python - 返回 100 个特定姓氏的记录

Question

我有一个元组，l，有 100 个姓氏。我怎样才能在 sqlite3 中做这样的事情:

l = ("Smith", "Murphy", "Owens", ...)
with sqlite3.connect("census.sqlite") as conn:
    c = conn.cursor()
    c.execute('select firstname, surname from census_data where surname in ?',(l,))

这样我就可以返回l中包含的姓氏的所有记录。

Answer 1

Question: return all the records for the surnames contained in a tuple

核心是，创建一个具有与序列中一样多的绑定(bind) - ? 的查询。
需要 [:-1] 来排除最后一个逗号 ...?,。

• SQL As Understood By SQLite - whereclause

  surnames = ("Smith", "Murphy", "Owens")
  bindings = '?,'*len(surnames)
  QUERY = "select firstname, surname from census_data where surname in ({});"
            .format(bindings[:-1])
  print(QUERY)
  # >>> select firstname, surname from census_data where surname in (?,?,?);
  cur.execute (QUERY, surnames)
  

使用 Python:3.5.3 - sqlite3:2.6.0 进行测试