java - 持久化对象时出现 NonUniqueObjectException

Question

大家好，我在尝试将对象数组写入数据库时​​遇到了 Hibernate 问题。重要的是我有一个从 Web 服务查询构建的对象。这个对象“响应”最多可以包含十个“未付费项目”，当我尝试保留这些项目时，就会出现问题。

实体:

@Entity
@Table(name="TABLE_NAME")
public class AccountDetailsRROutput implements Serializable {
    private static final long serialVersionUID = 1L;

    @Id

    private String payeename;

    private String typeunpd;

    private BigDecimal unpdamt;

    @Column(name="TRANSACTION_ID")
    private long transactionId;

    public AccountDetailsRROutput() {
        super();
    }

    // plus all get/sets
}



        //================================================================
        //  Populate the output for the repeating rows table
        //  which can contain a maximum of 10 unpaid items
        //===============================================================
        AccountDetailsRROutput outputRRTable[] = new AccountDetailsRROutput[response.getLineItems().length];

        LOGGER.debug(METHOD_NAME, "Loop through the line items");
        for (int i = 0; i < response.getLineItems().length; i++) {

            //================================================================
            //  Ensure that we have an item so we don't write an empty row
            //================================================================
            if (response.getLineItems()[i].getTypeunpd() == null || response.getLineItems()[i].getTypeunpd() == "") {
                LOGGER.debug(METHOD_NAME, "No unpaid item entry so break out of the the loop");
                break;
            }
            else {
                LOGGER.debug(METHOD_NAME, "We've got an unpaid item so add the details to the DB");

                outputRRTable[i] = new AccountDetailsRROutput();

                outputRRTable[i].setTransactionId(iTransactionID);
                outputRRTable[i].setTypeunpd(response.getLineItems()[i].getTypeunpd());
                outputRRTable[i].setPayeename(response.getLineItems()[i].getPayeeName());
                outputRRTable[i].setUnpdAmt(response.getLineItems()[i].getUnpdAmt());

                //================================================================
                //  Persist the output list DB object
                //================================================================
                LOGGER.debug(METHOD_NAME, "Persist repeating rows table DB object for line item: " + (i+1));
                em_i.persist(outputRRTable[i]);             
            }
        }
    LOGGER.debug(METHOD_NAME, "Finished persisting repeating rows table DB object");
    em_i.flush();

当我尝试此操作时，出现以下错误:

org.hibernate.NonUniqueObjectException:具有相同标识符值的不同对象已与 session 关联:

我可以通过将 emi.persist 更改为 emi.merge 来解决这个问题，但它只是将一个元素写入数据库。该表中可以有重复记录，不存在pk。

Answer 1

您可能有不止一件商品具有相同的收款人姓名。尝试定义另一个 id(例如由 payeename 和 transactionID 组成的 id)。