-- Обновление таблицы tickets для добавления полей закрытия
USE botyobshik;

-- Проверяем и добавляем колонку closed_by
SET @dbname = DATABASE();
SET @tablename = 'tickets';
SET @columnname = 'closed_by';
SET @preparedStatement = (SELECT IF(
  (
    SELECT COUNT(*) FROM INFORMATION_SCHEMA.COLUMNS
    WHERE
      (table_name = @tablename)
      AND (table_schema = @dbname)
      AND (column_name = @columnname)
  ) > 0,
  'SELECT 1',
  CONCAT('ALTER TABLE ', @tablename, ' ADD COLUMN ', @columnname, ' VARCHAR(255) AFTER admin_response')
));
PREPARE alterIfNotExists FROM @preparedStatement;
EXECUTE alterIfNotExists;
DEALLOCATE PREPARE alterIfNotExists;

-- Проверяем и добавляем колонку closed_at
SET @columnname = 'closed_at';
SET @preparedStatement = (SELECT IF(
  (
    SELECT COUNT(*) FROM INFORMATION_SCHEMA.COLUMNS
    WHERE
      (table_name = @tablename)
      AND (table_schema = @dbname)
      AND (column_name = @columnname)
  ) > 0,
  'SELECT 1',
  CONCAT('ALTER TABLE ', @tablename, ' ADD COLUMN ', @columnname, ' DATETIME AFTER closed_by')
));
PREPARE alterIfNotExists FROM @preparedStatement;
EXECUTE alterIfNotExists;
DEALLOCATE PREPARE alterIfNotExists;