mysql – 键’PRIMARY’的重复条目’…’

public class NonceId implements Serializable {

    public static NonceId newInstance(final String udid,final String nonce) {
        if (udid == null) {
            throw new IllegalArgumentException("null udid");
        }
        if (nonce == null) {
            throw new IllegalArgumentException("null nonce");
        }
        final NonceId instance = new NonceId();
        instance.udid = udid;
        instance.nonce = nonce;
        return instance;
    }

    @Override
    public int hashCode() {
        int hash = 7;
        hash = 23 * hash + (this.udid != null ? this.udid.hashCode() : 0);
        hash = 23 * hash + (this.nonce != null ? this.nonce.hashCode() : 0);
        return hash;
    }

    @Override
    public boolean equals(Object obj) {
        if (obj == null) {
            return false;
        }
        if (getClass() != obj.getClass()) {
            return false;
        }
        final NonceId other = (NonceId) obj;
        if ((this.udid == null) ? (other.udid != null) : !this.udid.equals(other.udid)) {
            return false;
        }
        if ((this.nonce == null) ? (other.nonce != null) : !this.nonce.equals(other.nonce)) {
            return false;
        }
        return true;
    }

    @Override
    public String toString() {
        return udid + "/" + nonce;
    }

    private String udid;

    private String nonce;
}

实体类.

@Entity
@IdClass(NonceId.class)
@Table(name = "NONCE2")
@XmlTransient
public class Nonce2 implements Serializable {

    public static final int UDID_SIZE_MIN = 1;
    public static final int UDID_SIZE_MAX = 255;
    public static final int NONCE_SIZE_MIN = 1;
    public static final int NONCE_SIZE_MAX = 255;

    public static Nonce2 newInstance(final String udid,final String nonce) {
        if (nonce == null) {
            throw new NullPointerException("null value");
        }
        final Nonce2 instance = new Nonce2();
        instance.udid = udid;
        instance.nonce = nonce;
        return instance;
    }

    public Date getCreatedDate() {
        return createdDate;
    }

    public String getUdid() {
        return udid;
    }

    public String getNonce() {
        return nonce;
    }

    @PrePersist
    protected void _PrePersist() {
        createdDate = new Date();
    }

    @Override
    public String toString() {
        return udid + "/" + nonce;
    }

    @Column(name = "CREATED_DATE",nullable = false,updatable = false)
    @Temporal(TemporalType.TIMESTAMP)
    @NotNull
    private Date createdDate;

    @Id
    @Column(name = "UDID",updatable = false)
    @NotNull
    @Size(min = UDID_SIZE_MIN,max = UDID_SIZE_MAX)
    private String udid;

    @Id
    @Column(name = "NONCE",updatable = false)
    @NotNull
    @Size(min = NONCE_SIZE_MIN,max = NONCE_SIZE_MAX)
    private String nonce;
}

在我的过滤器中我做到了

@WebFilter(urlPatterns = {"/*"})
public class Filter_ implements Filter {

    @Override
    public void doFilter(final ServletRequest request,final ServletResponse response,final FilterChain chain)
        throws IOException,ServletException {

        // check whether nonce is already exist via em.find();

        chain.doFilter(request,response);

        // store nonce via em.persist(); // EXCEPTION IS HERE
        // THERE IS NO SUCH RECORD check direct SQL console.
    }
}

我的JPA提供程序似乎执行此语句.

INSERT INTO NONCE2 (NONCE,?)

可能是您尝试在同一会话期间批量插入记录.并且批处理可能包含所述键列的重复条目.请检查一下.

另外,请发布带有示例数据的插入代码.

（编辑：晋中站长网）

【声明】本站内容均来自网络，其相关言论仅代表作者个人观点，不代表本站立场。若无意侵犯到您的权利，请及时与联系站长删除相关内容!