mysql c sample 程序

#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <mysql.h>
#include <sys/time.h>

int main (int argc, char *argv[])
{
if (argc < 2){
printf("a.out sql\n");
}

MYSQL conn;
mysql_init(&conn);

if (! mysql_real_connect(&conn, "192.168.49.189", "admin","admin","obtest", 2880, NULL, 0))
{
printf("Connection failed\n");
return -1;
}

char error_info[1024] = {0};
MYSQL_RES* result = 0;

struct timeval t0,t1,t2;
gettimeofday(&t0, 0);

if (mysql_query(&conn, argv[1])){
strncpy(error_info,mysql_error(&conn),1024);
printf(error_info);
mysql_close(&conn);
return-1;
}

result = mysql_store_result(&conn);
if (result == 0){
strncpy(error_info,mysql_error(&conn),1024);
printf(error_info);
mysql_close(&conn);
return -1;
}

int num_fields = mysql_num_fields(result);
MYSQL_ROW row;
gettimeofday(&t1, 0);

while((row = mysql_fetch_row(result)))
{
unsigned long *lengths = NULL;
int i;
for(i = 0; i < num_fields; i++)
{
printf("%s\t",row[i]?row[i]:"NULL");
}
printf("\n");
}
gettimeofday(&t2, 0);

mysql_free_result(result);
mysql_close(&conn);

long long diff = t1.tv_sec - t0.tv_sec;
diff = diff * 1000000 + (t1.tv_usec - t0.tv_usec);
printf("query takes time %llu\n", diff);
diff = t2.tv_sec - t0.tv_sec;
diff = diff * 1000000 + (t2.tv_usec - t0.tv_usec);

printf("query and output take time %llu\n", diff);
return 0;
}