I write a procedure for MariaDB. I need to verify correct code.
DELIMITER //
CREATE PROCEDURE verifyInsert (IN value TINYTEXT)
BEGIN
IF NOT EXISTS (SELECT `table1`.Column1 FROM `table1`
WHERE `column1` = valore)
then INSERT INTO `table1`(`column1`) VALUES (value)
END IF;
END;
// DELIMITER;
This procedure must be verify if an inserted value is present.
If yes i do not anything else it insert in my database.
Someone could verify my code please?
As said, make unique column. And you can use
INSERT IGNORE INTO
so you just "eat" the error and go on as planned.
Related
I am very new in Mysql, probably don't know or don't understand something essential.
Could you please advise me why 'begin !!!' message is not inserted in this
case?
DELIMITER $$
CREATE TABLE `_debugLogTable` (
`Message` varchar(255) DEFAULT NULL
) ENGINE=InnoDB $$
CREATE PROCEDURE `debug_msg`(msg VARCHAR(255))
BEGIN
insert into _debugLogTable select msg;
END$$
CREATE FUNCTION `ValueMeetsCondition`(value varchar(20)) RETURNS tinyint(1)
BEGIN
DECLARE ConditionValue INTEGER;
call debug_msg('begin !!!');
SET ConditionValue = CAST(`value` AS UNSIGNED);
call debug_msg('end !!!');
RETURN TRUE;
END$$
DELIMITER ;
I am aware that CAST function fails, but why call debug_msg('begin !!!'); does not insert new record into table?! There are not any transactions there!
Just want post an answer, maybe it will help somebody in the future.
From this we have -
If autocommit mode is enabled, each SQL statement forms a single transaction on its own. By default, MySQL starts the session for each new connection with autocommit enabled, so MySQL does a commit after each SQL statement if that statement did not return an error. If a statement returns an error, the commit or rollback behavior depends on the error
I call function in this way - select ValueMeetsCondition('>10').
So actually it is wrapped into transaction by MySQL, that's why if something inside my procedure fails - the whole changes are roll backed.
If i remake my query in this way the message begin !! will be inserted, while end !! does not
call debug_msg('begin !!!');
SET ConditionValue = CAST(`>10` AS UNSIGNED);
select ConditionValue;
call debug_msg('end !!!');
I'm trying to create a stored procedure in heidisql (mysql).
CREATE PROCEDURE SP_FORM20_POST(
P_SESSIONID VARCHAR(256)
)
BEGIN
INSERT INTO tbForm20
( SESSIONID, RegDT)
VALUES
( P_SESSIONID, NOW());
END
This is my query. I'm trying to create this procedure, but occur some error:
Error code is 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 8".
However, I don't know wrong syntax. What is wrong?
I want to success in heidisql tool. I don't want other db tool.
Please help me.
The problem in that query is the semicolon, which is the default query delimiter.
In order to change the delimiter in HeidiSQL, add the DELIMITER client command above the CREATE PROCEDURE query:
DELIMITER \\
SELECT 1\\
CREATE PROCEDURE ...\\
DELIMITER ;
HeidiSQL also has a procedure designer, with no need to set the delimiter:
The problem is this. The database reads the ; in your code as an end of the procedure. You probably don't intend it like that :). The DELIMITER command takes care of that by changing ; to something customizable, like $$. Try this:
DELIMITER $$
CREATE PROCEDURE SP_FORM20_POST(
P_SESSIONID VARCHAR(256)
)
BEGIN
INSERT INTO tbForm20
( SESSIONID, RegDT)
VALUES
( P_SESSIONID, NOW());
END$$
DELIMITER ;
Try this one
DELIMITER //
CREATE PROCEDURE SP_FORM20_POST(
P_SESSIONID VARCHAR(256)
)
BEGIN
INSERT INTO tbForm20
( SESSIONID, RegDT)
VALUES
( P_SESSIONID, NOW());
END //
DELIMITER;
I have a trigger and stored procedure. In the stored procedure I validate an IPv4 address. If the address is valid it is saved to DB. If not my program saves empty record in the DB. I want to make it so whenever the IP is not valid - nothing to be saved. I don't know how to stop the process when ip is not valid. I know that validation should not be provided at DB level but this is the requirement. Could you help me fixing my code... ? Thanks :)
DELIMITER $$
CREATE TRIGGER `validation_test_trigger` BEFORE INSERT ON setting_parameters
FOR EACH ROW
BEGIN
IF(NEW.parameter_name LIKE 'proxy_test') = true THEN
CALL validate_ip(NEW.parameter_value);
end IF;
END$$
DELIMITER ;
DROP PROCEDURE IF EXISTS validate_ip;
DELIMITER //
CREATE PROCEDURE validate_ip(INOUT ip VARCHAR(45))
BEGIN
select INET_NTOA(INET_ATON(ip)) into ip;
IF(ip REGEXP '^([1-9]|[1-9][0-9]|1[013-9][0-9]|12[0-689]|2[0-4][1-9]|25[0-4])\.(([0-9]|[1-9][0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5])\.){2}([1-9]|[1-9][0-9]|1[0-9]{2}|2[0-4][1-9]|25[0-4])$')=0
THEN
SIGNAL SQLSTATE '12345'
SET MESSAGE_TEXT = 'Invalid IP!';
END IF;
END //
DELIMITER ;
instead of a procedure, create a function that returns 0 if the IP is correct or 1 of not.
create a table b_setting_parameters like setting_parameters but with ENGINE=BLACKHOLE. That will create a table which discards everything that is inserted into it (like /dev/null)
create the insert trigger on that blackhole table:
CREATE TRIGGER validation_test_trigger BEFORE INSERT ON b_setting_parameters
FOR EACH ROW
BEGIN
IF validate_ip(NEW.parameter_value) = 0 THEN
INSERT INTO setting_parameters(col1, col2,...)
VALUES (NEW.col1, NEW.col2,...)
END IF;
END$$
now you have to insert into the table b_setting_parameters instead of setting_parameters and it will do the trick.
As you have stated, this should not be done at the DB level - I don't believe that MySQL Triggers allow the prevention of an INSERT or UPDATE.
The only way I could see this succeeding is for your Trigger to alter the data so that MySQL cannot insert it... but given that MySQL often manipulates data to fit the table defintion, I'm not sure that will work.
I need to utilize two insert statements in a single procedure in order to update a master and detail table, so I'm trying to use the delimiter keyword for this to work. I'm using phpMyAdmin 3.5.8, client libmysql - 5.0.96, and mysql 5.1.70. I've tried all sorts of syntax, but none seem to work. This is my query:
DELIMITER //
CREATE PROCEDURE `agregarPrincipio` (IN ID_PRODUCTO INT UNSIGNED, IN DESCR VARCHAR(100))
BEGIN
START TRANSACTION;
INSERT INTO `TM_PRINCIPIO_ACTIVO` (`DESCRIPCION`) VALUES(DESCR);
INSERT INTO TD_PRINCIPIO_ACTIVO(`ID_TD_PRINCIPIO_ACTIVO`,`ID_TM_PRINCIPIO_ACTIVO`) VALUES(ID_PRODUCTO,LAST_INSERT_ID());
COMMIT;
END
//
DELIMITER ;
Any ideas on what may be happening?
the problem is in the line
INSERT INTO TD_PRINCIPIO_ACTIVO(`ID_TD_PRINCIPIO_ACTIVO`,`ID_TM_PRINCIPIO_ACTIVO`) VALUES(ID_PRODUCTO,LAST_INSERT_ID());
. You are trying to directly call a stored procedure LAST_INSERT_ID() in your second select statement. If LAST_INSERT_ID() returns a single value, try to save it in a variable. Then use that variable
DECLARE last_id int default 0;
SET last_id= SELECT LAST_INSERT_ID(); #if it is a function other wise use exec
INSERT INTO TD_PRINCIPIO_ACTIVO(`ID_TD_PRINCIPIO_ACTIVO`,`ID_TM_PRINCIPIO_ACTIVO`) VALUES(ID_PRODUCTO,last_id);
ALTER TABLE aspnet_Paths ALTER PathId SET DEFAULT UUID();
I've ran a converter program on "generate" scripts from a SQL Server database.
I seem to be having uuid in the above statement highlighted in work benches query window with the statement "Error Syntax near uuid()",
I'm moving to MySQL. What's the correct implementation of this statement?
Any help/advise is much appreciated
Try to use a BEFORE INSERT trigger -
DELIMITER $$
CREATE TRIGGER trigger1
BEFORE INSERT
ON aspnet_paths
FOR EACH ROW
BEGIN
IF NEW.PathId IS NULL THEN
SET NEW.PathId = UUID();
END IF;
END
$$
DELIMITER ;