Now we try to show data of a specific column. For this we get a hk_column object. hk_column represents a specific column of a datasource. To display the data of the actual row use the command mycolumn->asstring(). The hk_datasource::column_by_name method allows you to select a column by it's name.
When you enable a datasource the row selector is in row 0 (the first row). To move the row selector use one of the hk_datasource methods:
bool goto_row (unsigned long r)
bool goto_first (void)
bool goto_last (void)
bool goto_next (void)
bool goto_previous (void)
Example 4.1. Show data of a column
#define HAVE_SSTREAM 1
#include <hk_classes.h>
#include <iostream>
int main()
{
hk_drivermanager* mydrivermanager = new hk_drivermanager();
if (mydrivermanager==NULL) {cout <<"error creating mydrivermanager"<<endl;exit(1);}
hk_connection* myconnection = mydrivermanager->new_connection("mysql");
if (myconnection==NULL) {cout <<"error creating myconnection"<<endl;exit(1);}
myconnection->set_host("localhost");
myconnection->set_user("root");
myconnection->set_password("mypasswd");
myconnection->connect();
hk_database* mydatabase=myconnection->new_database("exampledb");
if (mydatabase==NULL) {cout <<"error creating mydatabase"<<endl;exit(1);}
hk_datasource* mydatasource= mydatabase->new_table("authors");
if (mydatasource==NULL) {cout <<"error creating mydatasource"<<endl;exit(1);}
mydatasource->enable();
hk_column* mycolumn = mydatasource->column_by_name("name");
if (mycolumn==NULL) {cout <<"error getting column"<<endl;exit(1);}
cout <<"Value of the first row: "<<mycolumn->asstring()<<endl;
mydatasource->goto_next();
cout <<"Value of the second row: "<<mycolumn->asstring()<<endl;
delete mydrivermanager;
}