We alter now the data of the column. Just give the new value as a parameter to the method hk_column::set_asstring().
Example 5-1. Alter data of a column
1 #include <hk_classes.h>
2 #include <iostream>
3 int main()
4 {
5 hk_drivermanager* mydrivermanager = new hk_drivermanager();
6 if (mydrivermanager==NULL) {cout <<"error creating mydrivermanager"<<endl;exit(1);}
7 hk_connection* myconnection = mydrivermanager->new_connection("mysql");
8 if (myconnection==NULL) {cout <<"error creating myconnection"<<endl;exit(1);}
9 myconnection->set_host("localhost");
10 myconnection->set_user("root");
11 myconnection->set_password("mypasswd");
12 myconnection->connect();
13
14 hk_database* mydatabase=myconnection->new_database("exampledb");
15 if (mydatabase==NULL) {cout <<"error creating mydatabase"<<endl;exit(1);}
16 hk_datasource* mydatasource= mydatabase->new_table("authors");
17 if (mydatasource==NULL) {cout <<"error creating mydatasource"<<endl;exit(1);}
18 mydatasource->enable();
19
20 hk_column* mycolumn = mydatasource->column_by_name("name");
21 if (mycolumn==NULL) {cout <<"error getting column"<<endl;exit(1);}
22 mycolumn->set_asstring("my new data");
23 mydatasource->store_changed_data();
24 delete mydrivermanager;
25 } |
The method mydatasource->store_changed_data(); will store the changes. The data will also be stored when you move the rowselector to another row (hk_datasource::goto_row()) or when you disable the datasource (hk_datasource::disable()).