C language access redis database through Hiredis

C language to access redis database

1. Prepare Hiredis library
   Centos7 or 8
   hiredis-0.11.0.tar.gz
   yum install redis
2. Install the Hiredis library
   Unzip the Hiredis compressed package
   tar -zcvf hiredis-0.11.0.tar.gz
   ./Execute
   make && make install in the Hiredis root directory
3. Edit the dynamic library link
   Create a directory and copy the files to the directory
   mkdir /usr/lib/hiredis
   cp libhiredis.so /usr/lib/hiredis #Dynamic link library libhiredis.so to /usr/lib/hiredis
   mkdir /usr/include/ hiredis
   cp hiredis.h /usr/include/hiredis
   Method 1:
   Add the path /usr/local/lib directly to the file /etc/ld.so.conf. Add directly at the end of the file /etc/ld.so.conf: /usr/local/lib
   Method 2:
   echo'/usr/local/lib' >>/etc/ld.so.conf
   ldconfig
   execute sudo /sbin/ldconfig Next, update the system dynamic library configuration
4. Write the test source code
   test.c and makefile in the same directory, execute make, the test executable file will be generated in the directory
5. Run the test
   ./test
   console to print 1234
   Redis-cli to view the
   makefile file with the foo key value

LIBDIR= -L/usr/local/lib  
LIBSO = -lhiredis  
CFLAG = -Wall -g  
  
all:test

test:test.o
	gcc ${CFLAG} -o $@ $< ${LIBDIR} ${LIBSO}  
%.o%.c:
	gcc -c -o $@ $^  
  
clear:
	rm -f *.o

test.c file source code

#include <stdio.h>  
#include <hiredis/hiredis.h>  
  
int main()  
{
    
      
    redisContext* conn = redisConnect("127.0.0.1",6379);  
    if(conn->err)   printf("connection error:%s\n",conn->errstr);  
  
    redisReply* reply = redisCommand(conn,"set foo 1234");  
    freeReplyObject(reply);  
  
    reply = redisCommand(conn,"get foo");  
  
    printf("%s\n",reply->str);  
    freeReplyObject(reply);  
  
    redisFree(conn);  
  
    return 0;  
  
}

Note: Dynamic library citation is the key, detailed source code can be obtained by contacting the blogger