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 found a solution.

1. create a temporary table and add dynamic select statement which retrieve the primary keys (id)
2. declare a cursor and select this temporary table id ( variables doesn’t work but temporary tables do )
3. execute statement to create temporary table
4. open the cursor and iterate the inserts

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EXAMPLE

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  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