-- 联赛管理增加“热门联赛”配置字段，可重复执行。
SET @schema_name = DATABASE();
SET @has_is_hot = (
    SELECT COUNT(*)
    FROM information_schema.COLUMNS
    WHERE TABLE_SCHEMA = @schema_name
      AND TABLE_NAME = 'la_league'
      AND COLUMN_NAME = 'is_hot'
);
SET @alter_sql = IF(
    @has_is_hot = 0,
    'ALTER TABLE `la_league` ADD COLUMN `is_hot` tinyint unsigned NOT NULL DEFAULT 0 COMMENT ''是否热门联赛: 0=否 1=是'' AFTER `is_show`',
    'SELECT ''la_league.is_hot already exists'''
);
PREPARE alter_stmt FROM @alter_sql;
EXECUTE alter_stmt;
DEALLOCATE PREPARE alter_stmt;