Hibernate 已返回零结果，但本机 sql 返回不同

Posted 2023-02-24

【中文标题】Hibernate 已返回零结果，但本机 sql 返回不同

【英文标题】：Hibernate has returns the zero results but native sql returns different

【发布时间】：2016-11-10 01:13:43

【问题描述】：

我想知道为什么我的hibernait查询和sql的结果不同？我映射错了吗？ Java 休眠没有例外。在这种情况下，我使用 Oracle 11 数据库和 hibernate 3.5。

我有下一个休眠实体：

@Table(name = "pat_otb_registry")
public class OtbEntity implements Comparable<OtbEntity> 

    @Column(name = "legal_address_region")
    private BigDecimal legalAddressRegion;

    @Column(name = "declarant")
    private String declarant;

    @Column(name = "registry_cert_number")
    private String registryCertNumber;

    @Column(name = "decision_to_grant_date")
    private Date decisionToGrantDate;

    @Column(name = "competent_authority")
    private BigDecimal competentAuthority;

    @Column(name = "expiry_date")
    private Date expiryDate;

    @Column(name = "decision_to_grant_number")
    private String decisionToGrantNumber;

    @Column(name = "decision_to_cancel_number")
    private String decisionToCancelNumber;

    @Column(name = "decision_to_exclude_number")
    private String decisionToExcludeNumber;

    @Column(name = "certification_authority")
    private String certificationAuthority;

    @Column(name = "appraisee")
    private String appraisee;

    @Column(name = "date_of_end_stage")
    private Date dateOfEndStage;

    @Column(name = "certification_field")
    private String certificationField;

    @Column(name = "validity_years")
    private BigDecimal validityYears;

    @Column(name = "decision_to_extend_number")
    private String decisionToExtendNumber;

    @Column(name = "issue_date")
    private Date issueDate;

    @Column(name = "reason")
    private String reason;

    @Column(name = "decision_to_cancel_date")
    private Date decisionToCancelDate;

    @Column(name = "decision_to_exclude_date")
    private Date decisionToExcludeDate;

    @Column(name = "decision_to_extend_date")
    private Date decisionToExtendDate;

    @Column(name = "extended_to_date")
    private Date extendedToDate;

    @Column(name = "oa_registry_number")
    private String oaRegistryNumber;

    @Column(name = "grounds_for_issue")
    private String groundsForIssue;

    @Column(name = "doc_num")
    private String docNum;
// then getters and setters....

SQL 表：

CREATE TABLE pat_otb_registry (
    legal_address_region number(10,0)  NULL,
    declarant nvarchar2(2000)  NOT NULL,
    registry_cert_number nvarchar2(2000)  NOT NULL,
    decision_to_grant_date date  NULL,
    competent_authority smallint  NOT NULL,
    expiry_date date  NULL,
    decision_to_grant_number nvarchar2(2000)  NULL,
    decision_to_cancel_number nvarchar2(2000)  NULL,
    decision_to_exclude_number nvarchar2(2000)  NULL,
    certification_authority nvarchar2(2000)  NOT NULL,
    appraisee varchar2(2000)  NOT NULL,
    date_of_end_stage date  NULL,
    certification_field nvarchar2(2000)  NULL,
    validity_years integer  NULL,
    decision_to_extend_number nvarchar2(2000)  NULL,
    issue_date date  NULL,
    reason nvarchar2(2000)  NULL,
    decision_to_cancel_date date  NULL,
    decision_to_exclude_date date  NULL,
    decision_to_extend_date date  NULL,
    extended_to_date date  NULL,
    oa_registry_number nvarchar2(2000)  NULL,
    grounds_for_issue nvarchar2(2000)  NULL,
    doc_num nvarchar2(2000)  NULL,
    CONSTRAINT pat_otb_registry_pk PRIMARY KEY (registry_cert_number)
) ;

休眠查询：

getEntityManager().createQuery("SELECT o FROM " + getEntityName() + " o").getResultList()

SQL 查询：

getEntityManager().createNativeQuery("select * from pat_otb_registry")

【问题讨论】：

除了我没有看到你的主键的@Id 注释，它看起来对我来说还可以。我没有耐心检查所有列名，但我认为如果命名错误，它应该在部署期间抱怨。

本机 SQL 查询和休眠请求的一些示例肯定有助于理解问题

直觉告诉我，这与使用 NVARCHAR2 列作为主键的选择/原因有关。涉及的所有相关字符集是什么？

请将休眠和原生 SQL 查询附加到问题中。

没有@Id，因为它是仅供阅读的表格，我检查了所有名称，并且名称相等...

【参考方案1】：

我发现了一个错误。我没有正常工作EntityManager - getEntityManager()