先在命令行中输入mongo，进入mongo，然后
show dbs # 从结果中发现有cmb_demo_23_hacker
use cmb_demo_23_hacker
db.all_in_one.find({"_id":15480},{"raw_doc.text_html":1}) 然后我想看看cmb_demo_23_hacker里面有多少篇文章
> show collections #相当于查看表名
all_in_one
es > db.all_in_one.find({}).count()
575324