#解决升级 WordPress 时提示“另一更新正在进行”
delete from wp_options where option_name='core_updater.lock';

#替换字符串
UPDATE ir_art SET cnt = REPLACE (cnt, '旧字符串', '新字符串'); 

#如果要删除字符串，新字符串为空即可
UPDATE ir_art SET cnt = REPLACE (cnt, '旧字符串', '');