Question

After inserting new data into a table, I need to select some of the new data straight after, so I can use it for inserting into another table.

The only way I can think of doing this is using the ‘datetime’ field I have in my row, but how would I retrieve the latest date/time inserted.

1. INSERT statement with NOW() value for datetime

2. society_select = SELECT socID, creator, datetime FROM societies.society WHERE datetime='[..datetime is the newest...]';

Hope that makes sense. Thank you

Answer 1

There are a number of ways to do this.

Why not make use of a trigger for this?

When a trigger creates a record you can get the id’s of the records inserted. You can then do a select and insert new values into the relevant table.

MYSQL has loads of resources on using triggers.

http://dev.mysql.com/doc/refman/5.0/en/triggers.html

Or you can get the number of rows affected then use this to get the required result set in a select statement.

Get the last inserted ID?

If you are inserting one row into the database at a time then you would be able to get the last inserted id from MYSQL. This will be the Primary Key value of the record you last inserted into the database.

You would basically do something like this in mysql:

SET @inserted_id = LAST_INSERT_ID();

Or in PHP you can use the function:

mysql_insert_id(&mysql);

http://dev.mysql.com/doc/refman/5.0/en/getting-unique-id.html