Question

这两个功能有问题我想知道人们是否可以告诉我哪里出错了这是一个单独的功能，作为搜索房价网站的蜘蛛的一部分

def save_house_to_db(id, address, postcode, bedrooms):
    conn = sqlite3.connect('houses_in_london.db')
    d = conn.cursor()
    d.execute('INSERT INTO TABLE houses (id, address, postcode, bedrooms) VALUES (%d %s %s %d)' %(id, str(address), str(postcode), float(bedrooms)))
    d.commit()
    d.close()

def save_transactions_to_db(id, sale_price, date):
    conn = sqlite3.connect('houses_in_london.db')
    d = conn.cursor()
    d.execute('INSERT INTO TABLE transactions (transaction_id NOT NULL AUTO_INCREMENT, house_id, date, sale_price) VALUES'
              '(%d %s %s)' %(id, sale_price, str(date)))
    d.commit()
    d.close()

这是引发的错误：

Traceback (most recent call last):
  File "/Users/saminahbab/Documents/House_Prices/final_spider.py", line 186, in <module>
    final_function(link_set=areas,id_counter=40)
  File "/Users/s/Documents/House_Prices/final_spider.py", line 158, in final_function
    page_stripper(link=(root+page), id_counter=id_counter)
  File "/Users/s/Documents/House_Prices/final_spider.py", line 79, in page_stripper
    save_house_to_db(id=float(id_counter), address=address, postcode=postcode, bedrooms=bedrooms)
  File "/Users/s/Documents/House_Prices/final_spider.py", line 25, in save_house_to_db
    d.execute('INSERT INTO TABLE houses VALUES (%d %s %s %d)' %(id, str(address), str(postcode), float(bedrooms)))
sqlite3.OperationalError: near "TABLE": syntax error

这里的参考是数据库

的执行

# conn = sqlite3.connect('houses_in_london.db')
# database = conn.cursor()
# database.execute('CREATE TABLE houses (id INTEGER PRIMARY KEY, address TEXT,'
#                  'postcode TEXT, bedrooms TEXT)')
#
# database.execute('CREATE TABLE transactions (transaction_id NOT NULL AUTO_INCREMENT, house_id INTEGER '
#                  ' REFERENCES houses(id), date TEXT, sale_price INTEGER )')

一如既往，感谢您的支持

Answer 1

你有很多问题：

INSERT-clause没有TABLE关键字
您正在尝试使用字符串格式将变量传递给SQL查询;不要这样做 - 永远 - 使用占位符，或face the consequences
您的VALUES子句在值表达式
sqlite3 module使用“？”作为占位符而不是百分号格式化程序
“transaction_id NOT NULL AUTO_INCREMENT”不是有效的列名
“AUTO_INCREMENT”is not valid SQLite syntax您可能认为transaction_id为INTEGER PRIMARY KEY - 同时AUTOINCREMENT should usually not be used

以下函数修复了一些错误，禁止对transactions表进行DDL更正。

def save_house_to_db(id, address, postcode, bedrooms):
    conn = sqlite3.connect('houses_in_london.db')
    d = conn.cursor()
    # Remove the TABLE "keyword"
    d.execute('INSERT INTO houses (id, address, postcode, bedrooms) '
              'VALUES (?, ?, ?, ?)', (id, address, postcode, bedrooms))
    d.commit()
    d.close()

def save_transactions_to_db(id, sale_price, date):
    conn = sqlite3.connect('houses_in_london.db')
    d = conn.cursor()
    # This here expects that you've fixed the table definition as well
    d.execute('INSERT INTO transactions (house_id, date, sale_price) '
              'VALUES (?, ?, ?)', (id, sale_price, date))
    d.commit()
    d.close()

Sqlite python插入表错误

1 个答案: