Laravel Migrate

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database\migrations\2017_XX_XX_XXXXXX_create_books_table.php

注意：XX代表时间戳，因时而异


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<?php

use Illuminate\Database\Schema\Blueprint;

use Illuminate\Database\Migrations\Migration;

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 Illuminate\Database\Migrations;

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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<?php

use Illuminate\Database\Schema\Blueprint;

use Illuminate\Database\Migrations\Migration;

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 Illuminate\Support\Facades;

/**

 * @see \Illuminate\Database\Schema\Builder

 */

class Schema extends Facade

{

    /**

     * Get a schema builder instance for a connection.

     *

     * @param  string  $name

     * @return \Illuminate\Database\Schema\Builder

     */

    public static function connection($name)

    {

        return static::$app[‘db‘]->connection($name)->getSchemaBuilder();

    }

    /**

     * Get a schema builder instance for the default connection.

     *

     * @return \Illuminate\Database\Schema\Builder

     */

    protected static function getFacadeAccessor()

    {

        return static::$app[‘db‘]->connection()->getSchemaBuilder();

    }

}

时间： 2024-10-11 01:20:05

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