मुझे DECLARE CONTINUE HANDLER
. के माध्यम से एक हैक मिला और GET DIAGNOSTICS CONDITION
, तो बस सोचा, मुझे इसे यहाँ साझा करना चाहिए।
यहां मेरी पूरी अंतिम स्क्रिप्ट है जो दोनों डेटाबेस users
के लिए बैकअप (सिंक) रखती है तालिका का अर्थ यह है कि test_db1
. पर कोई भी अपडेट (जिसे हम इसे प्रोडक्शनडीबी कह सकते हैं) test_db2
. पर होगा (जिसे हम इसे स्टेजिंगडीबी कह सकते हैं):
/*
Create two databases:
1. `test_db1`
2. `test_db2`
and execute below create *Table script* on both databases.
after that execute *Triggers Script* on `test_db1` only..
*/
/*
TABLE STRUCTURE FOR `users`
*/
DROP TABLE IF EXISTS `users`;
CREATE TABLE IF NOT EXISTS `users` (
`id` int(11) AUTO_INCREMENT NOT NULL,
`name` varchar(30) NOT NULL,
`age` int(11) NOT NULL,
PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=1 DEFAULT CHARSET=utf8;
/*
TABLE STRUCTURE FOR `errors`
*/
DROP TABLE IF EXISTS `errors`;
CREATE TABLE IF NOT EXISTS `errors` (
`id` int(11) AUTO_INCREMENT NOT NULL,
`code` varchar(30) NOT NULL,
`message` TEXT NOT NULL,
`query_type` varchar(50) NOT NULL,
`record_id` int(11) NOT NULL,
`on_db` varchar(50) NOT NULL,
`on_table` varchar(50) NOT NULL,
`emailed` TINYINT DEFAULT 0,
`created_at` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP,
PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=1 DEFAULT CHARSET=utf8;
/*
TRIGGERS SCRIPTS FOR INSERT, UPDATE AND DELETE OPERATIONS
*/
DELIMITER //
-- TRIGGER FOR INSERT
DROP TRIGGER IF EXISTS `test_db1_users_ai`;
CREATE TRIGGER `test_db1_users_ai` AFTER INSERT ON `users` FOR EACH ROW
BEGIN
-- Declare variables to hold diagnostics area information
DECLARE errorCode CHAR(5) DEFAULT '00000';
DECLARE errorMessage TEXT DEFAULT '';
-- Declare exception handler for failed insert
DECLARE CONTINUE HANDLER FOR SQLEXCEPTION
BEGIN
GET DIAGNOSTICS CONDITION 1
errorCode = RETURNED_SQLSTATE, errorMessage = MESSAGE_TEXT;
END;
-- Perform the insert
INSERT INTO `test_db2`.`users` (id, name, age) VALUES (NEW.id, NEW.name, NEW.age);
-- Check whether the insert was successful
IF errorCode != '00000' THEN
INSERT INTO `errors` (code, message, query_type, record_id, on_db, on_table) VALUES (errorCode, errorMessage, 'insert', NEW.id, 'test_db2', 'users');
END IF;
END; //
-- TRIGGER FOR UPDATE
DROP TRIGGER IF EXISTS `test_db1_users_au`;
CREATE TRIGGER `test_db1_users_au` AFTER UPDATE ON `users` FOR EACH ROW
BEGIN
-- Declare variables to hold diagnostics area information
DECLARE errorCode CHAR(5) DEFAULT '00000';
DECLARE errorMessage TEXT DEFAULT '';
-- Declare exception handler for failed insert
DECLARE CONTINUE HANDLER FOR SQLEXCEPTION
BEGIN
GET DIAGNOSTICS CONDITION 1
errorCode = RETURNED_SQLSTATE, errorMessage = MESSAGE_TEXT;
END;
-- Perform the update
UPDATE `test_db2`.`users`
SET name = NEW.name,
age = NEW.age
WHERE id = NEW.id;
-- Check whether the update was successful
IF errorCode != '00000' THEN
INSERT INTO `errors` (code, message, query_type, record_id, on_db, on_table) VALUES (errorCode, errorMessage, 'update', NEW.id, 'test_db2', 'users');
END IF;
END; //
-- TRIGGER FOR DELETE
DROP TRIGGER IF EXISTS `test_db1_users_ad`;
CREATE TRIGGER `test_db1_users_ad` AFTER DELETE ON `users` FOR EACH ROW
BEGIN
-- Declare variables to hold diagnostics area information
DECLARE errorCode CHAR(5) DEFAULT '00000';
DECLARE errorMessage TEXT DEFAULT '';
-- Declare exception handler for failed insert
DECLARE CONTINUE HANDLER FOR SQLEXCEPTION
BEGIN
GET DIAGNOSTICS CONDITION 1
errorCode = RETURNED_SQLSTATE, errorMessage = MESSAGE_TEXT;
END;
-- Perform the delete
DELETE FROM `test_db2`.`users`
WHERE id = OLD.id;
-- Check whether the insert was successful
IF errorCode != '00000' THEN
INSERT INTO `errors` (code, message, query_type, record_id, on_db, on_table) VALUES (errorCode, errorMessage, 'delete', OLD.id, 'test_db2', 'users');
END IF;
END; //
-- DELIMITER;
आशा है कि जब वे यहां आएंगे तो इससे दूसरों को मदद मिलेगी।
चीयर्स,