问题
if I use this SQL:
UPDATE formulare SET EV_id=59, EV_status=5 WHERE EV_id=57 AND ID_uziv=12;SELECT LAST_INSERT_ID();
I will get 0 as last insert id.
I'm using php mysqli_insert_id and here is said that:
The mysqli_insert_id() function returns the ID generated by a query
on a table with a column having the AUTO_INCREMENT attribute.
If the last query wasn't an INSERT or UPDATE statement
or if the modified table does not have a column with the AUTO_INCREMENT attribute,
this function will return zero.
my table formualre has auto increment column, so I don't know wher the problem is
回答1:
LAST_INSERT_ID() won't work if no new auto increment value was created.
The solution is something like this:
UPDATE formulare SET EV_id=LAST_INSERT_ID(59), EV_status=5 WHERE EV_id=57 AND ID_uziv=12;SELECT LAST_INSERT_ID();
Note: I guess, that EV_id is the auto_increment primary key.
Otherwise you should do a query like:
UPDATE formulare SET key_col = LAST_INSERT_ID(key_col), EV_id=59, EV_status=5 WHERE EV_id=57 AND ID_uziv=12;SELECT LAST_INSERT_ID();
回答2:
From the documentation :
The ID generated for an AUTO_INCREMENT column by the previous query on success, 0 if the previous query does not generate an AUTO_INCREMENT value, or FALSE if no MySQL connection was established.
As your update didn't create a new record, it didn't generate any AUTO_INCREMENT value.
回答3:
UPDATE query updates the existing record, it doesn't return any new ID.
mysqli_insert_id retrieves the ID generated for an AUTO_INCREMENT column by the
previous query (usually INSERT).
There was no INSERT query, that's the reason, you won't get any Id after executing UPDATE query.
For more info, refer mysql_insert_id
来源：https://stackoverflow.com/questions/18530872/last-insert-id-not-working-on-update