How can the mysql last_insert_id function be used?

In MySQL, you can use the LAST_INSERT_ID() function to retrieve the auto-incremented ID value of the last inserted data. This function returns the value generated by the most recent insert operation on an AUTO_INCREMENT column.

The usage instructions are as follows:

1. After inserting data, simply call the LAST_INSERT_ID() function to retrieve the auto-incremented ID value, for example:

INSERT INTO table_name (column1, column2) VALUES ('value1', 'value2');
SELECT LAST_INSERT_ID();

1. You can also directly use the LAST_INSERT_ID() function in the INSERT statement to retrieve the auto-increment ID value, for example:

INSERT INTO table_name (id, column1, column2) VALUES (LAST_INSERT_ID(), 'value1', 'value2');

It is important to note that the LAST_INSERT_ID() function is only valid within the current connection. If multiple connections are inserting data simultaneously, the function must be used within the same connection to correctly retrieve the auto-incremented ID value.