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<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->iAttributes&TDbCol::ENotNull)==0)

        ++nullable;

    }</codeblock> </section>

</conbody></concept>