Java 使用@SecondaryTables显示来自beers表、categories表和styles表的所有数据

我试图在列表中显示beers表中的所有数据对象，在向下钻取中，要显示所有beers数据及其对应的类别名称（来自类别表）和对应的样式名称（来自样式表），它会从beer表的style id和category id列中获取这些结果

我尝试过使用@SecondaryTables注释，如图所示，但在啤酒列表中，它只显示10瓶啤酒，这是类别名称的数量，因此它弄乱了它的映射方式。 下面是我的尝试

这就是我添加到JPA类中的内容，正确的解决方案是什么

 @Table(name = "beers")
        @SecondaryTables({
        @SecondaryTable(name = "categories"),
        @SecondaryTable(name = "styles")})


@Column(table = "categories", name = "cat_name")
private String catName;

@Column(table = "styles", name = "style_name")
private String styleName;



  public String getCatName() {
        return catName;
    }

    public void setCatName(String catName) {
        this.catName = catName;
    }

    public String getStyleName() {
        return styleName;
    }

    public void setStyleName(String styleName) {
        this.styleName = styleName;
    }

这是ER图中表格的图片

以下是beers.java JPA供额外参考

@Entity
@Table(name = "beers")
@SecondaryTables({
    @SecondaryTable(name = "categories"),
    @SecondaryTable(name = "styles")})
@XmlRootElement
@NamedQueries({
    @NamedQuery(name = "Beers.findAll", query = "SELECT b FROM Beers b"),
    @NamedQuery(name = "Beers.findById", query = "SELECT b FROM Beers b WHERE b.id = :id"),
    @NamedQuery(name = "Beers.findByLikeName", query = "SELECT b FROM Beers b WHERE b.name LIKE CONCAT('%',:name,'%')"),
    @NamedQuery(name = "Beers.findByBreweryId", query = "SELECT b FROM Beers b WHERE b.breweryId = :breweryId"),
    @NamedQuery(name = "Beers.findByName", query = "SELECT b FROM Beers b WHERE b.name = :name"),
    @NamedQuery(name = "Beers.findByCatId", query = "SELECT b FROM Beers b WHERE b.catId = :catId"),
    @NamedQuery(name = "Beers.findByStyleId", query = "SELECT b FROM Beers b WHERE b.styleId = :styleId"),
    @NamedQuery(name = "Beers.findByAbv", query = "SELECT b FROM Beers b WHERE b.abv = :abv"),
    @NamedQuery(name = "Beers.findByIbu", query = "SELECT b FROM Beers b WHERE b.ibu = :ibu"),
    @NamedQuery(name = "Beers.findBySrm", query = "SELECT b FROM Beers b WHERE b.srm = :srm"),
    @NamedQuery(name = "Beers.findByAddUser", query = "SELECT b FROM Beers b WHERE b.addUser = :addUser"),
    @NamedQuery(name = "Beers.findByLastMod", query = "SELECT b FROM Beers b WHERE b.lastMod = :lastMod"),
    @NamedQuery(name = "Beers.findByBuyPrice", query = "SELECT b FROM Beers b WHERE b.buyPrice = :buyPrice"),
    @NamedQuery(name = "Beers.findBySellPrice", query = "SELECT b FROM Beers b WHERE b.sellPrice = :sellPrice")})
public class Beers implements Serializable {

    private static final long serialVersionUID = 1L;
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    @Basic(optional = false)
    @Column(name = "id")
    private Integer id;
    @Basic(optional = false)
    @NotNull
    @Column(name = "brewery_id")
    private int breweryId;
    @Basic(optional = false)
    @NotNull
    @Size(min = 1, max = 255)
    @Column(name = "name")
    private String name;
    @Basic(optional = false)
    @NotNull
    @Column(name = "cat_id")
    private int catId;
    @Basic(optional = false)
    @NotNull
    @Column(name = "style_id")
    private int styleId;
    @Basic(optional = false)
    @NotNull
    @Column(name = "abv")
    private float abv;
    @Basic(optional = false)
    @NotNull
    @Column(name = "ibu")
    private float ibu;
    @Basic(optional = false)
    @NotNull
    @Column(name = "srm")
    private float srm;
    @Basic(optional = false)
    @NotNull
    @Lob
    @Size(min = 1, max = 65535)
    @Column(name = "description")
    private String description;
    @Basic(optional = false)
    @NotNull
    @Column(name = "add_user")
    private int addUser;
    @Basic(optional = false)
    @NotNull
    @Column(name = "last_mod")
    @Temporal(TemporalType.TIMESTAMP)
    private Date lastMod;
    @Basic(optional = false)
    @NotNull
    @Lob
    @Size(min = 1, max = 65535)
    @Column(name = "image")
    private String image;
    @Basic(optional = false)
    @NotNull
    @Column(name = "buy_price")
    private double buyPrice;
    @Basic(optional = false)
    @NotNull
    @Column(name = "sell_price")
    private double sellPrice;

    @Column(table = "categories", name = "cat_name")
    private String catName;

    @Column(table = "styles", name = "style_name")
    private String styleName;

    public String getCatName() {
        return catName;
    }

    public void setCatName(String catName) {
        this.catName = catName;
    }

    public String getStyleName() {
        return styleName;
    }

    public void setStyleName(String styleName) {
        this.styleName = styleName;
    }

    public Beers() {
    }

    public Beers(Integer id) {
        this.id = id;
    }

    public Beers(Integer id, int breweryId, String name, int catId, int styleId, float abv, float ibu, float srm, String description, int addUser, Date lastMod, String image, double buyPrice, double sellPrice, String catName) {
        this.id = id;
        this.breweryId = breweryId;
        this.name = name;
        this.catId = catId;
        this.styleId = styleId;
        this.abv = abv;
        this.ibu = ibu;
        this.srm = srm;
        this.description = description;
        this.addUser = addUser;
        this.lastMod = lastMod;
        this.image = image;
        this.buyPrice = buyPrice;
        this.sellPrice = sellPrice;
          this.catName = catName;
    }

    public Integer getId() {
        return id;
    }

    public void setId(Integer id) {
        this.id = id;
    }

    public int getBreweryId() {
        return breweryId;
    }

    public void setBreweryId(int breweryId) {
        this.breweryId = breweryId;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public int getCatId() {
        return catId;
    }

    public void setCatId(int catId) {
        this.catId = catId;
    }

    public int getStyleId() {
        return styleId;
    }

    public void setStyleId(int styleId) {
        this.styleId = styleId;
    }

    public float getAbv() {
        return abv;
    }

    public void setAbv(float abv) {
        this.abv = abv;
    }

    public float getIbu() {
        return ibu;
    }

    public void setIbu(float ibu) {
        this.ibu = ibu;
    }

    public float getSrm() {
        return srm;
    }

    public void setSrm(float srm) {
        this.srm = srm;
    }

    public String getDescription() {
        return description;
    }

    public void setDescription(String description) {
        this.description = description;
    }

    public int getAddUser() {
        return addUser;
    }

    public void setAddUser(int addUser) {
        this.addUser = addUser;
    }

    public Date getLastMod() {
        return lastMod;
    }

    public void setLastMod(Date lastMod) {
        this.lastMod = lastMod;
    }

    public String getImage() {
        return image;
    }

    public void setImage(String image) {
        this.image = image;
    }

    public double getBuyPrice() {
        return buyPrice;
    }

    public void setBuyPrice(double buyPrice) {
        this.buyPrice = buyPrice;
    }

    public double getSellPrice() {
        return sellPrice;
    }

    public void setSellPrice(double sellPrice) {
        this.sellPrice = sellPrice;
    }

    @Override
    public int hashCode() {
        int hash = 0;
        hash += (id != null ? id.hashCode() : 0);
        return hash;
    }

    @Override
    public boolean equals(Object object) {
        // TODO: Warning - this method won't work in the case the id fields are not set
        if (!(object instanceof Beers)) {
            return false;
        }
        Beers other = (Beers) object;
        if ((this.id == null && other.id != null) || (this.id != null && !this.id.equals(other.id))) {
            return false;
        }
        return true;
    }

    @Override
    public String toString() {
        return "brewery.src.model.Beers[ id=" + id + " ]";
    }

}

下面是我尝试使用@manytoone注释的情况

Beers.java


    @Entity
    @Table(name = "beers")


    @XmlRootElement
    @NamedQueries({
        @NamedQuery(name = "Beers.findAll", query = "SELECT b FROM Beers b"),
        @NamedQuery(name = "Beers.findById", query = "SELECT b FROM Beers b WHERE b.id = :id"),
        @NamedQuery(name = "Beers.findByLikeName", query = "SELECT b FROM Beers b WHERE b.name LIKE CONCAT('%',:name,'%')"),
        @NamedQuery(name = "Beers.findByBreweryId", query = "SELECT b FROM Beers b WHERE b.breweryId = :breweryId"),
        @NamedQuery(name = "Beers.findByName", query = "SELECT b FROM Beers b WHERE b.name = :name"),
        @NamedQuery(name = "Beers.findByCatId", query = "SELECT b FROM Beers b WHERE b.catId = :catId"),
        @NamedQuery(name = "Beers.findByStyleId", query = "SELECT b FROM Beers b WHERE b.styleId = :styleId"),
        @NamedQuery(name = "Beers.findByAbv", query = "SELECT b FROM Beers b WHERE b.abv = :abv"),
        @NamedQuery(name = "Beers.findByIbu", query = "SELECT b FROM Beers b WHERE b.ibu = :ibu"),
        @NamedQuery(name = "Beers.findBySrm", query = "SELECT b FROM Beers b WHERE b.srm = :srm"),
        @NamedQuery(name = "Beers.findByAddUser", query = "SELECT b FROM Beers b WHERE b.addUser = :addUser"),
        @NamedQuery(name = "Beers.findByLastMod", query = "SELECT b FROM Beers b WHERE b.lastMod = :lastMod"),
        @NamedQuery(name = "Beers.findByBuyPrice", query = "SELECT b FROM Beers b WHERE b.buyPrice = :buyPrice"),
        @NamedQuery(name = "Beers.findBySellPrice", query = "SELECT b FROM Beers b WHERE b.sellPrice = :sellPrice")})
    public class Beers implements Serializable {
      @ManyToOne(fetch=FetchType.LAZY)
      @JoinColumn(name="styleId")
        private static final long serialVersionUID = 1L;
        @Id
        @GeneratedValue(strategy = GenerationType.IDENTITY)
        @Basic(optional = false)
        @Column(name = "id")
        private Integer id;
        @Basic(optional = false)
        @NotNull
        @Column(name = "brewery_id")
        private int breweryId;
        @Basic(optional = false)
        @NotNull
        @Size(min = 1, max = 255)
        @Column(name = "name")
        private String name;
        @Basic(optional = false)
        @NotNull
        @Column(name = "cat_id")
        private int catId;
        @Basic(optional = false)
        @NotNull
        @Column(name = "style_id")
        private int styleId;
        @Basic(optional = false)
        @NotNull
        @Column(name = "abv")
        private float abv;
        @Basic(optional = false)
        @NotNull
        @Column(name = "ibu")
        private float ibu;
        @Basic(optional = false)
        @NotNull
        @Column(name = "srm")
        private float srm;
        @Basic(optional = false)
        @NotNull
        @Lob
        @Size(min = 1, max = 65535)
        @Column(name = "description")
        private String description;
        @Basic(optional = false)
        @NotNull
        @Column(name = "add_user")
        private int addUser;
        @Basic(optional = false)
        @NotNull
        @Column(name = "last_mod")
        @Temporal(TemporalType.TIMESTAMP)
        private Date lastMod;
        @Basic(optional = false)
        @NotNull
        @Lob
        @Size(min = 1, max = 65535)
        @Column(name = "image")
        private String image;
        @Basic(optional = false)
        @NotNull
        @Column(name = "buy_price")
        private double buyPrice;
        @Basic(optional = false)
        @NotNull
        @Column(name = "sell_price")
        private double sellPrice;

        @Column(table = "categories", name = "cat_name")
        private String catName;

        @Column(table = "styles", name = "style_name")
        private String styleName;


        public Beers() {
        }

        public Beers(Integer id) {
            this.id = id;
        }

        public Beers(Integer id, int breweryId, String name, int catId, int styleId, float abv, float ibu, float srm, String description, int addUser, Date lastMod, String image, double buyPrice, double sellPrice) {
            this.id = id;
            this.breweryId = breweryId;
            this.name = name;
            this.catId = catId;
            this.styleId = styleId;
            this.abv = abv;
            this.ibu = ibu;
            this.srm = srm;
            this.description = description;
            this.addUser = addUser;
            this.lastMod = lastMod;
            this.image = image;
            this.buyPrice = buyPrice;
            this.sellPrice = sellPrice;


        }

        public Integer getId() {
            return id;
        }

        public void setId(Integer id) {
            this.id = id;
        }

        public int getBreweryId() {
            return breweryId;
        }

        public void setBreweryId(int breweryId) {
            this.breweryId = breweryId;
        }

        public String getName() {
            return name;
        }

        public void setName(String name) {
            this.name = name;
        }

        public int getCatId() {
            return catId;
        }

        public void setCatId(int catId) {
            this.catId = catId;
        }

        public int getStyleId() {
            return styleId;
        }

        public void setStyleId(int styleId) {
            this.styleId = styleId;
        }

        public float getAbv() {
            return abv;
        }

        public void setAbv(float abv) {
            this.abv = abv;
        }

        public float getIbu() {
            return ibu;
        }

        public void setIbu(float ibu) {
            this.ibu = ibu;
        }

        public float getSrm() {
            return srm;
        }

        public void setSrm(float srm) {
            this.srm = srm;
        }

        public String getDescription() {
            return description;
        }

        public void setDescription(String description) {
            this.description = description;
        }

        public int getAddUser() {
            return addUser;
        }

        public void setAddUser(int addUser) {
            this.addUser = addUser;
        }

        public Date getLastMod() {
            return lastMod;
        }

        public void setLastMod(Date lastMod) {
            this.lastMod = lastMod;
        }

        public String getImage() {
            return image;
        }

        public void setImage(String image) {
            this.image = image;
        }

        public double getBuyPrice() {
            return buyPrice;
        }

        public void setBuyPrice(double buyPrice) {
            this.buyPrice = buyPrice;
        }

        public double getSellPrice() {
            return sellPrice;
        }

        public void setSellPrice(double sellPrice) {
            this.sellPrice = sellPrice;
        }
           public String getCatName() {
            return catName;
        }

        public void setCatName(String catName) {
            this.catName = catName;
        }

        public String getStyleName() {
            return styleName;
        }

        public void setStyleName(String styleName) {
            this.styleName = styleName;
        }


        @Override
        public int hashCode() {
            int hash = 0;
            hash += (id != null ? id.hashCode() : 0);
            return hash;
        }

        @Override
        public boolean equals(Object object) {
            // TODO: Warning - this method won't work in the case the id fields are not set
            if (!(object instanceof Beers)) {
                return false;
            }
            Beers other = (Beers) object;
            if ((this.id == null && other.id != null) || (this.id != null && !this.id.equals(other.id))) {
                return false;
            }
            return true;
        }

        @Override
        public String toString() {
            return "brewery.src.model.Beers[ id=" + id + " ]";
        }

catgories.java

@Entity
@Table(name = "categories")
@XmlRootElement
@NamedQueries({
    @NamedQuery(name = "Categories.findAll", query = "SELECT c FROM Categories c"),
    @NamedQuery(name = "Categories.findById", query = "SELECT c FROM Categories c WHERE c.id = :id"),
    @NamedQuery(name = "Categories.findByCatName", query = "SELECT c FROM Categories c WHERE c.catName = :catName"),
    @NamedQuery(name = "Categories.findByLastMod", query = "SELECT c FROM Categories c WHERE c.lastMod = :lastMod")})
public class Categories implements Serializable {
 @OneToMany(mappedBy = "beer")
    private static final long serialVersionUID = 1L;
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    @Basic(optional = false)
    @Column(name = "id")
    private Integer id;
    @Basic(optional = false)
    @NotNull
    @Size(min = 1, max = 255)
    @Column(name = "cat_name")
    private String catName;
    @Basic(optional = false)
    @NotNull
    @Column(name = "last_mod")
    @Temporal(TemporalType.TIMESTAMP)
    private Date lastMod;

    public Categories() {
    }

    public Categories(Integer id) {
        this.id = id;
    }

    public Categories(Integer id, String catName, Date lastMod) {
        this.id = id;
        this.catName = catName;
        this.lastMod = lastMod;
    }

    public Integer getId() {
        return id;
    }

    public void setId(Integer id) {
        this.id = id;
    }

    public String getCatName() {
        return catName;
    }

    public void setCatName(String catName) {
        this.catName = catName;
    }

    public Date getLastMod() {
        return lastMod;
    }

    public void setLastMod(Date lastMod) {
        this.lastMod = lastMod;
    }

    @Override
    public int hashCode() {
        int hash = 0;
        hash += (id != null ? id.hashCode() : 0);
        return hash;
    }

    @Override
    public boolean equals(Object object) {
        // TODO: Warning - this method won't work in the case the id fields are not set
        if (!(object instanceof Categories)) {
            return false;
        }
        Categories other = (Categories) object;
        if ((this.id == null && other.id != null) || (this.id != null && !this.id.equals(other.id))) {
            return false;
        }
        return true;
    }

    @Override
    public String toString() {
        return "brewery.src.model.Categories[ id=" + id + " ]";
    }

}

styles.java

@Entity
@Table(name = "styles")
@XmlRootElement
@NamedQueries({
    @NamedQuery(name = "Styles.findAll", query = "SELECT s FROM Styles s"),
    @NamedQuery(name = "Styles.findById", query = "SELECT s FROM Styles s WHERE s.id = :id"),
    @NamedQuery(name = "Styles.findByCatId", query = "SELECT s FROM Styles s WHERE s.catId = :catId"),
    @NamedQuery(name = "Styles.findByStyleName", query = "SELECT s FROM Styles s WHERE s.styleName = :styleName"),
    @NamedQuery(name = "Styles.findByLastMod", query = "SELECT s FROM Styles s WHERE s.lastMod = :lastMod")})
public class Styles implements Serializable {
  @ManyToOne(fetch=FetchType.LAZY)
  @JoinColumn(name="catId")
  @OneToMany(mappedBy = "beer")
    private static final long serialVersionUID = 1L;
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    @Basic(optional = false)
    @Column(name = "id")
    private Integer id;
    @Basic(optional = false)
    @NotNull
    @Column(name = "cat_id")
    private int catId;
    @Basic(optional = false)
    @NotNull
    @Size(min = 1, max = 255)
    @Column(name = "style_name")
    private String styleName;
    @Basic(optional = false)
    @NotNull
    @Column(name = "last_mod")
    @Temporal(TemporalType.TIMESTAMP)
    private Date lastMod;

    public Styles() {
    }

    public Styles(Integer id) {
        this.id = id;
    }

    public Styles(Integer id, int catId, String styleName, Date lastMod) {
        this.id = id;
        this.catId = catId;
        this.styleName = styleName;
        this.lastMod = lastMod;
    }

    public Integer getId() {
        return id;
    }

    public void setId(Integer id) {
        this.id = id;
    }

    public int getCatId() {
        return catId;
    }

    public void setCatId(int catId) {
        this.catId = catId;
    }

    public String getStyleName() {
        return styleName;
    }

    public void setStyleName(String styleName) {
        this.styleName = styleName;
    }

    public Date getLastMod() {
        return lastMod;
    }

    public void setLastMod(Date lastMod) {
        this.lastMod = lastMod;
    }

    @Override
    public int hashCode() {
        int hash = 0;
        hash += (id != null ? id.hashCode() : 0);
        return hash;
    }

    @Override
    public boolean equals(Object object) {
        // TODO: Warning - this method won't work in the case the id fields are not set
        if (!(object instanceof Styles)) {
            return false;
        }
        Styles other = (Styles) object;
        if ((this.id == null && other.id != null) || (this.id != null && !this.id.equals(other.id))) {
            return false;
        }
        return true;
    }

    @Override
    public String toString() {
        return "brewery.src.model.Styles[ id=" + id + " ]";
    }

}

500错误根本原因

Exception
org.springframework.web.util.NestedServletException: Handler dispatch failed; nested exception is java.lang.ExceptionInInitializerError
    org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1006)
    org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:925)
    org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:978)
    org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:870)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:634)
    org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:855)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:741)
    org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)


Root Cause
java.lang.ExceptionInInitializerError
    brewery.src.controller.beerService.getAllBeers(beerService.java:26)
    brewery.src.controller.beerController.getBeers(beerController.java:39)
    java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)


Root Cause
javax.persistence.PersistenceException: Exception [EclipseLink-28019] (Eclipse Persistence Services - 2.5.2.v20140319-9ad6abd): org.eclipse.persistence.exceptions.EntityManagerSetupException
Exception Description: Deployment of PersistenceUnit [taste_PU] failed. Close all factories for this PersistenceUnit.
Internal Exception: Exception [EclipseLink-0] (Eclipse Persistence Services - 2.5.2.v20140319-9ad6abd): org.eclipse.persistence.exceptions.IntegrityException
Descriptor Exceptions: 
---------------------------------------------------------

Exception [EclipseLink-93] (Eclipse Persistence Services - 2.5.2.v20140319-9ad6abd): org.eclipse.persistence.exceptions.DescriptorException
Exception Description: The table [categories] is not present in this descriptor.
Descriptor: RelationalDescriptor(brewery.src.model.Beers --> [DatabaseTable(beers)])

Exception [EclipseLink-41] (Eclipse Persistence Services - 2.5.2.v20140319-9ad6abd): org.eclipse.persistence.exceptions.DescriptorException
Exception Description: A non-read-only mapping must be defined for the sequence number field.
Descriptor: RelationalDescriptor(brewery.src.model.Beers --> [DatabaseTable(beers)])

---

如果在

类别中有10个条目，怎么会有更多的啤酒？我觉得你把分类误解为“标准化表”/“啤酒的关联”，这是错误的/不是
SecodaryTable
的意思……而
beers.cat_id
一栏建议：多（啤酒）一（分类）（）…而次表是1对1（对主表）对于SecondaryTable，您将其建模为：
beers:11:styles:11:categories
…但列和问题描述表明：
beers:N1:styles:N1:categories
@xerx593我从未使用多对一注释，这是一种方法，在beer表中创建多对一并将列批注连接到样式表（如您发送的链接中），然后在样式表中创建另一个多对一并将列批注连接到类别表？