Preparation of this paper

See Chapter ： preparation .

Sample code

Be careful ： By part Key Before the field value reads the data , First create a key with the corresponding key value as Key The index of , Otherwise, an error will be reported that the index cannot be found . Reference resources Define index .

Sample code

import com.tencent.tcaplus.client.Client;
import com.tencent.tcaplus.client.ClientFactory;
import com.tencent.tcaplus.client.Record;
import com.tencent.tcaplus.client.Request;
import com.tencent.tcaplus.client.Response;
import com.tencent.tdr.tcaplus_protocol_cs.TcaplusProtocolCsConstants;
​
import java.util.ArrayList;
import java.util.List;
​
public class Example {
​
    public static void main(String[] arguments) {
        // 1.  Prepare environmental information 
        // 1.1.  Directory service address list 
        List<String> dirList = new ArrayList<String>();
        dirList.add("tcp://x.x.x.x:9999");
        dirList.add("tcp://y.y.y.y:9999");
        // 1.2.  Business ID
        int appId = 1;
        // 1.3.  Business password 
        String appPassword = "****************";
        // 1.4.  Table group ID
        int tableGroupId = 1;
        // 1.5.  Table name 
        String tableName = "test";
​
        // 2.  Create client 
        Client client = ClientFactory.createClient(appId, tableGroupId, appPassword, dirList);
        try {
            // 3.  The structure is based on part Key A request to read data from a field value 
            // 3.1.  Get request object . In order to improve SDK performance ,Request Objects are reusable 
            Request request = client.acquireRequest();
            // 3.2.  Set request type and target table name 
            request.setCmd(TcaplusProtocolCsConstants.TCAPLUS_CMD_GET_BY_PRRTKEY_RES);
            request.setTableName(tableName);
            // 3.3.  Settings section Key Value of field . Complete in this example Key from 3 Fields make up , But only one of the fields is specified when querying 
            Record record = request.addRecord();
            record.setKeyInt("gameid", 1);
            // 3.4.  Add the data to be read Value Field 
            request.addFieldName("typeid");
            request.addFieldName("Data");
            request.addFieldName("uname");
            // 3.5.  Set to return only results from the list offset At the beginning number Data , If it is not set, all qualified data will be returned 
            int offset = 0;
            int number = 100;
            request.setPartkeyGetParam(offset, number);
​
            // 4.  Send a request , And get the results 
            Response response = client.poll(request);
​
            // 5.  Processing results 
            if (response.getResult() == 0) {
                //  Read data successfully 
                Record result;
                while ((result = response.fetchRecord()) != null) {
                    // TODO  The subsequent processing code of successful data reading can be added here 
                }
            } else {
                //  Failed to read data 
                // TODO  The subsequent processing code of data reading failure can be added here 
            }
        } finally {
            // 6.  Destroy client objects 
            ClientFactory.destroyClient(client);
        }
    }
​
}

TcaplusDB It's a distributed product of Tencent NoSQL database , The code for storage and scheduling is completely self-developed . With cache + Landing fusion architecture 、PB Levels of storage 、 Millisecond delay 、 Lossless horizontal expansion and complex data structure . At the same time, it has rich ecological environment 、 Easy migration 、 Extremely low operation and maintenance costs and five nine high availability features . Customer coverage game 、 Internet 、 government affairs 、 Finance 、 Manufacturing and the Internet of things .