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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<HTML
><HEAD
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>Get in contact with a table</TITLE
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>Chapter 2. Get in contact with a table</H1
><P
>&#13;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&#38;)".</P
><P
>  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-&#62;new_resultquery(); ).</P
><P
>  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.</P
><P
>&#13;
<DIV
CLASS="EXAMPLE"
><HR><A
NAME="AEN42"
></A
><P
><B
>Example 2-1. Get in contact with a table</B
></P
><TABLE
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><PRE
CLASS="PROGRAMLISTING"
>   1&nbsp;
   2&nbsp;  #include &#60;hk_classes.h&#62;
   3&nbsp;  #include &#60;iostream&#62;
   4&nbsp;  int main()
   5&nbsp;  {
   6&nbsp;  hk_drivermanager* mydrivermanager = new hk_drivermanager();
   7&nbsp;  if (mydrivermanager==NULL) {cout &#60;&#60;"error creating mydrivermanager"&#60;&#60;endl;exit(1);}
   8&nbsp;  hk_connection* myconnection = mydrivermanager-&#62;new_connection();
   9&nbsp;  if (myconnection==NULL) {cout &#60;&#60;"error creating myconnection"&#60;&#60;endl;exit(1);}
  10&nbsp;  myconnection-&#62;connect();
  11&nbsp;
  12&nbsp;  <FONT
COLOR="RED"
>hk_database* mydatabase=myconnection-&#62;new_database("exampledb");</FONT
>
  13&nbsp;  <FONT
COLOR="RED"
>if (mydatabase==NULL) {cout &#60;&#60;"error creating mydatabase"&#60;&#60;endl;exit(1);}</FONT
>
  14&nbsp;  <FONT
COLOR="RED"
>hk_datasource* mydatasource= mydatabase-&#62;new_table("authors");</FONT
>
  15&nbsp;  <FONT
COLOR="RED"
>if (mydatasource==NULL) {cout &#60;&#60;"error creating mydatasource"&#60;&#60;endl;exit(1);}</FONT
>
  16&nbsp;  <FONT
COLOR="RED"
>mydatasource-&#62;enable();</FONT
>
  17&nbsp;  <FONT
COLOR="RED"
>//the following internal debugging command should not be used. It is used here for</FONT
>
  18&nbsp;  <FONT
COLOR="RED"
>//demonstration purposes only!!!! </FONT
>
  19&nbsp;  <FONT
COLOR="RED"
>mydatasource-&#62;dump_data(); // DON'T USE THIS COMMAND IN YOUR PROGRAMMS!!!</FONT
>
  20&nbsp;
  21&nbsp;  delete mydrivermanager;
  22&nbsp;  }</PRE
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