Question

我的应用程序正在使用Hibernate + Sybase。执行查询时，出现以下错误

Caused by: java.sql.SQLException: The identifier that starts with 'decision_engine_timestamp16_10' is too long. Maximum length is 30.

我在该表中名为decision_engine_timestamp的列是＆lt; 30.但是为什么Hibernate在定义的列名后追加16_10？甚至decision_engine_timestamp16_10 = 30。

我无法更改表列名称。我使用TypedQuery而不是特定的查询来搜索表。错误发生在下面指定的行上：

public static final <S extends Serializable, M> PageResult<M> findByPage(EntityManager em,
                                                                         WhereBuilder<S, M> whereBuilder, S searchCriteria, Class<M> modelClass, PageRequest pageRequest) {
    CriteriaBuilder criteriaBuilder = em.getCriteriaBuilder();

    CriteriaQuery<M> contentCriteriaQuery = criteriaBuilder.createQuery(modelClass);
    Root<M> contentRoot = contentCriteriaQuery.from(modelClass);
    contentCriteriaQuery.select(contentRoot);

    if (searchCriteria != null) {
        contentCriteriaQuery.where(whereBuilder.build(searchCriteria, criteriaBuilder, contentRoot));
        if (pageRequest != null && pageRequest.getOrders() != null) {
            contentCriteriaQuery.orderBy(QueryUtils.toOrders(pageRequest.getSort(), contentRoot, criteriaBuilder));
        }
    }
    TypedQuery<M> contentQuery = em.createQuery(contentCriteriaQuery);

    if (pageRequest != null) {
        CriteriaQuery<Long> totalCriteriaQuery = criteriaBuilder.createQuery(Long.class);
        Root<M> totalRoot = totalCriteriaQuery.from(modelClass);
        totalCriteriaQuery.select(criteriaBuilder.count(totalRoot));
        if (searchCriteria != null) {
            totalCriteriaQuery.where(whereBuilder.build(searchCriteria, criteriaBuilder, totalRoot));
        }
        TypedQuery<Long> totalQuery = em.createQuery(totalCriteriaQuery);
        contentQuery.setFirstResult(pageRequest.getOffset());
        contentQuery.setMaxResults(pageRequest.getPageSize());

        List<M> resultList = contentQuery.getResultList();//--error occurs here
        if (resultList == null) {
            resultList = new ArrayList<M>();
        }
        int total = totalQuery.getSingleResult().intValue();
        return new PageResult<M>(resultList, pageRequest, total);
    } else {
        List<M> resultList = contentQuery.getResultList();
        if (resultList == null) {
            resultList = new ArrayList<M>();
        }
        return new PageResult<M>(resultList);
    }
}

选择locaterequ0_.id为id1_10_，locaterequ0_.created_by为created_by2_10_，locaterequ0_.created_on为created_on3_10_，locaterequ0_.updated_by为updated_by4_10_，locaterequ0_.updated_on为updated_on5_10_，locaterequ0_.version为version6_10_，locaterequ0_.asset_code为asset_code7_10_，locaterequ0_.asset_country as asset_country8_10_，locaterequ0_.asset_full_name如asset_full_name9_10_，locaterequ0_.ccn如ccn10_10_，locaterequ0_.client_long_name如client_long_name11_10_，locaterequ0_.client_short_name如client_short_name12_10_，locaterequ0_.comment如comment13_10_，locaterequ0_.decision_engine_comment如decision_engine_comment14_10_，locaterequ0_.decision_engine_result如decision_engine_result15_10_，locaterequ0_.decision_engine_timestamp如decision_engine_timestamp16_10_， locaterequ0_.decision_strategy as decision_strategy17_10_，locaterequ0_.fee as fee18_10_，locaterequ0_.final_decision as final_decision19_10_，locaterequ0_.final_decision_inv_type as final_decision_i nv_type20_10_，locaterequ0_.final_decision_source如final_decision_source21_10_，locaterequ0_.final_decision_timestamp如final_decision_timestamp22_10_，locaterequ0_.final_decision_user如final_decision_user23_10_，locaterequ0_.locate_type如locate_type24_10_，locaterequ0_.is_long_sell_locate如is_long_sell_locate25_10_，locaterequ0_.narrative如narrative26_10_，locaterequ0_.quantity如quantity27_10_，locaterequ0_.reply_event_id如reply_event_id28_10_， locaterequ0_.reply_timestamp如reply_timestamp29_10_，locaterequ0_.reply_user如reply_user30_10_，locaterequ0_.request_event_id如request_event_id31_10_，locaterequ0_.request_group如request_group32_10_，locaterequ0_.request_quantity如request_quantity33_10_，locaterequ0_.request_ticker如request_ticker34_10_，locaterequ0_.request_ticker_desc如request_ticker_desc35_10_，locaterequ0_.request_ticker_type如request_ticker_type36_10_，locaterequ0_。 request_timestamp as request_timestamp37_10_，locaterequ0_.ric as ric38_10_，l ocaterequ0_.security_id如security_id39_10_，locaterequ0_.sedol如sedol40_10_，locaterequ0_.source_id如source_id41_10_，locaterequ0_.source_item如source_item42_10_，locaterequ0_.source_item_key如source_item_key43_10_，locaterequ0_.source_system如source_system44_10_，locaterequ0_.ticker如ticker45_10_，locaterequ0_.used_quantity如used_quantity46_10_，locaterequ0_。 valid_till_timestamp as valid_till_timestamp47_10_来自gsf_locate_request locaterequ0_ where（locaterequ0_.final_decision为null）和（locaterequ0_.request_group in（？，？，？，？，？，？，？，？，？，？，？，？，？，？，？，？，？，？，？，？，？，？））来自locaterequ0_.id asc

Answer 1

在Oracle中，任何数据库对象名称（例如表，列，别名）的长度必须为at most 30 bytes。 Sybase has the same limitation也是。

Hibernate必须对列名使用唯一的别名，因为查询可能使用自连接，然后SELECT子句将选择哪一列是不明确的。

列别名由AliasGenerator生成，不可配置，因此您需要使用较短的列名。确保列名称最多为24个字符，因为hibernate会添加计数器后缀以确保唯一性（例如35_10_）。

Answer 2

这对我有用：

spring.jpa.databasePlatform=org.hibernate.dialect.SybaseDialect

java.sql.SQLException：以＆＃39; xxxx＆＃39;开头的标识符太长。最大长度为30

2 个答案: