问题
I want to write a function that returns the value of a column (in this case, an auto-incrementing primary key) for a row that it inserts.
Essentially, I want to insert some new data, have a new primary key generated, then get that key. I could simply look for the highest primary key in the table, but it is possible that someone else could be running the function as well, and I could return the wrong key, right?
What's the simplest way to negotiate this problem?
回答1:
As pointed in the comments, from MySQL documentation:
mysql> SELECT LAST_INSERT_ID();
-> 195
This LAST_INSERT_ID() function is not subject to a race condition like SELECT MAX(id) might be, because it's maintained within MySQL specific to your connection. It returns the ID generated for your last insert, not anybody's last insert.
来源：https://stackoverflow.com/questions/27676672/get-field-value-of-inserted-row