我正在尝试检查数据库中的重复用户名,但出现错误:
sqlite3.ProgrammingError: Incorrect number of bindings supplied. The current statement uses 1, and there are 3 supplied.
这里提到的绑定(bind)是什么?我该如何解决这个问题?
conn = sqlite3.connect('data.db')
c = conn.cursor()
c.execute('''CREATE TABLE IF NOT EXISTS users (username, f_name, l_name, age, email, uid)''')
for u in range(0,1):
a1 = input("Enter desired username:\t")
a2 = input("Enter first name:\t")
a3 = input("Enter last name:\t")
a4 = input("Enter age:\t")
a5 = input("Enter email:\t")
a6 = str(uuid4())
add = [a1,a2,a3,a4,a5,a6]
c.execute('''SELECT username FROM users WHERE username=?''', a1)
exists = c.fetchall()
if not exists:
c.execute('INSERT INTO users VALUES(?,?,?,?,?,?)',add)
conn.commit()
else:
print("Error: Username already in use.\n")
最佳答案
这一行有一个微妙的问题:
c.execute('''SELECT username FROM users WHERE username=?''', a1)
.execute()
的第二个参数必须是一个容器!
所以你可以做这样的事情,它会起作用:
c.execute('''SELECT username FROM users WHERE username=?''', (a1,))
# ^ ^^ this is now a tuple!
关于SQLite3 Python - 检查条目是否存在,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/47209849/