Python中SQL语句中的变量

我有一个包含ID和字符串变量的整数列表。如何在SQL语句中使用这些变量？如果我使用这个：

list_of_ids = [1,2,3]
s_date = '2015-01-01'

cursor.execute("""
   SELECT * FROM foo WHERE id IN (%s)
   AND start_date=%s
   """, (list_of_ids,s_date))

_id的列表将用引号括起来，不应该用引号括起来

这个问题与此相关，但仅限于声明部分

我正在使用psycopg2连接——以防有帮助。

构建为序列（以下示例中的列表）。您需要相应地调整sql部分

in_part = ','.join('%s' for _ in list_of_ids)
sql = "SELECT * FROM foo WHERE id IN (%s) AND start_date=%%s" % (in_part,)
params = list_of_ids + [s_date]  # [1, 2, 3, '2015-01-01']
cursor.execute(sql, params)

构建为序列（以下示例中的列表）。您需要相应地调整sql部分

in_part = ','.join('%s' for _ in list_of_ids)
sql = "SELECT * FROM foo WHERE id IN (%s) AND start_date=%%s" % (in_part,)
params = list_of_ids + [s_date]  # [1, 2, 3, '2015-01-01']
cursor.execute(sql, params)

要使用语法中的

，请将列表转换为元组：

list_of_ids = [1,2,3]
s_date = '2015-01-01'

query = """
    select *
    from foo
    where id in %s and start_date = %s
"""
print cursor.mogrify(query, (tuple(list_of_ids), s_date))
#cursor.execute(query, (tuple(list_of_ids), s_date))

输出：

select *
from foo
where id in (1, 2, 3) and start_date = '2015-01-01'

select *
from foo
where id = any (ARRAY[1, 2, 3]) and start_date = '2015-01-01'

要通过列表而不强制转换，请使用
=any
语法：

query = """
    select *
    from foo
    where id = any (%s) and start_date = %s
"""
print cursor.mogrify(query, (list_of_ids, s_date))
#cursor.execute(query, (list_of_ids, s_date))

输出：

select *
from foo
where id in (1, 2, 3) and start_date = '2015-01-01'

select *
from foo
where id = any (ARRAY[1, 2, 3]) and start_date = '2015-01-01'


要使用

语法中的

，请将列表转换为元组：

list_of_ids = [1,2,3]
s_date = '2015-01-01'

query = """
    select *
    from foo
    where id in %s and start_date = %s
"""
print cursor.mogrify(query, (tuple(list_of_ids), s_date))
#cursor.execute(query, (tuple(list_of_ids), s_date))

输出：

select *
from foo
where id in (1, 2, 3) and start_date = '2015-01-01'

select *
from foo
where id = any (ARRAY[1, 2, 3]) and start_date = '2015-01-01'

要通过列表而不强制转换，请使用
=any
语法：

query = """
    select *
    from foo
    where id = any (%s) and start_date = %s
"""
print cursor.mogrify(query, (list_of_ids, s_date))
#cursor.execute(query, (list_of_ids, s_date))

输出：

select *
from foo
where id in (1, 2, 3) and start_date = '2015-01-01'

select *
from foo
where id = any (ARRAY[1, 2, 3]) and start_date = '2015-01-01'

请参阅上的顶部答案，其中详细说明了正确的操作方法。请参阅上的顶部答案，其中详细说明了正确的操作方法。