      </select>
                    </div>
                </div>
                <div class="form-group row" id="dbhost-field">
                    <label class="col-sm-2 col-form-label">数据库地址</label>
                    <div class="col-sm-10">
                        <input class="form-control" name="DB_HOST" value="127.0.0.1">
                        <small class="form-text">填入MySQL数据库的地址。</small>
                    </div>
                </div>
                <div class="fo