JPA 查询未返回预期的结果集

Question

在我工作的一个项目中，我们有一个带有多个实体的持久性单元的 ejb，但最近我们必须更新一些具有复杂 ID（2 个字段组成该 ID）的实体，并且通过此更改，查询不会以我们期望的方式行事。我们有这个实体对应于一个中间体 table，其中一个实体发生了多对一的关系。

publicic class BapeConvCateZonas implements Serializable {

private static final long serialVersionUID = 1L;
@Size(max = 1)
@Column(name = "B_INTERINIDAD")
private String bInterinidad;
@Size(max = 1)
@Column(name = "B_SUSTIT_LARGA")
private String bSustitLarga;
@Size(max = 1)
@Column(name = "B_SUSTIT_CORTA")
private String bSustitCorta;
@Id
@Basic(optional = false)
@NotNull
@Column(name = "C_CODIGO")
private Long cCodigo;
@JoinColumns({
    @JoinColumn(name = "C_COD_GSA", referencedColumnName = "C_COD_GSA", updatable=false,insertable=false),
    @JoinColumn(name = "C_COD_CENTRO", referencedColumnName = "C_CODIGO", updatable=false,insertable=false)})

@ManyToOne
private BapeCentrossanitarios bapeCentrossanitarios;
@JoinColumns({
    @JoinColumn(name = "C_COD_CONV", referencedColumnName = "C_COD_CONV"),
    @JoinColumn(name = "C_COD_CATE", referencedColumnName = "C_COD_CATE")})
@ManyToOne(optional = false)
private BapeConvCateTopes bapeConvCateTopes;
@JoinColumns({
    @JoinColumn(name = "C_COD_GSA", referencedColumnName = "C_COD_GSA", updatable=false,insertable=false),
    @JoinColumn(name = "C_COD_CENTRO", referencedColumnName = "C_COD_CENTRO", updatable=false,insertable=false),
    @JoinColumn(name = "C_COD_DEPTO", referencedColumnName = "C_CODIGO", updatable=false,insertable=false)})

@ManyToOne
private BapeDeptSanitarios bapeDeptSanitarios;
@JoinColumn(name = "C_COD_GSA", referencedColumnName = "C_CODIGO", updatable=false,insertable=false)
@ManyToOne
private BapeGerenciasaludarea cCodGsa;

并且实体发生了变化：

public class BapeCentrossanitarios implements Serializable {

@OneToMany(mappedBy = "bapeCentrossanitarios")
private List<BapeConvCateZonas> bapeConvCateZonasList;

private static final long serialVersionUID = 1L;
@EmbeddedId
protected BapeCentrossanitariosPK bapeCentrossanitariosPK;
@Basic(optional = false)
@NotNull
@Size(min = 1, max = 150)
@Column(name = "A_DESCRIPCION")
private String aDescripcion;
@JoinColumn(name = "C_COD_GSA", referencedColumnName = "C_CODIGO", insertable = false, updatable = false)
@ManyToOne(optional = false)
private BapeGerenciasaludarea bapeGerenciasaludarea;
@OneToMany(cascade = CascadeType.ALL, mappedBy = "bapeCentrossanitarios")
private List<BapeDeptSanitarios> bapeDeptSanitariosList;

此实体中的 ID 更改自：

@Id
@Basic(optional = false)
@NotNull
@Size(min = 1, max = 4)
@Column(name = "C_CODIGO")
private String cCodigo;

收件人：

@EmbeddedId
protected BapeCentrossanitariosPK bapeCentrossanitariosPK;

并且：

@Embeddable

public class BapeCentrossanitariosPK 实现序列化 {

@Basic(optional = false)
@NotNull
@Size(min = 1, max = 4)
@Column(name = "C_CODIGO")
private String cCodigo;
@Basic(optional = false)
@NotNull
@Size(min = 1, max = 4)
@Column(name = "C_COD_GSA")
private String cCodGsa;

当我执行这个查询时 returns 没有任何东西：

SQL: select u from BapeConvCateZonas u where u.bapeConvCateTopes.bapeConvCateTopesPK.cCodConv=:convocatoria and u.bapeConvCateTopes.bapeConvCateTopesPK.cCodCate=:categoria and u.bapeCentrossanitarios is null and u.bInterinidad='S' order by u.cCodGsa.cCodigo ASC;

BapeConvCateTopes 实体： public class BapeConvCateTopes 实现序列化 {

    @Column(name = "N_ANIO_FINALIZACION")
    private Short nAnioFinalizacion;
    @JoinTable(name = "BAPE_CONV_CATE_MERI_SUB", joinColumns = {
        @JoinColumn(name = "C_COD_CONV", referencedColumnName = "C_COD_CONV"),
        @JoinColumn(name = "C_COD_CATE", referencedColumnName = "C_COD_CATE")}, inverseJoinColumns = {
        @JoinColumn(name = "C_COD_AREA", referencedColumnName = "C_COD_AREA"),
        @JoinColumn(name = "C_COD_TIPO", referencedColumnName = "C_COD_TIPO"),
        @JoinColumn(name = "C_COD_SUBTIPO", referencedColumnName = "C_CODIGO")})
    @ManyToMany
    @OrderBy("bapeMeritosSubtiposPK.cCodArea ASC")
    private List<BapeMeritosSubtipos> bapeMeritosSubtiposList;

    @JoinTable(name = "BAPE_CONV_CATE_TITU_EXPE", joinColumns = {
        @JoinColumn(name = "C_COD_CONV", referencedColumnName = "C_COD_CONV"),
        @JoinColumn(name = "C_COD_CATE", referencedColumnName = "C_COD_CATE")}, inverseJoinColumns = {
        @JoinColumn(name = "C_COD_TITU", referencedColumnName = "C_CODIGO")})
    @ManyToMany
    private List<BapeTitulaExper> bapeTitulaExperCollection;
    @JoinColumn(name = "C_COD_CONV", referencedColumnName = "C_CODIGO", insertable = false, updatable = false)
    @ManyToOne(optional = false)
    private BapeConvocatorias bapeConvocatorias;
    @JoinColumn(name = "C_COD_CATE", referencedColumnName = "C_CODIGO", insertable = false, updatable = false)
    @ManyToOne(optional = false)
    private BapeCategorias bapeCategorias;

    private static final long serialVersionUID = 1L;
    @EmbeddedId
    protected BapeConvCateTopesPK bapeConvCateTopesPK;
    @Basic(optional = false)
    @NotNull
    @Size(min = 1, max = 1)
    @Column(name = "B_ACTIVO")
    private String bActivo;
    @Basic(optional = false)
    @NotNull
    @Size(min = 1, max = 1)
    @Column(name = "B_NOTIF_AUTOMATICA")
    private String bNotifAutomatica;
    // @Max(value=?)  @Min(value=?)//if you know range of your decimal fields consider using these annotations to enforce field validation
    @Column(name = "TOPE")
    private BigDecimal tope;
    @OneToMany(cascade = CascadeType.REFRESH, mappedBy = "bapeConvCateTopes")
    @OrderColumn(name="C_COD_GSA")
    private List<BapeConvCateZonas> bapeConvCateZonasList;

和 BapeConvCateTopesPK：

@Embeddable
public class BapeConvCateTopesPK implements Serializable {

    @Basic(optional = false)
    @NotNull
    @Column(name = "C_COD_CONV")
    private long cCodConv;
    @Basic(optional = false)
    @NotNull
    @Column(name = "C_COD_CATE")
    private long cCodCate;

table 有符合条件的值。根据上次更改，它必须与关系和复杂 ID 相关，但我不放弃掌握可能是什么。编辑：添加了更多关于 ID 更改的信息。

Answer 1

虽然您的 ID 更改混淆了问题，但使用的 JPQL 不正确。具体来说，“u.bapeCentrossanitarios 为空”强制对表进行内部联接。由于内部联接会过滤掉空值，因此该子句永远不会为真，因此不会返回任何结果。

查询应该对此关系使用左外连接。类似于：

"select u from BapeConvCateZonas u left outer join u.bapeCentrossanitarios bapeCentrossanitarios where u.bapeConvCateTopes.bapeConvCateTopesPK.cCodConv=:convocatoria and u.bapeConvCateTopes.bapeConvCateTopesPK.cCodCate=:categoria and bapeCentrossanitarios is null and u.bInterinidad='S' order by u.cCodGsa.cCodigo ASC"

会起作用，尽管可能有很多方法可以形成类似的查询。

它可能首先起作用的原因是您对复合 PK 的更改可能会绕过 EclipseLink 优化，该优化允许它在不执行连接的情况下评估 'u.bapeCentrossanitarios is Null' - 它可以只检查 pk 值，如果它是空的。随着变化，一个或多个外键可能为空，也可能不为空（它们不受映射控制），因此它必须连接表才能确定。

JPA 查询未返回预期的结果集

JPA query not returning expected result set

java

jpa

eclipselink

jpql