[英]Mapping a JAVA object with a MongoDB document using jongo
嗨,我有以下格式的集合
{
"_id" : ObjectId("572eb5df1d739cc73c21f953"),
"address" : {
"building" : "469",
"coord" : [
-73.961704,
40.662942
],
"street" : "Flatbush Avenue",
"zipcode" : "11225"
},
"borough" : "Brooklyn",
"cuisine" : "Hamburgers",
"grades" : [
{
"date" : ISODate("2014-12-30T00:00:00Z"),
"grade" : "A",
"score" : 8
},
{
"date" : ISODate("2014-07-01T00:00:00Z"),
"grade" : "B",
"score" : 23
},
{
"date" : ISODate("2013-04-30T00:00:00Z"),
"grade" : "A",
"score" : 12
},
{
"date" : ISODate("2012-05-08T00:00:00Z"),
"grade" : "A",
"score" : 12
}
],
"name" : "Wendy'S",
"restaurant_id" : "30112340"
}
我做了3個非常簡單的類來映射對象。 餐廳,地址和等級。 他們有以下格式餐廳
public String _id;
public Address address;
public String town;
public String cuisine;
public String name;
public String r_id;
public Grade [] grades;
地址
public int building;
public String street;
public long zip;
public float [] coord;
年級
public String date;
public char grade;
public int score;
我已經編寫了最簡單的代碼,只是將toString()映射為對象,然后看看我得到了什么
DB db = new MongoClient().getDB("test");
Jongo j = new Jongo(db);
MongoCollection collection = j.getCollection("restaurants");
Restaurant r1 = collection.findOne().as(Restaurant.class);
System.out.println(r1);
該代碼輸出
Restaurant: 572eb5df1d739cc73c21f953 / Wendy'S
Cuisine: Hamburgers
Restaurant ID: null
Address: 469 Flatbush Avenue 0, null
Grades: Tue Dec 30 05:00:00 PKT 2014 A / 8
Grades: Tue Jul 01 05:00:00 PKT 2014 B / 23
Grades: Tue Apr 30 05:00:00 PKT 2013 A / 12
Grades: Tue May 08 05:00:00 PKT 2012 A / 12
我似乎無法解決郵政編碼和restaurant_id所獲取的null。
有人請幫忙。 謝謝。
您的字段名稱與文檔名稱不匹配,因此不會被映射。 如果我沒@JsonProperty
話,可以使用@JsonProperty
將這些Java字段名稱映射到您@JsonProperty
mongodb中撤回的文檔名稱。
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