Below you see the program of chapter 1 with some additional commands. A hk_database object represents a database, the name of the database can be set either with the constructor or with "set_name(const string&)".
A table or a query is be represented by a hk_datasource object (a query with a "SELECT statement is called in hk_classes a resultquery and can be created with hk_datasource* mydatasource=mydatabase->new_resultquery(); ).
Before you can see the data of a datasource you have to enable it (then the SQL-statement will be executed). The last command ("dump_data()") is just added so that you can see the data, please don't use it in your code.
Example 2-1. Get in contact with a table
1
2 #include <hk_classes.h>
3 #include <iostream>
4 int main()
5 {
6 hk_drivermanager* mydrivermanager = new hk_drivermanager();
7 if (mydrivermanager==NULL) {cout <<"error creating mydrivermanager"<<endl;exit(1);}
8 hk_connection* myconnection = mydrivermanager->new_connection();
9 if (myconnection==NULL) {cout <<"error creating myconnection"<<endl;exit(1);}
10 myconnection->connect();
11
12 hk_database* mydatabase=myconnection->new_database("exampledb");
13 if (mydatabase==NULL) {cout <<"error creating mydatabase"<<endl;exit(1);}
14 hk_datasource* mydatasource= mydatabase->new_table("authors");
15 if (mydatasource==NULL) {cout <<"error creating mydatasource"<<endl;exit(1);}
16 mydatasource->enable();
17 //the following internal debugging command should not be used. It is used here for
18 //demonstration purposes only!!!!
19 mydatasource->dump_data(); // DON'T USE THIS COMMAND IN YOUR PROGRAMMS!!!
20
21 delete mydrivermanager;
22 } |