How to delete/update by querying on JPA interface? - mysql

Question

The Item table has Many to One relationship with supplier table.
If i delete supplier table row data by Id, its not deleting the row.
The Item table has many rows with same supplier Id. If i delete in supplier table with id, the item table supplier column data /id should be deleted.
Thanks in advance
Item
package com.ingroinfo.ubm.entity;
import java.util.Date;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.JoinColumn;
import javax.persistence.ManyToOne;
import javax.persistence.SequenceGenerator;
import javax.persistence.Table;
import org.hibernate.annotations.CreationTimestamp;
import org.hibernate.annotations.UpdateTimestamp;
import lombok.AllArgsConstructor;
import lombok.Getter;
import lombok.NoArgsConstructor;
import lombok.Setter;
#Entity
#Getter
#Setter
#NoArgsConstructor
#AllArgsConstructor
#Table(name = "master_item")
#SequenceGenerator(name = "item_sequence", initialValue = 201, allocationSize = 10000)
public class Item {
#Id
#GeneratedValue(strategy = GenerationType.SEQUENCE, generator = "branch_sequence")
private Long itemId;
private String itemName;
private String itemImage;
private String itemStatus;
private String unitOfMeasure;
private String remarks;
private String units;
#ManyToOne
#JoinColumn(name = "category_id")
private Category category;
#ManyToOne
#JoinColumn(name = "supplier_id")
private Supplier supplier;
#ManyToOne
#JoinColumn(name = "brand_id")
private Brand brand;
#ManyToOne
#JoinColumn(name = "publisher_id")
private BrandPublisher publisher;
#ManyToOne
#JoinColumn(name = "hsn_id")
private HsnCode hsnCode;
#Column(name = "date_created")
#CreationTimestamp
private Date dateCreated;
#Column(name = "last_updated")
#UpdateTimestamp
private Date lastUpdated;
}
ItemRepository
package com.ingroinfo.ubm.dao;
import javax.transaction.Transactional;
import org.springframework.data.jpa.repository.JpaRepository;
import org.springframework.data.jpa.repository.Modifying;
import org.springframework.data.jpa.repository.Query;
import org.springframework.data.repository.query.Param;
import org.springframework.stereotype.Repository;
import com.ingroinfo.ubm.entity.Item;
#Repository
#Transactional
public interface ItemRepository extends JpaRepository<Item, Long> {
Item findByItemId(Long id);
#Modifying
#Query("UPDATE Item i SET i.supplier= :val WHERE i.supplier = :id")
void deleteSupplierId(#Param("val") String val, #Param("id") Long id);
}
MasterService
void deleteItemSupplierId(String val, Long id);
MasterServiceImpl
#Override
public void deleteItemSupplierId(String val, Long id) {
itemRepository.deleteSupplierId(val, id);
}
MasterController
#GetMapping("/supplier/delete")
public String deleteSupplier(#RequestParam Long supplierId) {
masterService.deleteItemSupplierId(null, supplierId);
masterService.deleteBySupplierId(supplierId);
return "redirect:/master/supplier/list?supplierDeleted";
}

Answer 1

You can do that by using cascade types, for example
#OneToMany(cascade = CascadeType.REMOVE)