MySQLSyntaxErrorException: Unbekannte Spalte 'Kategorie' in 'Feldliste'

Question

Ich habe programmiert, um einen Einkaufswagen für mein Online-Shop-Projekt zu erstellen. Ich habe eine Tabelle namens "Produkte" und eine Entitätsklasse aus dieser Tabelle wie folgt;

package entities; 

import java.io.Serializable; 
import java.util.Date; 
import javax.persistence.Basic; 
import javax.persistence.Column; 
import javax.persistence.Entity; 
import javax.persistence.GeneratedValue; 
import javax.persistence.GenerationType; 
import javax.persistence.Id; 
import javax.persistence.Lob; 
import javax.persistence.NamedQueries; 
import javax.persistence.NamedQuery; 
import javax.persistence.Table; 
import javax.persistence.Temporal; 
import javax.persistence.TemporalType; 
import javax.validation.constraints.NotNull; 
import javax.validation.constraints.Size; 

/** 
* 
* @author fet 
*/ 

@Entity 

@Table(name = "products") 

@NamedQueries({ 

    @NamedQuery(name = "Products.findAll", query = "SELECT p FROM Products p"), 
    @NamedQuery(name = "Products.findByProductId", query = "SELECT p FROM Products p WHERE p.productId = :productId"), 
    @NamedQuery(name = "Products.findByProductName", query = "SELECT p FROM Products p WHERE p.productName = :productName"), 
    @NamedQuery(name = "Products.findBySubCategoryName", query = "SELECT p FROM Products p WHERE p.subCategoryName = :subCategoryName"), 
    @NamedQuery(name = "Products.findByCategoryName", query = "SELECT p FROM Products p WHERE p.categoryName = :categoryName"), 
    @NamedQuery(name = "Products.findByCompanyName", query = "SELECT p FROM Products p WHERE p.companyName = :companyName"), 
    @NamedQuery(name = "Products.findByPrice", query = "SELECT p FROM Products p WHERE p.price = :price"), 
    @NamedQuery(name = "Products.findByTags", query = "SELECT p FROM Products p WHERE p.tags = :tags"), 
    @NamedQuery(name = "Products.findByProductQty", query = "SELECT p FROM Products p WHERE p.productQty = :productQty"), 
    @NamedQuery(name = "Products.findByLastUpdated", query = "SELECT p FROM Products p WHERE p.lastUpdated = :lastUpdated"), 
    @NamedQuery(name = "Products.findByHits", query = "SELECT p FROM Products p WHERE p.hits = :hits")}) 
public class Products implements Serializable { 

    private static final long serialVersionUID = 1L; 
    @Id 
    @GeneratedValue(strategy = GenerationType.IDENTITY) 
    @Basic(optional = false) 
    @Column(name = "product_id") 
    private Integer productId; 
    @Basic(optional = false) 
    @NotNull 
    @Size(min = 1, max = 60) 
    @Column(name = "product-name") 
    private String productName; 
    @Basic(optional = false) 
    @NotNull 
    @Size(min = 1, max = 40) 
    @Column(name = "sub-category-name") 
    private String subCategoryName; 
    @Basic(optional = false) 
    @NotNull 
    @Size(min = 1, max = 40) 
    @Column(name = "category-name") 
    private String categoryName; 
    @Basic(optional = false) 
    @NotNull 
    @Size(min = 1, max = 40) 
    @Column(name = "company-name") 
    private String companyName; 
    @Basic(optional = false) 
    @NotNull 
    @Column(name = "price") 
    private double price; 
    @Lob 
    @Size(max = 65535) 
    @Column(name = "summary") 
    private String summary; 
    @Basic(optional = false) 
    @NotNull 
    @Size(min = 1, max = 255) 
    @Column(name = "tags") 
    private String tags; 
    @Basic(optional = false) 
    @NotNull 
    @Column(name = "product_qty") 
    private int productQty; 
    @Basic(optional = false) 
    @NotNull 
    @Column(name = "lastUpdated") 
    @Temporal(TemporalType.TIMESTAMP) 
    private Date lastUpdated; 
    @Basic(optional = false) 
    @NotNull 
    @Column(name = "hits") 
    private int hits; 

    public Products() { 
    } 

    public Products(Integer productId) { 
     this.productId = productId; 
    } 


    public Products(Integer productId, String productName, String subCategoryName, String categoryName, String companyName, double price, String tags, int productQty, Date lastUpdated, int hits) { 
     this.productId = productId; 
     this.productName = productName; 
     this.subCategoryName = subCategoryName; 
     this.categoryName = categoryName; 
     this.companyName = companyName; 
     this.price = price; 
     this.tags = tags; 
     this.productQty = productQty; 
     this.lastUpdated = lastUpdated; 
     this.hits = hits; 
    } 

    public Integer getProductId() { 
     return productId; 
    } 

    public void setProductId(Integer productId) { 
     this.productId = productId; 
    } 

    public String getProductName() { 
     return productName; 
    } 

    public void setProductName(String productName) { 
     this.productName = productName; 
    } 

    public String getSubCategoryName() { 
     return subCategoryName; 
    } 

    public void setSubCategoryName(String subCategoryName) { 
     this.subCategoryName = subCategoryName; 
    } 

    public String getCategoryName() { 
     return categoryName; 
    } 

    public void setCategoryName(String categoryName) { 
     this.categoryName = categoryName; 
    } 

    public String getCompanyName() { 
     return companyName; 
    } 

    public void setCompanyName(String companyName) { 
     this.companyName = companyName; 
    } 

    public double getPrice() { 
     return price; 
    } 

    public void setPrice(double price) { 
     this.price = price; 
    } 

    public String getSummary() { 
     return summary; 
    } 

    public void setSummary(String summary) { 
     this.summary = summary; 
    } 

    public String getTags() { 
     return tags; 
    } 

    public void setTags(String tags) { 
     this.tags = tags; 
    } 

    public int getProductQty() { 
     return productQty; 
    } 

    public void setProductQty(int productQty) { 
     this.productQty = productQty; 
    } 

    public Date getLastUpdated() { 
     return lastUpdated; 
    } 

    public void setLastUpdated(Date lastUpdated) { 
     this.lastUpdated = lastUpdated; 
    } 

    public int getHits() { 
     return hits; 
    } 

    public void setHits(int hits) { 
     this.hits = hits; 
    } 

    @Override 
    public int hashCode() { 
     int hash = 0; 
     hash += (productId != null ? productId.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 Products)) { 
      return false; 
     } 
     Products other = (Products) object; 
     if ((this.productId == null && other.productId != null) || (this.productId != null && !this.productId.equals(other.productId))) { 
      return false; 
     } 
     return true; 
    } 

    @Override 
    public String toString() { 
     return "entities.Products[ productId=" + productId + " ]"; 
    } 
} 

Um Operationen zu behandeln habe ich eine ejb-Klasse namens "operations" wie folgt;

und ich habe eine XHTML-Datei, die ich meine Produkte präsentieren möchte;

<h:dataTable value="#{index.products}" var="p"> 

     <h:column> 

      <f:facet name="header" /> 
      <h:outputLink value="index.xhtml"/> 
      <f:param name="query" value="#{p.productId}"/> 

     </h:column> 
     . 
     . 
     . 
     . 
     . 
    </h:dataTable> 

Endlich habe ich RequestScoped bean benannter Index;

package WEB; 

import ejb.operations; 
import entities.Products; 
import java.io.Serializable; 
import java.util.List; 
import javax.ejb.EJB; 
import javax.inject.Named; 
import javax.enterprise.context.RequestScoped; 

/** 
* 
* @author fet 
*/ 
@Named(value = "index") 
@RequestScoped 

public class index implements Serializable { 

    @EJB 
    private operations operations; 

    public index() { 
    } 

    public List<Products> getProducts() { 
     return operations.rertrieveProducts(); 

    } 
} 

Aber ich bekomme sofort Fehler, der sagt;

HTTP Status 500 - Internal Server Error 
type Exception report 
messageInternal Server Error 
descriptionThe server encountered an internal error that prevented it from 
fulfilling this request. 
exception 
javax.servlet.ServletException 
root cause 
javax.ejb.EJBException 
root cause 
javax.persistence.PersistenceException: Exception [EclipseLink-4002] (Eclipse Persistence Services - 2.6.1.v20150605-31e8258): 
org.eclipse.persistence.exceptions.DatabaseException 

Internal Exception: 

com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: Unknown column 'category' in 'field list' 

Error Code: 1054 

Call: SELECT product_id, category-name, company-name, hits, lastUpdated, price, product-name, product_qty, sub-category-name, summary, tags FROM products 

Query: ReadAllQuery(referenceClass=Products sql="SELECT product_id, category-name, company-name, hits, lastUpdated, price, product-name, product_qty, sub-category-name, summary, tags FROM products") 

root cause 

Exception [EclipseLink-4002] (Eclipse Persistence Services - 2.6.1.v20150605-31e8258): org.eclipse.persistence.exceptions.DatabaseException 

note Der vollständige Stack-Traces der Ausnahme und ihre Ursachen sind in den Glassfish Server Open Source Edition 4.1.1 Protokolle zur Verfügung.

irgendwelche Meinungen oder Ratschläge? Vielen Dank im Voraus

Answer 1

Es ist, weil Sie Bindestriche (-) in Spaltennamen verwenden. Versuchen Sie, es durch Unterstrich (_) zu ersetzen.
Ich bin mir nicht sicher, ob Sie es wie folgt zu entkommen:

@Column(name = "\`category-name\`") 
private String categoryName;