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 } |