I am using spring-data-redis to communicate with database.
I have entity class like below
#RedisHash(value = "employee")
public class Employee
{
#Id
private long id;
#Indexed
private String name;
#Indexed
private int age;
private Address address;
...... ...... ......
}
I want to filter the employees based on age group. For example, age lesser than 35 (age<35). How to achieve this in below repository?
#Repository
public interface EmployeeRepo extends CrudRepository<Employee, Long>
{
public Employee findByName(String name);
}
I dont prefer to load complete data from table and do search using any loop/stream.
I don't think it does. I tried to implement what you tried to do using
#Index
long lastUpdatedOn;
when I checked the redis it gives a key entity:lastUpdatedOn:160.... and I tried searching for it using ZRANGE which gives no results.
Related
I want to be able to create a new account for my application. I have an account class which represents one entity and another class that represents personal information of the account. In order to create the new account and have it be in the database I want to add some information into the account table and some information into the PersonalInfo table as detailed in the classes below. How do I do this with a CrudRespository interface. As I understand it, the crudrepository can interact with one table in the database. In my example that would be Accounts. This is fine because most of my checking and communicating will be with the accounts table. But for when I am creating a new account I need to add the data that will be given into two tables. Do I have to make manual queries and add it as a method in there?
#Entity
#Component
public class Account {
#Id
private int accountNum;
private String accountType;
private int accountBalance;
private String accountStatus;
#Entity
#Component
public class PersonalInfo {
#Id
private int accountNum;
private String firstName;
private String lastName;
private String SSN;
private String streetName;
private String city;
private String state;
private String zipcode;
#RepositoryRestResource(collectionResourceRel="accounts",path="accounts")
public interface AccountsDB extends CrudRepository<Account, Integer>{
}
Just create a repository for PersonalInfo and invoke two save() methods (of the two different repositories respectively) with the two created entities respectively.
Just make sure to set the identical ids (accountNum) for these two entities.
Or, you could create a service to do it for you, like so:
public interface AccountAndPersonalInfoService {
void save(Account account, PersonalInfo personalInfo);
}
#Service
public class AccountAndPersonalInfoServiceImpl implements AccountAndPersonalInfoService {
#Autowired
private AccountsDB accountsDB;
#Autowired
private PersonalInfoDB personalInfoDB;
#Override
void save(Account account, PersonalInfo personalInfo) {
if (account.getAccountNum() == personalInfo.getAccountNum()) {
accountsDB.save(account);
personalInfoDB.save(personalInfo);
} else throw new IllegalArgumentException("The ids of the entities do not match.");
}
}
I am trying to query based on Object attributes combination in MongoDB:
My Object looks like:
#Getter
#Setter
class Person {
private String name;
private String email;
private Address address;
}
Address entity looks like:
#Getter
#Setter
class Address {
private String city;
private String state;
private String postal;
private String country;
}
Assume that above classes are also annotated with necessary attributes required for MongoDB collections.
Now when I am about to query from a PersonRepo interface that extends MongoRepository, as:
public interface PersonRepo extends MongoRepository<Person, String> {
}
The objective is to fetch all result-set where Address matches any combination of city, state, postal or country. For example, I want to fetch all results where city=XYZCity, state = ABCState, Postal might not be provided and country might be DEFCountry.
Address can be in any combination and whatever combination matches, the result-set could be produced.
I am currently learning spring boot , hibernate and Spring Boot JPA
I developing a Classroom App for coaching centers and institutes .
In it, students enrolled to multiple courses in a single institute
The Student Entity class :
#Entity
#Table(name = "student")
public class Student {
private String name;
private String dob;
private String gender;
private String address;
private String email;
private Integer mobile;
private String joined;
private Integer instID;
#Id
private String studentid;
getters and setters()....
}
Course Table Entity class
#Entity
#Table(name = "courses")
public class Course {
private String name;
private String description;
private String logo;
private String start;
private String end;
private Integer fee;
#Id
private String courseid;
private Integer instID;
getters and setters();
}
Enrolled Classes Table's Entity class
public class EnrolledCourses {
#Id
String enrollID;
String courseid;
String studentid;
Date joined;
getters and setters()...
}
JPA Repository
#Repository
public interface StudentRepository extends CrudRepository<Student, String> {
Student findTopByInstIDOrderByStudentidDesc(int instID);
}
#Repository
public interface CourseRepository extends CrudRepository<Course,String> {
}
#Repository
public interface EnrolledRepository extends CrudRepository<Course,String> {
}
My Need
Now I am retrieving enrolled students for a given course in a given institute... by using this MySQL query
SELECT
`enrolled_courses.enrollID`,
`student.name`, `student.studentid`
FROM `enrolled_courses`
INNER JOIN `student`
WHERE
`enrolled_courses.studentid` = `student.studentid`
AND
`student.instID` = 13
AND
`enrolled_courses.courseid` = '13I01C' ;
Now I need to implement this Inner join query in CourseRepository (or enrolledstudent repo)
How to achieve this ?
Please guide me
If we use hibernate mapping in EnrolledCourses entity like
#Entity
public class EnrolledCourses {
#Id
String enrolledId;
#ManyToOne
Student student;
#ManyToOne
Course course;
Date joined;
getters and setters()...
}
from the above mappings without using any SQL queries, you can retrieve all student who comes under a particular course
By using the method in the interface
#Repository
public interface EnrolledRepository extends CrudRepository<EnrolledCourses,String> {
List<EnrolledCourses> findByCourse_CourseId(String courseId);
}
if we have some relations between the entities we can easily retrieve all the fields using Jpa.
I have a Springboot Application with Repositories having Spring Data JPA Queries like findOne, findAll and also derived ones like findByID or findByName etc.
What I want to achieve is multitenancy. All entities have an "account_id" column which holds the tenant.
How do I add a filter like "account_id" to all the queries metioned above without using derived queries that contains those name slike findIdAndAccountid (which would be findone)
#Repository
public interface CategoryRepository extends JpaRepository<Category, Long> {
Category findByName(String name);
}
Here's the corresponding entity
#Entity
#Table(name = "unit")
#Data
public class Unit {
#Id
#GeneratedValue(strategy=GenerationType.AUTO)
private Long id;
private String name;
#Column(name = "account_id")
private Long account_id;
}
I know most people use schemas as tenant separation but that's impossible for me. Is there a way (I didn't find one) to add such a tenant filter condition on those queries without writing NamedQueries or using DerivedQueries. An elegeant solution like annotate the repository or entity or maybe the queries that all queries should add the additional filter "account_id"?
You can add Where clause on your Entity classes (Didnt had time to test )
#Entity
#Table(name = "unit")
#Data
#Where(clause = "account_id= :account_id")
public class Unit {
#Id
#GeneratedValue(strategy=GenerationType.AUTO)
private Long id;
private String name;
#Column(name = "account_id")
private Long account_id;
}
Update and Solution
1. Create a Filter & FilterDef on the entity like so
#FilterDef(name="accountFilter", parameters=#ParamDef( name="accountId", type="long" ) )
#Filters( {
#Filter(name="accountFilter", condition=":accountId = account_id")
} )
public class Category {
#Id
#GeneratedValue(strategy=GenerationType.AUTO)
private Long id;
private String name;
#Column(name = "account_id")
private Long account_id;
}
enable filtering in the controller by autowiring entitymanager, writing a method to enable the filter and activate the filter in #ModelAttribute for each request
#RestController
#RequestMapping(path = "/categories",produces = MediaType.APPLICATION_JSON_VALUE )
public class CategoryController {
private final CategoryRepository repository;
#Autowired
private EntityManager entityManager;
CategoryController(CategoryRepository repository) {
this.repository = repository;
}
private void activateFilter() {
Session session = entityManager.unwrap(Session.class);
Filter filter = session.enableFilter("accountFilter");
filter.setParameter("accountId", Long.valueOf(TenantContext.getCurrentTenant()));
}
#ModelAttribute
public void initFilter() {
activateFilter();
}
... your rest methods here
}
I started using spring data redis in my project for temporary storing some data. Redis is new for me, I've never worked something similar to redis before (Key-Value).
So, traditionally I created repository via extending CrudRepository and my #RedisHash is:
#Data
#NoArgsConstructor
#AllArgsConstructor
#RedisHash(value = "employee", timeToLive = 100)
public class RedisEmployee implements Serializable {
#Id
private String id;
#Indexed
private Long employeeId;
private String fullName;
#Indexed
private String date;
#Indexed
private String companyName;
private String phone;
}
So it works fine but I noticed something strange for me, it's result when
I watch GUI.
This is all data when I save with CrudRepository only one "entity"
So, Look how much rows, I just save 1 #RedisHash value, it could be because of #Indexed annotation but anyway it looks very strange for me.
P.S.
I noticed that without #Indexed it's impossible to find anything, for example:
#Repository
public interface RedisEmployeeRepository extends CrudRepository<RedisEmployee, String> {
RedisEmployee findByDateAndCompanyNameAndEmployeeId(String date, String companyName, Long employeeId);
}
so, findByDateAndCompanyNameAndEmployeeId will not return result if I don't have all fields #Indexed. Can't understand it is proper or not.