[tcapulusdb knowledge base] [list table] example code for replacing the data at the specified location in the list

【TcaplusDB The knowledge base 】[List surface ] Sample code for replacing location data specified in the list

See Chapter ： preparation .

Sample code

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;
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import java.util.ArrayList;
import java.util.List;
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public class Example {
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    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";
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        // 2.  Create client 
        Client client = ClientFactory.createClient(appId, tableGroupId, appPassword, dirList);
        try {
            // 3.  Request to construct replacement data 
            // 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_LIST_REPLACE_REQ);
            request.setTableName(tableName);
            // 3.3.  because List In the table , Can be more Key Same data , So when you call some interfaces ,
            //       You need to specify the number of data in the replacement data list , In this case 0, Take the first place 1 individual , And so on 
            Record record = request.addRecord(0);
            // 3.4.  Setting list Key Value of field . explain ：Key Field values are not allowed to be updated 
            record.setKeyInt("gameid", 1);
            record.setKeyInt("itemid", 1);
            record.setKeyString("name", "test");
            // 3.5.  Set each Value New value for field 
            record.setValueByte("typeid", (byte) 1);
            record.setValueByte("Data", (byte) 1);
            record.setValueString("uname", "test");
​
            // 4.  Send a request , And get the results 
            Response response = client.poll(request);
​
            // 5.  Processing results 
            if (response.getResult() == 0) {
                //  Replace data successfully 
                // TODO  You can add the subsequent processing code of successful data replacement here 
            } else {
                //  Failed to replace data 
                // TODO  You can add the subsequent processing code of data replacement failure here 
            }
        } finally {
            // 6.  Destroy client objects 
            ClientFactory.destroyClient(client);
        }
    }
​
}

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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 .