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  PUBLIC "-//OASIS//DTD DITA Concept//EN" "concept.dtd">
<concept id="GUID-580471E3-7DFD-5325-A8B9-B3E7FABF872D" xml:lang="en"><title>Using
TDbColSetIter</title><shortdesc>Provides a code snippet to show you how to use the <codeph>TDbColSetIter</codeph> iterator.</shortdesc><prolog><metadata><keywords/></metadata></prolog><conbody>
<section id="GUID-3A50A4D7-B6BD-40AB-B413-167BE7DE6DE9"><title>Using the iterator</title> <p><codeph>TDbColSetIter</codeph> provides
a useful way to iterate over the contents of a column set. Given a <codeph>CDbColSet*
set</codeph>, we can count the number of nullable columns like this:</p> <codeblock id="GUID-14CED4FF-C2A4-54E4-B089-A97EA9503AE6" xml:space="preserve">TInt nullable=0;
for (TDbColSetIter iter(*set);iter;++iter)
    {
    if ((iter-&gt;iAttributes&amp;TDbCol::ENotNull)==0)
        ++nullable;
    }</codeblock> </section>
</conbody></concept>