How do i insert in an insert command with mysql? - mysql

Question

I have a simple insert select which insert _TABLE_B_ data in _TABLE_A_ new row
INSERT INTO _TABLE_A_(_USERNAME_,_ID_)
SELECT _USERNAME_,_ID_
FROM _TABLE_B_
I want to insert a row in a table named _TABLE_C_ each time i insert a row in _TABLE_A_ and add the current inserted _TABLE_C_ id in _TABLE_A_.
i'll try to explain it in an other way :
INSERT INTO _TABLE_A_(_USERNAME_,_ID_,_FOREIGN_ID_)
SELECT B._USERNAME_,B._ID_,C._FOREIGN_ID_
FROM _TABLE_B_ AS B
LEFT JOIN _TABLE_C_ AS C
#Insert a row in _TABLE_C_ to retrieve _FOREIGN_ID_...
I'm searching for a single minimal query which have the INSERT SELECT statement like mine because insert select can loop and i have to loop.
FYI :
I'm in a stored procedure.
I also use prepared statements with dynamic data, and cursors is not suitable for dynamic data select...

Answer 1

I would do all the INSERTs in _TABLE_C_ first and then join it in the INSERT _TABLE_A_ to get the appropriate foreign keys.
If that is not possible, I would use a cursor.
Cursor on _TABLE_B_ & Fetch
INSERT _TABLE_C_
INSERT _TABLE_A_ with Foreign_Id = SCOPE_IDENTITY()
Fetch next

Answer 2

I found a solution.
create a temporary table and add dynamic select statement which retrieve the primary keys (id)
declare a cursor and select this temporary table id ( variables doesn't work but temporary tables do )
execute statement to create temporary table
open the cursor and iterate the inserts
EXAMPLE
BEGIN
DECLARE isDone INT DEFAULT 0;
DECLARE fetchedmemberWhoWillReceiveMailId int;
DECLARE cur1 CURSOR FOR SELECT id FROM memberWhoWillReceiveMail;
DECLARE CONTINUE HANDLER FOR SQLSTATE '02000' SET isDone = 1;
SET SESSION TRANSACTION ISOLATION LEVEL SERIALIZABLE;
SET #sexe = VAR_sexe;
SET #event = VAR_eventId;
SET #subject = VAR_subject;
SET #body = VAR_body;
SET #to = VAR_to;
SET #from = VAR_from;
SET #region = VAR_region;
SET #departement = VAR_departement;
SET #age = VAR_age;
SET #baseSqlStatement =' CREATE TEMPORARY TABLE memberWhoWillReceiveMail SELECT e.id FROM TABLE_A as e LEFT JOIN TABLE_B AS a on a.member_id = e.id';
SET #whereSqlStatement= 'WHERE e.is_visible = 1 AND e.member_group_id IN (10,11) ';
IF (#region!='') THEN
SET #whereSqlStatement= CONCAT(#whereSqlStatement,' AND region=',#region);
END IF;
IF (#event !=null ) THEN
SET #whereSqlStatement= CONCAT(#whereSqlStatement,' AND m.event_id !=' ,#eventId);
END IF;
IF (#sexe!=null ) THEN
SET #whereSqlStatement= CONCAT(#whereSqlStatement,' AND e.sexe=',#sexe);
END IF;
SET #baseSqlStatement = CONCAT(#baseSqlStatement,#whereSqlStatement);
START TRANSACTION;
PREPARE stmt1 FROM #baseSqlStatement;
EXECUTE stmt1;
DEALLOCATE PREPARE stmt1;
OPEN cur1;
FETCH cur1 INTO fetchedmemberWhoWillReceiveMailId;
WHILE NOT isDone DO
INSERT INTO conversation(created_at,updated_at)VALUES(now(),now());
INSERT INTO message(created_at,updated_at,from, to, uniqueID) VALUES(now(),now(),#from,fetchedmemberWhoWillReceiveMailId,LAST_INSERT_ID() );
FETCH cur1 INTO fetchedmemberWhoWillReceiveMailId; END WHILE; CLOSE cur1;
COMMIT;
DROP TEMPORARY TABLE IF EXISTS memberWhoWillReceiveMail;
END