redis C接口hiredis 簡單函數使用介紹
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from : http://blog.csdn.net/kingqizhou/article/details/8104693
hiredis是redis數據庫的C接口,目前只能在linux下使用,幾個基本的函數就可以操作redis數據庫了。
函數原型:redisContext *redisConnect(const char *ip, int port)
說明:該函數用來連接redis數據庫,參數為數據庫的ip地址和端口,一般redis數據庫的端口為6379
該函數返回一個結構體redisContext。
函數原型:void *redisCommand(redisContext *c, const char *format, ...);
說明:該函數執行命令,就如sql數據庫中的SQL語句一樣,只是執行的是redis數據庫中的操作命令,第一個參數為連接數據庫時返回的redisContext,剩下的參數為變參,就如C標準函數printf函數一樣的變參。返回值為void*,一般強制轉換成為redisReply類型的進行進一步的處理。
函數原型void freeReplyObject(void *reply);
說明:釋放redisCommand執行後返回的redisReply所占用的內存
函數原型:void redisFree(redisContext *c);
說明:釋放redisConnect()所產生的連接。
下面用一個簡單的例子說明:
[cpp] view plaincopy
- #include <stdio.h>
- #include <stdlib.h>
- #include <stddef.h>
-
#include <stdarg.h>
- #include <string.h>
- #include <assert.h>
- #include <hiredis/hiredis.h>
- void doTest()
- {
- //redis默認監聽端口為6387 可以再配置文件中修改
- 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");
- 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);
- }
- int main()
- {
- doTest();
- return 0;
- }
執行結果為:
再分享一下我老師大神的人工智能教程吧。零基礎!通俗易懂!風趣幽默!還帶黃段子!希望你也加入到我們人工智能的隊伍中來!http://www.captainbed.net
redis C接口hiredis 簡單函數使用介紹