Creating MYSQL Procedure in Laravel 4 Migrations

There are two major problems with your code

1. DELIMITER is not a valid sql statement. It’s just a MySql client command. So just don’t use it. BTW the error you get tells you exactly that.
2. You can’t use DB::statement to execute CREATE PROCEDURE code because it uses prepared statement source code for Connection. You can use PDO exec() DB::connection()->getPdo()->exec() instead

That being said a sample migration for imaginary tags table might look like this

class CreateTagsTable extends Migration {

    /**
     * Run the migrations.
     *
     * @return void
     */
    public function up()
    {
        Schema::create('tags', function($table){
            $table->increments('id');
            $table->string('name')->unique();
        });
$sql = <<<SQL
DROP PROCEDURE IF EXISTS sp_insert_tag;
CREATE PROCEDURE sp_insert_tag(IN _name VARCHAR(32))
BEGIN
    INSERT INTO `tags`(`name`) VALUES(_name);
END
SQL;
        DB::connection()->getPdo()->exec($sql);
    }

    /**
     * Reverse the migrations.
     *
     * @return void
     */
    public function down()
    {
        $sql = "DROP PROCEDURE IF EXISTS sp_insert_tag";
        DB::connection()->getPdo()->exec($sql);
        Schema::drop('tags');
    }
}