如何用python在sqlite3中插入空值

Question

我在sqlite3中创建了一个表，其结构如下：

cid     name                    type    notnull         pk
0   wheelId                 INTEGER 1       1
1   wheelName           VARCHAR 1       0
2   paraDiam            INTEGER 0       0
3   paraWidth           FLOAT   0       0
4   paraEt                  FLOAT   0       0
5   paraHole            INTEGER 0       0
6   factParaHole            INTEGER 0       0
7   paraCenterhole          FLOAT   0       0
8   wheelColorName          VARCHAR 0       0
9   wheelColorNameShow  TEXT    0       0
10  paraWeight          FLOAT   0       0
11  vpPrice                 INTEGER 0       0
12  ntStock                 INTEGER 0       0
13  wheelURL            VARCHAR 0       0
14  wheelImg            VARCHAR 0       0
15  wheelRank           INTEGER 0       0

现在，我使用python在表中插入一条记录，我只想插入列值'wheelName'、'wheelImg'并保持其他列为空（第一列是wheelId，我希望它能自动递增）。在

我使用了网站上几乎所有的方法：

1. cursor.execute("""INSERT INTO WHEELS (wheelName,wheelImg) VALUES (%s,%s)""" , (WHEELNAME,WHEELIMG))

   Python抛出sqlite3.OperationalError: near "%": syntax error

2. 在

   cursor.execute("""INSERT INTO WHEELS(WHEELID,WHEELNAME, PARADIAM, PARAWIDTH, PARAET,PARAHOLE,FACTPARAHOLE,
                           PARACENTERHOLE,WHEELCOLORNAME,WHEELCOLORNAMESHOW,PARAWEIGHT,VPPRICE,NTSTOCK,
                           WHEELURL,WHEELIMG,WHEELRANK)
   
                  VALUES (%s,%s,%s,%s,%s,%s,%s,%s,%s,%s,%s,%s,%s,%s,%s,%s)""" ,
                  (WHEELID, WHEELNAME, PARADIAM, PARAWIDTH, PARAET,PARAHOLE,FACTPARAHOLE,
                   PARACENTERHOLE,WHEELCOLORNAME,WHEELCOLORNAMESHOW,PARAWEIGHT,VPPRICE,NTSTOCK,
                   WHEELURL,WHEELIMG,WHEELRANK))
   

其中我将其他值设置为None 比如：

PARADIAM = None
PARAWIDTH = None
PARAET = None
PARAHOLE = None

python再次抛出sqlite3.OperationalError: near "%": syntax error。在

Answer 1

sqlite3适配器使用?作为SQL参数，而不是%s：

cursor.execute("INSERT INTO WHEELS (wheelName,wheelImg) VALUES (?, ?)", (WHEELNAME,WHEELIMG))

您的架构还限制wheelColorNameShow：

^{pr2}$

这意味着它不能再为空。您还需要为该列包含一个值：

cursor.execute('insert into wheels (wheelName,wheelImg,wheelColorNameShow) VALUES (?, ?, ?)', ('test', 'test', 'test'))

成功。在