title: %ud, %vud what are those
body: <p>What is the meaning of this code written in c++?</p>
  
  <pre><code>PGBulkInserter pgBulkInserter(postgreSQL, HOST_TRAFFIC_SCHEMA_NAME, date,
                              flushSize, "%ud, %ud, %ud, %ud, %ud, " \
                              "%ul, %ul, %Vul, %Vud, %Vud, %Vud, %Vul, " \
                              "%Vud, %Vud, %Vud, %Vud, %Vud, %ud, %ud, " \
                              "%ud, %ud, %ud");
  </code></pre>
  
  <p>I understand that it is creating an instance of <code>PGBulkinserter</code>, but what is the meaning of <code>%ul, %ud %vud</code>, etc.? Would you explain the deeper meaning (i.e., how many parameters <code>PGbulkinsterter</code> has, etc.)?</p>
  
  <p>I think they are like types <code>%d, %f</code>, etc. Does anyone knows if  <code>%ud</code> means an unsigned version of <code>%d</code> (I'm just guessing).</p>
  
  <p>Edit: I'm pretty sure that <code>%ud</code> is a 32 bit unsigned decimal, which is used for time in another piece of code. Also, <code>"%ul, %ul, %Vul, %Vud, %Vud, %Vud, %Vul, "</code> is related to the type for all entries in the table. Now, the question is <strong>what is <code>\</code>?</strong></p>