ALTER TABLE teacher_books ADD COLUMN status INT NOT NULL DEFAULT 0 COMMENT '0=下架, 1=上架';
ALTER TABLE teacher_grade_subject ADD COLUMN status INT NOT NULL DEFAULT 0 COMMENT '0=下架, 1=上架';
ALTER TABLE teacher_previews ADD COLUMN video_url LONGTEXT NOT NULL COMMENT '视频地址';
ALTER TABLE teacher_reviews ADD COLUMN video_url LONGTEXT NOT NULL COMMENT '视频地址';
ALTER TABLE teacher_plan_contents ADD COLUMN video_url LONGTEXT NOT NULL COMMENT '视频地址';
