[odb-users] Use SQLite functions to create timestamps by default

[Henri Schwarz]

Hi,

in chapter 14.4.7 of the documentation is an example how to set the default
value of a column to the current timestamp.

#pragma db options("DEFAULT CURRENT_TIMESTAMP()")

  date timestamp_;                    // DEFAULT CURRENT_TIMESTAMP()

I tried this using SQLite but it doesn't seem to work right. At first I had
to remove the parentheses at the end (throws exception on schema creation).
I found out that *date* is a typedef for* long* which is mapped to an
INTEGER but the SQLite documentation states that CURRENT_TIMESTAMP returns
a timestring (TEXT).

If the default value of a column is CURRENT_TIME, CURRENT_DATE or
CURRENT_TIMESTAMP, then the value used in the new row is a text
representation of the current UTC date and/or time. /*...*/ The format for
CURRENT_TIMESTAMP is "YYYY-MM-DD HH:MM:SS".

In the means of SQLite this shouldn't be a problem due to the dynamic
typing.

So with a persistent class member declared as *date* or *long* I end up
with a timestamp in the database that seems to be the positive maximum for
the SQLite integer type (4777546605244151150) since it doesn't change when
I recreate the database and start all over.

Nevertheless when I change the timestamp_ member in the persistent class to
*std::string* or use the pragma *type("TEXT")* the column remains empty
when I create items in the table through ODB.

The CREATE TABLE statement with the *std:string* timestamp_ member looks as
follows.


When I insert items manually (using SQLite Browser) the timestring is put
in the row correctly.

So am I getting something completely wrong here or could this even be a
bug?