title: How can I check if OpenSQLConnection was successful (in Mathematica)?
body: <p>How can I check if DatabaseLink`OpenSQLConnection was successful? My code is as follows</p>
  
  <pre><code>conn = OpenSQLConnection[JDBC["hsqldb", "file"], "Name"-&gt; "test"];
  </code></pre>
  
  <p>Can I use something like Head[conn]?</p>