<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <HTML ><HEAD ><TITLE >Use a query</TITLE ><META NAME="GENERATOR" CONTENT="Modular DocBook HTML Stylesheet Version 1.7"><LINK REL="HOME" TITLE="The hk_classes programmer's tutorial" HREF="index.html"><LINK REL="PREVIOUS" TITLE="Searching a column" HREF="chapter8.html"><META HTTP-EQUIV="Content-Style-Type" CONTENT="text/css"><LINK REL="stylesheet" HREF="common/kde-common.css" TYPE="text/css"><META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=iso-8859-1"><META HTTP-EQUIV="Content-Language" CONTENT="en"><LINK REL="stylesheet" HREF="common/kde-localised.css" TYPE="text/css" TITLE="KDE-English"><LINK REL="stylesheet" HREF="common/kde-default.css" TYPE="text/css" TITLE="KDE-Default"></HEAD ><BODY CLASS="CHAPTER" BGCOLOR="#FFFFFF" TEXT="#000000" LINK="#AA0000" VLINK="#AA0055" ALINK="#AA0000" STYLE="font-family: sans-serif;" ><DIV CLASS="logoheader" ><A HREF="http://www.kde.org/" ></A ></DIV ><DIV CLASS="NAVHEADER" ><TABLE SUMMARY="Header navigation table" WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" ><TR ><TH COLSPAN="3" ALIGN="center" >The hk_classes programmer's tutorial</TH ></TR ><TR ><TD WIDTH="10%" ALIGN="left" VALIGN="bottom" ><A HREF="chapter8.html" ACCESSKEY="P" >Prev</A ></TD ><TD WIDTH="80%" ALIGN="center" VALIGN="bottom" ></TD ><TD WIDTH="10%" ALIGN="right" VALIGN="bottom" > </TD ></TR ></TABLE ><HR ALIGN="LEFT" WIDTH="100%"></DIV ><DIV CLASS="CHAPTER" ><H1 ><A NAME="CHAPTER9" ></A >Chapter 9. Use a query</H1 ><P >A result query works like a table. Note: the SQL statement has no delimiter at the end, even if the used database needs one. <DIV CLASS="EXAMPLE" ><HR><A NAME="AEN129" ></A ><P ><B >Example 9-1. Use a query</B ></P ><TABLE BORDER="0" BGCOLOR="#E0E0E0" WIDTH="100%" ><TR ><TD ><PRE CLASS="PROGRAMLISTING" > 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 <FONT COLOR="RED" >hk_datasource* mydatasource= mydatabase->new_resultquery();</FONT > 15 <FONT COLOR="RED" >mydatasource->set_sql("SELECT * FROM literature");</FONT > 16 if (mydatasource==NULL) {cout <<"error creating mydatasource"<<endl;exit(1);} 17 mydatasource->enable(); 18 //the following internal debugging command should not be used. It is used here for 19 //demonstration purposes only!!!! 20 mydatasource->dump_data(); // DON'T USE THIS COMMAND IN YOUR PROGRAMMS!!! 21 22 delete mydrivermanager; 23 }</PRE ></TD ></TR ></TABLE ><HR></DIV ></P ></DIV ><DIV CLASS="NAVFOOTER" ><HR ALIGN="LEFT" WIDTH="100%"><TABLE SUMMARY="Footer navigation table" WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" ><A HREF="chapter8.html" ACCESSKEY="P" >Prev</A ></TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" ><A HREF="index.html" ACCESSKEY="H" >Home</A ></TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" > </TD ></TR ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" >Searching a column</TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" > </TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" > </TD ></TR ></TABLE ></DIV ></BODY ></HTML >