public void close() throws SQLException {
        release();
        // Close connection, ignore exceptions
        if (this.connection != null) {
            try {
                this.getConnection().close();
            } catch (Exception e) {
                LOG.error(e);
            }
        }
    }
Executes an arbitrary SQL Statement.

@param stmt The SQL statement to execute
@return A ResultSet encapsulating the results or null on error
src/main/java/org/replicadb/manager/SqlManager.java