Codeigniter v4 分页库

Question

我在 github 上用这个 link https://github.com/KejawenLab/CI4Pager 找到了 Codeigniter 4 的分页库。我遵循了每一步，但是我在显示数据时遇到了问题，即使我提供了每页显示的数量限制，我也得到了所有数据。但是对于分页 links 它工作正常。请帮忙，我怎样才能限制结果的数量。

这是我的代码

//控制器

    public function index()
    {
        helper('paginator');
        $db = \Config\Database::connect();
        $result = $db->query('SELECT * FROM users');
        $paginator = \App\Libraries\Paginator::createFromResult($result, 1, 1);
        return view('page', ['paginator'=> $paginator]);
    }

//查看

    <?php foreach($paginator->getResults() as $row):?>
        <div><?= $row['username'] ?></div>
    <?php endforeach;?>

    <?= ci_pager($paginator, [
            'base_url' => '/vyombo',
            'current_text' => 'Current Page',
            'total_text' => 'Total Records',
        ]);
    ?>

Answer 1

不需要外部库。 Codeigniter 4 支持开箱即用的分页。

您可以对查询结果进行分页，也可以手动对数组进行分页。

https://codeigniter.com/user_guide/libraries/pagination.html?highlight=pagination

万一您在控制器中进行查询，这远非理想。在您的情况下，您想创建一个模型来处理该问题，然后使用该模型。

// In the Controller
public function index()
{
    $userModel = new \App\Models\UserModel();
    $pageModel = new \App\Models\PageModel();

    $data = [
        'users' => $userModel->paginate(10, 'group1'),
        'pages' => $pageModel->paginate(15, 'group2'),
        'pager' => $userModel->pager
    ];

    echo view('users/index', $data);
}

那么在您看来，您可以获得完整链接或简单链接。

// In the views:
<?= $pager->links('group1') ?>
<?= $pager->simpleLinks('group2') ?>

如果您仍想手动对查询进行分页，您可以这样做：

假设您有一个名为 page=1 的查询字符串。然后每页需要 10 个元素。

只需像这样查询：

$limit = 10;
$offset = 10 * ($_GET['page'] - 1); 

SELECT *
FROM articles
LIMIT $limit, $offset;

然后要在您的视图中打印分页链接，您只需使用：

<?= $pager->makeLinks($_GET['page'], $limit, $total) ?>

所以对于您的分页，您总是需要两个查询。一个给你当前页面，另一个给你总结果。

Answer 2

通过创建附加视图 table 来解决具有多个 table 的查询 SQL语句“”CREATE OR REPLACE VIEW view_province_incomes AS”，并将table 属性设置为受保护的模型函数$table = 'default_table' ; 但替换 table 内部方法。例如“$this->table = 'view_province_incomes'”，view_province_incomes 自动添加到您的数据库并保存您的命令数据。

//型号

      public function getData()
      {
          //reset table to be used as default
          $this->table = 'view_province_incomes';

          //creating view table to your database to hold the data
            $sql = "CREATE OR REPLACE VIEW view_province_incomes AS ";
          $sql .= "
          SELECT Date, 
          SUM(Income) as Income, 
          SUM(Expense) as Expense, 
          SUM(Income) - SUM(Expense) as Profit 
          FROM ( 
                    SELECT 
                        province_income.date as Date, 
                        province_income.amount as Income, 
                        0 as Expense 
                    FROM province_income
                    LEFT JOIN province ON province.provId = province_income.provId
                    WHERE province_income.provId = 5
                    UNION ALL 
                    SELECT 
                        province_expenses.date as Date, 
                        0 as Income, 
                       province_expenses.amount as Expense 
                    FROM province_expenses
                    LEFT JOIN province ON province.provId = province_expenses.provId
                    WHERE province_expenses.provId = 5 
             ) as t 
          GROUP BY Date
        ";
        
        $this->db->query($sql);
        return $this; //to make easy chaining with the instance
      }

//控制器

    public function index()
    {
        $data['results'] = $this->model->getData()->asObject()->paginate(4);
        $data['pager']   = $this->model->pager->links();
        return view('Income/index', $data);
    }

// 观看次数

    <?php foreach ($results as $result): ?>
      <div style="display: flex; justify-content: space-between;">
        <p> <?= $result->Date ?></p>
        <p> <?= $result->Income ?></p>
        <p> <?= $result->Expense ?></p>
        <p> <?= $result->Profit ?></p>
      </div>
    <?php endforeach;?>

    <!-- pagination links -->
    <?= $pager ?>

// 输出

    +------------+-----------------------------+
    | Date       | Incomes  | Expense | Profit |
    +------------+----------+---------+--------+
    | 2018-06-12 | 10000    | 5000    | 5000   | 
    +------------+----------+---------+--------+
    | 2018-06-14 | 17000    | 9000    | 8000   | 
    +------------+----------+---------+--------+
    | 2018-06-15 | 8000     | 6000    | 2000   |
    +------------------------------------------+

Codeigniter v4 分页库

Codeigniter v4 pagination Library

codeigniter

codeigniter-4