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Deleting Data

Last updated: 2024-12-04 10:16:20

    Prerequisites

    You have created a cluster, a table group and the PLAYERONLINECNT table.
    The description file table_test.xml of the PLAYERONLINECNT table is as follows:
    <?xml version="1.0" encoding="GBK" standalone="yes" ?>
    <metalib name="tcaplus_tb" tagsetversion="1" version="1">
    <struct name="PLAYERONLINECNT" version="1" primarykey="TimeStamp,GameSvrID" splittablekey="TimeStamp">
    <entry name="TimeStamp" type="uint32" desc="Measured in minutes" />
    <entry name="GameSvrID" type="string" size="64" />
    <entry name="GameAppID" type="string" size="64" desc="gameapp id" />
    <entry name="OnlineCntIOS" type="uint32" defaultvalue="0" desc="The number of iOS online users" />
    <entry name="OnlineCntAndroid" type="uint32" defaultvalue="0" desc="The number of Android online users" />
    <entry name="BinaryLen" type="smalluint" defaultvalue="1" desc="Data length of the data source; skip the source check when the length is 0."/>
    <entry name="binary" type="tinyint" desc="Binary" count= "1000" refer="BinaryLen" />
    <entry name="binary2" type="tinyint" desc="Binary 2" count= "1000" refer="BinaryLen" />
    <entry name="strstr" type="string" size="64" desc="String"/>
    <index name="index_id" column="TimeStamp"/>
    </struct>
    </metalib>

    Step 1: Define configuration parameters

    // Access address of the target cluster
    static const char DIR_URL_ARRAY[][TCAPLUS_MAX_STRING_LENGTH] =
    {
    "tcp://10.191.***.99:9999",
    "tcp://10.191.***.88:9999"
    };
    // The number of target cluster addresses
    static const int32_t DIR_URL_COUNT = 2;
    // Cluster ID of the target business
    static const int32_t APP_ID = 3;
    // Table group ID of the target business
    static const int32_t ZONE_ID = 1;
    // Target business password
    static const char * SIGNATURE = "*******";
    // Table name "PLAYERONLINECNT" of the target business
    static const char * TABLE_NAME = "PLAYERONLINECNT";

    Step 2: Initialize TcaplusAPI log handles

    Log configuration file: tlogconf.xml
    // TCaplus service log class
    TcaplusService::TLogger* g_pstTlogger;
    LPTLOGCATEGORYINST g_pstLogHandler;
    LPTLOGCTX g_pstLogCtx;
    int32_t InitLog()
    {
    // Absolute path of the log configuration file
    const char* sLogConfFile = "tlogconf.xml";
    // Log class name
    const char* sCategoryName = "mytest";
    // Initialize the log handle using the configuration file
    g_pstLogCtx = tlog_init_from_file(sLogConfFile);
    if (NULL == g_pstLogCtx)
    {
    fprintf(stderr, "tlog_init_from_file failed.\\n");
    return -1;
    }
    // Get the log class
    g_pstLogHandler = tlog_get_category(g_pstLogCtx, sCategoryName);
    if (NULL == g_pstLogHandler)
    {
    fprintf(stderr, "tlog_get_category(mytest) failed.\\n");
    return -2;
    }
    // Initialize the log handle
    g_pstTlogger = new TcaplusService::TLogger(g_pstLogHandler);
    if (NULL == g_pstTlogger)
    {
    fprintf(stderr, "TcaplusService::TLogger failed.\\n");
    return -3;
    }
    
    return 0;
    }

    Step 3: Initialize TcaplusAPI client

    // The client main class of the TCaplus service API
    TcaplusService::TcaplusServer g_stTcapSvr;
    // Meta information for the table
    extern unsigned char g_szMetalib_tcaplus_tb[];
    LPTDRMETA g_szTableMeta = NULL;
    int32_t InitServiceAPI()
    {
    // Initialize
    int32_t iRet = g_stTcapSvr.Init(g_pstTlogger, /*module_id*/0, /*app id*/APP_ID, /*zone id*/ZONE_ID, /*signature*/SIGNATURE);
    if (0 != iRet)
    {
    tlog_error(g_pstLogHandler, 0, 0, "g_stTcapSvr.Init failed, iRet: %d.", iRet);
    return iRet;
    }
    
    // Add the directory server
    for (int32_t i = 0; i< DIR_URL_COUNT; i++)
    {
    iRet = g_stTcapSvr.AddDirServerAddress(DIR_URL_ARRAY[i]);
    if (0 != iRet)
    {
    tlog_error(g_pstLogHandler, 0, 0, "g_stTcapSvr.AddDirServerAddress(%s) failed, iRet: %d.", DIR_URL_ARRAY[i], iRet);
    return iRet;
    }
    }
    
    // Get the meta description of the table
    g_szTableMeta = tdr_get_meta_by_name((LPTDRMETALIB)g_szMetalib_tcaplus_tb, TABLE_NAME);
    if(NULL == g_szTableMeta)
    {
    tlog_error(g_pstLogHandler, 0, 0,"tdr_get_meta_by_name(%s) failed.", TABLE_NAME);
    return -1;
    }
    
    // Register the data table (connect to the directory server, verify the password, and get the table routing) with 10-second timeout period
    iRet = g_stTcapSvr.RegistTable(TABLE_NAME, g_szTableMeta, /*timeout_ms*/10000);
    if(0 != iRet)
    {
    tlog_error(g_pstLogHandler, 0, 0, "g_stTcapSvr.RegistTable(%s) failed, iRet: %d.", TABLE_NAME, iRet);
    return iRet;
    }
    
    // Connect to all TcaplusDB proxy servers corresponding to the table
    iRet = g_stTcapSvr.ConnectAll(/*timeout_ms*/10000, 0);
    if(0 != iRet)
    {
    tlog_error(g_pstLogHandler, 0, 0, "g_stTcapSvr.ConnectAll failed, iRet: %d.", iRet);
    return iRet;
    }
    
    return 0;
    }

    Step 4. Send a delete request via the API

    int32_t SendDeleteRequest()
    {
    // Request object class
    TcaplusService::TcaplusServiceRequest* pstRequest = g_stTcapSvr.GetRequest(TABLE_NAME);
    if (NULL == pstRequest)
    {
    tlog_error(g_pstLogHandler, 0, 0, "g_stTcapSvr.GetRequest(%s) failed.", TABLE_NAME);
    return -1;
    }
    
    // Initialize the request object
    int iRet = pstRequest->Init(TCAPLUS_API_DELETE_REQ, NULL, 0, 0, 0, 0);
    if(0 != iRet)
    {
    tlog_error(g_pstLogHandler, 0, 0, "pstRequest->Init(TCAPLUS_API_DELETE_REQ) failed, iRet: %d.", iRet);
    return iRet;
    }
    
    // Add a record to the table according to the request
    TcaplusService::TcaplusServiceRecord* pstRecord = pstRequest->AddRecord();
    if (NULL == pstRecord)
    {
    tlog_error(g_pstLogHandler, 0, 0, "pstRequest->AddRecord() failed.");
    return -1;
    }
    
    PLAYERONLINECNT stPLAYERONLINECNT;
    memset(&stPLAYERONLINECNT, 0, sizeof(stPLAYERONLINECNT));
    
    // Specify the information of the key to be deleted
    stPLAYERONLINECNT.dwTimeStamp = 1;
    snprintf(stPLAYERONLINECNT.szGameSvrID, sizeof(stPLAYERONLINECNT.szGameSvrID), "%s", "mysvrid");
    
    
    // Set the record based on the TDR description
    iRet = pstRecord->SetData(&stPLAYERONLINECNT, sizeof(stPLAYERONLINECNT));
    if(0 != iRet)
    {
    tlog_error(g_pstLogHandler, 0, 0, "pstRecord->SetData() failed, iRet: %d.", iRet);
    return iRet;
    }
    
    // Send the request packet
    iRet= g_stTcapSvr.SendRequest(pstRequest);
    if(0 != iRet)
    {
    tlog_error(g_pstLogHandler, 0, 0, "g_stTcapSvr.SendRequest failed, iRet: %d.", iRet);
    return iRet;
    }
    return 0;
    }

    Step 5. Receive the response via the API

    int RecvResp(TcaplusServiceResponse*& response)
    {
    // Block the reception of response packets 5,000 times with each block lasting for 1 ms
    unsigned int sleep_us = 1000;
    unsigned int sleep_count = 5000;
    do
    {
    usleep(sleep_us);
    response = NULL;
    int ret = g_stTcapSvr.RecvResponse(response);
    if (ret < 0)
    {
    tlog_error(g_pstLogHandler, 0, 0, "tcaplus_server.RecvResponse failed. ret:%d", ret);
    return ret;
    }
    
    // Receive a response packet
    if (1 == ret)
    {
    break;
    }
    } while ((--sleep_count) > 0);
    
    // Timeout period: 5 seconds
    if (0 == sleep_count)
    {
    tlog_error(g_pstLogHandler, 0, 0, "tcaplus_server.RecvResponse wait timeout.");
    return -1;
    }
    return 0;
    }

    Samples

    Please refer to main.cpp.
    int main(void) {
    // Initialize the log
    int ret = InitLog();
    if ( ret != 0)
    {
    printf("init log failed\\n");
    return -1;
    }
    
    // Initialize the API client
    ret = InitServiceAPI();
    if ( ret != 0)
    {
    printf("init InitServiceAPI failed\\n");
    return -1;
    }
    
    // Send the request
    ret = SendDeleteRequest();
    if (0 != ret)
    {
    printf("SendDeleteRequest failed\\n");
    return -1;
    }
    
    // Receive the response
    TcaplusServiceResponse* response = NULL;
    ret = RecvResp(response);
    if (0 != ret)
    {
    printf("RecvResp failed\\n");
    return -1;
    }
    
    // Get the result, where "0" indicates success
    int32_t result = response->GetResult();
    if (0 != result)
    {
    printf("the result is %d\\n", result);
    return -1;
    }
    
    return 0;
    }
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