Question

In the following code for retrieving data via a SQL query from the db, is there a way I can replace row[0] with fieldname. I am only enclosing the relevant part of the code

MYSQL_RES *resptr;
MYSQL_ROW row;

while ( ( row = mysql_fetch_row(resptr)) != NULL ) 
{
for (int i=0;i<8;i++)
string key = row[0];
 }  

row[0] is the trans_date column. the code works fine as it is right now, but is there a way to assign key by using the fieldname vs. having to remember all the field numbers.
thanks!

Answer 1

You can retrieve field names by doing

field = mysql_fetch_field(resptr);
std::cout << field->name;

(Put in a while loop to loop through all field)

But you can’t call row[fieldName]. What you can do though is define variables to map column names and numbers

int id = 0;
int trans_date = 1;
// Code happening here
std::cout << row[id] << " " << row[trans_date];

UPDATE: You could always do something like this (using STL’s map):

map<string, int> columns;
int i = 0;
while(field = mysql_fetch_field(resptr)){
  columns.insert(pair<string,int>(field->name, i++));
}

And then use row[columns["name"]];.