Mysql mulitple row insert-select statement with last_insert_id()

Question

Ok. So the short of it is, I was trying to do an INSERT SELECT such as:

START TRANSACTION;  
INSERT INTO dbNEW.entity (commonName, surname)  
SELECT namefirs         


        

Answer 1

For the last query, use this

INSERT INTO dbNEW.`user` (userID, entityID, other)  
SELECT user_id, entityID, other
FROM
(
    SELECT user_id, @key + @rn entityID, other, @rn := @rn + 1
    FROM (select @rn:=0) x, dbOLD.`user`
    order by user_id
) y;

The LAST_INSERT_ID() in MySQL is the FIRST id created in a batch, unlike SCOPE_IDENTITY() in SQL Server which is the LAST id. Since it is the first, we increment each row using the variable @rn, starting at addition=0 for the first row.

Answer 2

This case may call for a cursor based solution, where you loop over the old users, and do the 2 individual inserts. This won't do bulk inserts, but it will be better then updating the rows manually.

DELIMITER $$
DROP PROCEDURE IF EXISTS MigrateUsers $$
CREATE PROCEDURE MigrateUsers ()
BEGIN
  DECLARE done INT DEFAULT 0;
  DECLARE user_id INT;
  DECLARE namefirst VARCHAR(20);
  DECLARE namelast VARCHAR(20);
  DECLARE other VARCHAR(10);
  DECLARE lid INT;
  /*Cursor looping over old users*/
  DECLARE cur CURSOR FOR
    SELECT user_id, namefirst, namelast, other
    FROM dbOLD.user;

  DECLARE CONTINUE HANDLER FOR NOT FOUND SET done = 1;

  OPEN cur;
  START TRANSACTION; 
  read_loop: LOOP
    FETCH cur INTO user_id, namefirst, namelast, other;
    IF done THEN
      LEAVE read_loop;
    END IF;
    /*Insert entity part*/
    INSERT INTO dbNEW.entity (commonName, surname)
      VALUES (namefirst, namelast);
    SET lid = LAST_INSERT_ID();
    /*Insert user part*/
    INSERT INTO dbNEW.user (userID, entityID, other)  
    VALUES (user_id, lid, other);

  END LOOP;
  COMMIT;
  CLOSE cur;
END$$
DELIMITER ;

I suggest you read the docs on Procedures and Cursors