redis_account

编译步骤：

1. 安装hiredis

下载hiredis源码

解压源码

unzip hiredis-0.14.0

进入源码目录

cd hiredis-0.14.0

安装hiredis

make install

2. 编译代码

命令行编译

gcc account.c -o account -L /usr/local/lib -lhiredis

或者使用Makefile编译

make build

接口介绍

• 函数原型：redisContext *redisConnect(const char *ip, int port); 说明：该函数用来连接redis数据库，参数为数据库的ip地址和端口，通常默认端口为6379。该函数返回一个redisContext对象。

• 函数原型：void *redisCommand(redisContext *c, const char *format, …); 说明：该函数执行redis命令，当然也包括由lua脚本组成的命令，返回redisReply对象。

• 函数原型void freeReplyObject(void *reply); 说明：释放redisCommand执行后返回的redisReply所占用的内存。

• 函数原型：void redisFree(redisContext *c); 说明：释放redisConnect()所产生的连接。

redisReply对象

/* This is the reply object returned by redisCommand() */
 typedef struct redisReply {
     int type; /* 返回结果类型* */
     long long integer; /* 返回类型为整型的时候的返回值 */
     size_t len; /* 字符串长度 */
     char *str; /* 返回错误类型或者字符类型的字符串 */
     size_t elements; /* 返回数组类型时，元素的数量*/
     struct redisReply **element; /* 元素结果集合，redisReply对象 */
 } redisReply;

源码：

#include <stdio.h>
#include </usr/local/include/hiredis/hiredis.h>//绝对路径
#include <time.h>
#define CMD_MAXLENGTH 256
#define REDIS_SERVER_IP "127.0.0.1"//ip地址
#define REDIS_SERVER_PORT 6379//端口号


typedef struct Payment{//入账数据结构
    char use[64];
    unsigned cost;
}Payment;

typedef enum returnState{//返回状态
    SUCCESS = 0,
    ERROR = 1
}returnState;

returnState addPayment(struct Payment *payment);//添加入账
returnState exeRedisCommand(char *cmd);//执行redis命令
returnState queryPayByDate(unsigned date);//通过date查找
unsigned account_time();//入账时间


returnState addPayment(struct Payment *payment)//可改进存储结构，不一定用lpush
{
    unsigned date = account_time();
    char cmd[CMD_MAXLENGTH] = {0};
    if(payment == NULL)
        return ERROR;
    else{
        snprintf(cmd,CMD_MAXLENGTH,"lpush date:%ud %s:%ud",date,payment->use,payment->cost);
    }

    if(exeRedisCommand(cmd) == ERROR)
    {
        printf("add payment error\n");
        return ERROR;
    }
    printf("add payment success\n");
    return SUCCESS;

}

returnState exeRedisCommand(char *cmd){
    if(cmd == NULL)
        return ERROR;
    redisContext *context = redisConnect(REDIS_SERVER_IP,REDIS_SERVER_PORT);
    if(context->err) {
        printf("connect redis server error:%s\n",context->errstr);
        redisFree(context);
        return ERROR;
    }
    printf("connect redis server success\n");
    redisReply *reply = (redisReply *)redisCommand(context,cmd);
    if(reply == NULL)
    {
        printf("execute command:%s error\n",cmd);
        return ERROR;
    }
    //返回执行结果为整型的命令,只有状态为REDIS_REPLY_INTEGER,并且INTEGER是大于0时,才表示这种类型的命令执行成功
    if(!(reply->type == REDIS_REPLY_INTEGER && reply->integer > 0)){
        printf("execute command:%s error\n", cmd);
        freeReplyObject(reply);
        redisFree(context);
        return ERROR;
    }
    freeReplyObject(reply);
    redisFree(context);
    printf("execute command:%s success\n",cmd);
    return SUCCESS;

}
returnState queryPayByDate(unsigned date)
{

    char cmd[CMD_MAXLENGTH];
    if(date<0&&date>31)
    {
        printf("date input error\n");
        return ERROR;
    }
    /*组装执行命令*/
    snprintf(cmd,CMD_MAXLENGTH,"lrange %ud 0 -1",date);
    if(exeRedisCommand(cmd) == ERROR)
    {
        printf("query payment error");
        return ERROR;
    }
    return SUCCESS;
}

unsigned account_time(){
    unsigned date;
    time_t timep;
    struct tm *p;
    time (&timep);
    p=gmtime(&timep);
    date = p->tm_mday;
    return date;
}


int main(){
    int mark,date;
    Payment payment;
    printf("enter number to select function\n1.存入账本\n2.查找账本");
    scanf("%d",&mark);
    switch (mark){
        case 1:
            scanf("%s%ud",payment.use,&payment.cost);
            addPayment(&payment);
            return 0;
        case 2:
            scanf("%d",&date);
            queryPayByDate(date);
            return 0;
    }
}

r

参考：

C语言操作redis数据库
Redis C 语言客户端 hiredis 的使用
hiredis官网
Makefile由浅入深--教程、干货
git学习--GitHub上如何进行PR(Pull Request)操作