五步搞定Laravel Migrations的使用

本文给大家介绍，主要内容是“Laravel如何使用Migrations”，希望对需要的朋友有所帮助！

Laravel：使用Migrations

1、首先利用artisan创建一个可迁移的数据表模板，该命令运行后会在database/migrations目录下生成一个文件

php artisan make:migration create_fees_count_table --create=fees_count

2、生成的文件包含up和down两个方法，其中up中是包含了添加表，添加列，添加索引等等一切的描述，down比较简单，就是删除表，当然里面还可以有一些其他逻辑

3、up中支持的数据表列类型，做个备注，暂时不做翻译

CommandDescription$table->bigIncrements('id');Incrementing ID (primary key) using a "UNSIGNED BIG INTEGER" equivalent.$table->bigInteger('votes');BIGINT equivalent for the database.$table->binary('data');BLOB equivalent for the database.$table->boolean('confirmed');BOOLEAN equivalent for the database.$table->char('name', 4);CHAR equivalent with a length.$table->date('created_at');DATE equivalent for the database.$table->dateTime('created_at');DATETIME equivalent for the database.$table->decimal('amount', 5, 2);DECIMAL equivalent with a precision and scale.$table->double('column', 15, 8);DOUBLE equivalent with precision, 15 digits in total and 8 after the decimal point.$table->enum('choices', ['foo', 'bar']);ENUM equivalent for the database.$table->float('amount');FLOAT equivalent for the database.$table->increments('id');Incrementing ID (primary key) using a "UNSIGNED INTEGER" equivalent.$table->integer('votes');INTEGER equivalent for the database.$table->json('options');JSON equivalent for the database.$table->jsonb('options');JSONB equivalent for the database.$table->longText('description');LONGTEXT equivalent for the database.$table->mediumInteger('numbers');MEDIUMINT equivalent for the database.$table->mediumText('description');MEDIUMTEXT equivalent for the database.$table->morphs('taggable');Adds INTEGER taggable_id and STRING taggable_type.$table->nullableTimestamps();Same as timestamps(), except allows NULLs.$table->rememberToken();Adds remember_token as VARCHAR(100) NULL.$table->smallInteger('votes');SMALLINT equivalent for the database.$table->softDeletes();Adds deleted_at column for soft deletes.$table->string('email');VARCHAR equivalent column.$table->string('name', 100);VARCHAR equivalent with a length.$table->text('description');TEXT equivalent for the database.$table->time('sunrise');TIME equivalent for the database.$table->tinyInteger('numbers');TINYINT equivalent for the database.$table->timestamp('added_on');TIMESTAMP equivalent for the database.$table->timestamps();Adds created_at and updated_at columns.$table->uuid('id');UUID equivalent for the database.

4、表创建完成后，直接执行，由于我之前很多表创建并没有使用php artisan migrate，所以直接运行该命令导致提示部分表存在，所以，我把这个文件转移到database下tmp目录下，命令上添加 --path 'database/tmp'，再次运行成功

php artisan  migrate

5、数据库中观察即发现表已创建！