Flask 错误1064 sql语法错误

我正在尝试使用WTF表单进行注册，当我试图通过flask执行注入数据时，我遇到了一个sql语法错误。但是我可以通过mysql命令行使用普通sql查询插入数据

from wtforms import Form, BooleanField, StringField, PasswordField, validators
from MySQLdb import escape_string as thwart

class RegistrationForm(Form):
    username = StringField('Username', [validators.Length(min=4, max=25)])
    email = StringField('Email Address', [validators.Length(min=6, max=35)])
    password = PasswordField('New Password', [validators.DataRequired(), validators.EqualTo('confirm', message='Passwords must match')])
    confirm = PasswordField('Repeat Password')
    accept_tos = BooleanField('I accept the TOS', [validators.DataRequired()])
# for registering the user
@app.route('/register/', methods = ['GET', 'POST'])
def register_page():
    try:
        form = RegistrationForm(request.form)
        if request.method == 'POST' and form.validate():
            username = form.username.data
            email = form.email.data
            password = sha256_crypt.encrypt(str(form.password.data))

            c, conn = connection()
            x = c.execute("SELECT * FROM users WHERE username = '(%s)'" %(thwart(username),))
            #x = c.fetchone()
            if int(x) > 0:
                flash ("that username already taken, please take another")
                return render_template("register.html", form =form)
            else:
                c.execute("INSERT INTO users (username, password, email, tracking) VALUES (%s, %s, %s, %s)" %(thwart(username), thwart(password), thwart(email), thwart('/home/')))
                c.commit()
                flash("Thanks for registering")
                c.close()
                conn.close()
                gc.collect()

                session['logged_in'] = True
                session['username'] = username
                return redirect(url_for('dashboard'))


        return render_template("register.html", form = form)
    except Exception as e:
        return render_template("register.html", error = e, form = form)

错误可以在下面找到

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在输入密码并将其与确认匹配并提交后。我犯了一个错误。谁能帮我一下吗。

您的SQLite语句看起来有误

x = c.execute("SELECT * FROM users WHERE username = '(%s)'" %(thwart(username),))

据我所知，单引号已经在处理中，但在任何情况下，您都可以使用准备好的语句：

x = c.execute("SELECT * FROM users WHERE username = ?", (thwart(username)))

c.execute("INSERT INTO users (username, password, email, tracking) VALUES (?, ?, ?, ?)" (thwart(username), thwart(password), thwart(email), thwart('/home/')))
            c.

您的

INSERT

语句也是如此：

x = c.execute("SELECT * FROM users WHERE username = ?", (thwart(username)))

c.execute("INSERT INTO users (username, password, email, tracking) VALUES (?, ?, ?, ?)" (thwart(username), thwart(password), thwart(email), thwart('/home/')))
            c.

同样地

query2 = "INSERT INTO users (username, password, email, tracking) VALUES (%s, %s, %s, %s)"

c.execute(query2, (thwart(username), thwart(password), thwart(email), thwart('/home/'))

---

成功了

这起作用了。但我得到一个新的错误，称为'str'对象在实现此代码后不可调用@Tim BiegeleisenCan你能至少在发生错误的地方给我一个行号吗？

password=sha256\u crypt.encrypt（str（form.password.data））

。。。你确定你的代码没有其他问题吗？我不确定。我正在尝试检查您前面询问的错误行。我使用password=sha256_crypt.encrypt（form.password.data）运行它，但仍然收到相同的错误@蒂姆·比格莱森