python - psycopg2 查询参数类型

Question

我有一个使用 psycopg2 调用 postgresql proc 的 python 脚本。该过程具有以下签名。

CREATE FUNCTION utility_function(p_id_file bigint, p_size bigint, p_id_volume smallint, p_id_type_file bigint, p_id_user bigint) RETURNS void

当我用下面的代码调用它时，我得到这个错误...

Traceback (most recent call last):
  File "/tmp/regenerate/regenerate.py", line 173, in <module>
    execute_process(db, out_csv, out_file, start_date, end_date, limit, offset)
  File "/tmp/regenerate/regenerate.py", line 57, in execute_process
    db.execute(sql, (id_file, size, id_volume, id_type_file, id_user))
psycopg2.ProgrammingError: function utility_function(integer, integer, integer, integer, integer) does not exist
LINE 1: select * from utility_function(13456, 132456798, 0...
                      ^
HINT:  No function matches the given name and argument types. You might need to add explicit type casts.

我不知道如何将参数转换为正确的 postgresql 类型。

Python 代码如下所示。

sql = 'select * from utility_function(%s, %s, %s, %s, %s)'
logging.debug(db.mogrify(sql, (id_file, size, id_volume, id_type_file, id_user)))
db.execute(sql, (id_file, size, id_volume, id_type_file, id_user))

db.mogrify 返回这个:

select * from utility_regenerate_tsstream(13456, 132456798, 0, 42, 1324)

在此先感谢您的帮助:)山姆

Answer 1

您可以将查询中的类型指定为强制转换:

sql = 'select * from utility_function(%s::bigint, %s::bigint, %s::smallint, %s::bigint, %s::bigint)'