def robotsrulesetOfDomain(self, domain):
		'''检查domain是否在数据库中,
			否 --> (False, None)
			是 --> (True, 数据库中存储的robots.txt内容)
		'''
		exist = False
		cur = self.conn.cursor()
		# 是否存在
		cur.execute("SELECT 1 FROM Domains WHERE domain=?", (domain,))
		if cur.fetchone() :
			exist = True
		# 存在的话,结果是什么
		cur.execute("SELECT rules FROM Domains,Rulesets "
			"WHERE domain=? AND Domains.did=Rulesets.did"
			,(domain,) )
		ruleset = cur.fetchone()
		return (exist, ruleset)
def edit_category(category_id):
    category = Category.query.filter_by(id=category_id).first_or_404()

    form = CategoryForm(obj=category)

    if form.validate_on_submit():
        form.populate_obj(category)
        flash(_("Category updated."), "success")
        category.save()

    return render_template("management/category_form.html", form=form,
                           title=_("Edit Category"))