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working on adding database query to retrieve display data

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This commit is contained in:
Florian Klemenz 2022-05-03 17:00:00 +02:00
parent 3dffca483d
commit 8855ec007b
4 changed files with 49 additions and 4 deletions
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2
.gitignore vendored
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@ -1,3 +1,3 @@
fb_dash
fbdash
*.o
*.swp

8
Makefile
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@ -1,7 +1,11 @@
CFLAGS=-g -Wall -lm
# Prerequisites:
# # sudo apt-get install libmariadb-dev
# # mariadb_config --libs
#
CFLAGS=-g -Wall -lm -L/usr/lib/arm-linux-gnueabihf -lmariadb -I/usr/include/mariadb
fbdash: fbdash.c fblib fbfont
gcc fblib.o fbfont.o -o $@ $(CFLAGS) $<
gcc -o $@ fblib.o fbfont.o $< $(CFLAGS)
fblib: fblib.o
gcc -c fblib.c

BIN
fbdash
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43
fbdash.c
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@ -21,10 +21,13 @@
*/
#include <stdlib.h>
#include <stdio.h>
#include <sys/mman.h>
#include <fcntl.h>
#include <mysql.h>
#include "fblib.h"
#define WIDTH 240
@ -53,16 +56,54 @@ void draw() {
/*
char *text = "Hell O_o!";
render_string(fbp, ubuntu_mono_48, text, 15, 0, 255, 255, 255);
render_string(fbp, ubuntu_mono_24, text, 15, 50, 255, 255, 255);
render_string(fbp, basic_8, text, 15, 100, 255, 255, 255);
*/
}
void finish_with_error(MYSQL *con)
{
fprintf(stderr, "%s\n", mysql_error(con));
mysql_close(con);
exit(1);
}
// application entry point
int main(int argc, char* argv[])
{
printf("MySQL client version: %s\n", mysql_get_client_info());
MYSQL *con = mysql_init(NULL);
if (con == NULL) {
fprintf(stderr, "%s\n", mysql_error(con));
exit(1);
}
if (mysql_real_connect(con, "web-pi", "root", "root_passwd", NULL, 0, NULL, 0) == NULL) {
fprintf(stderr, "%s\n", mysql_error(con));
mysql_close(con);
exit(1);
}
if (mysql_query(con, "SELECT * FROM grafanaData.readings ORDER BY time DESC LIMIT 1")) {
finish_with_error(con);
}
MYSQL_RES *result = mysql_store_result(con);
if (result == NULL) {
finish_with_error(con);
}
int num_fields = mysql_num_fields(result);
MYSQL_ROW row;
while ((row = mysql_fetch_row(result))) {
for(int i = 0; i < num_fields; i++) {
printf("%s ", row[i] ? row[i] : "NULL");
}
printf("\n");
}
mysql_free_result(result);
mysql_close(con);
int fbfd = 0;
long int screensize = 0;