Question

我有几个不同的字典，像这样：

result = {'url': url, 'league': league, 'home_team': home_team, 'away_team': away_team, 'current_time': current_time, 'current_score': current_score, 'autogoal_team': autogoal_team, 'autogoal_time': autogoal_time, 'autogoal_name': autogoal_name}
result = {'url': url, 'league': league, 'home_team': home_team, 'away_team': away_team, 'current_time': current_time, 'current_score': current_score, 'penalty_not_score_team': penalty_team, 'penalty_not_score_time': penalty_time, 'penalty_not_score_name': penalty_name}

如您所见，有很多项目，而我有更多类似的字典。现在，我以这种方式插入数据：

cur.execute('SELECT * FROM MATCHES WHERE (url=? AND league=? AND home_team=?)', (url, league, home_team))
entry = cur.fetchone()

if entry is None:
    cur.execute('INSERT INTO MATCHES (url, league, home_team) VALUES (?,?,?)', (url, league, home_team))

所以这样做非常不舒服，因为我需要确保记录没有重复，而且我必须多次执行此代码。

告诉我，我可以做这样的事情吗？

cur.execute('SELECT * FROM MATCHES WHERE (?)', (my_dict))
entry = cur.fetchone()

if entry is None:
    cur.execute('INSERT INTO MATCHES (?)', (my_dict))

因此，我想检查数据库中是否已经存在这样的字典，如果不存在，请添加它。

Answer 1

如果您在这些值上建立唯一索引（即使在导入数据时只是临时索引，如果这样对进一步的查询无济于事），则可以使用INSERT OR IGNORE。

类似的东西：

cur.execute("CREATE UNIQUE INDEX matches_idx_blah ON matches(url, league, home_team)")
for result in yourdata:
  cur.execute("INSERT OR IGNORE INTO matches(url, league, home_team) VALUES (?,?,?)", (result['url'], result['league'], result['home_team']))

这将导致任何尝试插入重复行的尝试都将失败，而不会真正产生错误。

如果不存在，如何在sqlite3 db dict中插入

1 个答案: