Question

所以我想添加一个使用两列的唯一约束。我在db中添加了唯一约束，我有以下Java代码

@Entity
@Table(
    name = "test_table",
    uniqueConstraints = @UniqueConstraint(
        columnNames = {
            "other_table_id",
            "sort_order"
        },
        name = "my_unique_constraint")
)
class SomeTable {

    private String label;

    @ManyToOne(optional = false)
    @JoinColumn(name = "other_table_id", nullable = false)
    private OtherTable otherTable;

    @NotNull
    @Column(name = "sort_order", nullable = false)
    private int sortOrder;
}

当我修改此表的排序并更新记录时，我得到了

Caused by: com.mysql.jdbc.exceptions.jdbc4.MySQLIntegrityConstraintViolationException:
 Duplicate entry '1-2' for key 'my_unique_constraint'

如何实施@UniqueConstraint，以免出现此类错误。

Answer 1

您收到此错误是因为您的uniqueConstraints未分开。

所以我的方法是将两个约束分开：

@Table(
    name = "test_table",
    uniqueConstraints = {
            @UniqueConstraint(columnNames = "other_table_id"),
            @UniqueConstraint(columnNames = "sort_order")
    },
        name = "my_unique_constraint")
)

hibernate两列唯一索引无法更新值

1 个答案: