Linux下C++访问Redis

约定不等于承诺〃 2022-03-18 12:56 288阅读 0赞

### Linux下C++访问Redis ###

*   *  编译redis
     *  例子
     *  gcc编译

## 编译redis ##

开发包的下载和编译在其他文章中已经介绍，不熟悉的可以转至\[Linux下redis环境搭建\]学习。([https://blog.csdn.net/bajianxiaofendui/article/details/87642244][https_blog.csdn.net_bajianxiaofendui_article_details_87642244])  
编译完成后进入redis-2.8.3/deps/hiredis目录，可以看到下面已经编译出了libhiredis.a静态库：  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2JhamlhbnhpYW9mZW5kdWk_size_16_color_FFFFFF_t_70]

## 例子 ##

编写了一个访问redis，进行简单的string读写操作

#include <stdio.h> 
    #include <stdlib.h> 
    #include <stddef.h> 
    #include <stdarg.h> 
    #include <string.h> 
    #include <assert.h> 
    #include <hiredis/hiredis.h> 
       
       
    int main() 
    { 
        redisContext* c = redisConnect("127.0.0.1", 6379); 
        if ( c->err) 
        { 
            redisFree(c); 
            printf("Connect to redisServer faile\n"); 
            return ; 
        } 
        printf("Connect to redisServer Success\n"); 
    
        redisReply *reply = (redisReply *)redisCommand(c, "AUTH %s", "password"); //password为redis服务的密码
        if (reply->type == REDIS_REPLY_ERROR)
        {
            printf("Redis认证失败！\n");
        } 
        else
        {
            printf("Redis认证成功！\n");
        }
        freeReplyObject(reply);
           
        const char* command1 = "set stest1 value1"; 
        redisReply* r = (redisReply*)redisCommand(c, command1); 
           
        if( NULL == r) 
        { 
            printf("Execut command1 failure\n"); 
            redisFree(c); 
            return; 
        } 
        if( !(r->type == REDIS_REPLY_STATUS && strcasecmp(r->str,"OK")==0)) 
        { 
            printf("Failed to execute command[%s]\n",command1); 
            freeReplyObject(r); 
            redisFree(c); 
            return; 
        }    
        freeReplyObject(r); 
        printf("Succeed to execute command[%s]\n", command1); 
           
        const char* command2 = "strlen stest1"; 
        r = (redisReply*)redisCommand(c, command2); 
        if ( r->type != REDIS_REPLY_INTEGER) 
        { 
            printf("Failed to execute command[%s]\n",command2); 
            freeReplyObject(r); 
            redisFree(c); 
            return; 
        } 
        int length =  r->integer; 
        freeReplyObject(r); 
        printf("The length of 'stest1' is %d.\n", length); 
        printf("Succeed to execute command[%s]\n", command2); 
           
           
        const char* command3 = "get stest1"; 
        r = (redisReply*)redisCommand(c, command3); 
        if ( r->type != REDIS_REPLY_STRING) 
        { 
            printf("Failed to execute command[%s]\n",command3); 
            freeReplyObject(r); 
            redisFree(c); 
            return; 
        } 
        printf("The value of 'stest1' is %s\n", r->str); 
        freeReplyObject(r); 
        printf("Succeed to execute command[%s]\n", command3); 
           
        const char* command4 = "get stest2"; 
        r = (redisReply*)redisCommand(c, command4); 
        if ( r->type != REDIS_REPLY_NIL) 
        { 
            printf("Failed to execute command[%s]\n",command4); 
            freeReplyObject(r); 
            redisFree(c); 
            return; 
        } 
        freeReplyObject(r); 
        printf("Succeed to execute command[%s]\n", command4);    
           
           
        redisFree(c); 
        
        return 0; 
    }

在redis-2.8.3同级目录新建一个src目录：  
![在这里插入图片描述][20190220221156800.png]  
将RedisTest.cpp放入src目录，有两种方式：  
1，通过xftp传输  
2，输入命令vim RedisTest.cpp，将代码拷贝进去，再输入:wq!保存退出。

## gcc编译 ##

输入命令开始编译RedisTest.cpp：

g++   RedisTest.cpp -o RedisTest -I../redis-2.8.3/deps  -L../redis-2.8.3/deps/hiredis -lhiredis

g++：表示编译的是c++文件  
RedisTest.cpp：源文件  
RedisTest：输出文件  
\-I…/redis-2.8.3/deps：Include目录为当前目录的上级目录下的redis-2.8.3/deps  
\-L…/redis-2.8.3/deps/hiredis：表示链接库目录为当前目录的上级目录下的redis-2.8.3/deps/hiredis  
\-lhiredis：表示静态库为libhiredis，（分开看：-l是链接，后面的才是库名，二者拼接成libhiredis.o）  
执行上述编译命令，再同级目录下生成RedisTest，输入执行命令：

./RedisTest

运行结果为：  
![在这里插入图片描述][20190220221817820.png]  
上述gcc命令可以用makefile来代替，具体见另一篇博客[makefile通用模板][makefile]

[https_blog.csdn.net_bajianxiaofendui_article_details_87642244]: https://blog.csdn.net/bajianxiaofendui/article/details/87642244
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2JhamlhbnhpYW9mZW5kdWk_size_16_color_FFFFFF_t_70]: /images/20220318/64a62bfb911041779f491bf32db445e6.png
[20190220221156800.png]: /images/20220318/3d9bf8467bac460cb2e65bfef3b85c1b.png
[20190220221817820.png]: /images/20220318/4889b68611e743daa3e9ac3a546e3ea3.png
[makefile]: https://blog.csdn.net/bajianxiaofendui/article/details/87828507