使用 Flask 从 WTForms SelectField 检索键值

Question

我在使用 Flask 中的 WTForms 时遇到问题，我想创建一个 add_menu 函数来将菜单添加到数据库中。用户可以相应地从 SelectField "Appetizer"、"Main Dish" 或 "Drinks" 中进行选择。因此，每当用户从 SelectField 选择值时，它都会添加到数据库中相应的 table 中。（我使用 MySQL）。出于某种原因，当我使用 menu_type = form.menu_type.data 它给了我以下错误

mysql_exceptions.ProgrammingError: (1064, "You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ''main_dishes'(name,ingredients,price) VALUES('Salmon', '
duude,frv
', '35')' at line 1") It takes the right value, but I have this awkward '' signs infront of main_dishes string My code looks as follows:

class MenuForm(Form):
    menu_type = SelectField('Menu Type', [validators.DataRequired()], choices=[('appetizers','Appetizer'),('main_dishes','Main Dish'),('desserts','Dessert'),('drinks','Drinks')], coerce=str)
    name = StringField('Name', [validators.Length(min=1, max=2000)])
    ingredients = TextAreaField('Ingredients', [validators.Length(min=10)])
    price = DecimalField('Price (Manat)', [validators.DataRequired()])

@app.route('/add_menu', methods=['GET','POST'])
@is_logged_in
def add_menu():
    form = MenuForm(request.form)
    if request.method == 'POST' and form.validate():
        menu_type = form.menu_type.data # <---Here is the problem
        name = form.name.data
        ingredients = form.ingredients.data
        price = form.price.data

        #Create cursor
        cur = mysql.connection.cursor()

        #execute
        cur.execute("INSERT INTO %s(name,ingredients,price) VALUES(%s, %s, %s)", (menu_type,name,ingredients,price))

        #Commit to DB
        mysql.connection.commit()

        #CLose connection
        cur.close()

        flash('Menu is Added', 'success')

    return redirect(url_for('dashboard'))

return render_template('add_menu.html', form=form)

Answer 1

table 名称被替换为带引号的字符串，并按此执行查询。

您可能希望在绑定参数化值之前使用 table 名称构建查询。

query = "INSERT INTO {}(name,ingredients,price) VALUES(%s, %s, %s)".format(menu_type)
cur.execute(query, (name,ingredients,price))

使用 Flask 从 WTForms SelectField 检索键值

Retrieving a key value from WTForms SelectField using Flask

mysql

flask

python-3.x

wtforms