cb_ptr_fun_example.htm

来自「The goal of this library is to make ODBC」· HTM 代码 · 共 33 行

<pre><code><span class="codeComment">//Simple use of cb_ptr_fun() with a BCA


// a BCA written as a simple function </span>
void BCAExample(BoundIOs &amp;cols, Example &amp;row)
{
  cols[&quot;INT_VALUE&quot;]    == row.exampleInt;
  cols[&quot;STRING_VALUE&quot;] == row.exampleStr;
  cols[&quot;DOUBLE_VALUE&quot;] == row.exampleDouble;
  cols[&quot;EXAMPLE_LONG&quot;] == row.exampleLong;
  cols[&quot;EXAMPLE_DATE&quot;] == row.exampleDate;
}

<span class="codeComment">// Read the contents of the DB_EXAMPLE table and return a vector of the
// resulting rows</span>
vector&lt;Example&gt; ReadData()
{
 vector&lt;Example&gt; results;

 <span class="codeComment">// the call to cb_ptr_fun() wraps BCAExample in a function object
 // so DTL may use it as the BCA for the DBView</span>
 DBView&lt;Example&gt; view(&quot;DB_EXAMPLE&quot;, cb_ptr_fun(BCAExample));

 DBView&lt;Example&gt;::select_iterator read_it = view.begin();
 for ( ; read_it != view.end(); ++read_it)
 {
  results.push_back(*read_it);
 }

 return results;
}

</code></pre>