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Php Laravel很有说服力，我如何开始从结果集中列出数据？

php laravel

Php Laravel很有说服力，我如何开始从结果集中列出数据？,php,laravel,eloquent,Php,Laravel,Eloquent,我有一个表（型号名称：数据）： 以及一个用于检索数据的查询： $datum = Data::orderBy("data1")->paginate(10); 现在，查询总是从顶部的“A”开始，并通过所有3个页面到达“Z”，当用户最初点击屏幕时，这很好。如果用户编辑id=15 data1=“o”，如何在id 15或第2页重新启动列表，而不是返回列表顶部？根据您可以使用URL中的页面查询字符串指向特定页面。根据您可以使用URL中的页面查询字符串指向特定页面。您可以使用第四个参数 $datum

我有一个表（型号名称：数据）：

以及一个用于检索数据的查询：

$datum = Data::orderBy("data1")->paginate(10);
现在，查询总是从顶部的“A”开始，并通过所有3个页面到达“Z”，当用户最初点击屏幕时，这很好。如果用户编辑id=15 data1=“o”，如何在id 15或第2页重新启动列表，而不是返回列表顶部？

根据您可以使用URL中的
页面
查询字符串指向特定页面。

根据您可以使用URL中的
页面
查询字符串指向特定页面。

您可以使用第四个参数

$datum = Data::orderBy("data1")->paginate(10, ['*'], 'page', 2);
2-页码

您可以使用第四个参数

$datum = Data::orderBy("data1")->paginate(10, ['*'], 'page', 2);
2-页码

我建议使用：

快速回答：

$count = 26; 
$skip = 15;
$limit = $count - $skip;
$datum = Data::orderBy("data1")->skip($skip)->take($limit)->get();
说明：

$count = 26; 
$skip = 15;
$limit = $count - $skip;
$datum = Data::orderBy("data1")->skip($skip)->take($limit)->get();
1）首先，计算行数：

$count = Data::count(); 
// OR
$count = 26; // In your case (alphabet letters) you can set $count directly to 26
2）然后设置要跳过的行数（或从查询参数中获取，以便用户可以编辑表单）

3）计算剩余行数（所有要提取的行）

4）最后，收集数据，跳过前15个

$datum = Data::orderBy("data1")->skip($skip)->take($limit)->get(); 
// be aware that you can not paginate when using skip/take
我建议使用：

快速回答：

$count = 26; 
$skip = 15;
$limit = $count - $skip;
$datum = Data::orderBy("data1")->skip($skip)->take($limit)->get();
说明：

$count = 26; 
$skip = 15;
$limit = $count - $skip;
$datum = Data::orderBy("data1")->skip($skip)->take($limit)->get();
1）首先，计算行数：

$count = Data::count(); 
// OR
$count = 26; // In your case (alphabet letters) you can set $count directly to 26
2）然后设置要跳过的行数（或从查询参数中获取，以便用户可以编辑表单）

3）计算剩余行数（所有要提取的行）

4）最后，收集数据，跳过前15个

$datum = Data::orderBy("data1")->skip($skip)->take($limit)->get(); 
// be aware that you can not paginate when using skip/take
感谢Dry7、Giorgio.dev和PhilMarc。你们都给了我一个答案。最终的解决方案将要复杂得多。这是由于由于表（四列中的任意一列）的排序顺序和筛选出的记录数（三列中的任意一列）对页面计算进行了更改。如果新记录或编辑的记录不在筛选范围内，除清除筛选外。表的最新副本和我的代码（让我保留Laravel提供的分页）如下所示

mysql> show columns from mailing_classes;
+--------------------+---------------------+------+-----+---------+----------------+
| Field              | Type                | Null | Key | Default | Extra          |
+--------------------+---------------------+------+-----+---------+----------------+
| id                 | bigint(20) unsigned | NO   | PRI | NULL    | auto_increment |
| mailing_class_code | char(2)             | NO   | UNI | NULL    |                |
| description        | varchar(255)        | NO   |     | NULL    |                |
| created_by_id      | bigint(20) unsigned | NO   | MUL | NULL    |                |
| last_editted_by_id | bigint(20) unsigned | NO   | MUL | NULL    |                |
| created_at         | timestamp           | YES  |     | NULL    |                |
| updated_at         | timestamp           | YES  |     | NULL    |                |
+--------------------+---------------------+------+-----+---------+----------------+

public function index()
{

    $mailingClassSortOrder = session('mailingClassSortOrder');
    $mailingClassRestartValue = session('mailingClassRestartValue');
    $mailingClassSearchLeft = session('mailingClassSearchLeft');
    $mailingClassSearchRight = session('mailingClassSearchRight');
    $rows = 1;
    $page = 0;
    $restart = 0;
    $mcCode = '';
    $mcDescription = '';
    $mcUpdatedAt = '';

    if ($mailingClassRestartValue > 0) {
        $restartRows = MailingClass::where('id', '=', $mailingClassRestartValue)->get();
        foreach ($restartRows as $restartRow) {
            $mcCode = $restartRow->mailing_class_code;
            $mcDescription = $restartRow->description;
        }
        // if restart value does not appear in the filter then clear the filter
        // {deleted for sake of space}
        // find row position based on sort order
        if ($mailingClassSortOrder === "mailing_class_code") {
            // sorted by mailing_class_code column
            $rows = MailingClass::where('mailing_class_code', '<=', $restartRow->mailing_class_code)->count();
        } elseif ($mailingClassSortOrder === "id") {
            // sorted by id column
            $rows = MailingClass::where('id', '<=', $restartRow->id)->count();
        } elseif ($mailingClassSortOrder === "description") {
            // sorted by description column
            $rows = MailingClass::where('description', '<=', $restartRow->description)->count();
        } elseif ($mailingClassSortOrder === "updated_at") {
            // sorted by updated_at column
            $rows = MailingClass::where('updated_at', '<=', $restartRow->updated_at)->count();
        }
    }
    // calculate what should be the current page
    $page = intval($rows / 10) + 1;

    $searchText = '';
    $mailingClasses = [];
    if ($mailingClassSearchLeft === '') {
        if ($mailingClassRestartValue <= 0) {
            $mailingClasses = MailingClass::orderBy($mailingClassSortOrder)->paginate(10);
        } else {
            $mailingClasses = MailingClass::orderBy($mailingClassSortOrder)->paginate(10, ['*'], 'page', $page);
        }

    } elseif ($mailingClassSearchLeft === 'id') {
        // {deleted for sake of space}
    } elseif ($mailingClassSearchLeft === 'mailing_class_code') {
        // {deleted for sake of space}
    } elseif (session('mailingClassSearchLeft') === 'mailing_class_description') {
        // {deleted for sake of space}
    } else {
        // {deleted for sake of space}
    }

    return view(
        'maintenance.mailingclass.index',
        compact('mailingClasses', 'mmsGlobal', 'searchText')
    );
}

mysql>显示邮件类中的列；
+--------------------+---------------------+------+-----+---------+----------------+
|字段|类型|空|键|默认|额外|
+--------------------+---------------------+------+-----+---------+----------------+
|id | bigint（20）无符号| NO | PRI | NULL |自动增量|
|邮寄|类别|代码|字符（2）|否|唯一|空||
|description | varchar（255）| NO | | NULL ||
|由| id | bigint（20）无符号| NO | MUL | NULL |创建|
|上一次编辑由| id | bigint（20）unsigned | NO | MUL | NULL ||
|在|时间戳|是| |空|处创建|u|
|更新了|时间戳|是| |空||
+--------------------+---------------------+------+-----+---------+----------------+
公共职能指数（）
{
$mailingClassSortOrder=会话（'mailingClassSortOrder'）；
$mailingClassRestartValue=会话（'mailingClassRestartValue'）；
$mailingClassSearchLeft=会话（'mailingClassSearchLeft'）；
$mailingClassSearchRight=会话（'mailingClassSearchRight'）；
$rows=1；
$page=0；
$restart=0；
$mcCode=''；
$mcDescription=''；
$mcUpdatedAt=''；
如果（$mailingClassRestartValue>0）{
$restartRows=MailingClass:：where（'id'，'='，$mailingClassRestartValue）->get（）；
foreach（$restartRows作为$restartRow）{
$mcCode=$restartRow->邮寄类代码；
$mcDescription=$restartRow->description；
}
//如果重新启动值未出现在过滤器中，则清除过滤器
//{为节省空间而删除}
//根据排序顺序查找行位置
如果（$mailingClassSortOrder==“邮寄类别代码”）{
//按邮件类别代码列排序

$rows=MailingClass:：where（'mailing_class_code'），“感谢Dry7、Giorgio.dev和PhilMarc。你们都给了我一个答案。最终的解决方案会复杂得多。这是由于表（四列中的任何一列）的排序顺序以及我过滤掉的记录数量，页面计算发生了变化（三列中的任何一列）。除了在新记录或编辑的记录不在筛选范围内时清除筛选外，表和我的代码的最新副本（允许我保留Laravel提供的分页）如下所示：


mysql> show columns from mailing_classes;
+--------------------+---------------------+------+-----+---------+----------------+
| Field              | Type                | Null | Key | Default | Extra          |
+--------------------+---------------------+------+-----+---------+----------------+
| id                 | bigint(20) unsigned | NO   | PRI | NULL    | auto_increment |
| mailing_class_code | char(2)             | NO   | UNI | NULL    |                |
| description        | varchar(255)        | NO   |     | NULL    |                |
| created_by_id      | bigint(20) unsigned | NO   | MUL | NULL    |                |
| last_editted_by_id | bigint(20) unsigned | NO   | MUL | NULL    |                |
| created_at         | timestamp           | YES  |     | NULL    |                |
| updated_at         | timestamp           | YES  |     | NULL    |                |
+--------------------+---------------------+------+-----+---------+----------------+

public function index()
{

    $mailingClassSortOrder = session('mailingClassSortOrder');
    $mailingClassRestartValue = session('mailingClassRestartValue');
    $mailingClassSearchLeft = session('mailingClassSearchLeft');
    $mailingClassSearchRight = session('mailingClassSearchRight');
    $rows = 1;
    $page = 0;
    $restart = 0;
    $mcCode = '';
    $mcDescription = '';
    $mcUpdatedAt = '';

    if ($mailingClassRestartValue > 0) {
        $restartRows = MailingClass::where('id', '=', $mailingClassRestartValue)->get();
        foreach ($restartRows as $restartRow) {
            $mcCode = $restartRow->mailing_class_code;
            $mcDescription = $restartRow->description;
        }
        // if restart value does not appear in the filter then clear the filter
        // {deleted for sake of space}
        // find row position based on sort order
        if ($mailingClassSortOrder === "mailing_class_code") {
            // sorted by mailing_class_code column
            $rows = MailingClass::where('mailing_class_code', '<=', $restartRow->mailing_class_code)->count();
        } elseif ($mailingClassSortOrder === "id") {
            // sorted by id column
            $rows = MailingClass::where('id', '<=', $restartRow->id)->count();
        } elseif ($mailingClassSortOrder === "description") {
            // sorted by description column
            $rows = MailingClass::where('description', '<=', $restartRow->description)->count();
        } elseif ($mailingClassSortOrder === "updated_at") {
            // sorted by updated_at column
            $rows = MailingClass::where('updated_at', '<=', $restartRow->updated_at)->count();
        }
    }
    // calculate what should be the current page
    $page = intval($rows / 10) + 1;

    $searchText = '';
    $mailingClasses = [];
    if ($mailingClassSearchLeft === '') {
        if ($mailingClassRestartValue <= 0) {
            $mailingClasses = MailingClass::orderBy($mailingClassSortOrder)->paginate(10);
        } else {
            $mailingClasses = MailingClass::orderBy($mailingClassSortOrder)->paginate(10, ['*'], 'page', $page);
        }

    } elseif ($mailingClassSearchLeft === 'id') {
        // {deleted for sake of space}
    } elseif ($mailingClassSearchLeft === 'mailing_class_code') {
        // {deleted for sake of space}
    } elseif (session('mailingClassSearchLeft') === 'mailing_class_description') {
        // {deleted for sake of space}
    } else {
        // {deleted for sake of space}
    }

    return view(
        'maintenance.mailingclass.index',
        compact('mailingClasses', 'mmsGlobal', 'searchText')
    );
}



mysql>显示邮件类中的列；
+--------------------+---------------------+------+-----+---------+----------------+
|字段|类型|空|键|默认|额外|
+--------------------+---------------------+------+-----+---------+----------------+
|id | bigint（20）无符号| NO | PRI | NULL |自动增量|
|邮寄|类别|代码|字符（2）|否|唯一|空||
|description | varchar（255）| NO | | NULL ||
|由| id | bigint（20）无符号| NO | MUL | NULL |创建|
|上一次编辑由| id | bigint（20）unsigned | NO | MUL | NULL ||
|在|时间戳|是| |空|处创建|u|
|更新了|时间戳|是| |空||
+--------------------+---------------------+------+-----+---------+----------------+
公共职能指数（）
{
$mailingClassSortOrder=会话（'mailingClassSortOrder'）；
$mailingClassRestartValue=会话（'mailingClassRestartValue'）；
$mailingClassSearchLeft=会话（'mailingClassSearchLeft'）；