MY SQL 创建带有外键的表失败的解决办法 [Err] 1005 - Can't create table 'xx' (errno: 150)...

本文记录了在数据库学习过程中遇到的[Err]1005-Can't create table 'xx'(errno:150)错误,分享了多次尝试后通过查阅手册找到解决办法的经历,并对比了无法创建及成功创建的例子。

今天学习数据库的时候,提到有 Foreign Key 的 问题,提示出现 [Err] 1005 - Can't create table 'xx' (errno: 150)

试了好多次,终于不行,从首都图书馆回到家类,上网查了,还是没有可靠的答案。

没辙了,只好查看手册,手册真是个好东西。

下面我把我不能创建的例子和成功创建的例子,帖子下面,诸位看完肯定知道怎么回事情了。

from re import match import mysql.connector import requests from bs4 import BeautifulSoup from mysql.connector import errorcode headers = {'User-Agent': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/108.0.0.0 Safari/537.36'} conn = mysql.connector.connect( host="localhost", user="root", password="123456", database="test" ) cursor = conn.cursor() def create_tables(): tables = { 'students': ( "CREATE TABLE students (" "id INT AUTO_INCREMENT PRIMARY KEY," "name VARCHAR(50) NOT NULL," "sex VARCHAR(50) NOT NULL," "age INT" ")" ), 'class': ( "CREATE TABLE class (" "id INT AUTO_INCREMENT PRIMARY KEY," "class_name VARCHAR(50) NOT NULL," "class_score INT" ")" ), 'score': ( "CREATE TABLE score (" "id INT AUTO_INCREMENT PRIMARY KEY," "student_id INT NOT NULL," "class_id INT NOT NULL," "score DECIMAL(5,2) CHECK (score BETWEEN 0 AND 100)," "FOREIGN KEY (student_id) REFERENCES students(id)" " ON UPDATE CASCADE ON DELETE RESTRICT," # 注意逗号分隔 "FOREIGN KEY (class_id) REFERENCES class(id)" " ON UPDATE CASCADE ON DELETE RESTRICT" ")" ) } try: # 按依赖顺序创建 cursor.execute(tables['students']) cursor.execute(tables['class']) cursor.execute(tables['score']) conn.commit() print("创建成功") except mysql.connector.Error as err: if err.errno == errorcode.ER_TABLE_EXISTS_ERROR: print("已存在") else: print(f"创建失败: {err.msg}") def insert_student(table, data): try: placeholders = ', '.join(['%s'] * len(data[0])) sql = f"INSERT INTO {table} (id, name, sex, age) VALUES ({placeholders})" cursor.executemany(sql, data) except mysql.connector.Error as err: if err.errno == errorcode.ER_TABLE_EXISTS_ERROR: print("none") else: print(f"插入失败: {err.msg}") def insert_score(table, data): try: placeholders = ', '.join(['%s'] * len(data[0])) sql = f"INSERT INTO {table} (student_id, class_id, score) VALUES ({placeholders})" cursor.executemany(sql, data) except mysql.connector.Error as err: if err.errno == errorcode.ER_TABLE_EXISTS_ERROR: print("none") else: print(f"插入失败: {err.msg}") def get_data(url): re = requests.get(url, headers=headers).json() for i in range(2,len(re)): stu = [[re[i][0], re[i][1], re[i][2], re[i][3]]] insert_student('students',stu) if re[i][4] == '语文': sco = [[re[i][0], 1, re[i][5]]] insert_score('score',sco) if re[i][4] == '英语': sco = [[re[i][0], 2, re[i][5]]] insert_score('score', sco) if re[i][4] == '数学': sco = [[re[i][0], 3, re[i][5]]] insert_score('score', sco) # 执行创建 create_tables() get_data('http://article.xishanyigu.com/index/index/test')
07-19
2025-08-27 04:02:24.363 | INFO | logging:callHandlers:1706 - Started server process [28] app_1 | 2025-08-27 04:02:24.363 | INFO | logging:callHandlers:1706 - Waiting for application startup. app_1 | /opt/naura/.venv/lib/python3.11/site-packages/aiomysql/cursors.py:158: Warning: Table 'users_roles' already exists app_1 | while (await self.nextset()): app_1 | 2025-08-27 04:02:24.617 | INFO | app:lifespan:74 - App EquipLedgerAdmin runtime: 0.0031706166666666665 min app_1 | 2025-08-27 04:02:24.621 | ERROR | logging:callHandlers:1706 - Traceback (most recent call last): app_1 | File "/opt/naura/.venv/lib/python3.11/site-packages/tortoise/backends/mysql/client.py", line 50, in translate_exceptions_ app_1 | return await func(self, *args) app_1 | ^^^^^^^^^^^^^^^^^^^^^^^ app_1 | File "/opt/naura/.venv/lib/python3.11/site-packages/tortoise/backends/mysql/client.py", line 224, in execute_script app_1 | await cursor.execute(query) app_1 | File "/opt/naura/.venv/lib/python3.11/site-packages/aiomysql/cursors.py", line 239, in execute app_1 | await self._query(query) app_1 | File "/opt/naura/.venv/lib/python3.11/site-packages/aiomysql/cursors.py", line 457, in _query app_1 | await conn.query(q) app_1 | File "/opt/naura/.venv/lib/python3.11/site-packages/aiomysql/connection.py", line 469, in query app_1 | await self._read_query_result(unbuffered=unbuffered) app_1 | File "/opt/naura/.venv/lib/python3.11/site-packages/aiomysql/connection.py", line 683, in _read_query_result app_1 | await result.read() app_1 | File "/opt/naura/.venv/lib/python3.11/site-packages/aiomysql/connection.py", line 1164, in read app_1 | first_packet = await self.connection._read_packet() app_1 | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ app_1 | File "/opt/naura/.venv/lib/python3.11/site-packages/aiomysql/connection.py", line 652, in _read_packet app_1 | packet.raise_for_error() app_1 | File "/opt/naura/.venv/lib/python3.11/site-packages/pymysql/protocol.py", line 219, in raise_for_error app_1 | err.raise_mysql_exception(self._data) app_1 | File "/opt/naura/.venv/lib/python3.11/site-packages/pymysql/err.py", line 150, in raise_mysql_exception app_1 | raise errorclass(errno, errval) app_1 | pymysql.err.OperationalError: (1091, "Can't DROP COLUMN `dept_code`; check that it exists") app_1 | app_1 | During handling of the above exception, another exception occurred: app_1 | app_1 | Traceback (most recent call last): app_1 | File "/opt/naura/.venv/lib/python3.11/site-packages/starlette/routing.py", line 693, in lifespan app_1 | async with self.lifespan_context(app) as maybe_state: app_1 | File "/usr/local/lib/python3.11/contextlib.py", line 204, in __aenter__ app_1 | return await anext(self.gen) app_1 | ^^^^^^^^^^^^^^^^^^^^^ app_1 | File "/opt/naura/.venv/lib/python3.11/site-packages/fastapi/routing.py", line 133, in merged_lifespan app_1 | async with original_context(app) as maybe_original_state: app_1 | File "/usr/local/lib/python3.11/contextlib.py", line 204, in __aenter__ app_1 | return await anext(self.gen) app_1 | ^^^^^^^^^^^^^^^^^^^^^ app_1 | File "/opt/naura/.venv/lib/python3.11/site-packages/fastapi/routing.py", line 134, in merged_lifespan app_1 | async with nested_context(app) as maybe_nested_state: app_1 | File "/usr/local/lib/python3.11/contextlib.py", line 204, in __aenter__ app_1 | return await anext(self.gen) app_1 | ^^^^^^^^^^^^^^^^^^^^^ app_1 | File "/opt/naura/app/__init__.py", line 64, in lifespan app_1 | await modify_db() app_1 | File "/opt/naura/app/core/init_app.py", line 81, in modify_db app_1 | await command.upgrade(run_in_transaction=True) app_1 | File "/opt/naura/.venv/lib/python3.11/site-packages/aerich/__init__.py", line 204, in upgrade app_1 | await self._upgrade(conn, version_file, fake=fake) app_1 | File "/opt/naura/.venv/lib/python3.11/site-packages/aerich/__init__.py", line 186, in _upgrade app_1 | await conn.execute_script(await upgrade(conn)) app_1 | File "/opt/naura/.venv/lib/python3.11/site-packages/tortoise/backends/mysql/client.py", line 58, in translate_exceptions_ app_1 | raise OperationalError(exc) app_1 | tortoise.exceptions.OperationalError: (1091, "Can't DROP COLUMN `dept_code`; check that it exists") app_1 |
最新发布
08-28
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