I have the following stored procedure in MySql..
main: BEGIN
DECLARE user_name VARCHAR(65);
DECLARE home_path VARCHAR(255);
DECLARE home_perm VARCHAR(10);
DECLARE num_posts, param_index INT(10);
SELECT `account`, `Posts`
INTO user_name, num_posts
FROM account_info
WHERE account = username_in AND password = password_in;
IF (user_name = NULL) OR (user_name != username_in) THEN
LEAVE main;
END IF;
SET home_perm = 'LRS';
IF num_posts > 100 THEN
SET param_index = 1;
SET home_path = 'c:\\folder_1';
ELSEIF num_posts > 200 THEN
SET param_index = 2;
SET home_path = 'c:\\folder_2';
ELSE
SET param_index = 0;
SET home_path = 'c:\\folder_0';
END IF;
SELECT home_path,home_perm,param_index;
END
When I test this procedure with a username that is incorrect I want it to "LEAVE main" but even if I do that it still does not enter LEAVE main, what can I do to fix this?
null value does not equal to anything, therefore both comparisons will return false. Use either the is null operator, or <=> operator to compare a variable with null.
user_name IS NULL
Related
a MYSQL user defined function selects a row from a table. How does the UDF code determine if the selected row was found in the table?
CREATE FUNCTION snippetFolder_folderPath(folder_id int)
RETURNS varchar(512)
BEGIN
declare vFolder_id int;
declare vParent_id int;
declare vPath varchar(512) default '';
declare vFolderName varchar(256) default '';
set vFolder_id = folder_id;
build_path:
while (vFolder_id > 0) do
/* -------- how to know this select statement returns a row?? ---------- */
select a.parent_id, a.folderName
into vParent_id, vFolderName
from SnippetFolder a
where a.folder_id = vFolder_id;
if vPath = ' ' then
set vPath = vFolderName;
else
set vPath = concat_ws( '/', vFolderName, vPath );
end if ;
set vFolder_id = vParent_id;
end while ;
return vPath;
END
https://dev.mysql.com/doc/refman/8.0/en/select-into.html says:
If the query returns no rows, a warning with error code 1329 occurs (No data), and the variable values remain unchanged.
So you could declare a continue handler on warnings, something like the example from the documentation:
BEGIN
DECLARE i INT DEFAULT 3;
DECLARE done INT DEFAULT FALSE;
retry:
REPEAT
BEGIN
DECLARE CONTINUE HANDLER FOR SQLWARNING
BEGIN
SET done = TRUE;
END;
IF done OR i < 0 THEN
LEAVE retry;
END IF;
SET i = i - 1;
END;
UNTIL FALSE END REPEAT;
END
I'll leave it to you to read the documentation and adapt that example to your table and your loop.
Alternatively, if you're using MySQL 8.0 you can use recursive common table expression:
CREATE FUNCTION snippetFolder_folderPath(vFolder_id int)
RETURNS varchar(512)
BEGIN
DECLARE vPath varchar(512) DEFAULT '';
WITH RECURSIVE cte AS (
SELECT folderName, parent_id, 0 AS height
FROM SnippetFolder WHERE folder_id = vFolder_id
UNION
SELECT f.folderName, f.parent_id, cte.height+1
FROM SnippetFolder AS f JOIN cte ON cte.parent_id = f.folder_id
)
SELECT GROUP_CONCAT(folderName ORDER BY height DESC SEPARATOR '/')
INTO vPath
FROM cte;
RETURN vPath;
END
The recursive CTE result is all the ancestors of the row matching vFolder_id, and then one can use GROUP_CONCAT() to concatenate them together as one string.
MyJsonArray
[{"ID":"D29","PersonID":"23616639"},{"ID":"D30","PersonID":"22629626"}]
and I want from sql Function set this array in to my Table but return null value in the variable and not set record in My database
my function:
DELIMITER $$
CREATE DEFINER=`toshiari`#`localhost` FUNCTION `setTitleRecords`(`Title` VARCHAR(166) CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci, `List` JSON) RETURNS int(4)
BEGIN
DECLARE Item INT;
DECLARE HolderLENGTH INT;
DECLARE ValidJson INT;
DECLARE ID VARCHAR(166);
DECLARE PersonID VARCHAR(166);
DECLARE S1 VARCHAR(166);
DECLARE S2 VARCHAR(166);
SET ValidJson = (SELECT JSON_VALID(List));
IF ValidJson = 1 THEN
SET HolderLENGTH = (SELECT JSON_LENGTH(List));
SET Item = 0;
WHILE Item < HolderLENGTH DO
SET S1 = CONCAT("'$[",Item, "].ID'");
SET S2 = CONCAT("'$[",Item, "].PersonID'");
SET ID = (SELECT JSON_EXTRACT(List,S1));
SET PersonID = (SELECT JSON_EXTRACT(List,S2));
INSERT INTO `Titles`(`ID`,`PersonID`,`Title`) VALUES (ID, PersonID, Title);
SET Item = Item + 1;
END WHILE;
RETURN 3;
ELSE
RETURN 2;
END IF;
END$$
DELIMITER ;
when I use this command in the Sql commands no problem and return true value
SELECT JSON_EXTRACT('[{"ID":"D29","PersonID":"23616639"},{"ID":"D30","PersonID":"22629626"}]','$[0].ID') return "D29"
return
"D29"
but in when run function from this code
return error and said:
SET #p0='DR'; SET #p1='[{\"ID\":\"D29\",\"PersonID\":\"23616639\"},{\"ID\":\"D30\",\"PersonID\":\"22629626\"}]'; SELECT `setTitleRecords`(#p0, #p1) AS `setTitleRecords`;
#4042 - Syntax error in JSON path in argument 2 to function 'json_extract' at position 1
I created a little test, in order to reproduce your issues. Basically you just need to redeclare S1 and S2, in the following way:
SET S1 = CONCAT('$[',Item,'].ID');
SET S2 = CONCAT('$[',Item,'].PersonID');
And that's it. You can check the test in the following url: https://www.db-fiddle.com/f/2TPgF868snjwcHN3uwoSEA/0
While trying to update a trigger, MySQL tells me the query ";" failed. How is ";" even a query in MySQL's view is beyond me.
The exact message is:
The following query has failed: ";" MySQL said: #1065 - Query was empty
Here's the new trigger (AFTER INSERT):
BEGIN
DECLARE vIdPlacet VARCHAR(40);
DECLARE vTypeTravaux VARCHAR(32);
DECLARE vEssence VARCHAR(3) DEFAULT '-';
DECLARE vClasseHau VARCHAR(5) DEFAULT '-';
DECLARE vNoMesurag int;
DECLARE new_id_parcelle INT UNSIGNED DEFAULT 0;
DECLARE new_no_microplacette INT UNSIGNED DEFAULT 0;
IF NEW.deleted = 0 THEN
SELECT id_parcelle, no_microplacette
INTO new_id_parcelle, new_no_microplacette
FROM microplacette
WHERE id_microplacette = NEW.id_microplacette;
SELECT travaux, no_mesurag, id__placet
INTO vTypeTravaux, vNoMesurag, vIdPlacet
FROM secteur
LEFT JOIN parcelle ON secteur.id_secteur = parcelle.id_secteur
WHERE id_parcelle = new_id_parcelle;
IF vTypeTravaux = 'inventaire' THEN
SELECT abbreviation INTO vEssence FROM essences WHERE _id = NEW.id_essence;
IF NEW.hauteur_15 = 1 THEN
SET vClasseHau = '15CM+';
END IF;
IF (SELECT COUNT(*) FROM imported_pres_ess WHERE id__placet = vIdPlacet AND
caracteris = '-' AND
classe_hau = vClasseHau AND
essence = vEssence AND
no_mesurag = vNoMesurag AND
no_micro_p = new_no_microplacette) = 0 THEN
INSERT INTO imported_pres_ess (id__placet, caracteris, classe_hau, essence, no_mesurag, no_micro_p)
VALUES (vIdPlacet, '-', vClasseHau, vEssence, vNoMesurag, new_no_microplacette);
END IF;
IF (SELECT COUNT(*) FROM imported_semi_gau WHERE id__placet = vIdPlacet AND
classe_hau = vClasseHau AND
essence = vEssence AND
no_mesurag = vNoMesurag AND
no_micro_p = new_no_microplacette) = 0 THEN
INSERT INTO imported_semi_gau (id__placet, classe_hau, essence, no_mesurag, no_micro_p)
VALUES (vIdPlacet, vClasseHau, vEssence, vNoMesurag, new_no_microplacette);
END IF;
IF NEW.diametre > 0 THEN
SET vClasseHau = 'D2_D8';
ELSE
SET vClasseHau = '-';
END IF;
IF (SELECT COUNT(*) FROM imported_pres_ess WHERE id__placet = vIdPlacet AND
caracteris = '-' AND
classe_hau = vClasseHau AND
essence = vEssence AND
no_mesurag = vNoMesurag AND
no_micro_p = new_no_microplacette) = 0 THEN
INSERT INTO imported_pres_ess (id__placet, caracteris, classe_hau, essence, no_mesurag, no_micro_p)
VALUES (vIdPlacet, '-', vClasseHau, vEssence, vNoMesurag, new_no_microplacette);
END IF;
IF (SELECT COUNT(*) FROM imported_semi_gau WHERE id__placet = vIdPlacet AND
classe_hau = vClasseHau AND
essence = vEssence AND
no_mesurag = vNoMesurag AND
no_micro_p = new_no_microplacette) = 0 THEN
INSERT INTO imported_semi_gau (id__placet, classe_hau, essence, no_mesurag, no_micro_p)
VALUES (vIdPlacet, vClasseHau, vEssence, vNoMesurag, new_no_microplacette);
END IF;
END IF;
END IF;
END
I tried creating the procedure you show, but I don't get any error.
The error about "empty statement" happens when you try to execute a query through the API but the query string is empty.
I can duplicate the error in the mysql client this way:
mysql> set #s = '';
mysql> prepare stmt from #s;
ERROR 1065 (42000): Query was empty
So I suggest you look not at the stored procedure, but whatever code you're executing this from, and check that every time you try to execute a query, that you submit a non-empty string.
It turns out, the trigger I was updating got deleted in the meantime, so I was updating a trigger that didn't exist anymore.
I found out after refreshing the page (the trigger was gone from the trigger list).
I simply recreated the trigger anew and it worked.
I am using following query to update all the children of particular topic.
UPDATE topics SET reuse = 0 WHERE topic_id IN (SELECT GetChildTopics(187));
Where
SELECT GetChildTopics(187);
returns "188,190,189" but my update query is updating only first row with topic_id = 188, instead of updating first topic only, it should update all 3 topics.
When I put the values manually it works fine.
UPDATE topics SET reuse = 0 WHERE topic_id IN (188,190,189);
Can anyone suggest what's wrong I am doing here?
Here is the code for GetChildTopics MySQL Function
CREATE DEFINER=`root`#`localhost` FUNCTION `GetAncestry`(GivenID INT) RETURNS varchar(1024) CHARSET latin1
DETERMINISTIC
BEGIN
DECLARE rv VARCHAR(1024);
DECLARE cm CHAR(1);
DECLARE ch INT;
SET rv = '';
SET cm = '';
SET ch = GivenID;
WHILE ch > 0 DO
SELECT IFNULL(parent_topic_id,-1) INTO ch FROM
(SELECT parent_topic_id FROM topic_list WHERE id = ch) A;
IF ch > 0 THEN
SET rv = CONCAT(rv,cm,ch);
SET cm = ',';
END IF;
END WHILE;
RETURN rv;
END
Try this;)
UPDATE topics SET reuse = 0 WHERE FIND_IN_SET(topic_id, GetChildTopics(187));
I have a procedure A which takes an array of strings. By calling another procedure B, i break this array in this format:
'1','2','3','4'
In case there is only one value, it just displays as '1'
I want to return * in case the array passed to the procedure A.
Therefore, my query will be like this: select * from users where userId(*);
What i want is that in case the parameter is null, it should still perform the IN using.
** EDIT **
Nothing much of query
CREATE DEFINER=`root`#`localhost` PROCEDURE `listAll`(IN id varchar(200))
BEGIN
set #t = lib_explode(',',id);
select * from city where ID in(#t);
END
Procedure B
CREATE DEFINER=`root`#`localhost` FUNCTION `lib_explode`(sSepar VARCHAR(255), saVal TEXT) RETURNS varchar(200) CHARSET utf8
body:
BEGIN
IF sSepar IS NULL OR saVal IS NULL THEN LEAVE body; END IF;
SET #saTail = saVal;
SET #iSeparLen = LENGTH( sSepar );
set #mystring = '';
set #current_pos = 1;
create_layers:
WHILE #saTail != '' DO
# Get the next value
SET #sHead = SUBSTRING_INDEX(#saTail, sSepar, 1);
SET #saTail = SUBSTRING( #saTail, LENGTH(#sHead) + 1 + #iSeparLen );
-- INSERT INTO lib_Explode SET val = #sHead;
if(#current_pos > 1) then
set #mystring = concat(#mystring,',',concat("'",#shead,"'"));
else
set #mystring = concat(#mystring,concat("'",#shead,"'"));
end if;
set #current_pos = #current_pos + 1;
END WHILE;
return #mystring;
END