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March 3, 2022 00:17
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Exemplo de Trigger com MariaDB
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-- EXEMPLO: | |
-- 1. CRIA TABELA PARA REGISTRAR LOGS | |
CREATE OR REPLACE TABLE TriggerLog(text varchar(200)) ENGINE=MyIsam; | |
-- 2. CRIA TABELA DE REGISTROS | |
CREATE OR REPLACE TABLE registros ( | |
id int(11) UNSIGNED AUTO_INCREMENT PRIMARY KEY, | |
cliente int NOT NULL, | |
valor varchar(80) COLLATE utf8_unicode_ci NOT NULL, | |
dia date COLLATE utf8_unicode_ci NOT NULL | |
) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci; | |
-- 3. CRIA TABELA DE DADOS | |
CREATE OR REPLACE TABLE dados ( | |
id int(11) UNSIGNED AUTO_INCREMENT PRIMARY KEY, | |
cliente int, | |
percentualdia varchar(80) COLLATE utf8_unicode_ci NOT NULL -- Alterei pra existir esse percentual dia invés dos calculos que vc tinha. | |
); | |
-- 4. CRIA TRIGGER (ESPECULADA) | |
-- Exemplo da Trigger de recalculo | |
CREATE OR REPLACE TRIGGER calculapercentual | |
AFTER INSERT ON registros | |
FOR EACH ROW | |
BEGIN | |
DECLARE percentualdianovo VARCHAR(70) DEFAULT ''; | |
DECLARE CalculoX NUMERIC(10,2) DEFAULT 0; | |
DECLARE StringId varchar(10); | |
DECLARE IdAnterior INT; | |
DECLARE StrIdAnterior VARCHAR(10); | |
SET StringId = CAST(NEW.id AS CHAR CHARACTER SET utf8); | |
Insert into TriggerLog(text) values(CONCAT("[", StringId,"] Iniciando registro.")); | |
SET IdAnterior = (SELECT MAX(id)-1 FROM registros WHERE cliente = NEW.cliente); | |
SET StrIdAnterior = CAST(IdAnterior AS CHAR CHARACTER SET utf8); | |
Insert into TriggerLog(text) values(CONCAT("[", StringId,"] ID ANTERIOR=",StrIdAnterior,".")); | |
SELECT valor INTO @percentualdiaant FROM registros WHERE id = IdAnterior; | |
Insert into TriggerLog(text) values(CONCAT("[", StringId,"] VALOR ENCONTRADO DIA ANTERIOR=",@percentualdiaant,".")); | |
SET percentualdianovo = NEW.valor; | |
Insert into TriggerLog(text) values(CONCAT("[", StringId,"] NOVO VALOR=",percentualdianovo,".")); | |
SET CalculoX = ((CAST(percentualdianovo as int)*100)/CAST(@percentualdiaant as int))-100; | |
Insert into TriggerLog(text) values(CONCAT("[", StringId,"] CALCULADO=",CalculoX,".")); | |
INSERT INTO dados (cliente, percentualdia) | |
values(NEW.cliente, CalculoX); | |
END; | |
-- 5. Insere registros de teste | |
select * from registros; | |
insert into registros(cliente, valor, dia) values(1, '50', '2022-03-01'); | |
insert into registros(cliente, valor, dia) values(1, '60', '2022-03-02'); | |
-- 6. Confere dado registrado | |
select * from dados; | |
-- truncate table dados; | |
-- 7. Confere dados do log | |
select * from TriggerLog; | |
-- truncate table TriggerLog; |
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