MySQL: Insert values to column using C - mysql

Question

I have put the value coming out of the the packet[i] from the for loops in variables d,e f,j. but when I am trying to put the values of these variables in a column of mysql I get an error
Unknown column 'd' in 'field list'
My code:
printf("\nResponse Code: ");
for(i = 54; i<=56; i++)
{
d = packet[i];
printf("%c", packet[i]);
}
printf("\nCommand: ");
for(i = 54; i<=57; i++)
{
e = packet[i];
printf("%c", packet[i]);
}
printf("\nResponse Parameter: ");
for(i = 58; i<=104; i++)
{
f = packet[i];
printf("%c", packet[i]);
}
printf("\nTime to live:");
j = packet[22];
printf("%c", packet[i]);
if (mysql_query(con, "CREATE TABLE SMTP(Response_Code CHAR(250) , Command CHAR(250), Response_Parameter CHAR(250), Time_to_live CHAR(250))")) {
finish_with_error(con);
}
printf("here");
if (mysql_query(con, "INSERT INTO SMTP VALUES(d,e,f,j)")) {
finish_with_error(con);
}
I want the values of d e f and j to be printed in these columns but I am getting error Unknown column 'd' in 'field list'

Answer 1

You can use snprintf or sprintf to form the query, before to that extract the complete data instead of single char from the packet.
char d[100], e[100], f[100];
printf("\nResponse Code: ");
for(i = 54; i<=56; i++)
{
d[i-54] = packet[i]; //Copy the individual char
printf("%c", packet[i]);
}
d[i-54] = '\0'; //null terminate the array
printf("\nCommand: ");
for(i = 54; i<=57; i++)
{
e[i-54] = packet[i];
printf("%c", packet[i]);
}
e[i-54] = '\0';
printf("\nResponse Parameter: ");
for(i = 58; i<=104; i++)
{
f[i-58] = packet[i];
printf("%c", packet[i]);
}
f[i-58] = '\0';
//do the same for even "Time to live"
Then form the prepared statement and execute it,
char query[300];
sprintf(query, "INSERT INTO SMTP VALUES (?,?,?)");
MYSQL_STMT *stmt;
MYSQL_BIND bind[3];
stmt = mysql_stmt_init(con);
if (!stmt)
{
return;//error
}
if (mysql_stmt_prepare(con, query, strlen(query)))
{
return;//error
}
int dLen = strlen(d);
bind[0].buffer_type= MYSQL_TYPE_STRING;
bind[0].buffer= (char *)d;
bind[0].buffer_length= STRING_SIZE;
bind[0].is_null= 0;
bind[0].length= &dLen;
int eLen = strlen(e);
bind[1].buffer_type= MYSQL_TYPE_STRING;
bind[1].buffer= (char *)e;
bind[1].buffer_length= STRING_SIZE;
bind[1].is_null= 0;
bind[1].length= &eLen ;
int fLen = strlen(f);
bind[2].buffer_type= MYSQL_TYPE_STRING;
bind[2].buffer= (char *)f;
bind[2].buffer_length= STRING_SIZE;
bind[2].is_null= 0;
bind[2].length= &fLen;
/* Execute the INSERT statement - 1*/
if (mysql_stmt_execute(stmt))
{
return; //error
}
mysql_stmt_close(stmt