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 <reference id="ref.dbplus">
  <title>DB++ Functions</title>
  <titleabbrev>DB++</titleabbrev>
  
  <partintro>
   &warn.experimental;
   
   <section id="dbplus.intro">
    &reftitle.intro;
    <para>
     db++, made by the German company <ulink
     url="&url.dbplus.company;">Concept asa</ulink>, is a relational
     database system with high performance and low memory and disk
     usage in mind. While providing SQL as an additional language
     interface, it is not really a SQL database in the first place but
     provides its own AQL query language which is much more influenced
     by the relational algebra then SQL is.
    </para>
    <para>
     Concept asa always had an interest in supporting open source
     languages, db++ has had Perl and Tcl call interfaces for years
     now and uses Tcl as its internal stored procedure language.
    </para>
   </section>

   <section id="dbplus.requirements">
    &reftitle.required;
    <para>
     This extension relies on external client libraries so you have
     to have a db++ client installed on the system you want to use
     this extension on.
    </para>
    <para>
     <ulink url="&url.dbplus.company;">Concept asa</ulink> provides
     <ulink url="&url.dbplus.download;">db++ Demo versions</ulink>
     and <ulink url="&url.dbplus.documentation;">documentation</ulink> 
     for Linux, some other UNIX versions. There is also a Windows 
     version of db++, but this extension doesn't support it (yet).      
    </para>
   </section>
   
   <section id="dbplus.installation">
    &reftitle.install;
    <para>
     In order to build this extension yourself you need the db++
     client libraries and header files to be installed on your system 
     (these are included in the db++ installation archives by default).
     You have to run <command>configure</command> with option
     <option>--with-dbplus</option> to build this extension.
    </para>
    <para>
     <command>configure</command> looks for the client libraries and
     header files under the default paths
     <filename>/usr/dbplus</filename>,
     <filename>/usr/local/dbplus</filename> and
     <filename>/opt/dblus</filename>.  If you have installed db++ in a
     different place you have add the installation path to the
     <command>configure</command> option like this:
     <option>--with-dbplus=/your/installation/path</option>.
    </para>
   </section>
   
   <section id="dbplus.configuration">
    &reftitle.runtime;
     &no.config;
   </section>
   
   <section id="dbplus.resources">
    &reftitle.resources;
    <section id="dbplus.resources.relation">
     <title>dbplus_relation</title>
     <para>
      Most db++ functions operate on or return
      <parameter>dbplus_relation</parameter> resources. A
      <parameter>dbplus_relation</parameter> is a handle to a stored
      relation or a relation generated as the result of a query.
     </para>
    </section>
   </section>

   &reference.dbplus.constants;

  </partintro>

&reference.dbplus.functions;

 </reference>
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