Question

Python的MySQLdb模块应该使用SQL语句字符串中的格式说明符来实现占位符。我正在关注MYSQL CookBook的一个例子

import sys
import MySQLdb
import Cookbook

try:
    conn = Cookbook.connect ()
    print("Connected")
except MySQLdb.Error as e:
    print("Cannot connect to server")
    print("Error code:", e.args[0])
    print("Error message:", e.args[1])
    sys.exit (1)

cursor = conn.cursor ()
cursor.execute (""" 
                INSERT INTO profile (name,birth,color,foods,cats)
                VALUES(%s,%s,%s,%s,%s)
                """,("Josef", "1971-01-01", None, "eggroll", 4))

但是当我从shell检查时

mysql> SELECT * FROM profile WHERE name LIKE  'J%';
+----+--------+------------+-------+----------------+------+
| id | name   | birth      | color | foods          | cats |
+----+--------+------------+-------+----------------+------+
|  7 | Joanna | 1952-08-20 | green | lutefisk,fadge |    0 |
+----+--------+------------+-------+----------------+------+

很明显没有插入任何内容。为什么？如果我按照建议添加cursor.commit

    cursor.commit()
AttributeError: 'Cursor' object has no attribute 'commit'

Answer 1

您没有提交交易。

执行查询后，最后添加conn.commit()。

cursor = conn.cursor()
cursor.execute (""" 
            INSERT INTO profile (name,birth,color,foods,cats)
            VALUES(%s,%s,%s,%s,%s)
            """,("Josef", "1971-01-01", None, "eggroll", 4))
conn.commit()

MySQLdb占位符实现不起作用

1 个答案: