So let's execute an actual query. There is no "query class" in libpqxx™; we really do try to keep your life simple.

A query is executed within a transaction by passing the query string to the transaction object's exec method. If the query fails to complete successfully, this method will throw the appropriate exception.

The query itself is a standard C string in this case, ie. a const char * but you'll frequently want to use a C++ string to make it easy to include variables:

	void DeleteEntry(work &T, string Table, long ID)
	{
	T.exec("DELETE FROM " + Table + " WHERE ID=" + to_string(ID));
	}
      

In some places, even stringstreams will work, so you can use the full stream formatting capabilities, locales etc. in the standard C++ library to compose your SQL queries.