Mysql statement insert, if inserted, insert another - mysql

Question

I have the following statement:
INSERT INTO `Properties`(`Id`, `Url`, `BrokerId`, `LastFound`) VALUES
(#Id,#Url,#BrokerId,#LastFound)
ON DUPLICATE KEY UPDATE LastFoundOn = #LastFoundOn;
INSERT INTO `Events`(`Id`, `Type`, `DateTime`, `PropertyId`) VALUES
(#EventId,#EventType,#Now,#Id);
There is a foreign key constraint between Properties.Id and Events.PropertyId. And the Url is unique.
This works - almost. When a recod is not inserted, but updated because of duplicate key (Url), then the insert into event will fail, because the foreign key simply doesn't exist. Like this:
Eg:
exists: 1 | http://test1.com | 2 | 2013-03-13
to insert: 2 | http://test2.com | 2 | 2013-03-14
When trying to insert, it updates instead, because of the unique url. When afterwards trying to insert the event, a foreign key (2) doesn't exist in the Properties table. How can I make an if then statement to handle this scenario?
Something like (?):
INSERT INTO `Properties`(`Id`, `Url`, `BrokerId`, `LastFound`) VALUES
(#Id,#Url,#BrokerId,#LastFound)
ON DUPLICATE KEY UPDATE LastFoundOn = #LastFoundOn;
IF LastInserted = #Id THEN
INSERT INTO `Events`(`Id`, `Type`, `DateTime`, `PropertyId`) VALUES
(#EventId,#EventType,#Now,#Id);
END IF;
UPDATE:
A trigger might be the solution, but I'm struggeling making it work. What's wrong here?
DELIMITER $$
CREATE TRIGGER Event_Submitted_Trigger AFTER INSERT ON Properties
FOR EACH ROW
BEGIN
INSERT INTO Events VALUES(SELECT(UUID()), 'PropertySubmitted', SELECT(NOW()), new.Id);
END$$
I get the following error: #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 'SELECT(NOW()), new.Id); END$$' at line 4
Best regards,
Søren
UPDATE:
Here is my schema:
CREATE TABLE IF NOT EXISTS `Events` (
`Id` char(36) CHARACTER SET utf8 COLLATE utf8_bin NOT NULL,
`Type` enum('PropertySubmitted','PropertyChanged','PropertyRemoved') NOT NULL,
`DateTime` datetime NOT NULL,
`Attribute` varchar(128) NOT NULL,
`From` varchar(512) NOT NULL,
`To` varchar(512) NOT NULL,
`PropertyId` char(36) CHARACTER SET utf8 COLLATE utf8_bin NOT NULL,
PRIMARY KEY (`Id`),
KEY `IX_FK_PropertyEvent` (`PropertyId`),
KEY `DateTimeIndex` (`DateTime`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;
-- --------------------------------------------------------
--
-- Table structure for table `Properties`
--
CREATE TABLE IF NOT EXISTS `Properties` (
`Id` char(36) CHARACTER SET utf8 COLLATE utf8_bin NOT NULL,
`Url` varchar(255) CHARACTER SET utf8 COLLATE utf8_bin NOT NULL,
`Type` varchar(64) NOT NULL,
`ExtractedAddress` varchar(192) NOT NULL,
`ExtractedPostcode` varchar(8) NOT NULL,
`ExtractedCity` varchar(64) NOT NULL,
`StreetName` varchar(128) DEFAULT NULL,
`StreetNumber` varchar(8) DEFAULT NULL,
`Floor` varchar(8) DEFAULT NULL,
`Side` varchar(8) DEFAULT NULL,
`DoorNo` varchar(8) DEFAULT NULL,
`Postcode` int(4) DEFAULT NULL,
`City` varchar(64) DEFAULT NULL,
`Latitude` double DEFAULT NULL,
`Longitude` double DEFAULT NULL,
`ImageUrl` varchar(512) CHARACTER SET utf8 COLLATE utf8_bin DEFAULT NULL,
`Price` int(8) NOT NULL,
`Payout` int(8) NOT NULL,
`GrossPrice` int(6) NOT NULL,
`NetPrice` int(6) NOT NULL,
`Area` int(5) NOT NULL,
`GroundArea` int(5) NOT NULL,
`Rooms` int(2) NOT NULL,
`Year` int(4) NOT NULL,
`PriceChange` int(11) NOT NULL,
`FirstFoundOn` datetime NOT NULL,
`SubmittedOn` datetime NOT NULL,
`LastFoundOn` datetime NOT NULL,
`FoundAt` varchar(256) DEFAULT NULL,
`Validated` tinyint(1) NOT NULL,
`BrokerId` char(36) CHARACTER SET utf8 COLLATE utf8_bin NOT NULL,
`Archived` tinyint(1) NOT NULL DEFAULT '0',
PRIMARY KEY (`Id`),
UNIQUE KEY `Url` (`Url`),
KEY `IX_FK_PropertyBroker` (`BrokerId`),
KEY `UrlIndex` (`Url`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;
--
-- Triggers `Properties`
--
DROP TRIGGER IF EXISTS `Event_Submitted_Trigger`;
DELIMITER //
CREATE TRIGGER `Event_Submitted_Trigger` AFTER INSERT ON `Properties`
FOR EACH ROW BEGIN
INSERT INTO `Events` VALUES(UUID(), 'PropertySubmitted', NOW(), NEW.Id);
END
//
DELIMITER ;
--
-- Constraints for dumped tables
--
--
-- Constraints for table `Events`
--
ALTER TABLE `Events`
ADD CONSTRAINT `Events_ibfk_1` FOREIGN KEY (`PropertyId`) REFERENCES `Properties` (`Id`) ON DELETE CASCADE ON UPDATE CASCADE;
--
-- Constraints for table `Properties`
--
ALTER TABLE `Properties`
ADD CONSTRAINT `Properties_ibfk_2` FOREIGN KEY (`BrokerId`) REFERENCES `Brokers` (`Id`) ON DELETE NO ACTION ON UPDATE NO ACTION;

Answer 1

Assuming the following structure:
CREATE TABLE Properties (
id INT,
url VARCHAR(100),
lastFound DATETIME,
UNIQUE (url)
) ;
CREATE TABLE Events (
id VARCHAR(36),
type VARCHAR(20),
t DATETIME,
propertyId INT
) ;
Here is a working trigger:
DELIMITER $$
CREATE TRIGGER Event_Submitted_Trigger AFTER INSERT ON Properties
FOR EACH ROW BEGIN
INSERT INTO Events VALUES( UUID(), 'PropertySubmitted', NOW(), new.Id);
END $$
DELIMITER ;
See it in action here. Notice the NOW()+SLEEP(1) hack, only meant to delay execution in order to get a significant result (SLEEP() returns 0 if not interrupted).