返回100个特定姓氏的记录

Question

我有一个元组l，有100个姓氏。我如何在sqlite3中执行以下操作：

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,))

以便我可以返回l中包含的姓氏的所有记录。

Answer 1

  

问题：返回tuple

中包含的所有姓氏记录

核心是创建一个查询，该查询具有与序列中一样多的绑定-?-
需要[:-1]才能排除最后一个逗号...?,。

• 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

进行了测试