Question

I get an error com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: Unknown column 'productId3' in 'where clause' when trying to run this query:

public Vendor getVendorId(ProductInfo productInfo) { 
        return (Vendor) this.sessionFactory
                .getCurrentSession()
                .createQuery(
                        "select vendorId from Product where productId3 = :id")
                .setParameter("id", productInfo).uniqueResult();
    }

The class Product looks like this:

@Entity
@Table(name="PRODUCT")
public class Product{

    @Id
    @GeneratedValue
    @Column(name="PRODUCT_ID2")
    private Integer productId2;

    public void setProductId2(Integer productId2){
        this.productId2 = productId2;
    }

    public Integer getProductId2(){
        return productId2;
    }

    @ManyToOne(cascade=CascadeType.ALL)
    @JoinColumn(name="PRODUCT_ID3")
    private ProductInfo productId3;

    public void setProductId3(ProductInfo productId3){
        this.productId3 = productId3;
    }

    public ProductInfo getProductId3(){
        return productId3;
    }

    @ManyToOne(cascade=CascadeType.ALL)
    @JoinColumn(name="VENDOR_ID")
    private Vendor vendorId;

    public void setVendorId(Vendor vendorId){
        this.vendorId = vendorId;
    }

    public Vendor getVendorId(){
        return vendorId;
    }

    @OneToMany(mappedBy="productId2")
    private Set<ProductRevision> productRevisions;

    public void setProductRevisions(Set<ProductRevision> productRevisions){
        this.productRevisions = productRevisions;
    }

    public Set<ProductRevision> getProductRevisions(){
        return productRevisions;
    }
}

Why do I get this error? I don’t understand why it can’t find the column as the name is exactly the same. Thanks for your help!

/D

Answer 1

Use this query:

select p.vendorId from Product p where p.productId3 = :id