通过MySQL中的循环将1NF数据插入表中

Question

如何在表中插入多行数据以维护1NF？现在我有一个html表单，可以创建一个组，您可以在其中添加/邀请组成员加入。您可以添加/邀请多个或一个：组成员的输入可能因用户而异。我想获取用户输入并将其添加到维护1NF的表中。我想在MySQL中创建一个存储过程，一旦我有了值列表并进行“I”insert调用（I是用户邀请的成员数），就调用它

创建团队的我的App.route：现在我正在将数据插入tb_团队表，接下来我想用用户和相关团队id填充团队成员表

@app.route('/create-team/', methods=['GET', 'POST'])
@login_required
def create_team():
    msg = ''

    if request.method == 'POST':

        # Create variables for easy access
        team_name = request.form['team_name']
        invite = request.form['invite']
        team_desc = request.form['content']

    if not team_name:
        msg='Please enter a group name'
        return render_template('create_team.html', msg=msg, team_name=team_name, invite=invite, content=team_desc)

    if not invite:
        msg = 'Please invite users to the team'
        return render_template('create_team.html', msg=msg, team_name=team_name, invite=invite, content=team_desc)

    if not invite and not team_name:
        msg = 'Please fill out the form'
        return render_template('create_team.html', msg=msg)


    cursor = mysql.connection.cursor(MySQLdb.cursors.DictCursor)
    cursor.execute('SELECT user_id from tb_user WHERE user_name = %s', (invite,))
    invite_id = cursor.fetchone()
    invite_id_final = invite_id['user_id']

    # Check if team_name exists in tb_team table
    cursor.execute('SELECT * FROM tb_team WHERE team_name = %s', (team_name,))
    name = cursor.fetchone()

    # If team_name currently exists, show error that it is taken
    if name:
        msg = 'This Project Name is already taken!'
        return render_template('create_team.html', msg=msg, team_name=team_name, invite=invite, content=team_desc)
    else:
        msg = 'You have successfully created a team!'
        cursor.execute("INSERT INTO tb_team (team_name)"
                       " VALUES (%s)", (team_name))
        mysql.connection.commit()
        return redirect(url_for('team_page', group_name=team_name))

return render_template('create_team.html')

以下是我的数据库设计以及我希望最终实现的目标：

使用此处的虚拟数据：

编写存储过程是插入这些组成员的正确方法吗

传递要添加字符串变量的用户列表，使其通过while循环，获取每个由逗号分隔的用户，并将其添加到表中，直到字符串变量中不再存在其他用户？（请参见下面关于我的存储过程的代码）

DELIMITER 
CREATE PROCEDURE basicInsert()
BEGIN
    SET @myArrayOfUsers = '100,102,105,'
WHILE(LOCATE(',', @myArrayOfUsers) > 0) DO
        SET @value = ELT(1, @myArrayOfUsers);
        SET @myArrayOfUsers= SUBSTRING(@myArrayOfUsers, LOCATE(',',@myArrayOfUsers) + 1);
        INSERT INTO `group_member` VALUES(1001, @value);
END WHILE;


END;
 DELIMITER ;


 CALL basicInsert();

谢谢大家!！我们衷心感谢您的帮助

Answer 1

你的程序有一些大问题

ELT不会给你想要的东西。它实际上返回完整的@MyArrayFuser

如果没有临时表，调试循环是很棘手的，但是当您不确定代码的结果是什么时，请临时删除该循环并添加更多@user变量，然后逐行调试它

DROP procedure IF EXISTS `basicInsert`;

DELIMITER $$
CREATE DEFINER=`root`@`localhost` PROCEDURE `basicInsert`()
BEGIN
    SET @myArrayOfUsers = '100,102,105';
    #SET @myArrayOfUsers = '106,107,108,';
    WHILE(LOCATE(',', @myArrayOfUsers) > 0) DO
            SET @value = SUBSTRING_INDEX(@myArrayOfUsers,',',1);
            IF (LENGTH(@myArrayOfUsers) > LENGTH(@value) +2)  THEN
                SET @myArrayOfUsers= SUBSTRING(@myArrayOfUsers, LENGTH(@value) + 2);
                INSERT INTO `group_member` VALUES(1001, @value);
            ELSE
                INSERT INTO `group_member` VALUES(1001, @value);
                  to end while loop
                SET @myArrayOfUsers=  '';
            END IF;
            IF LENGTH(@myArrayOfUsers) > 0 AND LOCATE(',', @myArrayOfUsers) = 0 then
                  Last entry was withóut comma
                INSERT INTO `group_member` VALUES(1001, @myArrayOfUsers);
            END IF;
    END WHILE;
END$$

DELIMITER ;

我测试，正如你所看到的，在结尾没有逗号的情况下

就像你只想做的那样！NF，我不检查已经存在的入口