CouchBase C 客戶端介面呼叫例項

宇恆斯發表於2019-05-10
客戶端

由於網上關於純C介面的文章並不多，本人在工作中剛好接觸到，在這裡做一點小分享。
廢話不說，先上下載地址 http://packages.couchbase.com…。

以下是官方程式碼：

#include <libcouchbase/couchbase.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>

static void error_callback(lcb_t instance,
                           lcb_error_t err,
                           const char *errinfo)
{
    fprintf(stderr, "Error %s: %s", lcb_strerror(instance, err),
            errinfo ? errinfo : "");
    exit(EXIT_FAILURE);
}

/* the callback invoked by the library when receiving a get response */
static void get_callback(lcb_t instance,
                         const void *cookie,
                         lcb_error_t error,
                         const lcb_get_resp_t *resp)
{
    if (error != LCB_SUCCESS) {
        fprintf(stderr, "Failed to retrieve "");
        fwrite(resp->v.v0.key, 1, resp->v.v0.nkey, stderr);
        fprintf(stderr, "": %s
", lcb_strerror(instance, error));
    } else {
        fprintf(stderr, "Data for key: "");
        fwrite(resp->v.v0.key, 1, resp->v.v0.nkey, stderr);
        fprintf(stderr, "" is : ");
        fwrite(resp->v.v0.bytes, 1, resp->v.v0.nbytes, stderr);
    }
    (void)cookie; /* ignore */
}

int main(void)
{
    struct lcb_create_st create_options;
    lcb_t instance;
    lcb_error_t err;

    memset(&create_options, 0, sizeof(create_options));
    create_options.v.v0.host = "myserver:8091";
    create_options.v.v0.user = "mybucket";
    create_options.v.v0.passwd = "secret";
    create_options.v.v0.bucket = "mybucket";

    err = lcb_create(&instance, &create_options);
    if (err != LCB_SUCCESS) {
        fprintf(stderr, "Failed to create libcouchbase instance: %s
",
                lcb_strerror(NULL, err));
        return 1;
    }

    /* set up the handler to catch all errors */
    lcb_set_error_callback(instance, error_callback);

    /* initiate the connect sequence in libcouchbase */
    err = lcb_connect(instance);
    if (err != LCB_SUCCESS) {
        fprintf(stderr, "Failed to initiate connect: %s
",
                lcb_strerror(NULL, err));
        return 1;
    }

    /* run the event loop and wait until we`ve connected */
    lcb_wait(instance);

    /* set up a callback for our get requests  */
    lcb_set_get_callback(instance, get_callback);

    {
        lcb_get_cmd_t cmd;
        const lcb_get_cmd_t *commands[1];

        commands[0] = &cmd;
        memset(&cmd, 0, sizeof(cmd));
        cmd.v.v0.key = "foo";
        cmd.v.v0.nkey = 3;

        err = lcb_get(instance, NULL, 1, commands);
        if (err != LCB_SUCCESS) {
            fprintf(stderr, "Failed to get: %s
",
                    lcb_strerror(NULL, err));
            return 1;
        }
    }

    lcb_wait(instance);

    lcb_destroy(instance);
    exit(EXIT_SUCCESS);
}

create_options.v.v0.host = “myserver:8091”;

**請注意以下兩句話，如果按照官方的標準呼叫的話，有可能提示管理員賬號無法訪問資料庫錯誤，註釋後成功訪問!!!**
//create_options.v.v0.user = "mybucket";
//create_options.v.v0.passwd = "secret";
create_options.v.v0.bucket = "mybucket";

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