如何将字符串插入日期类型字段？

Question

I am working with a python script that selects a data from a Postgresql DB like this.

SELECT * FROM table;

One of those fields is a "datetime.date" type which I formatted with:

data.isoformat()

So now the field should be a string that looks like this: '1900-01-01'.

After that I want to put that into an IBM AS400 DB. The input field is a date type and when I try to do it I get this error message:

java.sql.SQLException: Data type mismatch.(1900-01-01)

What am I doing wrong?

Thank you for your help.

Yes I am trying to insert into an AS400 DB. It's a simple Insert statement that I wrote in Python.(looks like this but a little bigger)

insert into table (field1, field2) values (?,?);

The values are: (Decimal('0'), '1900-01-01') The second value is a datetime.date which i formatted with isoformat(). And when I try to insert i get the error message above.

Edit 2:

I am using Python. The code looks like this:

conAS400 = jaydebeapi.connect(data)
cursAS400 = conAS400.cursor()
cursAS400.execute(sql, values)

Answer 1

If your date input parameter is a string, then on PostgreSQL you can use casting types, for example:

insert into table1 (field1, field2) values (12, '2022-02-06'::date);

'2022-02-06' is a string parameter but ::date converting string type to date type on PostgreSQL.