MySQL hiyerarşik veri yardımı - Kapatma Tablosu Metodu

Question

Hiyerarşik verileri depolamak için MySQL'te bir sistem uygulamaya çalışıyorum. Bill Karwin tarafından açıklandığı gibi, 40 numaralı slayttan başlayarak uygulanan here sistemiyle devam etmeye karar verdim. Veritabanını kurmaya çalışıyorum, böylece EntryPaths tablosu otomatik olarak korunur.

Güncelleme: Veritabanı SQL'i biraz güncelledim. Bir güncelleme için 1-2 işim var, sanırım. Veritabanı SQL aşağıdaki

Öncelikle bu giriş nasıl göründüğünü görmek denemek oluşturmak çalıştırdıktan sonra

-- Example query to return a full library entry (0x02 is the entry iD) 
SELECT `Library`.* FROM `Library` 
LEFT JOIN `EntryPaths` ON `Library`.`iD` = `EntryPaths`.`descendant` 
WHERE `EntryPaths`.`ancestor` = 0x02 
ORDER BY `Library`.`subsectionOf`, `Library`.`subsectionOrder` 

Ve bu

-- Example query to return a full library entry (0x08 is the entry iD) 
SELECT `Library`.* FROM `Library` 
LEFT JOIN `EntryPaths` ON `Library`.`iD` = `EntryPaths`.`descendant` 
WHERE `EntryPaths`.`ancestor` = 0x08 
ORDER BY `Library`.`subsectionOf`, `Library`.`subsectionOrder` 

inceledi 1 giriş birkaç çocuğu var, ikinci hiçbir vardır nasıl göründüğünü çocuklar. Eğer ürün Jane Doe kaldırıldı olduğunu göreceksiniz Yukarıdaki iki seçme ifadeleri yeniden çalıştırılırsa ama onlar varsa John Doe

UPDATE `Library` SET `subsectionOf` = 0x08 WHERE `Library`.`iD` = 0x04; 

için 'Üniversite Yıl düğümü (ve çocukları) Reparent için aşağıdaki güncelleştirmeyi çalıştırın beklendiği gibi John Doe'a eklenmedi. Library_Update tetikleyicisi hatalıdır, ancak düzeltmeye çalışmak için fikirlerim tükeniyor. Eğer aşağıdaki satırı var Libary_Update tetikleyici INSERT açıklamada

-- MYSQL 
SET FOREIGN_KEY_CHECKS=0; 
DROP TRIGGER IF EXISTS Library_Insert; 
DROP TRIGGER IF EXISTS Library_Update; 
DROP TABLE IF EXISTS Users; 
DROP TABLE IF EXISTS Attributes; 
DROP TABLE IF EXISTS LibraryHistory; 
DROP TABLE IF EXISTS EntryPaths; 
DROP TABLE IF EXISTS Library; 
SET FOREIGN_KEY_CHECKS=1; 


CREATE TABLE `Users` (
    `iD`    VARBINARY(16) NOT NULL, -- UUID & PK 
    `libraryID`  VARBINARY(16),   -- Library UUID & FK (The library entry for this person) 
    `email`   NVARCHAR(255) NOT NULL, -- Email address 
    `nickname`  NVARCHAR(255) NOT NULL, -- Nickname used for display 
    `firstname`  NVARCHAR(255),   -- Real first name 
    `lastname`  NVARCHAR(255),   -- Real last name 
    `joinDate`  DATETIME NOT NULL,  -- Date the account was created 
    PRIMARY KEY (`iD`) 
) ENGINE = MYISAM; 


CREATE TABLE `Library` (
    `iD`    VARBINARY(16) NOT NULL, -- UUID & PK 
    `name`   NVARCHAR(500) NOT NULL, -- Name for the entry 
    `contentType`  NVARCHAR(50) NOT NULL, -- Mime type of data 
    `content`   LONGBLOB  NOT NULL, -- Data a for the entry 
    `subsectionOf` VARBINARY(16),   -- Library UUID & FK 
    `subsectionOrder` INT,      -- Oder of Subsections 
    `lastModifiedBy` VARBINARY(16),   -- User UUID & FK 
    `lastModified` DATETIME  NOT NULL, -- Last time the record was updated 
    PRIMARY KEY (`iD`), 
    FOREIGN KEY (`subsectionOf`) REFERENCES Library(`iD`) ON DELETE CASCADE, 
    FOREIGN KEY (`lastModifiedBy`) REFERENCES Users(`iD`), 
    INDEX(`name`) 
) ENGINE = MYISAM; 

-- Trigger to update the EntryPaths table for new entries 
DELIMITER // 
CREATE TRIGGER `Library_Insert` AFTER INSERT ON `Library` FOR EACH ROW 
BEGIN 
    INSERT INTO `EntryPaths` (`ancestor`, `descendant`, `len`) 
     SELECT `ancestor`, NEW.`iD`, len + 1 FROM `EntryPaths` 
      WHERE `descendant` = NEW.`subsectionOf` 
      UNION ALL SELECT NEW.`iD`, NEW.`iD`, 0; 
END; // 
DELIMITER ; 


DELIMITER // 
CREATE TRIGGER `Library_Update` BEFORE UPDATE ON `Library` FOR EACH ROW 
BEGIN 
    -- Add the old entry into the history table 
    INSERT INTO `LibraryHistory` VALUES(UNHEX(REPLACE(UUID(),'-','')), 
     OLD.`iD`, OLD.`name`, OLD.`contentType`, OLD.`content`, 
     OLD.`subsectionOf`, OLD.`subsectionOrder`, OLD.`lastModifiedBy`, 
     OLD.`lastModified`); 

    -- From http://www.mysqlperformanceblog.com/2011/02/14/moving-subtrees-in-closure-table/ 
    IF OLD.`subsectionOf` != NEW.`subsectionOf` THEN 
     -- Remove the node from its current parent 
     DELETE a FROM `EntryPaths` AS a 
     JOIN `EntryPaths` AS d ON a.`descendant` = d.`descendant` 
     LEFT JOIN `EntryPaths` AS x 
     ON x.`ancestor` = d.`ancestor` AND x.`descendant` = a.`ancestor` 
     WHERE d.`ancestor` = OLD.`iD` AND x.`ancestor` IS NULL; 

     -- Add the node to its new parent 
     -- FIXME: Not Working yet 
     INSERT `EntryPaths` (`ancestor`, `descendant`, `len`) 
     SELECT supertree.`ancestor`, subtree.`descendant`, supertree.`len`+subtree.`len`+1 
     FROM `EntryPaths` AS supertree JOIN `EntryPaths` AS subtree 
     WHERE subtree.`ancestor` = NEW.`iD` 
     AND supertree.`descendant` = NEW.`subsectionOf`; 
    END IF; 
END; // 
DELIMITER ; 


CREATE TABLE `EntryPaths` (
    `ancestor`  VARBINARY(16) NOT NULL, 
    `descendant` VARBINARY(16) NOT NULL, 
    `len`   VARBINARY(16) NOT NULL, 
    PRIMARY KEY (`ancestor`, `descendant`), 
    FOREIGN KEY (`ancestor`) REFERENCES Library(`iD`) ON DELETE CASCADE, 
    FOREIGN KEY (`descendant`) REFERENCES Library(`iD`) ON DELETE CASCADE 
) ENGINE = MYISAM; 


CREATE TABLE `LibraryHistory` (
    `iD`    VARBINARY(16) NOT NULL, -- UUID & PK 
    `libraryID`  VARBINARY(16) NOT NULL, -- Library UUID & FK 
    `name`   NVARCHAR(500) NOT NULL, -- Name for the entry 
    `contentType`  NVARCHAR(50) NOT NULL, -- Mime type of data 
    `content`   LONGBLOB  NOT NULL, -- Data a for the entry 
    `subsectionOf` VARBINARY(16),   -- Library UUID & FK 
    `subsectionOrder` INT,      -- Oder of Subsections 
    `lastModifiedBy` VARBINARY(16),   -- User UUID & FK 
    `lastModified` DATETIME  NOT NULL, -- Last time the record was updated 
    PRIMARY KEY (`iD`), 
    FOREIGN KEY (`libraryID`) REFERENCES Library(`iD`) ON DELETE CASCADE, 
    FOREIGN KEY (`lastModifiedBy`) REFERENCES Users(`iD`) 
) ENGINE = MYISAM; 


CREATE TABLE `Attributes` (
    `iD`    VARBINARY(16) NOT NULL, -- UUID & PK (Potentially could be removed) 
    `libraryID`  VARBINARY(16) NOT NULL, -- Library UUID & FK 
    `name`   NVARCHAR(500) NOT NULL, -- Name of attribute 
    `dataType`  INT   NOT NULL, -- The type of data the attribute holds (int, date, string, etc.) 
    `data`   NVARCHAR(500) NOT NULL, -- Value of attribute 
    `lastModifiedBy` VARBINARY(16),   -- User UUID & FK 
    `lastModified` DATETIME  NOT NULL, -- Last time the record was updated 
    PRIMARY KEY (`iD`), 
    FOREIGN KEY (`libraryID`) REFERENCES Library(`iD`) ON DELETE CASCADE, 
    INDEX (`name`) 
) ENGINE = MYISAM; 

ALTER TABLE `Users` ADD CONSTRAINT FK_User_Library FOREIGN KEY (`libraryID`) REFERENCES Library(`iD`); 

-- Example Data 
INSERT INTO `Library` VALUES(0x01, 'People', 'text/plain', 'Lorem ipsum dolor sit amet, consectetur adipiscing elit. Nam pulvinar scelerisque quam, vel convallis turpis porttitor in. Curabitur pulvinar fermentum pulvinar. Mauris lorem lacus, gravida porta lacinia vitae, dictum ac eros. Aliquam magna arcu, lacinia ac dictum sed, euismod eu elit. Sed semper nulla at velit pulvinar in vehicula risus tempus. Phasellus id nisl libero, id porttitor purus. Integer aliquet semper aliquam. Morbi elit mi, pellentesque et ornare nec, iaculis gravida elit. Sed in luctus lorem. Maecenas a purus at lectus condimentum congue.', NULL, NULL, NULL, '2011-11-16 20:27:54'); 
INSERT INTO `Library` VALUES(0x02, 'Jane Doe', 'text/x-markup', 'Lorem ipsum dolor sit amet, consectetur adipiscing elit. Nam pulvinar scelerisque quam, vel convallis turpis porttitor in. Curabitur pulvinar fermentum pulvinar. Mauris lorem lacus, gravida porta lacinia vitae, dictum ac eros. Aliquam magna arcu, lacinia ac dictum sed, euismod eu elit. Sed semper nulla at velit pulvinar in vehicula risus tempus. Phasellus id nisl libero, id porttitor purus. Integer aliquet semper aliquam. Morbi elit mi, pellentesque et ornare nec, iaculis gravida elit. Sed in luctus lorem. Maecenas a purus at lectus condimentum congue.', NULL, NULL, NULL, '2011-11-16 20:29:13'); 
INSERT INTO `Library` VALUES(0x03, 'Younger Years', 'text/x-markup', 'Lorem ipsum dolor sit amet, consectetur adipiscing elit. Nam pulvinar scelerisque quam, vel convallis turpis porttitor in. Curabitur pulvinar fermentum pulvinar. Mauris lorem lacus, gravida porta lacinia vitae, dictum ac eros. Aliquam magna arcu, lacinia ac dictum sed, euismod eu elit. Sed semper nulla at velit pulvinar in vehicula risus tempus. Phasellus id nisl libero, id porttitor purus. Integer aliquet semper aliquam. Morbi elit mi, pellentesque et ornare nec, iaculis gravida elit. Sed in luctus lorem. Maecenas a purus at lectus condimentum congue.', 0x02, 1, NULL, '2011-11-16 00:00:00'); 
INSERT INTO `Library` VALUES(0x04, 'College Years', 'text/x-markup', 'Lorem ipsum dolor sit amet, consectetur adipiscing elit. Nam pulvinar scelerisque quam, vel convallis turpis porttitor in. Curabitur pulvinar fermentum pulvinar. Mauris lorem lacus, gravida porta lacinia vitae, dictum ac eros. Aliquam magna arcu, lacinia ac dictum sed, euismod eu elit. Sed semper nulla at velit pulvinar in vehicula risus tempus. Phasellus id nisl libero, id porttitor purus. Integer aliquet semper aliquam. Morbi elit mi, pellentesque et ornare nec, iaculis gravida elit. Sed in luctus lorem. Maecenas a purus at lectus condimentum congue.', 0x02, 2, NULL, '2011-11-16 20:31:52'); 
INSERT INTO `Library` VALUES(0x05, 'Yale', 'text/x-markup', 'Lorem ipsum dolor sit amet, consectetur adipiscing elit. Nam pulvinar scelerisque quam, vel convallis turpis porttitor in. Curabitur pulvinar fermentum pulvinar. Mauris lorem lacus, gravida porta lacinia vitae, dictum ac eros. Aliquam magna arcu, lacinia ac dictum sed, euismod eu elit. Sed semper nulla at velit pulvinar in vehicula risus tempus. Phasellus id nisl libero, id porttitor purus. Integer aliquet semper aliquam. Morbi elit mi, pellentesque et ornare nec, iaculis gravida elit. Sed in luctus lorem. Maecenas a purus at lectus condimentum congue.', 0x04, 2, NULL, '2011-11-16 20:32:44'); 
INSERT INTO `Library` VALUES(0x06, 'Old Age', 'text/x-markup', 'Lorem ipsum dolor sit amet, consectetur adipiscing elit. Nam pulvinar find me here scelerisque quam, vel convallis turpis porttitor in. Curabitur pulvinar fermentum pulvinar. Mauris lorem lacus, gravida porta lacinia vitae, dictum ac eros. Aliquam magna arcu, lacinia ac dictum sed, euismod eu elit. Sed semper nulla at velit pulvinar in vehicula risus tempus. Phasellus id nisl libero, id porttitor purus. Integer aliquet semper aliquam. Morbi elit mi, pellentesque et ornare nec, iaculis gravida elit. Sed in luctus lorem. Maecenas a purus at lectus condimentum congue.', 0x02, 3, NULL, '2011-11-16 20:31:52'); 
INSERT INTO `Library` VALUES(0x07, 'Community College', 'text/x-markup', 'Lorem ipsum dolor sit amet, consectetur adipiscing elit. Nam pulvinar scelerisque quam, vel convallis turpis porttitor in. Curabitur pulvinar fermentum pulvinar. Mauris lorem lacus, gravida porta lacinia vitae, dictum ac eros. Aliquam magna arcu, lacinia ac dictum sed, euismod eu elit. Sed semper nulla at velit pulvinar in vehicula risus tempus. Phasellus id nisl libero, id porttitor purus. Integer aliquet semper aliquam. Morbi elit mi, pellentesque et ornare nec, iaculis gravida elit. Sed in luctus lorem. Maecenas a purus at lectus condimentum congue.', 0x04, 1, NULL, '2011-11-16 20:33:11'); 
INSERT INTO `Library` VALUES(0x08, 'John Doe', 'text/x-markup', 'Lorem ipsum dolor sit amet, consectetur adipiscing elit. Nam pulvinar scelerisque quam, vel convallis turpis porttitor in. Curabitur pulvinar fermentum pulvinar. Mauris lorem lacus, gravida porta lacinia vitae, dictum ac eros. Aliquam magna arcu, lacinia ac dictum sed, euismod eu elit. Sed semper nulla at velit pulvinar in vehicula risus tempus. Phasellus id nisl libero, id porttitor purus. Integer aliquet semper aliquam. Morbi elit mi, pellentesque et ornare nec, iaculis gravida elit. Sed in luctus lorem. Maecenas a purus at lectus condimentum congue.', NULL, NULL, NULL, '2011-11-16 20:34:40'); 
INSERT INTO `Library` VALUES(0x09, 'Planets', 'text/x-markup', 'Lorem ipsum dolor sit amet, consectetur adipiscing elit. Nam pulvinar scelerisque quam, vel convallis turpis porttitor in. Curabitur pulvinar fermentum pulvinar. Mauris lorem lacus, gravida porta lacinia vitae, dictum ac eros. Aliquam magna arcu, lacinia ac dictum sed, euismod eu elit. Sed semper nulla at velit pulvinar in vehicula risus tempus. Phasellus id nisl libero, id porttitor purus. Integer aliquet semper aliquam. Morbi elit mi, pellentesque et ornare nec, iaculis gravida elit. Sed in luctus lorem. Maecenas a purus at lectus condimentum congue.', NULL, NULL, NULL, '2011-11-16 20:27:54'); 
INSERT INTO `Library` VALUES(0x10, 'Earth', 'text/x-markup', 'Lorem ipsum dolor sit amet, consectetur adipiscing elit. Nam pulvinar scelerisque quam, vel convallis turpis porttitor in. Curabitur pulvinar fermentum pulvinar. Mauris lorem lacus, gravida porta lacinia vitae, dictum ac eros. Aliquam magna arcu, lacinia ac dictum sed, euismod eu elit. Sed semper nulla at velit pulvinar in vehicula risus tempus. Phasellus id nisl libero, id porttitor purus. Integer aliquet semper aliquam. Morbi elit mi, pellentesque et ornare nec, iaculis gravida elit. Sed in luctus lorem. Maecenas a purus at lectus condimentum congue.', NULL, NULL, NULL, '2011-11-16 20:27:54'); 
INSERT INTO `Library` VALUES(0x11, 'Mars', 'text/x-markup', 'Lorem ipsum dolor sit amet, consectetur adipiscing elit. Nam pulvinar scelerisque quam, vel convallis turpis porttitor in. Curabitur pulvinar fermentum pulvinar. Mauris lorem lacus, gravida porta lacinia vitae, dictum ac eros. Aliquam magna arcu, lacinia ac dictum sed, euismod eu elit. Sed semper nulla at velit pulvinar in vehicula risus tempus. Phasellus id nisl libero, id porttitor purus. Integer aliquet semper aliquam. Morbi elit mi, pellentesque et ornare nec, iaculis gravida elit. Sed in luctus lorem. Maecenas a purus at lectus condimentum congue.', NULL, NULL, NULL, '2011-11-16 20:27:54'); 
INSERT INTO `Attributes` VALUES(0x01, 0x02, 'TypeOf', 1, 0x01, NULL, '2011-11-16 20:34:40'); 
INSERT INTO `Attributes` VALUES(0x02, 0x02, 'BirthDate', 2, '19770521', NULL, '2011-11-16 20:34:40'); 
INSERT INTO `Attributes` VALUES(0x03, 0x02, 'EyeColor', 3, 'Brown', NULL, '2011-11-16 20:34:40'); 
INSERT INTO `Attributes` VALUES(0x04, 0x08, 'TypeOf', 1, 0x01, NULL, '2011-11-16 20:34:40'); 
INSERT INTO `Attributes` VALUES(0x05, 0x08, 'BirthDate', 2, '19740521', NULL, '2011-11-16 20:34:40'); 
INSERT INTO `Attributes` VALUES(0x06, 0x10, 'TypeOf', 1, 0x08, NULL, '2011-11-16 20:34:40'); 
INSERT INTO `Attributes` VALUES(0x07, 0x11, 'TypeOf', 1, 0x08, NULL, '2011-11-16 20:34:40'); 

Answer 1

:

veritabanı örnek verilerle SQL oluşturmak

WHERE subtree.`ancestor` = NEW.`iD` 

ancak bunu kimlik alanını güncellenmiyor Ben bir NEW.iD değerine sahip olacağını sanmıyorum. Bu satırın yerine OLD.iD kullanılmalı mı?