C++用hiredis访问redis

C++用hiredis访问redis 常用函数应用例子

常用函数

1）redisContext* redisConnect(const char *ip, int port) 用于建立与Redis数据库的连接。

2）void redisFree(redisContext *c) 用于释放与Redis数据库的连接。

3）redisReply* redisCommand(redisContext *c, const char *cmd) 用于发送命令到Redis服务器并等待服务器响应。

4）redisReply* redisCommandArgv(redisContext *c, int argc, const char **argv, const size_t *argvlen) 用于发送带有参数的命令到Redis服务器并等待服务器响应。

5）void freeReplyObject(redisReply r) 用于释放Redis服务器的响应结果。

6）redisReply* redisGetReply(redisContext *c, void **replyValue) 用于从Redis服务器获取单个响应结果。

7）redisReply* redisGetReplyFromReader(redisContext *c) 用于从Redis读取器中获取下一个响应结果。

8）int redisGetReplyStatus(redisContext *c, const redisReply *r) 用于获取Redis响应的状态码。

9）const char* redisGetReplyString(redisContext *c, const redisReply *r) 用于获取Redis响应的字符串值。

10）int redisGetReplyInt(redisContext *c, const redisReply *r) 用于获取Redis响应的整数值。

11）double redisGetReplyDouble(redisContext *c, const redisReply *r) 用于获取Redis响应的浮点数值。

12）void* redisGetReplyData(redisContext *c, const redisReply *r, size_t *len) 用于获取Redis响应的数据和数据长度。

应用例子 #include <iostream> #include <hiredis/hiredis.h> int main() { // 创建连接 redisContext *c = redisConnect("127.0.0.1", 6379); if (c == NULL || c->err) { std::cout << "Connection error: " << c->errstr << std::endl; return 1; } // 设置数据库名称 const char *dbName = "mydb"; // 创建数据库 if (redisDbCreate(c, dbName) != REDIS_OK) { std::cout << "Failed to create database: " << c->errstr << std::endl; return 1; } // 增加数据 const char *key = "key1"; const char *value = "value1"; if (redisDbKeySet(c, dbName, key, value) != REDIS_OK) { std::cout << "Failed to set key-value pair: " << c->errstr << std::endl; return 1; } // 获取数据 redisReply *reply = redisDbKeyGet(c, dbName, key); if (reply == NULL) { std::cout << "Failed to get key-value pair: " << c->errstr << std::endl; return 1; } std::cout << "Value for key '" << key << "': " << reply->str << std::endl; freeReplyObject(reply); // 删除数据 if (redisDbKeyDel(c, dbName, key) != REDIS_OK) { std::cout << "Failed to delete key-value pair: " << c->errstr << std::endl; return 1; } // 修改数据 const char *new_value = "value2"; if (redisDbKeySet(c, dbName, key, new_value) != REDIS_OK) { std::cout << "Failed to set key-value pair: " << c->errstr << std::endl; return 1; } // 查询数据 reply = redisDbKeysGet(c, dbName, NULL, 0); if (reply == NULL || reply->type == REDIS_REPLY_NIL) { std::cout << "No keys found in database." << std::endl; freeReplyObject(reply); } else { std::cout << "Found keys in database:" << std::endl; while (reply != NULL && reply->type != REDIS_REPLY_NIL) { std::cout << reply->str << std::endl; freeReplyObject(reply); reply = reply->next; } } // 关闭连接 redisFree(c); return 0; }