redis学习（十二）——hiredis的使用

1）启动redis

# 启动redis服务---redis默认端口6379
redis-server redis.conf

2）测试redis连通性

# 连接6379端口,set和get分别设置和获取键值
[root@192 /usr/local/bin]$redis-cli -p 6379
127.0.0.1:6379> set ttt 123
OK
127.0.0.1:6379> get ttt
"123"
127.0.0.1:6379> keys *
1) "ttt"

3）hiredis下载和安装

hiredis下载地址：https://github.com/redis/hiredis

# 下载安装包并解压
unzip hiredis-master.zip

# 编译、安装
cd hiredis-master
make
make install

4）查看hiredis是否安装成功

# 进入/usr/local/lib下查看是否有hiredis相关库
libhiredis.a
libhiredis.so
libhiredis.so.1.1.1-dev

# 进入/usr/local/include下查看是否有相应头文件
[root@192 hiredis]# ls
adapters  alloc.h  async.h  hiredis.h  read.h  sds.h  sockcompat.h
[root@192 hiredis]# pwd
/usr/local/include/hiredis

5）测试

a）创建测试文件my_hiredis.c

touch my_hiredis.c

b）编写测试程序

vim my_hiredis.c

c）测试代码

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

int main()
{
  // 1. 连接redis数据库
  redisContext *ctx = redisConnect("127.0.0.1", 6379);
  if (ctx->err)
  {
    redisFree(ctx);
    printf("Connect redis server err: %s\n", ctx->errstr);
    return -1;
  }

  printf("Connect redis server success...\n");

  // 2. redis操作命令: 设置值
  const char *cmdSetVal = "SET dong 10";
  redisReply *reply = (redisReply *)redisCommand(ctx, cmdSetVal);
  if (NULL == reply)
  {
    printf("Command[ %s ] exec failed!\n", cmdSetVal);
    redisFree(ctx);
    return -1;
  }

  // 3. redis返回值判断
  if (!(reply->type == REDIS_REPLY_STATUS && strcmp(reply->str, "OK") == 0))
  {
    printf("Command[ %s ] exec failed!\n", cmdSetVal);
    freeReplyObject(reply);
    redisFree(ctx);
    return -1;
  }

  // 4. 内存释放
  freeReplyObject(reply);
  printf("Command[ %s ] exec success...\n", cmdSetVal);

  // 5. redis操作命令: 获取值
  const char *cmdGetVal = "GET test";
  reply = (redisReply *)redisCommand(ctx, cmdGetVal);

  // 6. redis返回值判断
  if (reply->type != REDIS_REPLY_STRING)
  {
    printf("Command[ %s ] exec failed!\n", cmdGetVal);
    freeReplyObject(reply);
    redisFree(ctx);
    return -1;
  }

  printf("GET dong: %s\n", reply->str);
  freeReplyObject(reply);
  redisFree(ctx);
}

d）编译运行

# 编译
gcc my_hiredis.c -o my_hiredis -lhiredis

# 运行
[root@192 project]# ./my_hiredis 
Connect redis server success...
Command[ SET dong 10 ] exec success...
GET test: 10
[root@192 project]#