为什么 Python Mysql Query 不显示所有列，而 Phpmyadmin 做得很好？答案

【问题标题】：Why Python Mysql Query doesn't show all the columns whereas Phpmyadmin does it very well?为什么 Python Mysql Query 不显示所有列，而 Phpmyadmin 做得很好？
【发布时间】：2021-08-11 09:29:25
【问题描述】：

环境：

Python 3.7 Mysql InnoDB

我正在尝试从不同的表中收集数据。我有 4 张桌子：

任务，
类别，
type_task，
平台

当我用 Python 执行我的 SQL 请求时，我只得到 3 列而不是 6：

import mysql.connector

"""
# Get list of tasks with:
    - id (from W551je5v_pb_tasks)
    - name (from W551je5v_pb_tasks)
    - introduction (from W551je5v_pb_tasks)
    - name_platform (from W551je5v_pb_platforms)
    - name_type_tasks (from W551je5v_pb_type_tasks)
    - category (from W551je5v_pb_categories)

"""

# =========================  MAKE A FUNCTION TO GET THE MYSQL CONNECTION  ==========================================
import mysql


def get_mysql_connection():
    """
    THis function will return the connection and cursor of our Mysql database
    """
    while True:
        try:
            mysql_connection = mysql.connector.connect(
                host="1.1.1.1",
                port=3306,
                user="reader",
                passwd="123456",
                database="db"
            )
            mysql_cursor = mysql_connection.cursor(dictionary=True)
            break

        except Exception as ex:

            print(
                f"Problem with Mysql Database!\n{ex}\nIt is certainly a problem of Internet connexion. PhoneBot will retry to run in 15 seconds.")

    return  mysql_connection, mysql_cursor
mysql_connection, mysql_cursor = get_mysql_connection()
SQL_DETAILS_OF_TASKS = f"SELECT tasks.id, tasks.name, tasks.introduction, platforms.name, type_tasks.name, categories.name \
                       FROM W551je5v_pb_tasks AS tasks \
                       INNER JOIN W551je5v_pb_platforms AS platforms  \
                       ON platforms.id = tasks.id_platform  \
                       INNER JOIN W551je5v_pb_type_tasks AS type_tasks  \
                       ON tasks.id_type_task = type_tasks.id  \
                       INNER JOIN W551je5v_pb_categories AS categories  \
                       ON platforms.id_category = categories.id  \
                       WHERE tasks.enable=1"
mysql_cursor.execute(SQL_DETAILS_OF_TASKS)
tuple_all_tasks_user = mysql_cursor.fetchall()
print(tuple_all_tasks_user)
for task in tuple_all_tasks_user:
    #print(f"{task} - {type(task)}")
    for column in task:
        #print(f"{column} - {type(column)}")
        pass

输出：

[{'id': 7, 'name': 'Cold Messaging', 'introduction': '<p>Hello</p>'},
 {'id': 8, 'name': 'Cold Messaging 2', 'introduction': '<p>Hello 2</p>'},
 {'id': 8, 'name': 'Cold Messaging 3', 'introduction': '<p>Hello 3</p>'}]

如您所见，输出未显示platforms.name、type_tasks.name 和categories.name 列。所以我确实在 Phpmyadmin 中复制粘贴了我的 SQL 请求，并且我成功地在输出中获得了我的所有列。

我检查了表中的外键，我检查了表是否带有 innoDB。我还缺少什么？我更改了 admin mysql 用户的凭据，以检查它是否是某个权限的问题，但我得到了相同的结果。

我使用 Wamp/Phpmyadmin 导出导入本地 mysql 服务器中的表。通过对 Mysql 的 root 访问，我遇到了同样的问题。但是如果我在 phpmyadmin 页面中执行 SQL，它就可以了！

谁能从他的角度重现这个问题？

对我来说，这似乎是 python 而不是 SQL 的问题，不是吗？

有人遇到过类似的事情吗？

这里是重现问题的 SQL 表：

-- phpMyAdmin SQL Dump
-- version 5.0.2
-- https://www.phpmyadmin.net/
--
-- Hôte : 127.0.0.1:3306
-- Généré le : sam. 22 mai 2021 à 11:26
-- Version du serveur :  8.0.21
-- Version de PHP : 7.3.21

SET SQL_MODE = "NO_AUTO_VALUE_ON_ZERO";
START TRANSACTION;
SET time_zone = "+00:00";


/*!40101 SET @OLD_CHARACTER_SET_CLIENT=@@CHARACTER_SET_CLIENT */;
/*!40101 SET @OLD_CHARACTER_SET_RESULTS=@@CHARACTER_SET_RESULTS */;
/*!40101 SET @OLD_COLLATION_CONNECTION=@@COLLATION_CONNECTION */;
/*!40101 SET NAMES utf8mb4 */;

--
-- Base de données : `db_php`
--

-- --------------------------------------------------------

--
-- Structure de la table `w551je5v_pb_categories`
--

DROP TABLE IF EXISTS `w551je5v_pb_categories`;
CREATE TABLE IF NOT EXISTS `w551je5v_pb_categories` (
  `ID` int NOT NULL AUTO_INCREMENT COMMENT 'ID',
  `name` varchar(200) DEFAULT NULL,
  `slug` varchar(50) NOT NULL,
  `icon` varchar(300) DEFAULT NULL,
  `icon_blue_img` varchar(300) DEFAULT NULL,
  `icon_black_img` varchar(300) DEFAULT NULL,
  `icon_white_img` varchar(300) DEFAULT NULL,
  PRIMARY KEY (`ID`),
  KEY `ID` (`ID`)
) ENGINE=InnoDB AUTO_INCREMENT=16 DEFAULT CHARSET=utf8;

--
-- Déchargement des données de la table `w551je5v_pb_categories`
--

INSERT INTO `w551je5v_pb_categories` (`ID`, `name`, `slug`, `icon`, `icon_blue_img`, `icon_black_img`, `icon_white_img`) VALUES
(1, 'Cold Messaging', 'cold_messaging', '<i class=\"mdi mdi-message-text-outline menu-icon\"></i>', '', '', ''),
(2, 'Influencers', 'influencers', '<i class=\"mdi mdi-human-greeting menu-icon\"></i>', '', '', ''),
(3, 'Scraping', 'scraping', '<i class=\"mdi mdi-database menu-icon\"></i>', '', '', ''),
(4, 'Authority', 'authority', '<i class=\"mdi mdi-shape-plus menu-icon\"></i>', '', '', ''),
(5, 'Freelancer', 'freelancer', '<i class=\"mdi mdi-worker menu-icon\"></i>', '', '', '');

-- --------------------------------------------------------

--
-- Structure de la table `w551je5v_pb_platforms`
--

DROP TABLE IF EXISTS `w551je5v_pb_platforms`;
CREATE TABLE IF NOT EXISTS `w551je5v_pb_platforms` (
  `id` int NOT NULL AUTO_INCREMENT,
  `name` varchar(100) CHARACTER SET utf8 COLLATE utf8_unicode_ci NOT NULL,
  `image` text CHARACTER SET utf8 COLLATE utf8_unicode_ci NOT NULL,
  `color` varchar(7) CHARACTER SET utf8 COLLATE utf8_unicode_ci DEFAULT NULL,
  `description` text CHARACTER SET utf8 COLLATE utf8_unicode_ci NOT NULL,
  `id_category` int NOT NULL,
  `icon` varchar(300) CHARACTER SET utf8 COLLATE utf8_unicode_ci DEFAULT NULL,
  `icon_blue_img` varchar(300) CHARACTER SET utf8 COLLATE utf8_unicode_ci DEFAULT NULL,
  `icon_black_img` varchar(300) CHARACTER SET utf8 COLLATE utf8_unicode_ci DEFAULT NULL,
  `icon_white_img` varchar(300) CHARACTER SET utf8 COLLATE utf8_unicode_ci DEFAULT NULL,
  `application` varchar(900) CHARACTER SET utf8 COLLATE utf8_unicode_ci NOT NULL,
  `url` varchar(100) CHARACTER SET utf8 COLLATE utf8_unicode_ci DEFAULT NULL,
  PRIMARY KEY (`id`),
  KEY `id_category` (`id_category`),
  KEY `id` (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=41 DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci;

--
-- Déchargement des données de la table `w551je5v_pb_platforms`
--

INSERT INTO `w551je5v_pb_platforms` (`id`, `name`, `image`, `color`, `description`, `id_category`, `icon`, `icon_blue_img`, `icon_black_img`, `icon_white_img`, `application`, `url`) VALUES
(3, 'Twitter', 'twitter_automation.jpg', '#1C9CEA', 'hello 1', 1, '<i class=\"mdi mdi-twitter\"></i>', '', '', '', 'Twitter', 'https://www.twitter.com'),
(4, 'Linkedin', 'linkedin_automation.jpg', '#0077B5', 'Helllo 2', 1, '<i class=\"mdi mdi-linkedin\"></i>', '', '', '', 'Linkedin', 'https://www.linkedin.com'),
(5, 'Leboncoin', 'leboncoin_automation.jpg', '#F76B14', 'Hello 3', 3, '', 'leboncoin_blue.png', 'leboncoin_black.png', 'leboncoin_white.png', 'Leboncoin', 'https://www.leboncoin.com'),
(15, 'Facebook', 'facebook_automation.jpg', '#1877F2', 'hello 4', 1, '<i class=\"mdi mdi-facebook-box\"></i>', '', '', '', 'Facebook_Orca,Facebook_Katana', 'https://www.facebook.com'),
(22, 'Instagram', 'instagram_automation.jpg', '#A42DB6', 'hello 5', 1, '<i class=\"mdi mdi-instagram\"></i>', '', '', '', 'Instagram', 'https://www.instagram.com'),
(27, 'Twitter', 'twitter_automation.jpg', '#1DA1F2', 'hello 6', 2, '<i class=\"mdi mdi-twitter\"></i>', '', '', '', 'Twitter', 'https://www.twitter.com');

-- --------------------------------------------------------

--
-- Structure de la table `w551je5v_pb_tasks`
--

DROP TABLE IF EXISTS `w551je5v_pb_tasks`;
CREATE TABLE IF NOT EXISTS `w551je5v_pb_tasks` (
  `id` int NOT NULL AUTO_INCREMENT,
  `name` varchar(200) NOT NULL,
  `introduction` text NOT NULL,
  `description` text NOT NULL,
  `id_platform` int NOT NULL,
  `id_type_task` int NOT NULL,
  `url_keywords` varchar(300) NOT NULL,
  `url_keywords_description` text NOT NULL,
  `minimum` varchar(300) NOT NULL,
  `minimum_description` text NOT NULL,
  `url_list` varchar(300) NOT NULL,
  `url_list_description` text NOT NULL,
  `url_usernames` varchar(300) NOT NULL,
  `url_usernames_description` text NOT NULL,
  `daily_limit` int DEFAULT NULL,
  `hourly_limit` int DEFAULT NULL,
  `enable` int DEFAULT NULL,
  `smartphone_allowed` int DEFAULT NULL,
  `computer_allowed` int DEFAULT NULL,
  PRIMARY KEY (`id`),
  KEY `id_platform` (`id_platform`),
  KEY `id_type_task` (`id_type_task`)
) ENGINE=InnoDB AUTO_INCREMENT=36 DEFAULT CHARSET=utf8;

--
-- Déchargement des données de la table `w551je5v_pb_tasks`
--

INSERT INTO `w551je5v_pb_tasks` (`id`, `name`, `introduction`, `description`, `id_platform`, `id_type_task`, `url_keywords`, `url_keywords_description`, `minimum`, `minimum_description`, `url_list`, `url_list_description`, `url_usernames`, `url_usernames_description`, `daily_limit`, `hourly_limit`, `enable`, `smartphone_allowed`, `computer_allowed`) VALUES
(3, 'Group Members', 'intro 1', 'description 1', 15, 2, '0', '', '0', '', '1', 'list desc', '0', '', 15, 10, 1, 1, 1),
(4, 'Followers of accounts', 'intro 2', 'description 2', 22, 2, '0', '', '0', '', '1', 'list desc', '0', '', 20, 10, 1, 1, 1),
(5, 'Influencers', 'intro 3', 'description 3', 27, 1, '1', 'other descr', '1', 'other desc', '1', 'list desc', '0', '', 20, 10, 1, 1, 1);

-- --------------------------------------------------------

--
-- Structure de la table `w551je5v_pb_type_tasks`
--

DROP TABLE IF EXISTS `w551je5v_pb_type_tasks`;
CREATE TABLE IF NOT EXISTS `w551je5v_pb_type_tasks` (
  `id` int NOT NULL AUTO_INCREMENT,
  `name` varchar(100) CHARACTER SET utf8 COLLATE utf8_unicode_ci NOT NULL,
  `description` text CHARACTER SET utf8 COLLATE utf8_unicode_ci,
  PRIMARY KEY (`id`),
  KEY `id` (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=13 DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci;

--
-- Déchargement des données de la table `w551je5v_pb_type_tasks`
--

INSERT INTO `w551je5v_pb_type_tasks` (`id`, `name`, `description`) VALUES
(1, 'Message', ''),
(2, 'Voice Message', '<h3 class=\"card-title\" style=\"font-size:1.1em;\">                                         <i class=\"mdi mdi-format-align-left\"></i>                                         Text or Voice?                                     </h3>'),
(3, 'Scrape', ''),
(5, 'Publish Post', ''),
(6, 'Share Post', ''),
(7, 'Follow', ''),
(8, 'Unfollow', ''),
(9, 'Like', 'wxc'),
(12, 'Add Friends', 'This task is for adding friends');

--
-- Contraintes pour les tables déchargées
--

--
-- Contraintes pour la table `w551je5v_pb_platforms`
--
ALTER TABLE `w551je5v_pb_platforms`
  ADD CONSTRAINT `W551je5v_pb_platforms_ibfk_1` FOREIGN KEY (`id_category`) REFERENCES `w551je5v_pb_categories` (`ID`);

--
-- Contraintes pour la table `w551je5v_pb_tasks`
--
ALTER TABLE `w551je5v_pb_tasks`
  ADD CONSTRAINT `W551je5v_pb_tasks_ibfk_1` FOREIGN KEY (`id_type_task`) REFERENCES `w551je5v_pb_type_tasks` (`id`),
  ADD CONSTRAINT `W551je5v_pb_tasks_ibfk_2` FOREIGN KEY (`id_platform`) REFERENCES `w551je5v_pb_platforms` (`id`);
COMMIT;

/*!40101 SET CHARACTER_SET_CLIENT=@OLD_CHARACTER_SET_CLIENT */;
/*!40101 SET CHARACTER_SET_RESULTS=@OLD_CHARACTER_SET_RESULTS */;
/*!40101 SET COLLATION_CONNECTION=@OLD_COLLATION_CONNECTION */;

【问题讨论】：

您可以尝试在您的 python sql 查询中为列名起别名，例如 SELECT tasks.id, tasks.name as tname, tasks.introduction, platforms.name as pname, type_tasks.name as ttname, categories.name as cname ... 吗？我的猜测是它们都具有相同的名称name 并且 python dicts 只能具有唯一的键名，这就是为什么你只得到一个，不确定，因此留下这个作为评论，如果这对你有用，我会写这个作为答案
宾果游戏！：-）太感谢了。我不得不给我所有的列起别名
那你介意我写一个答案吗？
没问题。来吧

标签： python mysql python-3.x mysql-python

【解决方案1】：

使用mysql_connection.cursor(dictionary=True) 连接到数据库的方式将行返回为dicts。 dict 的属性是它可以具有唯一键，在您的情况下，表 name 中的所有列都具有相同的名称。所以name只能有一个键。

要克服这个问题，您需要像这样为列名起别名

SELECT tasks.id, tasks.name as tname, tasks.introduction, platforms.name as pname, type_tasks.name as ttname, categories.name as cname ....

【讨论】：