MYSQL - 查找刚添加的记录的ID

Question

OK, so here is my scenario - you may disagree with what I'm attempting to do but I have my reasons. The user is able to upload various information to the database, I also want them to be able to upload a picture at the same time. Now for various reasons I want to store the image with the file name the ID number of the record I'm adding (I have an ID column as the primary which auto-increments). Obviously I would have to store the file extension in the database too. Now is there a way I can add the record and then know what ID was set so that I can save the image? I don't want to query and select the highest ID as that could go wrong if two people were to submit the form at the same time. Any ideas?

Answer 1

LAST_INSERT_ID() will give you the ID that was auto-generated:

... returns a BIGINT (64-bit) value representing the first automatically generated value that was set for an AUTO_INCREMENT column by the most recently executed INSERT statement to affect such a column. For example, after inserting a row that generates an AUTO_INCREMENT value, you can get the value like this:

 mysql> SELECT LAST_INSERT_ID(); -> 195 

Answer 2

在PHP中运行插入后，您可以从$mysqli->insert_id （其中$ mysqli是MySQLi连接对象）， $pdo->lastInsertId （其中$ pdo是PDO连接对象）或mysql_insert_id()获取AUTO_INCREMENT ID （如果你还在使用MySQL ，你不应该这样做）而不必运行另一个查询。