[Lazarus] Lazarus, Jedi etc.
flavio.etrusco at gmail.com
Tue Jul 16 05:20:36 CEST 2013
On Mon, Jul 15, 2013 at 1:40 PM, Ludo Brands <ludo.brands at free.fr> wrote:
> Need other default (mis)behaviors for MySQL?
> -insert "123test" in an integer field: no error, it inserts 123
> -insert "123test" in a datetime field: no error, it inserts 0000-00-00
> -insert 123 in a datetime field: no error, it inserts 2000-01-23
> 00:00:00 . Yes you got that right, inserting integer 11231 translates in
> 2001-12-31 00:00:00. 11232 gives 0000-00-00 00:00:00 again. Insert
> 11231.133 and you get 2001-12-31 00:00:00 again
> -now that you understand the integer to datatime mapping do an UPDATE
> table SET date=date+4, you get 2001-12-31 00:00:04. UPDATE table SET
> date=date+400 and you obtain 2001-12-31 00:04:04.
> -UPDATE table SET date=date*2 results in 0000-00-00 00:00:00. No error.
> -more MySQL arithmetic: insert "2001-1+10+3" into a date field: You get
> 2001-01-10 03:00:00. "2001-1*10/4^2" results in 2001-01-10 04:02:00
> Throw anything at it and MySQL will swallow. Your data are in good hands ;)
- Decimals with greater precision than the column don't trigger error,
but are rounded instead;
- Check constraints are parsed but ignored;
- Char columns are not padded in the default configuration;
- Char and varchar values that are longer than the column size don't
trigger errors in the default configuration;
- Varchar values used to be always trimmed before save, not long ago.
- Changing a column to "not null" doesn't check existing values.
"Toy DB" is almost an overstatement :-/
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