对 Laravel 中的 cursor 语句的原始查询

Question

我有一组原始查询，我想将它们转换为Illuminate\Database\Query\Builder ，然后通过 cursor() 方法获取它们的数据。 例如：

$queries = [];
$queries[] = 'SELECT * from users';
$queries[] = 'SELECT * from toys INNER JOIN users ON toys.owner_id = user.id';
$queries[] = 'SELECT * from toys';

$connection = \DB::connection();

foreach ($queries as $query) {
    $builder = $connection->query();
    // Pass some how the raw query to the builder
    $builder->raw($query);
    // Execute the statement with a cursor function
    foreach($builder->cursor() as $data) {
         // Do something
    }
}

我遇到的问题是如何将原始查询传递给 Builder，然后通过 cursor 方法获取数据。

有任何想法吗？

Answer 1

根据官方 API 文档，您应该能够像select()一样使用cursor() ) 。

$generator = DB::cursor('SELECT * from users'); 

foreach ($generator as $data) { ... }

$queries = [];
$queries[] = 'SELECT * from users';
$queries[] = 'SELECT * from toys INNER JOIN users ON toys.owner_id = user.id';
$queries[] = 'SELECT * from toys';

foreach ($queries as $query) {
    foreach(\DB::cursor($query) as $data) {
         // Do something
    }
}

\DB::connection()->cursor($query)与\DB::cursor($query)相同。 通过魔术方法__call ， DatabaseManager （ DB Facade）将 cursor 调用通过管道传递到默认连接。