Question

我正在尝试使用pyll的sqllite自动增量功能。从我在网上看到的你只需要特定的ID INTEGER PRIMARY KEY AUTOINCREMENT或其他什么然后你插入并且不指定id列。但是，当我的脚本插入一个值时，它给我一个错误，只指定3列而不是4列，这意味着它要求我指定id列，所以我对如何进行自动增量有点困惑。

    cur.execute("""CREATE TABLE ROOMS(ID INTEGER PRIMARY KEY AUTOINCREMENT, 
                       NAME TEXT, 
                       TAGLINE TEXT,
                       DATE DATE)""")



    cur.execute("""INSERT INTO ROOMS 
                    VALUES(?,?,?)""" , ( name, tagline, str(creation_date) ))
    conn.commit()

表ROOMS有4列，但提供了3个值

完整代码

#!/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

该表有4列，您插入的数量不足。

您需要指定要插入的列：

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

您未插入任何内容的列将获得默认值，例如如果未指定其他默认值，则为NULL。主键列中的NULL使数据库为您生成id。

或者只是在ID列中插入一个显式的NULL：

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

python sqllite自动增量仍然要求插入时的id字段

1 个答案: