MySQL - Stored Procedure - mysql

Question

I need to fetch data from the stored procedure and present it in a dashboard. So the background for this is.
For every select query in the Stored procedure will return only one record I've around 10 queries like that. Apart from that I've also a query which will return say some 5 rows in the same stored procedure.
I want this 5 records to be presented as 1 line along with the other queries in the same stored procedure.
Example:
CALL dashboard_proc() Will return
Date Amount total_orders
1-1-2017 500.00 50
A part from above output I want to append another select query to the same stored procedure (dashboard_proc). The other query which will return
Place Total
Hyderabad 100
Bangalore 100
Chennai 200
Mumbai 100
And I need below
Date Amount total_orders Hyderabad Bangalore Chennai Mumbai
1-1-2016 500.00 50 100 100 200 100

Answer 1

Based on your inputs:
First Part of the report has only one record so I have used the below structure
CREATE TABLE `ResultPart1` (
`ReportDate` date NOT NULL,
`Amount` float DEFAULT NULL,
`total_orders` int(11) DEFAULT NULL
)
insert into ResultPart1 select '2017-01-01', 500.00 , 50;
2. Second Part of the report will have distinct Places, here the places used are single word and no keyword used.
CREATE TABLE `ResultPart2` (
`Place` varchar(50) NOT NULL,
`Total` int(11) DEFAULT NULL
)
insert into ResultPart2()
Select 'Hyderabad', 100 union
Select 'Bangalore' , 100 union
Select 'Chennai' , 200 union
Select 'Mumbai' , 100;
3. Create Stored Procedure
CREATE PROCEDURE `new_procedureDashboard`()
BEGIN
Declare vPlaceCount int;
Declare vquery varchar(1000);
declare vPlace varchar(1000);
declare vPlaceTotal int;
-- select * from ResultPart1;
-- Select * from ResultPart2;
CREATE TEMPORARY TABLE IF NOT EXISTS Table_ResultPart2
(
Id int NOT NULL AUTO_INCREMENT,
Place varchar(100),
PlaceTotal int ,
PRIMARY KEY (id)
);
insert into Table_ResultPart2(Place,PlaceTotal)
Select distinct Place,Total from ResultPart2;
SET vPlaceCount=(Select count(*)from Table_ResultPart2);
WHILE vPlaceCount>0 DO
SET vPlace=(Select Place from Table_ResultPart2 where Id=vPlaceCount);
SET vPlaceTotal=(Select PlaceTotal from Table_ResultPart2 where Id=vPlaceCount);
SET vquery=concat("", "alter table ResultPart1 add " ,vPlace ," int ;");
Select vquery into #AddColumn;
PREPARE stmt FROM #AddColumn;
-- Select #AddColumn;
EXECUTE stmt;
DEALLOCATE PREPARE stmt;
SET vquery="";
-- Select vPlace,vPlaceTotal;
-- Update
SET SQL_SAFE_UPDATES = 0;
SET vquery=concat("", "update ResultPart1 SET " ,vPlace ," = " ,vPlaceTotal ," where 1=1 ;");
Select vquery into #UpdateColumn;
-- select #UpdateColumn;
PREPARE stmt1 FROM #UpdateColumn;
-- Select #AddColumn;
EXECUTE stmt1;
DEALLOCATE PREPARE stmt1;
SET SQL_SAFE_UPDATES = 1;
SET vPlaceCount=vPlaceCount-1;
SET vPlace="" ;
END WHILE;
Select * from ResultPart1;
drop TEMPORARY TABLE IF EXISTS Table_ResultPart2;
END
Explanation:
Added the required column in the main resultant table using loop, and updated the values of the newly place(added) column using the loop. You will require to make changes in your stored procedure as I have used permanent tables (ResultPart1 and ResultPart2 ) .
4. Result
Alter Statements to drop column Just in case you want to rerun the stored procedure.
alter table ResultPart1 drop column Hyderabad;
alter table ResultPart1 drop column Bangalore;
alter table ResultPart1 drop column Chennai;
alter table ResultPart1 drop column Mumbai;