将现有maprdb迁移到mongodb。应用程序中使用的springboot hadoop和maprdb
“我的应用程序使用了springboot hadoop和maprdb。我以前从未使用过springhadoop和maprdb。请导游。我想删除maprdb代码并连接到mangodb将现有maprdb迁移到mongodb。应用程序中使用的springboot hadoop和maprdb,mongodb,hadoop,migrate,open-json,Mongodb,Hadoop,Migrate,Open Json,“我的应用程序使用了springboot hadoop和maprdb。我以前从未使用过springhadoop和maprdb。请导游。我想删除maprdb代码并连接到mangodb my code is like this ' public static List<> getData(String a){ List<> DataList = new ArrayList<>(); Connection connection = DriverManager.ge
my code is like this '
public static List<> getData(String a){
List<> DataList = new ArrayList<>();
Connection connection = DriverManager.getConnection("ojai:mapr:");
try
{
DoctumentStore store = connection.getstore(table);
Query query = connection.newQuery().where(connection.newCondition()
.matched("_id", code+"*"),build()).build();
DoctumentStream stream = store.find(query);
for(Document Doc : stream){
ObjectMapper objectmapper = ObjectMapper();
DataList.add(objectMapper.readValue(Doc.asJsonString(),abc.class));
}
store.close();
}
catch(Exception e){
e.printStackTrace();
connection.close();
}
connection.close();
return DataList;
}
}
我的代码是这样的'
公共静态列表getData(字符串a){
List DataList=new ArrayList();
Connection Connection=DriverManager.getConnection(“ojai:mapr:”);
尝试
{
DoctumentStore=connection.getstore(表);
Query Query=connection.newQuery().where(connection.newCondition())
.matched(“_id”,code+“*”),build()).build();
DoctumentStream=store.find(查询);
用于(文档文档:流){
ObjectMapper ObjectMapper=ObjectMapper();
add(objectMapper.readValue(Doc.asJsonString(),abc.class));
}
store.close();
}
捕获(例外e){
e、 printStackTrace();
connection.close();
}
connection.close();
返回数据列表;
}
}