMigrationsMigration;class CreateCommentsTable extends Migration{ /** * Run the migrations. * * @return void */ public function up() { Schema::create('comments', function (Blueprint $table) { $table->increments('id'); $table->integer('postid'); $table->string('title');//additional $table->text('content');//additional //$table->timestamps(); $table->timestamp('published_at')->index();//additional }); } /** * Reverse the migrations. * * @return void */ public function down() { Schema::drop('comments'); }} |
Laravel使用了门面模式
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namespace IlluminateSupportFacades;/** * @see IlluminateDatabaseSchemaBuilder */class Schema extends Facade{ /** * Get a schema builder instance for a connection. * * @param string $name * @return IlluminateDatabaseSchemaBuilder */ public static function connection($name) { return static::$app['db']->connection($name)->getSchemaBuilder(); } /** * Get a schema builder instance for the default connection. * * @return IlluminateDatabaseSchemaBuilder */ protected static function getFacadeAccessor() { return static::$app['db']->connection()->getSchemaBuilder(); }} |