Unable to create unique key constraint not found

Question

I have the following entity:

@Entity
@Table(name = "campaign_content", uniqueConstraints = @UniqueConstraint(columnNames = { "campaignContentId", "campaignId", "fieldTag" }))    
public class CampaignContent implements Serializable {
    private static final long serialVersionUID = 1L;

    @Id
    @Column(name = "campaign_content_id")
    private Integer campaignContentId;

    @Column(name = "field_content")
    private String fieldContent;

    @Column(name = "campaign_id")
    private Integer campaignId;

    @Column(name = "field_tag")
    private String fieldTag;

Answer 1

The name of the column is campaign_content_id , not campaignContentId . Same thing for the other columns, of course. The columnNames attribute expects an array of ... column names. Not an array of Java field or property names.

Answer 2

In my case this code works, one physical table field name and one entity object member field name.

@Table(uniqueConstraints={@UniqueConstraint(columnNames = {"account_id" , "measureDate"})})

but this code doesn't work at all with same exception.

@Table(uniqueConstraints={@UniqueConstraint(columnNames = {"account_id" , "measure_date"})})

Someone reported this bug to hibernate. Check this. https://forum.hibernate.org/viewtopic.php?f=9&t=986581&view=next

I use

• spring boot
• spring data
• mysql

Answer 3

我的问题由此解决了您的表定义必须如下所示 @Table(name = "campaign_content", uniqueConstraints = @UniqueConstraint(columnNames = { "campaign_content_id", "campaign_id", "field_tag" }))

Answer 4

For anyone getting this error while using Kotlin, my issue was caused by using @Column instead of @get:Column on a var . Doh!

Answer 5

如果任何用@Column(name="...") 注释的约束列，您还需要将@Columnt(name = "...") 添加到另一个约束列