首先,我是一个初学者,我先感谢您的帮助:)
当我插入一个字符串时,它给我一个双引号或单引号错误。这仅在我调用我创建的函数insert()时发生。但是,当我只用数字代替那些不带引号的字符串时,它就起作用了。
import mysql.connector
conn = mysql.connector.connect(user="root",password='password',
host='localhost',database='library',port='3306')
cur = conn.cursor()
def create_table():
cur.execute("CREATE TABLE IF NOT EXISTS store
(id INT PRIMARY KEY, item VARCHAR(25), quantity INT, price REAL);")
conn.commit()
conn.close()
def insert(id, item, quantity, price):
cur.execute("INSERT INTO store (id, quantity, price, item)
VALUES (%s, %s, %s, %s)" % (id, item, quantity, price))
conn.commit()
conn.close()
insert(50, 'test', 20, 10)
然后出现错误:
Traceback (most recent call last):
File "C:\Program Files\Python36\lib\site-
packages\mysql\connector\connection_cext.py", line 392, in cmd_query
raw_as_string=raw_as_string)
_mysql_connector.MySQLInterfaceError: Unknown column 'test' in 'field list'
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File "C:\Users\Acer\Desktop\Remastered.py", line 128, in <module>
insert(50, 'test', 20, 10)
File "C:\Users\Acer\Desktop\Remastered.py", line 109, in insert
cur.execute("INSERT INTO store (id, quantity, price, item) VALUES (%s, %s, %s, %s)" % (id, item, quantity, price))
File "C:\Program Files\Python36\lib\site-packages\mysql\connector\cursor_cext.py", line 266, in execute
raw_as_string=self._raw_as_string)
File "C:\Program Files\Python36\lib\site-packages\mysql\connector\connection_cext.py", line 395, in cmd_query
sqlstate=exc.sqlstate)
mysql.connector.errors.ProgrammingError: 1054 (42S22): Unknown column 'test' in 'field list'
[Finished in 0.8s with exit code 1]
答案 0 :(得分:0)
您没有正确使用占位符功能。正确的行是:
cur.execute("INSERT INTO store (id, quantity, price, item)
VALUES (%s, %s, %s, %s)", (id, item, quantity, price))
请注意,
和不 %
会造成严重的SQL injection bugs。
您的查询被扩展为类似的内容:
INSERT INTO store (...) VALUES (1, test, 1, 1.0);
test
部分未加引号,并且被视为可能的列名。
答案 1 :(得分:0)
您已经混合了insert语句中的列顺序,将“ INSERT INTO商店(id,数量,价格,商品)”更改为“ INSERT INTO商店(id,项目,数量,价格)”,请注意列的位置命名项目是! 导入mysql.connector
def create_table():
cur.execute("CREATE TABLE IF NOT EXISTS store " \
"(id INT PRIMARY KEY, item VARCHAR(25), quantity INT, price REAL);")
conn.commit()
return
def insert(id, item, quantity, price):
cur.execute("INSERT INTO store (id, item, quantity, price)" \
"VALUES (%s, '%s', %s, %s)" % (id, item, quantity, price))
conn.commit()
return
#
conn = mysql.connector.connect(user="root",
host='localhost',database='DO',port='3306')
cur = conn.cursor()
create_table
insert(50, 'test', 20, 10)
insert(51, 'test', 20, 10)
insert(52, 'test', 20, 10)
conn.close()
从MySQL
mysql> select * from store;
+----+------+----------+-------+
| id | item | quantity | price |
+----+------+----------+-------+
| 50 | test | 20 | 10 |
| 51 | test | 20 | 10 |
| 52 | test | 20 | 10 |
+----+------+----------+-------+
3 rows in set (0.00 sec)
mysql> INSERT INTO store (id, item, quantity, price) VALUES (53, 'test', 20, 10);
Query OK, 1 row affected (0.00 sec)
mysql> select * from store;
+----+------+----------+-------+
| id | item | quantity | price |
+----+------+----------+-------+
| 50 | test | 20 | 10 |
| 51 | test | 20 | 10 |
| 52 | test | 20 | 10 |
| 53 | test | 20 | 10 |
+----+------+----------+-------+
4 rows in set (0.00 sec)