Java執行Mongodb原始查詢

Question

有沒有辦法以SQL的形式執行MongoDB查詢，類似於JDBC Statement。

例如我想執行查詢db.products.find({"_id" : ObjectId("56eadecd69eefd335e8d8f0d")}).pretty();，因爲它使用Java。你能分享一些例子嗎？我想下面的代碼

BasicDBObject obj = new BasicDBObject(); 
obj.append("$eval", query); 
CommandResult cr = mongoTemplate.executeCommand(obj); 
String createdBy = cr.getString("createdBy"); 

但它返回錯誤

{ "serverUsed" : "xxxxx" , "ok" : 0.0 , "errmsg" : "not authorized on shopchatdb to execute command { $eval: \"db.products.find({\"_id\" : ObjectId(\"56eadecd69eefd335e8d8f0d\")}).pretty()\" }" , "code" : 13} 

Answer 1

使用Jongo圖書館，查詢語法是完全同樣在蒙戈外殼查詢。

Jongo相當於您所查詢的是：

DB db = new MongoClient().getDB("dbname"); 

Jongo jongo = new Jongo(db); 
MongoCollection products = jongo.getCollection("products"); 

MongoCursor<Product> all = friends.find("{"_id" : ObjectId("56eadecd69eefd335e8d8f0d")}").as(Product.class); 

//Product.java is your POJO