python – 无法从SQLITE3数据库中获取最后一行id

2019年8月4日 513次阅读

我有一个要求输入的脚本,然后将该输入插入到表中.

下次运行脚本时,我希望它告诉用户最后一个输入有什么ID.

该表如下所示：id INTEGER PRIMARY KEY AUTOINCREMENT,userid TEXT,domain TEXT,password TEXT,webserver TEXT,sqlserver TEXT

我被告知我可以使用来自SQLITE_SEQUENCE WHERE name =’table_name’的SELECT seq,但它会产生以下文本：而不是最后一行的id.

请注意,我是一个非常新的Python / SQLite3编码器！

供您参考,代码sofar如下所示：

#!/usr/bin/python
import os, sys, sqlite3
######## CHECK SYSTEM COMPATIBILITY ########
if os.name =='posix':
    os.system("clear")#CLEAR SCREEN#
    pass
else:
    sys.exit("Operating System is not supported")
######## END CHECK SYSTEM COMPATIBILITY ########
######## CHECK IF SCRIPT IS RUN AS ROOT ########
#if os.geteuid() != 0:
#       sys.exit("Script must be run as root")
#else:
#       pass
####### END CHECK IF SCRIPT IS RUN AS ROOT ########
####### CREATE DATABASE AND CHECK IF TABLE EXISTS ##########
conn = sqlite3.connect("dat.db")
c = conn.cursor()
c.execute ('''CREATE TABLE IF NOT EXISTS kunder
            (id INTEGER PRIMARY KEY AUTOINCREMENT, userid TEXT, domain TEXT, password      TEXT, webserver TEXT, sqlserver TEXT)''')
conn.commit()
print c.execute ("SELECT seq from SQLITE_SEQUENCE WHERE name='kunder'")
conn.close()
######## DONE CREATE DATABASE AND CHECK IF TABLE EXISTS #########
###### ASK FOR INPUT ##########
########### HERE NEEDS TO BE A CHECK TO DETERMINE THE LATEST USERID - ALSO NEEDS TO BE    FOR WEBSERVER AND PASSWORD #################
userid = raw_input("Enter userid: ")
########### HERE NEEDS TO BE A CHECK TO SEE IF USERID EXISTS!!!!!#####################
domain = raw_input("Enter domain: ")
password = raw_input("Enter password: ")
########### NEEDS TO BE A WAY TO AUTOGENERATE A PASSWORD!!! ####################
webserver = raw_input("Enter webserver: ")
sqlserver = raw_input("Enter sqlserver: ")
###### FINISHED ASK FOR INPUT #######
######## DATABASE ###########
conn = sqlite3.connect("dat.db")
c = conn.cursor()
c.execute ("INSERT INTO kunder (userid, domain, password, webserver, sqlserver) VALUES    (?,?,?,?,?)", (userid, domain, password, webserver, sqlserver))
conn.commit()
conn.close()
####### DONE WITH DATABASE ##########

最佳答案 SQL语句SELECT max(id)FROM table_name应该为您提供最大ID.如果你是自动递增,那么这将与最后插入的相同.

编辑：在python中获取实际值意味着从游标中读取它：

cursor = sqlite3.execute('SELECT max(id) FROM table_name')
max_id = cursor.fetchone()[0]

fetchone()将select语句中的第一行作为元组返回(除非使用了row_factory),因此在这种情况下,fetchone()[0]将返回第一个(并且只有)第一列(且仅) row,即max(id).

有关详细信息,请参阅http://docs.python.org/2/library/sqlite3.html.

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