C++ 中使用redis

最新推荐文章于 2025-10-01 20:36:07 发布

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本文介绍如何在C++环境中使用hiredis库连接并操作Redis数据库。包括安装配置步骤、示例代码及常见错误处理方法。

安装好redis后，进入deps目录，执行make intall

则会将hiredis.h等文件 copy到 /usr/local/include/hiredis/

会将 lib文件放入/usr/local/lib/ 中。

在C++中时候用hiredis.h时，只需要

#include <hiredis/hiredis.h> 这样引入即可。

不多说了，上代码 testRedis.cpp ,出处 http://blog.youkuaiyun.com/kingqizhou/article/details/8104693：

#include <stdio.h>
#include <stdlib.h>
#include <hiredis/hiredis.h> 
#include <string>
#include <iostream>
#include <string.h>

void doTest(std::string ip,unsigned int  port)
{
		//redis默认监听端口为6387 可以再配置文件中修改
		redisContext* redis = redisConnect(ip.c_str(), port);

		if ( NULL == redis || redis->err)
		{       // redis为NULL与redis->err是两种不同的错误，若redis->err为true，可使用redis->errstr查看错误信息
				redisFree(redis);
				std::cout << "Connect to redisserver failed" << std::endl;
				return ;
		}	

		std::cout << "Connect to redisserver success" << std::endl;

		const char* command1 = "set stest1 value1";
		redisReply* reply = (redisReply*)redisCommand(redis, command1);    // 执行命令，结果强转成redisReply*类型
		if( NULL == reply)
		{
				printf("Execut command1 failure\n");
				redisFree(redis);     // 命令执行失败，释放内存
				return;
		}
		if( !(reply->type == REDIS_REPLY_STATUS && strcasecmp(reply->str,"OK")==0))
		{       // 判断命令执行的返回值
				printf("Failed to execute command[%s]\n",command1);
				freeReplyObject(reply);
				redisFree(redis);
				return;
		}	
		freeReplyObject(reply);
		printf("Succeed to execute command[%s]\n", command1);
		// 一切正常，则对返回值进行处理v


		const char* command2 = "strlen stest1";
		reply = (redisReply*)redisCommand(redis, command2);    // 执行命令，结果强转成redisReply*类型

		if ( reply->type != REDIS_REPLY_INTEGER) 
		{       // 判断命令执行的返回值
				printf("Failed to execute command[%s]\n",command2);
				freeReplyObject(reply);
				redisFree(redis);
				return;
		}	
		freeReplyObject(reply);
		std::cout << "result of Command strlen test1: " << reply->integer << std::endl;

		const char* command3 = "get stest1";  
		redisReply*	r = (redisReply*)redisCommand(redis, command3);  
		if ( r->type != REDIS_REPLY_STRING)  
		{  
				printf("Failed to execute command[%s]\n",command3);  
				freeReplyObject(r);  
				redisFree(redis);  
				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(redis, command4);  
		if ( r->type != REDIS_REPLY_NIL)  
		{  
				printf("Failed to execute command[%s]\n",command4);  
				freeReplyObject(r);  
				redisFree(redis);  
				return;  
		}  
		printf("The value of 'stest2' is %s\n", r->str);  
		freeReplyObject(r);  
		printf("Succeed to execute command[%s]\n", command4);     


		redisFree(redis);  
}

int main()
{
	std::string ip = "127.0.0.1";
	unsigned int prot = 6379;

	doTest(ip,prot);
}

编译 g++ -o testRedis testRedis.cpp

报错：

testRedis.cpp:(.text+0x1d): undefined reference to `redisConnect'

testRedis.cpp:(.text+0x3a): undefined reference to `redisFree'

testRedis.cpp:(.text+0xa0): undefined reference to `redisCommand'

testRedis.cpp:(.text+0xc0): undefined reference to `redisFree'

testRedis.cpp:(.text+0x104): undefined reference to `freeReplyObject'

testRedis.cpp:(.text+0x10f): undefined reference to `redisFree'

testRedis.cpp:(.text+0x11c): undefined reference to `freeReplyObject'

于是使用了 g++ -lhiredis -o testRedis testRedis.cpp。

编译通过。

运行./testRedis