注:在阅读代码时请留意凝视。
2#include <stdlib.h>
3#include <stddef.h>
4#include <stdarg.h>
5#include <string.h>
6#include <assert.h>
7#include <hiredis.h>
8
9void doTest()
10 {
11int timeout = 10000;
12struct timeval tv;
13 tv.tv_sec = timeout / 1000;
14 tv.tv_usec = timeout * 1000;
15//以带有超时的方式链接Redisserver。同一时候获取与Redis连接的上下文对象。
16//该对象将用于其后全部与Redis操作的函数。
17
redisContext* c = redisConnectWithTimeout("192.168.149.137",6379,tv);
18if (c->err) {
19 redisFree(c);
20return;
21 }
22constchar* command1 = "setstest1 value1";
23 redisReply* r =(redisReply*)redisCommand(c,command1);
24//须要注意的是。假设返回的对象是NULL。则表示client和server之间出现严重错误,必须又一次链接。
25//这里仅仅是举例说明,简便起见,后面的命令就不再做这种推断了。
26if (NULL
== r) {
27 redisFree(c);
28return;
29 }
30//不同的Redis命令返回的数据类型不同,在获取之前须要先推断它的实际类型。
31
//至于各种命令的返回值信息,能够參考Redis的官方文档,或者查看该系列博客的前几篇
32
//有关Redis各种数据类型的博客。
33
//字符串类型的set命令的返回值的类型是REDIS_REPLY_STATUS,然后仅仅有当返回信息是"OK"
34//时,才表示该命令运行成功。后面的样例以此类推,就不再过多赘述了。
35if (!(r->type
== REDIS_REPLY_STATUS &&strcasecmp(r->str,"OK") == 0)) {
36 printf("Failedto execute command[%s].\n",command1);
37 freeReplyObject(r);
38 redisFree(c);
39return;
40 }
41//因为后面反复使用该变量。所以须要提前释放,否则内存泄漏。
42
freeReplyObject(r);
43 printf("Succeedto execute command[%s].\n",command1);
44
45constchar* command2 = "strlenstest1";
46 r = (redisReply*)redisCommand(c,command2);
47if (r->type != REDIS_REPLY_INTEGER) {
48 printf("Failedto execute command[%s].\n",command2);
49 freeReplyObject(r);
50 redisFree(c);
51return;
52 }
53int length = r->integer;
54 freeReplyObject(r);
55 printf("Thelength of 'stest1' is %d.\n",length);
56 printf("Succeedto execute command[%s].\n",command2);
57
58constchar* command3 = "getstest1";
59 r = (redisReply*)redisCommand(c,command3);
60if (r->type != REDIS_REPLY_STRING) {
61 printf("Failedto execute command[%s].\n",command3);
62 freeReplyObject(r);
63 redisFree(c);
64return;
65 }
66 printf("Thevalue of 'stest1' is %s.\n",r->str);
67 freeReplyObject(r);
68 printf("Succeedto execute command[%s].\n",command3);
69
70constchar* command4 = "getstest2";
71 r = (redisReply*)redisCommand(c,command4);
72//这里须要先说明一下,因为stest2键并不存在。因此Redis会返回空结果,这里仅仅是为了演示。
73if (r->type
!= REDIS_REPLY_NIL) {
74 printf("Failedto execute command[%s].\n",command4);
75 freeReplyObject(r);
76 redisFree(c);
77return;
78 }
79 freeReplyObject(r);
80 printf("Succeedto execute command[%s].\n",command4);
81
82constchar* command5 = "mgetstest1 stest2";
83 r = (redisReply*)redisCommand(c,command5);
84//不论stest2存在与否,Redis都会给出结果。仅仅是第二个值为nil。
85
//由于有多个值返回,由于返回应答的类型是数组类型。
86if (r->type
!= REDIS_REPLY_ARRAY) {
87 printf("Failedto execute command[%s].\n",command5);
88 freeReplyObject(r);
89 redisFree(c);
90//r->elements表示子元素的数量,无论请求的key是否存在,该值都等于请求是键的数量。
91
assert(2== r->elements);
92return;
93 }
94for (int i = 0; i < r->elements; ++i) {
95 redisReply* childReply =r->element;
96//之前已经介绍过。get命令返回的数据类型是string。
97
//对于不存在key的返回值。其类型为REDIS_REPLY_NIL。
98if (childReply->type
== REDIS_REPLY_STRING)
99 printf("Thevalue is %s.\n",childReply->str);
100 }
101//对于每个子应答。无需使用者单独释放,仅仅需释放最外部的redisReply就可以。
102
freeReplyObject(r);
103 printf("Succeed to executecommand[%s].\n",command5);
104
105 printf("Begin to test pipeline.\n");
106//该命令仅仅是将待发送的命令写入到上下文对象的输出缓冲区中。直到调用后面的
107
//redisGetReply命令才会批量将缓冲区中的命令写出到Redisserver。这样能够
108//有效的降低client与server之间的同步等候时间。以及网络IO引起的延迟。
109
//至于管线的详细性能优势。能够考虑该系列博客中的管线主题。
110if (REDIS_OK!=
redisAppendCommand(c,command1)
111 || REDIS_OK != redisAppendCommand(c,command2)
112 || REDIS_OK != redisAppendCommand(c,command3)
113 || REDIS_OK != redisAppendCommand(c,command4)
114 || REDIS_OK != redisAppendCommand(c,command5)) {
115 redisFree(c);
116return;
117 }
118
119 redisReply* reply = NULL;
120//对pipeline返回结果的处理方式,和前面代码的处理方式全然一直,这里就不再反复给出了。
121if (REDIS_OK!=
redisGetReply(c,(void**)&reply)) {
122 printf("Failed to execute command[%s]with Pipeline.\n",command1);
123 freeReplyObject(reply);
124 redisFree(c);
125 }
126 freeReplyObject(reply);
127 printf("Succeed to execute command[%s]with Pipeline.\n",command1);
128
129if (REDIS_OK!= redisGetReply(c,(void**)&reply)) {
130 printf("Failed to execute command[%s]with Pipeline.\n",command2);
131 freeReplyObject(reply);
132 redisFree(c);
133 }
134 freeReplyObject(reply);
135 printf("Succeed to execute command[%s]with Pipeline.\n",command2);
136
137if (REDIS_OK!= redisGetReply(c,(void**)&reply)) {
138 printf("Failed to execute command[%s]with Pipeline.\n",command3);
139 freeReplyObject(reply);
140 redisFree(c);
141 }
142 freeReplyObject(reply);
143 printf("Succeed to execute command[%s]with Pipeline.\n",command3);
144
145if (REDIS_OK!= redisGetReply(c,(void**)&reply)) {
146 printf("Failed to execute command[%s]with Pipeline.\n",command4);
147 freeReplyObject(reply);
148 redisFree(c);
149 }
150 freeReplyObject(reply);
151 printf("Succeedto execute command[%s] with Pipeline.\n",command4);
152
153if (REDIS_OK!= redisGetReply(c,(void**)&reply)) {
154 printf("Failed to execute command[%s]with Pipeline.\n",command5);
155 freeReplyObject(reply);
156 redisFree(c);
157 }
158 freeReplyObject(reply);
159 printf("Succeed to execute command[%s]with Pipeline.\n",command5);
160//因为全部通过pipeline提交的命令结果均已为返回,假设此时继续调用redisGetReply。
161
//将会导致该函数堵塞并挂起当前线程,直到有新的通过管线提交的命令结果返回。
162
//最后不要忘记在退出前释放当前连接的上下文对象。
163
redisFree(c);
164return;
165 }
166
167int main()
168 {
169 doTest();
170return0;
171 }
172
173//输出结果例如以下:
174//Succeed
to execute command[set stest1value1].
175//The
length of 'stest1' is 6.
176//Succeed
to execute command[strlen stest1].
177//The
value of 'stest1' is value1.
178//Succeed
to execute command[get stest1].
179//Succeed
to execute command[get stest2].
180//The
value is value1.
181//Succeed
to execute command[mget stest1 stest2].
182//Begin
to test pipeline.
183//Succeed
to execute command[set stest1 value1] withPipeline.
184//Succeed
to execute command[strlen stest1] withPipeline.
185//Succeed
to execute command[get stest1] with Pipeline.
186//Succeed
to execute command[get stest2] with Pipeline.
187//Succeed
to execute command[mget stest1 stest2] withPipeline.
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