mongdob实现类似数据库order by (case lczc = 1 when 100 else lczc) 的排序方式db.doctorinfo.aggregate({ "$match" : { "cityId" : 118}}, { "$project" : {"deptName" : 1 ,"doctorName":1,"doctorSn":1, "doctorUid" ...

db.doctorinfo.aggregate([ { "$match" : {"provinceId":13, "doctorService_phone" : "1" , "displayStatus" : 1}},{ "$group" : { "_id" : { "standardDeptId" : "$standardDeptId"} , "standardDeptId" : { "$...

db.集合.函数({字段:{$exists:true}})案例：db.doctorinfo.count({zxExtendKey:{$exists:true}})

db.文档.find({"列":{$type:Type Number}}).forEach( function(x){ x.列=new NumberInt(x.列); db.文档.save(x); } ); 例如：db.doctorArticle.update({Article_Type: { $ne : 2 }},{$set:{Article_Type:new NumberI...