python sqllite自动增量仍然要求插入的id字段

Question

我试图使用sqllite autoincrement功能与python。从我在线阅读你只需要特定的ID INTEGER PRIMARY KEY AUTOINCREMENT或其他什么，然后你插入并且不指定id列。然而，当我的脚本去插入一个值时，它给我一个关于只指定3列而不是4的错误，这意味着它寻找我指定id列，所以我有点困惑，以至于如何执行自动递增。

表间客房均设有4个列，但提供了3个值

全码

#!/usr/bin/env python 
# -*- coding: utf-8 -*- 
# Copyright [current year] the Melange authors. 
# 
# Licensed under the Apache License, Version 2.0 (the "License"); 
# you may not use this file except in compliance with the License. 
# You may obtain a copy of the License at 
# 
# http://www.apache.org/licenses/LICENSE-2.0 
# 
# Unless required by applicable law or agreed to in writing, software 
# distributed under the License is distributed on an "AS IS" BASIS, 
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 
# See the License for the specific language governing permissions and 
# limitations under the License. 

from multiprocessing import Pool, Process 
from datetime import datetime 
import boto3 
import sys 
import os 
import argparse 
import logging 
import logging.config 
from bottle import route, run 
from boto.cloudformation.stack import Output 
import json 
import socket 
import sqlite3 as lite 

def connect_db(): 
    con = None 
    con = lite.connect('master.db') 
    cur = con.cursor() 
    objects = [] 
    objects.append(con) 
    objects.append(cur) 
    return objects 

def create_chatroom(name, tagline, cur, conn): 
     #create the message room for the name of the room you are creating. 
     try: 
      cur.execute("""CREATE TABLE %s (ID INTEGER PRIMARY KEY AUTOINCREMENT, 
          ROOM_ID INT, 
          ROOM_MESSAGE TEXT, 
          USER_ID INT, 
          DATE DATE)""" % name) 
     except Exception as e: 
      logger.info('%s already exist' % name) 

     creation_date = datetime.now() 
     #insert id,name,tagline,date 
     cur.execute("""INSERT INTO ROOMS 
         VALUES(?,?,?)""" , (name, tagline, str(creation_date))) 
     conn.commit() 
     logger.info('created room %s!' % name) 

def init_tables (conn, cur): 
    try: 
     cur.execute("""CREATE TABLE ROOMS(ID INTEGER PRIMARY KEY AUTOINCREMENT, 
          NAME TEXT, 
          TAGLINE TEXT, 
          DATE DATE)""") 

     cur.execute("""CREATE TABLE USERS(ID INTEGER PRIMARY KEY AUTOINCREMENT, 
          FIRSTNAME TEXT, 
          LASTNAME TEXT, 
          HEADLINE TEXT, 
          PHONE TEXT, 
          EMAIL TEXT, 
          PASSWORD TEXT, 
          DATE DATE)""") 

     cur.execute("""CREATE TABLE FRIENDS(ID INTEGER PRIMARY KEY AUTOINCREMENT, 
          IDFIRST INT, 
          IDSECOND INT, 
          DATE DATE)""") 
     conn.commit() 
     logger.info('Successfully Created Tables!') 
    except: 
     logger.info('Tables already exist!')  

def setup_db(logger): 
    try: 
     logger.info('Building Database Tables.') 
     init_db = connect_db() 

     con = init_db[0] 
     cur = init_db[1] 
     #inital tables 
     try: 
      init_tables (con, cur) 
     except Exception as e: 
      logger.info('Tables Exist.') 

     try: 
      create_chatroom('Lobby', 'Insight is the future', cur, con) 
     except Exception as e: 
      logger.info('Lobby already exist %s ' % e) 

     try:  
      cur.execute('SELECT ID FROM ROOMS WHERE NAME="Lobby"') 
      id = cur.fetchone() 
      welcome_date = datetime.datetime 
      cur.execute("INSERT INTO Lobby VALUES(?,?,?,?)" , (id, 'Welcome to the Insight Lobby!', '1',str(welcome_date),)) 
     except Exception as e: 
      logger.info('%s' % e) 

     con.commit() 
     con.close() 
    except Exception as e: 
     logger.info(str(e)) 
     pass 

@route('/get_chat/<name>') 
def get_status(name="Get Loading Status"): 
    values = name.split('&') 
    room = values[0] 
    init_db = connect_db() 

    con = init_db[0] 
    cur = init_db[1] 
    cur.execute('SELECT * FROM %s' % str(room)) 
    values = cur.fetchall() 
    return values 


if __name__ == '__main__': 
    url = os.path.dirname(os.path.realpath(__file__)) + '/logging.ini' 
    logging.config.fileConfig(url) 
    logger = logging.getLogger('root')  
    setup_db(logger) 
    #ip_address = socket.gethostbyname(socket.gethostname()) 
    run(host='127.0.0.1', port=8001, debug=True) 

Answer 1

表有4列，你将小于说。

你需要指定你要插入的列：

INSERT INTO ROOMS(NAME, TAGLINE, DATE) VALUES(?,?,?) 

列你不插入任何东西会得到默认值，例如如果没有指定其他缺省值，则为NULL。主键列中的NULL使数据库为您生成一个ID。

或者刚刚插入显式空对ID列：

INSERT INTO ROOMS VALUES(NULL,?,?,?)