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I am trying to convert a complex oracle sql procedure to mysql. The procedure contains of many differenct selects, cursors etc. I already wrote a version of it in mysql, but it does not work and only gives some error messages. I hope on could help me.
Tables
CREATE TABLE IF NOT EXISTS `NutritionalInformation`
(
`idNuIn` INT NOT NULL PRIMARY KEY AUTO_INCREMENT,
`calories` FLOAT NULL,
`saturatedFat` FLOAT NULL,
`transFat` FLOAT NULL,
`carbohydrates` FLOAT NULL,
`sugar` FLOAT NULL,
`protein` FLOAT NULL,
`salt` FLOAT NULL
);
CREATE TABLE IF NOT EXISTS `Inventory`
(
`idInventory` INT NOT NULL,
`idIngredient` INT NOT NULL,
`idStore` INT NOT NULL,
`expiryDate` DATE NULL,
`deliveryDate` DATE NOT NULL,
`amount` INT NOT NULL,
`isAccessible` INT NOT NULL,
CONSTRAINT `fk_Inventory_Ingredient`
FOREIGN KEY (`idIngredient`)
REFERENCES `Ingredient` (`idIngredient`),
CONSTRAINT `fk_Inventory_StoreA`
FOREIGN KEY (`idStore`)
REFERENCES `WaffleStore` (`idStore`),
CONSTRAINT pk_Inventory
PRIMARY KEY (idInventory)
);
CREATE TABLE IF NOT EXISTS `Inventory`
(
`idInventory` INT NOT NULL,
`idIngredient` INT NOT NULL,
`idStore` INT NOT NULL,
`expiryDate` DATE NULL,
`deliveryDate` DATE NOT NULL,
`amount` INT NOT NULL,
`isAccessible` INT NOT NULL,
PRIMARY KEY (`idIngredient`, `idStore`),
CONSTRAINT `fk_Inventory_Ingredient`
FOREIGN KEY (`idIngredient`)
REFERENCES `Ingredient` (`idIngredient`),
CONSTRAINT `fk_Inventory_StoreA`
FOREIGN KEY (`idStore`)
REFERENCES `WaffleStore` (`idStore`)
);
CREATE TABLE IF NOT EXISTS `Product`
(
`idProduct` INT NOT NULL PRIMARY KEY AUTO_INCREMENT,
`idNuIn` INT NOT NULL,
`price` FLOAT NOT NULL,
`name` VARCHAR(255) NOT NULL,
CONSTRAINT `fk_Product_NutritionalInformation1`
FOREIGN KEY (`idNuIn`)
REFERENCES `NutritionalInformation` (`idNuIn`)
);
CREATE TABLE IF NOT EXISTS `Waffle`
(
`idWaffle` INT NOT NULL PRIMARY KEY AUTO_INCREMENT,
`creatorName` VARCHAR(255) NULL,
`creationDate` DATE NOT NULL,
`processingTimeSec` INT,
`healty` VARCHAR(255),
CONSTRAINT `fk_Waffle_Product1`
FOREIGN KEY (`idWaffle`)
REFERENCES `Product` (`idProduct`)
);
CREATE TABLE IF NOT EXISTS `WaffleIngredient`
(
`idIngredient` INT NOT NULL,
`idWaffle` INT NOT NULL,
`amount` INT NOT NULL,
PRIMARY KEY (`idIngredient`, `idWaffle`),
CONSTRAINT `fk_WaffleRecept_Ingredient1`
FOREIGN KEY (`idIngredient`)
REFERENCES `Ingredient` (`idIngredient`),
CONSTRAINT `fk_WaffleRecept_Waffle1`
FOREIGN KEY (`idWaffle`)
REFERENCES `Waffle` (`idWaffle`)
);
CREATE TABLE IF NOT EXISTS `WaffleStore`
(
`idStore` INT NOT NULL PRIMARY KEY AUTO_INCREMENT,
`name` VARCHAR(255) NULL,
`areaCode` VARCHAR(15) NULL,
`location` VARCHAR(255) NULL,
`streetName` VARCHAR(255) NULL,
`houseNumber` VARCHAR(45) NULL
);
Example Inserts
INSERT INTO NutritionalInformation (idNuIn, calories, saturatedFat, transFat, carbohydrates, sugar, protein, salt)
VALUES (4, 60, 0, 0, 0, 0, 0, 0);
INSERT INTO NutritionalInformation (idNuIn, calories, saturatedFat, transFat, carbohydrates, sugar, protein, salt)
VALUES (5, 350, 3, 3, 5, 5, 3, 1);
INSERT INTO INGREDIENT (idIngredient, idNuIn, name, unit, price, processingTimeSec)
VALUES (3, 4, 'Apfel', 'g', 0.5, 3);
INSERT INTO PRODUCT (idProduct, idNuIn, price, name)
VALUES (4, 5, 3.5, 'ApfelWaffel');
INSERT INTO WAFFLE (idWaffle, creatorName, creationDate, processingTimeSec, healty)
VALUES (4, 'Berndt', '2020-12-01', NULL, NULL);
INSERT INTO WAFFLEINGREDIENT(idIngredient, idWaffle, amount)
VALUES (3, 4, 2);
INSERT INTO WaffleStore (idStore, name, areaCode, location, streetName, houseNumber)
VALUES (1, 'Waffle GMBH', '50000', 'TEST', 'TEST', '38');
INSERT INTO INVENTORY(idInventory, idIngredient, idStore, expiryDate, deliveryDate, amount, isAccessible)
VALUES (2, 3, 1, '3032-12-30', '3032-12-30', 100, 1);
INSERT INTO WaffleOrder(idOrder, idStore, totalAmount, paymentStatus, orderDate)
VALUES (1, 1, 2, 0, '2020-12-30');
Oracle SQL PROCEDURE
CREATE OR REPLACE PROCEDURE OnInventoryAdd (
s_idProduct IN INT,
s_idOrder IN INT,
s_extenal_amount IN INT
)
IS
v_store INT;
v_waffle_id INT;
v_cursor_ingredientid INT;
v_cursor_amount INT;
v_cursor_expiryDate DATE;
v_cursor_deliveryDate DATE;
v_operator VARCHAR(3) := 'add';
CURSOR v_Ingredient_Cursor_On_Insert(w_Id INT) IS
SELECT idIngredient, amount FROM WAFFLEINGREDIENT WHERE idWaffle = w_Id;
CURSOR v_Ingredient_Cursor_On_Delete(i_id INT) IS
SELECT expiryDate, deliveryDate FROM Inventory WHERE idIngredient = i_id;
BEGIN
SELECT idStore INTO v_store FROM WAFFLEORDER WHERE idOrder = s_idOrder;
SELECT w.idWaffle INTO v_waffle_id FROM Waffle w WHERE w.idProduct = s_idProduct;
-- If more than one waffle is bought
FOR x IN 1..s_extenal_amount LOOP
-- Get all ingredient information of waffle
OPEN v_Ingredient_Cursor_On_Insert(v_waffle_id);
LOOP
FETCH v_Ingredient_Cursor_On_Insert INTO v_cursor_ingredientId, v_cursor_amount;
EXIT WHEN v_Ingredient_Cursor_On_Insert%NOTFOUND;
-- Get all old expirydate and deliverydate information
OPEN v_Ingredient_Cursor_On_Delete(v_cursor_ingredientId);
LOOP
FETCH v_Ingredient_Cursor_On_Delete INTO v_cursor_expiryDate, v_cursor_deliveryDate;
EXIT WHEN v_Ingredient_Cursor_On_Delete%NOTFOUND;
END LOOP;
CLOSE v_Ingredient_Cursor_On_Delete;
END LOOP;
CLOSE v_Ingredient_Cursor_On_Insert;
-- Update the Inventory
InventoryUpdate(v_store, v_cursor_ingredientId, v_cursor_amount, v_operator, v_cursor_expiryDate, v_cursor_deliveryDate);
END LOOP;
END;
/
Current Version
DROP PROCEDURE IF EXISTS `OnInventoryAdd`;
DELIMITER //
CREATE PROCEDURE `OnInventoryAdd` (
s_idProduct INT,
s_idOrder INT,
s_extenal_amount INT
)
BEGIN
DECLARE loop_counter INT DEFAULT s_extenal_amount;
DECLARE v_store INT;
DECLARE v_waffle_id INT;
DECLARE v_cursor_ingredientid INT;
DECLARE v_cursor_amount INT;
DECLARE v_cursor_expiryDate DATE;
DECLARE v_cursor_deliveryDate DATE;
DECLARE v_operator VARCHAR(3) DEFAULT 'add';
DECLARE v_c_insert_done, v_c_delete_done BOOLEAN DEFAULT FALSE;
DECLARE v_Ingredient_Cursor_On_Insert CURSOR FOR
SELECT idIngredient, amount FROM WAFFLEINGREDIENT WHERE idWaffle = v_waffle_id;
DECLARE CONTINUE HANDLER FOR NOT FOUND SET v_c_insert_done = TRUE;
SELECT idStore INTO v_store FROM WAFFLEORDER WHERE idOrder = s_idOrder;
SELECT idWaffle INTO v_waffle_id FROM Waffle WHERE idWaffle = s_idProduct;
WHILE loop_counter > 0 DO
SET loop_counter = loop_counter - 1;
OPEN v_Ingredient_Cursor_On_Insert;
curr_insert_loop: LOOP
FETCH FROM v_Ingredient_Cursor_On_Insert INTO v_cursor_ingredientId, v_cursor_amount;
IF v_c_insert_done THEN
CLOSE v_Ingredient_Cursor_On_Insert;
LEAVE curr_insert_loop;
END IF;
BLOCK2 : BEGIN
DECLARE v_Ingredient_Cursor_On_Delete CURSOR FOR
SELECT expiryDate, deliveryDate FROM Inventory WHERE idIngredient = v_cursor_ingredientid;
DECLARE CONTINUE HANDLER FOR NOT FOUND SET v_c_delete_done = TRUE;
OPEN v_Ingredient_Cursor_On_Delete;
curr_delete_loop : LOOP
FETCH FROM v_Ingredient_Cursor_On_Delete INTO v_cursor_expiryDate, v_cursor_deliveryDate;
IF v_c_delete_done THEN
CLOSE v_Ingredient_Cursor_On_Delete;
LEAVE curr_delete_loop;
END IF;
END LOOP curr_delete_loop;
END BLOCK2;
END LOOP curr_insert_loop;
CALL InventoryUpdate(v_store, v_cursor_ingredientId, v_cursor_amount, v_operator, v_cursor_expiryDate, v_cursor_deliveryDate);
END WHILE;
END //
DELIMITER ;
Error
4 row(s) affected, 2 warning(s): 1264 Out of range value for column 'expiryDateOnInsert' at row 2 1264 Out of range value for column 'deliveryDateOnInsert' at row 1
Even tho I wrote the Oracle Procedure, I have zero clue how to write the same behavior in MYSQL and more over how to fix this error. If there is a alternative to do the same without cursors, then it would be fine too
Ok, I've managed to convert the oracle procedure into mysql stored procedure, here is the working code:
Code
CREATE PROCEDURE `OnInventoryAdd` (
s_idProduct INT,
s_idOrder INT,
s_extenal_amount INT
)
BEGIN
DECLARE loop_counter INT DEFAULT s_extenal_amount;
DECLARE done1, done2 BOOLEAN DEFAULT FALSE;
DECLARE v_store INT;
DECLARE v_waffle_id INT;
DECLARE v_operator VARCHAR(3) DEFAULT 'add';
DECLARE v_cursor_ingredientid INT;
DECLARE v_cursor_amount INT;
DECLARE v_cursor_expiryDate DATE;
DECLARE v_cursor_deliveryDate DATE;
DECLARE v_Ingredient_Cursor_On_Insert CURSOR FOR
SELECT idIngredient, amount FROM WAFFLEINGREDIENT WHERE idWaffle = v_waffle_id;
DECLARE CONTINUE HANDLER FOR NOT FOUND SET done1 = TRUE;
SELECT idStore INTO v_store FROM WAFFLEORDER WHERE idOrder = s_idOrder;
SELECT idWaffle INTO v_waffle_id FROM Waffle WHERE idWaffle = s_idProduct;
REPEAT
OPEN v_Ingredient_Cursor_On_Insert;
loop1 : LOOP
FETCH FROM v_Ingredient_Cursor_On_Insert INTO v_cursor_ingredientId, v_cursor_amount;
IF done1 THEN
CLOSE v_Ingredient_Cursor_On_Insert;
LEAVE loop1;
END IF;
BLOCK1 : BEGIN
DECLARE v_Ingredient_Cursor_On_Delete CURSOR FOR
SELECT expiryDate, deliveryDate FROM Inventory WHERE idIngredient = v_cursor_ingredientid;
DECLARE CONTINUE HANDLER FOR NOT FOUND SET done2 = TRUE;
OPEN v_Ingredient_Cursor_On_Delete;
loop2 : LOOP
FETCH FROM v_Ingredient_Cursor_On_Delete INTO v_cursor_expiryDate, v_cursor_deliveryDate;
IF done2 THEN
SET done2 = FALSE; -- This was the solution
LEAVE loop2;
END IF;
END LOOP loop2;
END BLOCK1;
END LOOP loop1;
CALL InventoryUpdate(v_store, v_cursor_ingredientId, v_cursor_amount, v_operator, v_cursor_expiryDate, v_cursor_deliveryDate);
SET loop_counter = loop_counter - 1;
UNTIL loop_counter = 0
END REPEAT;
END //
DELIMITER ;
I have a stored procedure to update some rows in MySQL. But when I call the stored procedure, it affects more than actual rows.
Here is my stored procedure:
CREATE DEFINER=`root`#`localhost` PROCEDURE `SP_INSERT_DATA`(
IN `incoming_data` TEXT,
IN `value_array` TEXT,
IN `serial_number` VARCHAR(50),
IN `data_timestamp` VARCHAR(50),
OUT `result_id` INT,
OUT `result_message` VARCHAR(500)
)
LANGUAGE SQL
NOT DETERMINISTIC
CONTAINS SQL
SQL SECURITY DEFINER
COMMENT ''
BEGIN
DECLARE i INT;
DECLARE value_iteration VARCHAR(50);
DECLARE lcl_data_type_id INT;
DECLARE arr_data_type_name VARCHAR(50);
DECLARE affected_data_row_count INT;
DECLARE cstmr_id INT;
DECLARE exit handler FOR 40001
BEGIN
GET DIAGNOSTICS CONDITION 1
#p1 = MYSQL_ERRNO, #p2 = MESSAGE_TEXT;
SET result_id = -2;
SET result_message = CONCAT('RETURNED ERROR NO : ', #p1 , '\r\nMESSAGE TEXT : ',#p2);
ROLLBACK;
END;
DECLARE exit handler for sqlexception
BEGIN
GET DIAGNOSTICS CONDITION 1
#p1 = MYSQL_ERRNO, #p2 = MESSAGE_TEXT;
SET result_id = -999;
SET result_message = CONCAT('RETURNED ERROR NO : ', #p1 , '\r\nMESSAGE TEXT : ',#p2);
ROLLBACK;
END;
START TRANSACTION;
SET i = 1;
SET affected_data_row_count = 0;
SET cstmr_id = 0;
SET result_id = 0;
SET result_message = 'Success';
SELECT id INTO cstmr_id FROM templaricustomers WHERE templaricustomers.customer_serial_number = serial_number LIMIT 1;
IF(cstmr_id <> 0) THEN
WHILE (LOCATE(',', value_array) > 0)
DO
SET arr_data_type_name = SUBSTRING_INDEX(value_array,',',i);
SET value_array = SUBSTRING(value_array, LOCATE(',',value_array) + 1);
SELECT JSON_EXTRACT(incoming_data, arr_data_type_name) INTO value_iteration;
SET arr_data_type_name := SUBSTRING_INDEX(arr_data_type_name, ".", -1);
IF (SELECT COUNT(id) FROM datatypes WHERE datatypes.data_name = arr_data_type_name) > 0 THEN
SELECT id INTO lcl_data_type_id FROM datatypes WHERE datatypes.data_name = arr_data_type_name LIMIT 1;
ELSE
INSERT INTO datatypes (datatypes.data_name,datatypes.description ,datatypes.inserted_date) VALUES(arr_data_type_name,arr_data_type_name,NOW());
SELECT id INTO lcl_data_type_id FROM datatypes WHERE datatypes.data_name = arr_data_type_name LIMIT 1;
END IF;
IF (SELECT COUNT(id) FROM mqttpacket WHERE mqttpacket.data_type_id = lcl_data_type_id AND mqttpacket.customer_id = cstmr_id) > 0 THEN
UPDATE mqttpacket SET mqttpacket.data_value = value_iteration , mqttpacket.inserted_time = data_timestamp WHERE mqttpacket.data_type_id = lcl_data_type_id AND mqttpacket.customer_id = cstmr_id;
ELSE
INSERT INTO mqttpacket (mqttpacket.data_type_id,mqttpacket.customer_id,mqttpacket.data_value,mqttpacket.inserted_time) VALUES(lcl_data_type_id,cstmr_id,value_iteration,data_timestamp);
END IF;
SET affected_data_row_count = affected_data_row_count +1;
END WHILE;
SET result_id = 0;
SET result_message = CONCAT('Query performed successfully. Effected rows : ',CAST(affected_data_row_count AS CHAR));
ELSE
SET result_id = -1;
SET result_message = 'Customer Serial Number not found.';
END IF;
COMMIT;
END
Here is how I call it:
CALL `SP_INSERT_DATA`('{"subcooling":-40,"B1":113,"B2":206,"B3":471,"B4":226,"B5":8,"B6":380,"B7":210,"B8":187,"Discharge":135,"Suction":120,"High_Pressure":90,"Low_Pressure":90,"Evaporation":73,"Condensation":73,"MAX_CMP_SPEED":1100,"Thermal_Limit":748,"SH":46,"EEV_pct":0,"COP":0,"DSH":60,"WaterFlux":8,"FanPower":1,"DeltaTtoStart":0,"DeltaPtoStart":60,"CMP_ROTOR_RPS":0,"SET_CH_FLASH":120,"SET_HP_FLASH":350,"SET_DHW_FLASH":470,"Defrosting":0,"B8_AVERAGE":63,"SET_PLANT":0,"SET_CH_BMS":160,"SET_HP_BMS":200,"SET_DHW_BMS":480,"SET_ACTIVE":200,"SET_DSH":250,"EEV_INJ_pct":0,"LPT":0,"HPT":0,"PLANT_MODE_MANUAL":0,"DHW_MODE_MANUAL":0,"WATER_FLOW":8,"DISCHARGE_TMP":135,"INVERTER_TMP":8,"ENVELOP_ZONE":1,"EEV_A_STEPS":0,"EBM_POWER":1,"EBM_MAX_POWER":106,"COMP_pct_FINAL":0,"TOTAL_POWER_ABSORBED":10,"POWER_OUT_KW":0,"COOLINGCAPACITY":0}' , '$.subcooling,$.B1,$.B2,$.B3,$.B4,$.B5,$.B6,$.B7,$.B8,$.Discharge,$.Suction,$.High_Pressure,$.Low_Pressure,$.Evaporation,$.Condensation,$.MAX_CMP_SPEED,$.Thermal_Limit,$.SH,$.EEV_pct,$.COP,$.DSH,$.WaterFlux,$.FanPower,$.DeltaTtoStart,$.DeltaPtoStart,$.CMP_ROTOR_RPS,$.SET_CH_FLASH,$.SET_HP_FLASH,$.SET_DHW_FLASH,$.Defrosting,$.B8_AVERAGE,$.SET_PLANT,$.SET_CH_BMS,$.SET_HP_BMS,$.SET_DHW_BMS,$.SET_ACTIVE,$.SET_DSH,$.EEV_INJ_pct,$.LPT,$.HPT,$.PLANT_MODE_MANUAL,$.DHW_MODE_MANUAL,$.WATER_FLOW,$.DISCHARGE_TMP,$.INVERTER_TMP,$.ENVELOP_ZONE,$.EEV_A_STEPS,$.EBM_POWER,$.EBM_MAX_POWER,$.COMP_pct_FINAL,$.TOTAL_POWER_ABSORBED,$.POWER_OUT_KW,$.COOLINGCAPACITY,', '123456', '2021-02-24 10:43:00.00' ,#result_id, #result_message);
The table mqttpacket is a system versioned table. Here are the table creation queries.
CREATE TABLE test_database.MQTTPacket(
id INT PRIMARY KEY NOT NULL AUTO_INCREMENT,
data_type_id INT NOT NULL,
customer_id INT NOT NULL,
data_value INT NULL,
row_start TIMESTAMP(6) GENERATED ALWAYS AS ROW START INVISIBLE,
row_end TIMESTAMP(6) GENERATED ALWAYS AS ROW END INVISIBLE,
inserted_time TIMESTAMP(6) NULL DEFAULT NULL,
PERIOD FOR SYSTEM_TIME(row_start,row_end),
FOREIGN KEY (data_type_id) REFERENCES test_database.DataTypes(id),
FOREIGN KEY (customer_id) REFERENCES test_database.templaricustomers(id)
)WITH SYSTEM VERSIONING;
CREATE TABLE `datatypes` (
`id` INT(11) NOT NULL AUTO_INCREMENT,
`data_name` VARCHAR(50) NOT NULL COLLATE 'latin1_general_ci',
`inserted_date` DATE NULL DEFAULT NULL,
`description` VARCHAR(50) NULL DEFAULT NULL COLLATE 'latin1_general_ci',
`device_id` INT(11) NULL DEFAULT NULL,
PRIMARY KEY (`id`) USING BTREE,
INDEX `device_id` (`device_id`) USING BTREE,
CONSTRAINT `datatypes_ibfk_1` FOREIGN KEY (`device_id`) REFERENCES `test_database`.`devices` (`id`) ON UPDATE RESTRICT ON DELETE RESTRICT
)
CREATE TABLE `templaricustomers` (
`id` INT(11) NOT NULL AUTO_INCREMENT,
`customer_serial_number` VARCHAR(50) NOT NULL COLLATE 'latin1_general_ci',
`customer_name` VARCHAR(50) NULL DEFAULT NULL COLLATE 'latin1_general_ci',
`inserted_date` TIMESTAMP(6) NOT NULL DEFAULT current_timestamp(6),
PRIMARY KEY (`id`) USING BTREE
)
So, when I first call the stored procedure, my result_message variable returns "Query performed successfully. Effected rows : 53" however MySql says
Affected rows: 107 Found rows: 0 Warnings: 0 Duration for 1 query: 0.015 sec.
In the second call of the SP, it says
Affected rows: 160 Found rows: 0 Warnings: 0 Duration for 1 query: 0.031 sec.
Thankful for any help in advance.
I'm having difficulty with developing the logic in MySQL. I don't know how to INSERT multiple records from a Table AFTER UPDATE.
CREATE TABLE primeira(
ID int PRIMARY KEY AUTO_INCREMENT,
nome varchar(30) NOT NULL,
valor int DEFAULT 0
);
CREATE TABLE segunda(
ID int PRIMARY KEY AUTO_INCREMENT,
ID_primeira int,
ultimo_valor int DEFAULT 0,
credito int NOT NULL,
limite int DEFAULT 0,
FOREIGN KEY(ID_primeira) references primeira(ID)
);
CREATE TABLE terceira(
ID int PRIMARY KEY AUTO_INCREMENT,
ID_segunda int,
`data` TIMESTAMP DEFAULT CURRENT_TIMESTAMP NOT NULL,
estado boolean DEFAULT false,
FOREIGN KEY(ID_segunda) references segunda(ID)
);
CREATE TRIGGER tr_segundaLimite_INS
BEFORE INSERT ON segunda FOR EACH ROW
SET NEW.limite = New.ultimo_valor + New.credito;
DELIMITER //
CREATE TRIGGER tr_primeira_UPD
AFTER UPDATE ON primeira FOR EACH ROW
IF (SELECT limite FROM segunda WHERE segunda.ID_primeira = New.ID AND
(limite - NEW.valor)< 50) THEN
INSERT INTO terceira(ID_segunda)
VALUES ((SELECT ID FROM segunda WHERE segunda.ID_primeira = New.ID
AND (limite - NEW.valor)< 50));
END IF;
END
//
DELIMITER ;
I'm going to use procedures with functions to SELECT the data. The problem with this TRIGGER is that it's not working when there are multiple matching records.
The error that I am getting is-
subquery returns more than 1 row.
The objective is: After an update of the primeira.valor, the trigger would subtract segunda.limite - New.valor. If this difference is < 50 then all the matching segunda.ID would be registered at terceira.ID_segunda on terceira table.
I'm using data below:
INSERT INTO primeira(nome,valor)
VALUES
('Burro',800),
('Chiconizio',300),
('Xerosque',400),
('Shrek',600);
INSERT INTO segunda(ID_primeira,ultimo_valor,credito)
VALUES
(1,600,800),
(1,700,400),
(1,800,500),
(2,150,200),
(2,200,180),
(2,250,300);
UPDATE primeira
SET Valor = 330
WHERE ID = 2;
You need CURSOR for this. You can try the following trigger code. I hope this will fix your issue.
DELIMITER //
CREATE TRIGGER tr_primeira_UPD
AFTER UPDATE ON primeira FOR EACH ROW
BEGIN
DECLARE v_limite_diff INT;
DECLARE v_seg_id INT;
DECLARE done INT DEFAULT FALSE;
DECLARE c1 CURSOR FOR SELECT (s.limite - NEW.valor), s.id
FROM segunda s WHERE s.ID_primeira = New.ID;
DECLARE CONTINUE HANDLER FOR NOT FOUND SET done = TRUE;
OPEN c1;
my_loop: LOOP
FETCH c1 INTO v_limite_diff, v_seg_id;
IF done THEN
LEAVE my_loop;
END IF;
IF( v_limite_diff < 50 ) THEN
INSERT INTO terceira(ID_segunda) VALUES(v_seg_id);
END IF;
END LOOP;
END//
DELIMITER ;
I'm trying to write a mySQL procedure with a cursor to calculate a fare. I pass in the stationid's then I figure out what zone they are in. The fare is a set value of $1 and an additional $0.20 for each zone traveled in.
The code I have so far runs but there is a problem with the cursor not fetching the values into the variables.
Any help would be greatly appreciated. Thanks
Tables:
DROP DATABASE IF EXISTS luasSystem;
CREATE DATABASE luasSystem;
USE luasSystem;
CREATE TABLE IF NOT EXISTS line
(
line_id INT NOT NULL AUTO_INCREMENT,
Line_colour CHAR(10) NOT NULL,
PRIMARY KEY (line_id)
) ENGINE=InnoDB;
CREATE TABLE IF NOT EXISTS zone
(
zone_id INT NOT NULL AUTO_INCREMENT,
zone_name VARCHAR(20) NOT NULL,
line INT NOT NULL,
PRIMARY KEY (zone_id),
FOREIGN KEY (line) REFERENCES line(line_id) ON UPDATE CASCADE ON DELETE RESTRICT
) ENGINE=InnoDB;
CREATE TABLE IF NOT EXISTS station
(
station_id INT NOT NULL AUTO_INCREMENT,
station_name CHAR(20) NOT NULL,
service CHAR(20),
line INT NOT NULL,
zone INT NOT NULL,
PRIMARY KEY (station_id),
FOREIGN KEY (line) REFERENCES line(line_id) ON UPDATE CASCADE ON DELETE RESTRICT,
FOREIGN KEY (zone) REFERENCES zone(zone_id) ON UPDATE CASCADE ON DELETE RESTRICT
) ENGINE=InnoDB;
Stored Procedure:
DROP PROCEDURE IF EXISTS calculateFare;
DELIMITER //
CREATE PROCEDURE calculateFare
(
IN stationid1 INT, IN stationid2 INT
)
BEGIN
DECLARE zoneNum1 INT;
DECLARE zoneNum2 INT;
DECLARE num INT;
DECLARE fare DOUBLE;
DECLARE tableEnd BOOLEAN;
DECLARE zoneCur CURSOR FOR
SELECT zone, zone FROM station
WHERE station_name = stationid1 AND station_name = stationid2;
DECLARE CONTINUE HANDLER FOR NOT FOUND
SET tableEnd = TRUE;
OPEN zoneCur;
the_loop: LOOP
FETCH zoneCur
INTO zoneNum1, zoneNum2;
IF tableEnd THEN
CLOSE zoneCur;
LEAVE the_loop;
END IF;
SET fare = 1;
SET num = 0;
IF zoneNum1 < zoneNum2 THEN
SET num = zoneNum2 - zoneNum1;
ELSEIF zoneNum1 > zoneNum2 THEN
SET num = zoneNum1 - zoneNum2;
END IF;
SET fare = (num * 0.20) + 1;
SELECT fare;
END LOOP the_loop;
END //
DELIMITER ;
CAll calculateFare(3,5);
Wouldn't this be easier of you used decimal values instead of integers? Suggest you look at : http://dev.mysql.com/doc/refman/5.0/en/fixed-point-types.html
Within a BPM web application, I have a field for an invoice # on a particular page but I need for it to be auto generated every time a user attaches an invoice and views that page. That number must be unique and preferably auto-incremented. A value for the invoice # field can be displayed by querying from a table from an external MYSQL database. So every time a user lands on that particular page, a SELECT query statement can be fired.
On MYSQL end, how would I set this up? So basically, I would like to setup a query for that invoice # field where it will for run a query for example,
SELECT invoice_num FROM invoice_generator
and every time this query runs, it would return the next incremented number.
You can use mysql trigger concept here....
I have added one example here...
It will be very usefull for u (see this link also :http://www.freemindsystems.com/mysql-triggers-a-practical-example/)
CREATE TABLE `products` (
`id` int(11) NOT NULL AUTO_INCREMENT,
`name` varchar(50) NOT NULL DEFAULT '',
`price` int(20) NOT NULL DEFAULT '0',
`other` varchar(50) DEFAULT NULL,
PRIMARY KEY (`id`),
KEY `products_name_idx` (`name`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;
CREATE TABLE `freetags` (
`id` int(11) NOT NULL AUTO_INCREMENT,
`tag` varchar(50) NOT NULL DEFAULT '',
PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;
CREATE TABLE `freetagged_objects` (
`tag_id` int(20) NOT NULL DEFAULT '0',
`object_id` int(20) NOT NULL DEFAULT '0',
`tagged_on` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
`module` varchar(50) NOT NULL DEFAULT '',
PRIMARY KEY (`tag_id`, `object_id`),
KEY `freetagged_objects_tag_id_object_id_idx` (`tag_id`, `object_id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8
INSERT_PRODUCTS_TAGS
DELIMITER ||
DROP TRIGGER IF EXISTS insert_products_tags;
||
DELIMITER ##
CREATE TRIGGER insert_products_tags AFTER INSERT ON products
FOR EACH ROW
BEGIN
DECLARE current_id integer;
DECLARE tag_id integer;
DECLARE next integer;
DECLARE tag_field varchar(255);
DECLARE next_sep integer;
DECLARE current_tag varchar(255);
DECLARE right_tag varchar(255);
-- We use the field other as comma-separated tag_field
SET tag_field = NEW.other;
-- Check for empty tags
IF (CHAR_LENGTH(tag_field) <> 0) THEN
-- Loop until no more ocurrencies
set next = 1;
WHILE next = 1 DO
-- Find possition of the next ","
SELECT INSTR(tag_field, ',') INTO next_sep;
IF (next_sep > 0) THEN
SELECT SUBSTR(tag_field, 1, next_sep - 1) INTO current_tag;
SELECT SUBSTR(tag_field, next_sep + 1, CHAR_LENGTH(tag_field)) INTO right_tag;
set tag_field = right_tag;
ELSE
set next = 0;
set current_tag = tag_field;
END IF;
-- Drop spaces between comas
SELECT TRIM(current_tag) INTO current_tag;
-- Insert the tag if not already present
IF (NOT EXISTS (SELECT tag FROM freetags WHERE tag = current_tag)) THEN
-- Insert the tag
INSERT INTO freetags (tag) values (current_tag);
SELECT LAST_INSERT_ID() INTO tag_id;
ELSE
-- Or get the id
SELECT id FROM freetags WHERE tag = current_tag INTO tag_id;
END IF;
-- Link the object tagged with the tag
INSERT INTO freetagged_objects
(tag_id, object_id, module)
values
(tag_id, NEW.id, 'products');
END WHILE;
END IF;
END;
##
Now If you execute an insert on products table:
INSERT INTO PRODUCTS
(name, price, other)
values
("product1", 2, "tag1, tag2,tag3 , tag 4");