为什么 Python Mysql 查询没有显示所有列，而 Phpmyadmin 却做得很好？

Question

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 列：

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，输出不显示 platforms.name、type_tasks.name 和 categories.name 列。所以我在 Phpmyadmin 中复制粘贴了我的 SQL 请求，我成功地获得了输出中的所有列。

我检查了表中的外键，检查了表是否使用了 innoDB。我还缺少什么？我更改了管理员 mysql 用户的凭据以检查它是否是某些权限的问题，但我得到了相同的结果。

我使用 Wamp/Phpmyadmin 在本地 mysql 服务器中导出导入表。通过对 Mysql 的 root 访问权限，我遇到了同样的问题。但是，如果我在 phpmyadmin 页面中执行 SQL，它就起作用了！

有人可以从他身边重现这个问题吗？

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 */;

Answer 1

使用 mysql_connection.cursor(dictionary=True) returns 行作为 dict 连接到数据库的方式。 dict 的属性是它可以具有唯一键，在您的情况下，所有列在 table name 中都具有相同的名称。所以那个 name.

只能有一个键

为了克服这个问题，您需要像这样为您的列命名别名

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

为什么 Python Mysql 查询没有显示所有列，而 Phpmyadmin 却做得很好？

Why Python Mysql Query doesn't show all the columns whereas Phpmyadmin does it very well?

python

mysql

python-3.x

mysql-python