I have the following query that loops over chunks of data and copy it to another table. One of my goals for using label is to have a mechanism to exit from the loop once some condition are met:
SET #nth = 0;
SET #size = 1000 * 1;
SET #offset = #nth * #size;
SET #count = 7120;
lable1: LOOP
PREPARE select_stmt FROM
"INSERT INTO foo.`track_new` (
`...`
)
SELECT
`...`
FROM foo.`track` a
WHERE ...
ORDER BY ...
LIMIT ?, ?";
EXECUTE select_stmt USING #offset, #size;
IF #offset + #size > #count THEN LEAVE lable1;
END IF;
...
END LOOP;
but I am getting these errors (messages for successful queries were removed):
Query: lable1: LOOP PREPARE select_stmt FROM "INSERT INTO gps.`track_new` ( `id`, `unit_id`, `gps_time`, `added_when`, `latit...
Error Code: 1064
You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'lable1: LOOP
PREPARE select_stmt FROM
"INSERT INTO gps.`track_new` (
`id`,
' at line 1
Execution Time : 0 sec
Transfer Time : 0 sec
Total Time : 0 sec
--------------------------------------------------
...
Query: IF #offset + #size > #count THEN leave lable1
Error Code: 1064
You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'IF #offset + #size > #count THEN leave lable1' at line 1
Execution Time : 0 sec
Transfer Time : 0 sec
Total Time : 0 sec
--------------------------------------------------
I have already checked for the syntax of label and it seems fine.
I have also checked for the syntax for loops and other control structures in mysql but I can't figure what's wrong.
EDIT:
I have noticed that the line EXECUTE select_stmt USING #offset, #size; gets executed but the Loop does not repeat afterwards.
Related
I am trying to write a Mysql query . I am getting some error on WITH clause of select function .
This is the sample query :
CREATE TRIGGER SAMPLE BEFORE INSERT ON SERVER
FOR EACH ROW
BEGIN
IF ((SELECT COUNT(S.ID) FROM SERVER S WITH UR) >= (SELECT L.SERVERS FROM SAMPLE L WHERE L.ID = 1 LIMIT 1)) THEN
SIGNAL SQLSTATE '73550' SET MESSAGE_TEXT='+ID';
END IF;
END;
and i am getting the error :
right syntax to use near 'UR) >= (SELECT L.SERVERS FROM SAMPLE L WHERE L.ID = 1 LIMIT 1))
Is WITH clause doesn't support in Mysql ? Or any other syntax should i use ? Any suggestion would helpful .
update :
Also i am using another query :
CREATE TRIGGER SAMPLE_TRIGGER NO CASCADE BEFORE INSERT ON TABLE_1
FOR EACH ROW
BEGIN
SET NEW.RID = (SELECT ID FROM TABLE_2 WHERE ACTIVE=0 FETCH FIRST 1 ROWS ONLY WITH RS USE AND KEEP EXCLUSIVE LOCKS);
IF (NEW.RID IS NULL) THEN
SIGNAL SQLSTATE '73550' SET MESSAGE_TEXT='+ID';
END IF;
END;
getting another error
right syntax to use near 'LIMIT 1 WITH RS USE AND KEEP EXCLUSIVE LOCKS);
IF (NEW.RID IS NULL) THEN'
In DB2, with ur means "with uncommitted read". This is a locking mechanism in the database, as explained here.
If you are porting code to MySQL, I would not worry about this. So, just remove it:
CREATE TRIGGER SAMPLE BEFORE INSERT ON SERVER
FOR EACH ROW
BEGIN
IF ((SELECT COUNT(S.ID) FROM SERVER S) >= (SELECT L.SERVERS FROM SAMPLE L WHERE L.ID = 1 LIMIT 1)) THEN
SIGNAL SQLSTATE '73550' SET MESSAGE_TEXT='+ID';
END IF;
END;
I have written this code and I am getting:
incorrect syntax near '#vartablename'.
Declare #vartablename char;
While (Select Count(*) From TABLENAMES Where processed=0) > 0
Begin
select * into #vartablename FROM openquery([PROGENYREAD],'select * from #vartablename ');
Update TABLENAMES Set Processed = 1 Where table_name = #vartablename;
End
I am trying to create custom id for my table in the following format
2 random alphabets - 00MaxID
for e.g: AA-001
I have tried writing a query for it but it is not working, this is my first time writing a trigger also writing a complex query such as this.
UPDATED-2
the following query gives me an error near "SELECT count(cus_id) INTO #ct FROM customer;"
CREATE
TRIGGER `id_gen` BEFORE INSERT
ON `testdb`.`customer`
FOR EACH ROW BEGIN
SELECT count(cus_id) INTO #ct FROM customer;
IF #ct < 1000 THEN
SET #cs_id = LPAD(#ct+1, 3, 0 );
ELSE
SET #cs_id = #ct+1;
END IF;
SET NEW.cus_id = CONCAT(CHAR(FLOOR(65 + RAND() * 26),FLOOR(65 + RAND() * 26)),'-',#cs_id);
END;
Error
SQL query: Documentation
CREATE
TRIGGER `id_gen` BEFORE INSERT
ON `testdb`.`customer`
FOR EACH ROW BEGIN
SELECT count(cus_id) INTO #ct FROM customer
MySQL said: Documentation
#1064 - You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near '' at line 6
Executing with Trigger Section
Answered by #Solarflare.
In the screenshot, you can see that phpmyadmin automatically added code including for each row, which is now twice in the statement (thus the error). Your own code will start with begin.
BEGIN
SELECT count(cus_id)+1 INTO #ct FROM customer;
IF #ct < 1000 THEN
SET #cs_id = LPAD(#ct, 3, 0 );
ELSE
SET #cs_id = #ct;
END IF;
SET NEW.cus_id = CONCAT(CHAR(FLOOR(65 + RAND() * 26),FLOOR(65 + RAND() * 26)),'-',#cs_id);
END;
I am trying to make this If Statement work, but I can't seem to make it do what I want. If I do a select #result, It'll give me the value 0, then why doesn't the IF statement work?
SET #message = '((sometihng here))';
select LEFT(#message, 1) into #firstChar;
select STRCMP(#firstChar,'(') into #result;
IF (#result = 0) THEN
SET #message = 'true';
//more selects and cals here;
END IF;
select #message;
I should get true, but I don't it shows me an error:
SQL query: IF( #result =0 ) THEN SET #message = 'true';
MySQL said:
1064 - You have an error in your SQL syntax; check the manual that
corresponds to your MySQL server version for the right syntax to use
near 'IF (#result = 0) THEN SET #message = 'true'' at line 1
try use function http://dev.mysql.com/doc/refman/5.0/en/control-flow-functions.html#function_if
SELECT IF(#result = 0, 'true', '((something here))') AS message
As Max Mara pointed out, that's a good work aroud. The reason the IF wasn't working is not because the syntax is incorrect, but because flow control functions like IF ... THEN are only valid inside of stored procedures or functions, All this thanks to #TehShrike
The IF .. THEN .. ELSE syntax in MySQL is only available for procedural code (stored precudures, functions, triggers..), but not for SELECT statements.
IF ELSE USED IN STORED PROCEDURE EXAMPLE BELOW
DELIMITER //
CREATE PROCEDURE NAME(IN Number INT)
BEGIN
IF roll= 1
THEN SELECT * FROM table1 WHERE id = roll;
ELSE
SELECT * FROM table2 WHERE id = 2;
END IF;
END //
DELIMITER ;
I have some stored procedures and a trigger that work great in MySQL 5.5.8 but for some reason don't work in 5.1. The error descriptions aren't enough for me to figure out the problem. Here is the code and the errors.
CREATE PROCEDURE `cg_getMatchingContent`(
MatchTerm VARCHAR(255),
MaxResults INT)
BEGIN
SELECT * FROM (
SELECT t.*, INSTR(t.`Title`,MatchTerm) as Pos
FROM cg_content t ) c
WHERE Pos>0 ORDER BY Pos LIMIT 0, MaxResults;
END
Error: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'MaxResults' at line 8
DELIMITER ;;
CREATE TRIGGER `cg`.`cg_content_UrlDup_ConstTrig`
BEFORE INSERT ON `cg`.`cg_content`
FOR EACH ROW
Begin
DECLARE errorString VARCHAR(500);
DECLARE insert_error CONDITION FOR SQLSTATE '99001';
IF new.Url = '' THEN
SET errorString = CONCAT('Url cannot be blank
Title: ' , new.Title);
SIGNAL insert_error
SET MESSAGE_TEXT=errorString;
END if;
IF Exists(SELECT id FROM cg.cg_content WHERE Url=new.Url) THEN
SET errorString = CONCAT('Url is not unique
Title: ' , new.Title , '
Url: ' + new.Url);
SIGNAL insert_error
SET MESSAGE_TEXT=errorString;
End if;
End ;;
Error: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'insert_error
SET MESSAGE_TEXT=errorString;END if;IF ' at line 10
From the docs:
Within stored programs, LIMIT parameters can be specified using integer-valued routine parameters or local variables as of MySQL 5.5.6.
5.1 does not support variables in LIMIT and OFFSET.
The second one is easy to figure, hard to fix. SIGNAL and RESIGNAL commands were introduced in MySQL 5.5. You can't convert it easily to 5.1. One way to do it, would be to run a query that errors. For example a SELECT from a non-existent table.