Laravel integer 值 DB 记录列的最大值限制

Question

How would I, if possible, create an integer column in my database with a max limit.

Example:

• Let's call the column X
• Let's say the max limit is "30"

• if X is set to 12, then that is a valid value.
• if X is set to 31, then that is an invalid value.

I would like to do this in the database layer and not in my application layer.

So what would I put in my database migration file?

Example migration file:

class CreateUsersTable extends Migration
{
    public function up()
    {
        Schema::create('users', function (Blueprint $table) {
            $table->id();
            $table->string('name');
            $table->rememberToken();
            $table->timestamps();
        });
    }

    public function down()
    {
        Schema::dropIfExists('users');
    }
}

Answer 1

Column value limitation can be done via check constraint

Blueprint does not support it.

You need to run raw sql query

public function up()
{
    // table creation
    DB::statement('
        ALTER TABLE users 
        ADD CONSTRAINT users_x_check CHECK (x > 0 AND x <= 30)
    ');
}

Answer 2

SQL Limit min and max value in database , no clue if laravel supports check constraints. But you can create the table by hand. - @DefinitelynotRafal