0

情况

我有一个烧瓶应用程序，我需要一次向其中插入多个值：

Mysql 表有 3 列：名称、电子邮件、密码

表单有三个输入：name[]、email[]、password[]

错误

TypeError：格式字符串的参数不足

编码

        @app.route("/insert", methods=["POST", "GET"])
        def insert(): 
            cur = mysql.connection.cursor() 
            if request.method == 'POST': 
                names = request.form.getlist('name[]') 
                emails = request.form.getlist('email[]')
                passwords = request.form.getlist('passwprd[]') 
                data = [names, emails, passwords] 
                for value in data: 
                    cur.executemany('INSERT INTO users (name, email, password) VALUES (%s, %s, %s)',[value]) 
                mysql.connection.commit() 
                cur.close() 
                flash('New record created successfully') 
            return redirect('/')
4

1 回答 1

0

从查看代码来看，您似乎创建了错误的数据变量。

如果看这个例子：

names = ['peter', 'patty', 'micheal']
emails = ['example@gmail.com','test@gmail.com','foo@gmail.com']
passwords = ['asghgshsdgds','123','aasasa']
data =[names, emails, passwords]
print(data)
#[['peter', 'patty', 'micheal'],['example@gmail.com', 'test@gmail.com', 'foo@gmail.com'], ['asghgshsdgds', '123', 'aasasa']]

在哪里做类似的事情：


data = list()
if len(names) == len(emails) == len(passwords):
    for i, val in enumerate(names):
        data.append([names[i], emails[i], passwords[i]])
print(data)
# [['peter', 'example@gmail.com', 'asghgshsdgds'], ['patty', 'test@gmail.com', '123'], ['micheal', 'foo@gmail.com', 'aasasa']]

这是我认为的主要问题。

所以解决方案是：

    @app.route("/insert", methods=["POST", "GET"])
    def insert(): 
        cur = mysql.connection.cursor() 
        if request.method == 'POST': 
            names = request.form.getlist('name[]') 
            emails = request.form.getlist('email[]')
            passwords = request.form.getlist('passwprd[]') 
            data = list()
            if len(names) == len(emails) == len(passwords):
                for i, val in enumerate(names):
                    data.append([names[i], emails[i], passwords[i]]) 
            for value in data: 
                cur.executemany('INSERT INTO users (name, email, password) VALUES (%s, %s, %s)', [value]) 
            mysql.connection.commit() 
            cur.close() 
            flash('New record created successfully') 
        return redirect('/')

编辑

经过进一步调查，我相信可以通过以下方式进一步简化：

    @app.route("/insert", methods=["POST", "GET"])
    def insert(): 
        cur = mysql.connection.cursor() 
        if request.method == 'POST': 
            names = request.form.getlist('name[]') 
            emails = request.form.getlist('email[]')
            passwords = request.form.getlist('passwprd[]') 
            data = list()
            if len(names) == len(emails) == len(passwords):
                for i, val in enumerate(names):
                    data.append([names[i], emails[i], passwords[i]])
            stmt = 'INSERT INTO users (name, email, password) VALUES (%s, %s, %s)'
            cursor.executemany(stmt, data)
            mysql.connection.commit() 
            cur.close() 
            flash('New record created successfully') 
        return redirect('/')
于 2021-10-26T11:44:42.103 回答