循环工作正常，但是当调用 sqlite 执行时，它在第一行之后停止

Question

这是 Python for Everyone 数据可视化项目的第一阶段。 我无法弄清楚为什么循环在第 90-91 行的 SQL 命令期间停止工作。 我已经逐段对其进行了测试，如果您注释掉最后一个 MySQL 命令，则循环可以正常工作，但是当您将它们保留在其中添加一个成功的行后，它会停止工作。

import urllib.request, urllib.parse, urllib.error
import sqlite3
import json
import ssl

api_key = "800a5c3b"
serviceurl = "http://www.omdbapi.com/?"

conn = sqlite3.connect('omdb.sqlite')
cur = conn.cursor()

cur.execute('DROP TABLE IF EXISTS Omdbdump;')
cur.execute('''CREATE TABLE Omdbdump (
    id  INTEGER NOT NULL PRIMARY KEY AUTOINCREMENT UNIQUE,
title TEXT, year TEXT, rated TEXT, released TEXT, runtime TEXT, genre TEXT, director TEXT, writer TEXT, actors TEXT, plotlong TEXT, language  TEXT, country TEXT, awards TEXT, poster URL, imdbrating REAL, rtrating REAL, mcrating REAL, imdbid TEXT, type TEXT, dvd TEXT, boxoffice TEXT, production TEXT, website URL)
''')

# Ignore SSL certificate errors
ctx = ssl.create_default_context()
ctx.check_hostname = False
ctx.verify_mode = ssl.CERT_NONE

fh = cur.execute('''SELECT id, title, year FROM top50''')

rty = list()
for row in fh:
    #row = cur.fetchone()
    qtitle = str(row[1])
    qyear = str(row[2])

    #print(rty)
    print(qtitle)
    print(qyear)

    #parms sets up the query url: url concatenated with address and api key
    #query format https://www.omdbapi.com/?t=blade+runner&y=2018&plot=full&apikey=800a5c3b

    parms = dict()
    parms["t"] = qtitle
    parms["y"] = qyear
    parms["plot"] = "full"
    parms["apikey"] = api_key
    url = serviceurl + urllib.parse.urlencode(parms)

    print('Retrieving', url)
    uh = urllib.request.urlopen(url, context=ctx)
    data = uh.read().decode()
    print('Retrieved', len(data), 'characters', data[:20].replace('\n', ' '))
    
    js = json.loads(data)
    if js['Response'] == 'False':
        print('==== Failure To Retrieve ====')
        print(data)
        continue
   
    title = js['Title']
    year = js['Year']
    rated = js['Rated']
    released = js['Released']
    runtime = js['Runtime']
    genre = js['Genre']
    director = js['Director']
    writer = js['Writer']
    actors = js['Actors']
    plotlong = js['Plot']
    language = js['Language']
    country = js['Country']
    awards = js['Awards']
    poster = js['Poster']
    imdbrating = js['imdbRating']
    mcrating = js['Metascore']
    imdbid = js['imdbID']
    type = js['Type']
    dvd = js['DVD']
    boxoffice = js['BoxOffice']
    production = js['Production']
    website = js['Website']
    try:
        rtrating = js['Ratings'][1]['Value']
    except:
        rtrating = 'N/A'
    
    print(title)
    print(imdbid)
    print(runtime)
    
    #the loop works until here -- with the following lines, it goes through once then stops...
    
    cur.execute('''INSERT INTO Omdbdump (title, year, rated, released, runtime, genre, director, writer, actors, plotlong, language, country, awards, poster, imdbrating, rtrating, mcrating, imdbid, type, dvd, boxoffice, production, website) VALUES ( ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ? )''', (title, year, rated, released, runtime, genre, director, writer, actors, plotlong, language, country, awards, poster, imdbrating, rtrating, mcrating, imdbid, type, dvd, boxoffice, production, website) )
    conn.commit()

print("Done")

Answer 1

程序在这里改变光标的“值”

cur.execute('''INSERT INTO Omdbdump.......)

在此处迭代光标时for row in fh:。

可能的解决方案：

• 为插入创建另一个光标
• 使用连接的执行方法进行插入。

Answer 2

接受的答案是 [DinoCoderSaurus][1] 的一个很好的解释，它帮助我回答了我自己的 [问题][2]，但 connection.execute() 的建议在 apsw 中不起作用。在使用元组列表链接两个循环之后，我必须连接一些 sql 并将一些调用放入一个新循环中。

对 OP 案例的答案将是改变：

    cur.execute('''INSERT INTO Omdbdump (title, year, rated, released, runtime, genre, director, writer, actors, plotlong, language, country, awards, poster, imdbrating, rtrating, mcrating, imdbid, type, dvd, boxoffice, production, website) VALUES ( ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ? )''', (title, year, rated, released, runtime, genre, director, writer, actors, plotlong, language, country, awards, poster, imdbrating, rtrating, mcrating, imdbid, type, dvd, boxoffice, production, website) )

到：

values=[] #outside the original loop

#then inside the loop    
    values.append((title, year, rated, released, runtime, genre, director, writer, actors, plotlong, language, country, awards, poster, imdbrating, rtrating, mcrating, imdbid, type, dvd, boxoffice, production, website))

#then after the values harvesting loop has closed a new loop:
for value in values:
    cur.execute('''INSERT INTO Omdbdump (title, year, rated, released, runtime, genre, director, writer, actors, plotlong, language, country, awards, poster, imdbrating, rtrating, mcrating, imdbid, type, dvd, boxoffice, production, website) VALUES ( ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ? )''', value)


  [1]: https://stackoverflow.com/users/5577076/dinocodersaurus
  [2]: https://stackoverflow.com/questions/69706486/why-does-apsw-cursor-executesql-vars-break-outer-for-loop/69712751#69712751