在laravel / lumen中创建临时表并插入数据

Question

I want to create temporary table in Laravel/Lumen and I made schema like this.

Schema::create('temp_image', function (Blueprint $table) {
    $table->increments('id');
    $table->string('link');
    $table->timestamps();
    $table->temporary();
});

When I run php artisan migrate I see...

Migrating: 2017_11_25_165640_create_temp_table
Migrated:  2017_11_25_165640_create_temp_table

... but it didn't create any tables. What happened?

Answer 1

Temporary tables are session based. It is not created on SQL Server . You can have a look in this article in laracast .

Temporary table can be used in lumen too. We can use Schema Builder to create table and drop table. Let assume, we have a function for a simple request. We could use temporary table like the following-

public function temporary_check()
{
    Schema::create('temp_message', function (Blueprint $table) {
        $table->increments('id');
        $table->integer('sender_id');
        $table->integer('receiver_id');
        $table->string('message');
        $table->timestamps();
        $table->temporary();
    });

    DB::table('temp_message')->insert(['sender_id'=>2,'receiver_id'=>3,'message'=>'message temp check']);

    $data = DB::table('temp_message')->get();

    Schema::drop('temp_message');

    return $data;
}

As Temporary Table are session based, you should always free-up memory by dropping tables at the end of your work.

Answer 2

A temporary table is a special type of table that allows you to store a temporary result set, which you can reuse several times in a single session . So, if you are trying to find them, you probably won't get it as they are session-based.

MySQL removes the temporary table automatically when the session ends or the connection is terminated.

You should keep in mind that these tables are created without indexes, so if your goal is to improve the speed of queries, adding an index after creating the table is usually desirable.

You can read more about it: http://www.mysqltutorial.org/mysql-temporary-table/