CODEWITHSUNDEEP
javahibernatejakarta-eehql
Mahadi Siregar
Mahadi Siregar

Reputation: 625

Group By and Sum result in HQL

CREATE TABLE project(
    Id int auto_increment primary key,
    Name char(50) NOT NULL
)ENGINE = InnoDB;

CREATE TABLE car(
    Id int auto_increment primary key,
    ProjectId int(11) NOT NULL,
    Plate char(10) NOT NULL,
    Latitude varchar(50) DEFAULT '-6.221165',
    Longitude varchar(50) DEFAULT '106.833286',
    LastTemp varchar(20) DEFAULT '0',
    LastSpeed varchar(20) DEFAULT '0',
    LastGap double DEFAULT 0,
    Mileage double DEFAULT 0,
    CONSTRAINT fk_car_project FOREIGN KEY(ProjectId)REFERENCES project(Id) ON UPDATE CASCADE
)ENGINE = InnoDB;

CREATE TABLE car_log(
    Id int auto_increment primary key,
    CarId int NOT NULL,
    Latitude varchar(50),
    Longitude varchar(50),
    Temp varchar(20),
    Speed varchar(20),
    Gap double DEFAULT 0,
    LogDate TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
    CONSTRAINT fk_carlog_car FOREIGN KEY(CarId)REFERENCES car(Id) ON UPDATE CASCADE
 )

Table car used to save car data and has a foreign key from table project. Table car_log used to save every movement in car (log). I have create object foreach this table. In this case, I want to display each car summary (sum of Gap per day) in a project. This is my query when i want to select summary of each car in project 1

select CarId, DATE(LogDate) dateOnly, sum(Gap)/1000 KM from car_log where CarId IN (SELECT Id FROM car where ProjectId = 1) group by CarId, dateOnly;

But i confuse how to handle this in HQL. I try to create new object to handle this, but confuse to use it. And I want to ask how to solve this,

public class CarLogDate {
    private double km;
    private Date date;
    //constructor & setter getter
}

Upvotes: 0

Views: 11193

Answers (2)

PSR
PSR

Reputation: 40328

In your query just replace table name with entity name and table column names with entity properties.

List<Object[]> list = 
    select CarId, LogDate dateOnly, sum(Gap)/1000 KM
    from CarLogDate
    where CarId IN
        (SELECT Id FROM car where ProjectId = 1)
    group by CarId, dateOnly;

Upvotes: 2

Mahadi Siregar
Mahadi Siregar

Reputation: 625

List<Object[]> q = sessionFactory.getCurrentSession().createQuery("SELECT O.car.id AS carId, DATE(O.logDate) AS dateOnly, sum(O.gap)/1000 AS Km from CarLog O " +
            "WHERE carId IN (SELECT id FROM Car c where c.project.id = 1) GROUP BY carId, DATE(O.logDate)").list();
for(Object[] a : q)
    System.out.println(a[0]+" "+a[1]+" "+a[2]);

Or maybe you can instantiate the object by using Object[] a as parameter.

Upvotes: 1

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