I found the below procedure and have edited it a bit - trying to figure out how i can set variable str to a query result 'tags' --(Select tags from Post where id > 3) so I can create the temp table from its contents... nothing I do seems to help.
BEGIN
DECLARE a INT Default 0 ;
DECLARE str VARCHAR(255);
simple_loop: LOOP
SET a=a+1;
SET str=SPLIT_STR(fullstr,",",a);
IF str='' THEN
LEAVE simple_loop;
END IF;
insert into Tmp values (str);
END LOOP simple_loop;
END
Select Into statement will do that.
BEGIN
DECLARE a INT Default 0 ;
DECLARE str VARCHAR(255);
simple_loop: LOOP
SET a=a+1;
Select tags into str from Post where id > 3;
SET str=SPLIT_STR(str,",",a);
IF str='' THEN
LEAVE simple_loop;
END IF;
insert into Tmp values (str);
END LOOP simple_loop;
END
Related
I am getting a syntax error at simple_loop: Loop statement saying
Unexpected character near ':'
in the line simple_loop: LOOP
Please help
DELIMITER $$
CREATE PROCEDURE getTable(fullstr VARCHAR(555))
BEGIN
DECLARE a INT Default 0
DECLARE str VARCHAR(255)
simple_loop: LOOP
SET a=a+1
SET str=SPLIT_STR(fullstr,",",a)
IF str='' THEN
LEAVE simple_loop
END IF
#Do Inserts into temp table here with str going into the row
insert into my_temp_table values (str)
END LOOP simple_loop
END $$
It is a very annoying MySQL syntax related issue: There is a TAB somewhere in you procedure leading to this parse issue.
Note: Separate ;
DELIMITER $$
CREATE PROCEDURE getTable(fullstr VARCHAR(555))
BEGIN
DECLARE a INT Default 0 ;
DECLARE str VARCHAR(255);
simple_loop: LOOP
SET a=a+1;
SET str=SPLIT_STR(fullstr,",",a);
IF str='' THEN
LEAVE simple_loop;
END IF;
#Do Inserts into temp table here with str going into the row
insert into my_temp_table values (str);
END LOOP simple_loop;
END $$
Can someone kindly tell me where I'm wrong ?
This procedure returns an error near
#recuperato = #recuperato - saldofattura;
I mistake to update the variable #recuperato?
Thanks to all
DELIMITER //
DROP PROCEDURE IF EXISTS fatture_lettere_retail//
CREATE PROCEDURE fatture_lettere_retail (idcontratto INT(11))
BEGIN
DECLARE finito INT default 0;
DECLARE idfattura INT default 0;
DECLARE saldofattura DECIMAL(10,2);
DECLARE cur1 CURSOR FOR SELECT idfattura,saldofattura FROM fatture_lettere_isa;
DECLARE CONTINUE HANDLER FOR SQLSTATE '02000'
SET finito = 1;
SET #recuperato=(SELECT SUM(valorea)-SUM(valorer) FROM ImportiContratto WHERE idcontratto=idcontratto AND idimporto=1);
ciclo: LOOP
SET finito = 0;
FETCH cur1 INTO idfattura,saldofattura;
IF finito THEN
LEAVE ciclo;
END IF;
IF (#recuperato-saldofattura>=0) THEN
#recuperato = #recuperato-saldofattura;
DELETE FROM fatture_lettere_isa WHERE idfattura=idfattura;
ELSE
UPDATE fatture_lettere_isa SET saldofattura=saldofattura-#recuperato;
LEAVE ciclo;
END IF;
END LOOP ciclo;
CLOSE cur1;
END; //
DELIMITER;
Add the SET keyword at the beginning of the row in question:
SET #recuperato = #recuperato-saldofattura;
You have to write SET keyword to assign value to variable "#recuperato" as follow:
SET #recuperato = #recuperato-saldofattura;
I have a syntax error with my code, which adds 1000 random records to a table.\
CREATE PROCEDURE addrecords()
BEGIN
DECLARE a INT Default 1;
my_loop: LOOP
<INSERTING>
SET a = a + 1;
IF a=1001 THEN
LEAVE my_loop;
END IF;
END LOOP my_loop;
END
first syntax error is at default 1 saying it's missing a semicolon, then at my_loop and there are like 4 more.. Any help please? It seems good to go from what I've gooogled.
You need to change the delimiter before defining the statement:
DELIMITER $$
CREATE PROCEDURE addrecords()
BEGIN
DECLARE a INT Default 1;
my_loop: LOOP
<INSERTING>
SET a = a + 1;
IF a=1001 THEN
LEAVE my_loop;
END IF;
END LOOP my_loop;
END
$$
Otherwise, the ; will end the entire CREATE PROCEDURE statement.
How to use for loop in MySQL data set ?
FOR x IN (SELECT column FROM table_name WHERE column_2 = input_val)
LOOP
sum_total := sum_total + x.column ;
END LOOP;
This is an example how I used to loop data set in oracle.
How can this be achieved in MySql ?
How about not looping at all. It's SQL after all.
SELECT SUM(`column`) total
FROM table_name
WHERE column_2 = <input_val>
Otherwise use CURSOR
Now, equivalent loop using CURSOR will look like
DELIMITER $$
CREATE PROCEDURE sp_loop(IN input_val INT)
BEGIN
DECLARE done INT DEFAULT FALSE;
DECLARE sum_current, sum_total INT DEFAULT 0;
DECLARE cur1 CURSOR FOR SELECT column1 FROM table_name WHERE column2 = input_val;
DECLARE CONTINUE HANDLER FOR NOT FOUND SET done = TRUE;
OPEN cur1;
read_loop: LOOP
FETCH cur1 INTO sum_current;
IF done THEN
LEAVE read_loop;
END IF;
SET sum_total = sum_total + sum_current;
END LOOP;
CLOSE cur1;
SELECT sum_total;
END$$
DELIMITER ;
Here is SQLFiddle
DROP PROCEDURE IF EXISTS `foo`.`usp_cursor_example`;
DELIMITER $$
CREATE DEFINER=`root`#`localhost` PROCEDURE `foo`.`usp_cursor_example`(
IN name_in VARCHAR(255)
)
READS SQL DATA
BEGIN
DECLARE name_val VARCHAR(255);
DECLARE status_update_val VARCHAR(255);
-- Declare variables used just for cursor and loop control
DECLARE no_more_rows BOOLEAN;
DECLARE loop_cntr INT DEFAULT 0;
DECLARE num_rows INT DEFAULT 0;
-- Declare the cursor
DECLARE friends_cur CURSOR FOR
SELECT
name
, status_update
FROM foo.friend_status
WHERE name = name_in;
-- Declare 'handlers' for exceptions
DECLARE CONTINUE HANDLER FOR NOT FOUND
SET no_more_rows = TRUE;
OPEN friends_cur;
select FOUND_ROWS() into num_rows;
the_loop: LOOP
FETCH friends_cur
INTO name_val
, status_update_val;
IF no_more_rows THEN
CLOSE friends_cur;
LEAVE the_loop;
END IF;
select name_val, status_update_val;
-- count the number of times looped
SET loop_cntr = loop_cntr + 1;
END LOOP the_loop;
-- 'print' the output so we can see they are the same
select num_rows, loop_cntr;
END
DELIMITER ;
I have tried to create the following procedure in mysql
PROCEDURE fix()
BEGIN
DECLARE event_id_ INT;
DECLARE gate_number INT;
DECLARE l_done INT DEFAULT 0;
DECLARE curs_event_id CURSOR FOR SELECT DISTINCT event_id FROM history_15min;
DECLARE curs_gate_number CURSOR FOR SELECT DISTINCT gate_number
FROM history_15min WHERE event_id =event_id_;
( -- HERE IS THE PROBLEM - event_id_ IS BLANK THERE FOR THE INNER LOOP RETURNS NO RESULTS ....)
DECLARE CONTINUE HANDLER FOR NOT FOUND SET l_done=1;
OPEN curs_event_id;
event_loop : LOOP
FETCH curs_event_id INTO event_id_;
IF l_done=1 THEN LEAVE event_loop;
END IF;
OPEN curs_gate_number;
gate_loop : LOOP
FETCH curs_gate_number INTO gate_number;
IF l_done=1 THEN LEAVE gate_loop;
END IF;
insert into t value ('1');
END LOOP gate_loop;
CLOSE curs_gate_number;
SET l_done=0;
END LOOP event_loop;
CLOSE curs_event_id;
END
Is there a way i can get the result from the first loop to be a variable in the second loop ??
Thank CHill60 , your link had the answer i was looking for
here is the correct way to perform the nested loop :
PROCEDURE fix()
BLOCK1: BEGIN
DECLARE colA_ INT;
DECLARE l_done INT DEFAULT 0;
DECLARE curs_colA CURSOR FOR SELECT DISTINCT colA FROM tableA;
DECLARE CONTINUE HANDLER FOR NOT FOUND SET l_done=1;
OPEN curs_colA;
first_loop : LOOP
FETCH curs_colA INTO colA_;
IF l_done=1 THEN LEAVE first_loop;
END IF;
BLOCK2: BEGIN
DECLARE calB_ INT;
DECLARE l_done INT DEFAULT 0;
DECLARE curs_calB CURSOR FOR SELECT DISTINCT calB FROM tableB WHERE colA = colA_;
DECLARE CONTINUE HANDLER FOR NOT FOUND SET l_done=1;
OPEN curs_calB;
second_loop : LOOP
FETCH curs_calB INTO calB_;
IF l_done=1 THEN LEAVE second_loop;
END IF;
insert into tmp value ('1');
END LOOP second_loop;
CLOSE curs_calB;
SET l_done=0;
END BLOCK2;
END LOOP first_loop;
CLOSE curs_colA;
END BLOCK1