psycopg2:(col1,col2)IN my_list:ProgrammingError:"ARRAY"或附近的语法错误

Question

我想通过psyopg2执行这个sql:

select indexname from pg_indexes where (tablename, indexname) in ( 
      ('tab1', 'index1'),
      ('tab2', 'index2') 
);

这是代码:

cursor.execute(
'select tablename, indexname from pg_indexes where (tablename, indexname) IN %s;', [
    [('tab1', 'col1'), ('tab2', 'col2')],
               ])

我得到这个例外:

ProgrammingError: syntax error at or near "ARRAY"
LINE 1: ...e from pg_indexes where (tablename, indexname) IN ARRAY[('ta...

如何将元组列表传递给PostgreSQL和psyopg2？

Answer 1

如果你传递一个元组而不是一个列表,它可以工作:

cursor.execute(
'select tablename, indexname from pg_indexes where (tablename, indexname) IN %s;', [
    tuple([('tab1', 'col1'), ('tab2', 'col2')]),
               ])

如果你通过一个清单,不要问我失败的原因.