122 lines
2.8 KiB
Markdown
122 lines
2.8 KiB
Markdown
# 表格数据源
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## 数据来自模型
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如果使用模型来获取数据，那么修改来源数据就非常简单：
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```php
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// 添加默认查询条件
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$grid->model()->where('id', '>', 100);
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// 设置初始排序条件
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$grid->model()->orderBy('id', 'desc');
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...
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```
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其它查询方法可以参考`eloquent`的查询方法.
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## 数据来自外部API
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如果数据是来自外部的API，需要展示在数据表格中那么可以建立model,然后覆盖掉模型的几个获取数据的方法来实现, 下面的例子用`豆瓣电影`的API获取并展示数据：
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```php
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<?php
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namespace App\Models\Movie;
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use Illuminate\Database\Eloquent\Model;
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use Illuminate\Pagination\LengthAwarePaginator;
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use Illuminate\Support\Facades\Request;
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class InTheater extends Model
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{
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public function paginate()
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{
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$perPage = Request::get('per_page', 10);
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$page = Request::get('page', 1);
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$start = ($page-1)*$perPage;
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$data = file_get_contents("https://api.douban.com/v2/movie/in_theaters?city=上海&start=$start&count=$perPage");
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$data = json_decode($data, true);
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extract($data);
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$movies = static::hydrate($subjects);
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$paginator = new LengthAwarePaginator($movies, $total, $perPage);
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$paginator->setPath(url()->current());
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return $paginator;
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}
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public static function with($relations)
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{
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return new static;
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}
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}
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```
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通过覆盖模型的`paginate`和`with`方法获取API数据, 通过`findOrFail`方法来获取单项数据展示在表单中
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同理如果要在form表单中获取或者保存数据那么也可以通过覆盖相应的方法来实现：
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```php
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// 获取单项数据展示在form中
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public function findOrFail($id)
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{
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$data = file_get_contents("http://api.douban.com/v2/movie/subject/$id");
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$data = json_decode($data, true);
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return static::newFromBuilder($data);
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}
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// 保存提交的form数据
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public function save(array $options = [])
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{
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$attributes = $this->getAttributes();
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// save $attributes
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}
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```
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## 数据来自复杂SQL查询
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如果来源数据需要执行比较复杂的SQL语句获取，那么有两个办法, 第一个办法就是上面的方法，覆盖掉model的方法实现
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```php
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public function paginate()
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{
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$perPage = Request::get('per_page', 10);
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$page = Request::get('page', 1);
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$start = ($page-1)*$perPage;
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// 运行sql获取数据数组
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$sql = 'select * from ...';
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$result = DB::select($sql);
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$movies = static::hydrate($result);
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$paginator = new LengthAwarePaginator($movies, $total, $perPage);
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$paginator->setPath(url()->current());
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return $paginator;
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}
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public static function with($relations)
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{
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return new static;
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}
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```
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第二个方式是在数据库中建立视图和model绑定（未测试过，理论上可行）
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