CODEWITHSUNDEEP
javadictionaryredis
Mayank Jain
Mayank Jain

Reputation: 379

I wanna store multiple map values in single key of Redis in my Java Code

Here Below, I'm having one list of HashMap's and I wanna store all of these map's in single key of redis but I'm not getting any method to store all these maps in single key. Please help me in this problem.

Jedis jedis = new Jedis("localhost");
List <HashMap<String, String>> listOfMaps = new ArrayList<HashMap<String, String>>();
listOfMaps.add(new HashMap<String,String>);
listOfMaps.add(new HashMap<String,String>);
listOfMaps.add(new HashMap<String,String>);
listOfMaps.add(new HashMap<String,String>);
.
.
.
and so on lets take upto 10 values

Now, I wanna store these maps in a key like this:

for(int i=0;i<listOfMaps.size();i++){
   jedis.hmset("mykey",listofMaps[i]);
}

But in his case hmset overwrites all older values to write new values. Please tell me any alternative to store all these map values in single key mykey.

Upvotes: 3

Views: 6250

Answers (2)

Alekya
Alekya

Reputation: 243

You can use something like below

 public static void main(String[] args) {

    Map<String, List<String>> map = new HashMap<String, List<String>>();

    List<String> valSetOne = new ArrayList<String>();
    valSetOne.add("ABC");
    valSetOne.add("BCD");
    valSetOne.add("DEF");

    List<String> valSetTwo = new ArrayList<String>();
    valSetTwo.add("CBA");
    valSetTwo.add("DCB");

    map.put("FirstKey", valSetOne);
    map.put("SecondKey", valSetTwo);

    for (Map.Entry<String, List<String>> entry : map.entrySet()) {

        String key = entry.getKey();

        List<String> values = entry.getValue();

        System.out.println("Value of " + key + " is " + values);

    }

}

Upvotes: 0

Nikita Koksharov
Nikita Koksharov

Reputation: 10793

You can use Multimap object provided by Redisson framework. It allows to store multiple values per map key as list or set. Here is the example:

RMultimap<String, Integer> multimap = redisson.getListMultimap("myMultimap");
for (int i = 0; i < 10; i++) {
    myMultimap.put("someKey", i);
}
// returns Redis list object
RList list = myMultimap.get("someKey");

Upvotes: 2

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