[Laravel] Laravel的基本数据库操作部分,laravel数据库
[Laravel] Laravel的基本数据库操作部分,laravel数据库
[laravel] laravel的数据库配置
找到程序目录结构下.env文件
配置基本的数据库连接信息
DB_HOST=127.0.0.1
DB_PORT=3306
DB_DATABASE=blog
DB_USERNAME=root
DB_PASSWORD=root
修改完.env文件需要重启服务
[laravel] laravel的数据库入门
控制器中导入DB数据库操作类,use DB
使用DB类的静态方法select来查询数据库,DB::select(),参数:sql语句,参数值数组
例如:$user=DB::select("select * from article where id=?",array("1"));
获取到一个数组,数组中的每一个结果是一个StdClass对象
<?<span>php namespace App\Http\Controllers\Index; </span><span>use</span><span> App\Http\Controllers\Controller; </span><span>use</span><span> DB; </span><span>class</span> IndexController <span>extends</span><span> Controller{ </span><span>public</span> <span>function</span><span> index(){ </span><span>$data</span>=<span>array</span><span>(); </span><span>$data</span>['title']="Index控制器"<span>; </span><span>//</span><span> 第一种</span> <span>$user</span>=DB::select("select * from article where id=?",<span>array</span>("1"<span>)); </span><span>foreach</span> (<span>$user</span> <span>as</span> <span>$v</span><span>) { </span><span>echo</span> <span>$v</span>-><span>title; } </span><span>//</span><span> 第二种</span> <span>$users</span>=DB::table("article")-><span>get(); </span><span>foreach</span> (<span>$user</span> <span>as</span> <span>$v</span><span>) { </span><span>echo</span> <span>$v</span>-><span>title; } </span><span>return</span> view("index.index",<span>$data</span><span>); } }</span>
使用查询构造器
使用DB::table(),得到查询构造器对象,参数:表名
调用Builder对象的get()方法,得到数组数据
例如:$users=DB::table("article")->get();
查询构造器是链式调用的,还有其他方法,可以去查看文档
[laravel] 数据库的迁移
使用Artisan命令创建迁移,make:migration 名称 –create 表名
例如:php artisan make:migration create_users_table --create=users
此命令会在database/migrations目录下面创建一个迁移文件
打开生成的迁移文件,在up方法里面进行字段的创建,这里会用到数据库的结构构造器Schema
运行迁移命令,使用命令 php artisan migrate,会在数据库中自动创建表
[laravel] Eloquent模型
使用Eloquent模型为表建立映射模型ORM,使用Artisan命令 make:model 模型名称
例如:php artisan make:model User
在app目录下生成一个User.php的模型文件

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