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  • 内部异常：org.postgresql.util.PSQLException：错误:关系“ProductType_Productitem”不存在

    内部异常：org.postgresql.util.PSQLException：错误:关系“ProductType_Productitem”不存在(内部异常：org.postgresql.util.PSQLException：Error：Relation关系“ProductType_Productitem”不存在)

     1032  IT屋

    在对JAX-RS和JPA进行自我教育的过程中.在Glassfish服务器3.1.2上运行项目时，我偶然发现了以下异常.但是，JPA实施可以作为独立应用程序正常运行.

    内部异常：org.postgresql.util.PSQLException：错误:关系“ProductType_Productitem”不存在位置：65错误代码：0调用：选择T1，“ProductCode”，t1.COST，t1.ITEMCODE，t1.ITEMNAME(来自ProductType_ProductItem 0)，“ProductItem”T1在哪里((t0.ProductType_ProductCode=？)和(T1.“ProductCode”=t0.Item_ProductCode)BIND=>[1个参数绑定]

    我正在使用EclipseKeplerIDE、GlassFishServer3.1.2、泽西(用于JAX-RS)、Eclipselink 2.3(用于JPA实现)和PostgresSQL(用于数据库))。

    CREATE TABLE "ProductType"
(
  "productCode" integer NOT NULL,
  "productName" character(50) NOT NULL,
  "productType" character(50),
  rate numeric(18,6),
  count integer,
  CONSTRAINT "PrimaryKey" PRIMARY KEY ("productCode")
)
WITH (
  OIDS=FALSE
);
ALTER TABLE "ProductType" OWNER TO postgres;
GRANT ALL ON TABLE "ProductType" TO postgres;
GRANT ALL ON TABLE "ProductType" TO public;




 CREATE TABLE "ProductItem"
(
  "productCode" integer NOT NULL,
  "itemCode" character(20),
  "itemName" character(20),
  "cost" numeric(10,6)
)
WITH (
  OIDS=FALSE
);
ALTER TABLE "ProductItem" OWNER TO postgres;
GRANT ALL ON TABLE "ProductItem" TO postgres;
GRANT ALL ON TABLE "ProductItem" TO public;

    实体

    package com.jaxrs.crud;

import java.io.Serializable;
import java.util.ArrayList;
import java.util.List;
import java.util.Random;

import javax.persistence.CascadeType;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.Id;
import javax.persistence.OneToMany;
import javax.persistence.PrimaryKeyJoinColumn;
import javax.persistence.SecondaryTable;
import javax.persistence.Table;
import javax.xml.bind.annotation.XmlElement;
import javax.xml.bind.annotation.XmlElementWrapper;
import javax.xml.bind.annotation.XmlType;

@Entity
@Table(name=""ProductType"")
@XmlType(name = "product")  
public class ProductType implements Serializable {
    /**
     * 
     */
    private static final long serialVersionUID = 1L;
    @Column(name=""productType"")
    private String productType;

    @Column(name=""productName"")
    private String productName;
    @Id
    @Column(name=""productCode"")
    private String productCode;

    private Float rate;
    private int count;
    @OneToMany(cascade=CascadeType.ALL)
    private List<ProductItem> item;

    private ProductType(String productID, String productType,
            String productName,float rate) {
        this.productCode = productID;
        this.productType = productType;
        this.productName = productName;
        this.rate = rate;

        ProductItem item1 = new ProductItem();
        item1.setCost(new Random().nextFloat());
        item1.setItemCode("ITC"+new Random().nextInt());
        item1.setItemName("ITN"+new Random().nextInt());
        if(item == null )
        {
            item = new ArrayList<ProductItem>();
        }
        item.add(item1);

    }
    public ProductType()
    {

    }

    public ProductType(int count) {

        this("PID"+new Random().nextInt(),"PTE"+new Random().nextInt(),"PNE"+new Random().nextInt(),new Random().nextFloat());
        this.count = count;
    }

    /**
     * @return the productType
     */
    @XmlElement(name = "productCode")
    public String getProductType() {
        return productType;
    }

    /**
     * @param productType
     *            the productType to set
     */
    public void setProductType(String productType) {
        this.productType = productType;
    }

    /**
     * @return the productName
     */
    @XmlElement(name = "productName")
    public String getProductName() {
        return productName;
    }

    /**
     * @param productName
     *            the productName to set
     */
    public void setProductName(String productName) {
        this.productName = productName;
    }

    /**
     * @return the productID
     */
    @XmlElement(name = "id")
    public String getProductID() {
        return productCode;
    }

    /**
     * @param productID
     *            the productID to set
     */
    public void setProductID(String productID) {
        this.productCode = productID;
    }

    /**
     * @return the rate
     */
    @XmlElement(name = "rate")
    public Float getRate() {
        return rate;
    }

    /**
     * @param rate
     *            the rate to set
     */
    public void setRate(Float rate) {
        this.rate = rate;
    }

    /**
     * @return the count
     */
    @XmlElement(name = "cnt")
    public int getCount() {
        return count;
    }

    /**
     * @param count
     *            the count to set
     */
    public void setCount(int count) {
        this.count = count;
    }

    /**
     * @return the itemList
     */
    @XmlElement(name = "item")
    @XmlElementWrapper(name = "items") 
    public List<ProductItem> getItemList() {
        return item;
    }

    /**
     * @param itemList
     *            the itemList to set
     */
    public void setItemList(List<ProductItem> itemList) {
        this.item = itemList;
    }

      @Override
        public String toString() {
            return new StringBuilder().append(this.productCode).append("  ").append(this.productName).append("  ").append(this.productType).append("  ").append(this.rate).append("  ").append(this.count).toString();

    }
}

    ProductItem实体

    package com.jaxrs.crud;

import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.Id;
import javax.persistence.Table;
import javax.xml.bind.annotation.XmlAccessType;
import javax.xml.bind.annotation.XmlAccessorType;
import javax.xml.bind.annotation.XmlType;

@Entity
@Table(name=""ProductItem"")
@XmlType(propOrder = { "productCode","itemCode", "itemName", "cost" } )  
@XmlAccessorType(XmlAccessType.FIELD)  
public class ProductItem {
    @Id
    @Column(name=""productCode"")
    private String productCode;
    private String itemCode;
    private String itemName;
    private Float cost;

    /**
     * @return the itemCode
     */
    public String getItemCode() {
        return itemCode;
    }

    /**
     * @param itemCode
     *            the itemCode to set
     */
    public void setItemCode(String itemCode) {
        this.itemCode = itemCode;
    }

    /**
     * @return the itemName
     */
    public String getItemName() {
        return itemName;
    }

    /**
     * @param itemName
     *            the itemName to set
     */
    public void setItemName(String itemName) {
        this.itemName = itemName;
    }

    /**
     * @return the cost
     */
    public Float getCost() {
        return cost;
    }

    /**
     * @param cost
     *            the cost to set
     */
    public void setCost(Float cost) {
        this.cost = cost;
    }

    /**
     * @return the productCode
     */
    public String getProductCode() {
        return productCode;
    }

    /**
     * @param productCode the productCode to set
     */
    public void setProductCode(String productCode) {
        this.productCode = productCode;
    }



}

    JPA调用

    EntityManagerFactory entityManagerFactory = Persistence
            .createEntityManagerFactory("jaxrs");
    EntityManager em = entityManagerFactory
            .createEntityManager();

    List<ProductType> results = null;
    try {
        Query query = em.createQuery("SELECT p FROM ProductType p",
                ProductType.class);
        results = query.getResultList();
        for (ProductType pt : results)
            System.out.println(pt);
    } catch (Exception e) {
        e.printStackTrace();
    } finally {
        em.close();
        entityManagerFactory.close();
    }

    return results;
    解决方案

    我通过更改ProductType类来解决此问题

    @OneToMany(cascade=CascadeType.ALL)
    private List<ProductItem> item;

    到

    @OneToMany(orphanRemoval = true)
    @JoinColumn(name = ""productCode"")
    private List<ProductItem> item;

    通过这种方式，我理解应该以单向关系使用JoinColumn来指定持久性提供程序的ForeignKey(此处ProductCode在ProductItem中为FK)

    但是当我单独运行它时，前者仍然可以工作

    EntityManagerFactory entityManagerFactory = Persistence
            .createEntityManagerFactory("jaxrs");
    EntityManager em = entityManagerFactory
            .createEntityManager();

    List<ProductType> results = null;
    try {
        Query query = em.createQuery("SELECT p FROM ProductType p",
                ProductType.class);
        results = query.getResultList();
        for (ProductType pt : results)
            System.out.println(pt);
    } catch (Exception e) {
        e.printStackTrace();
    } finally {
        em.close();
        entityManagerFactory.close();
    }

    return results;

    尝试对此进行分析.如果我找到任何东西，将发布.

    谢谢.

    在对自己进行JAX-RS和JPA教育的过程中。在Glassfish服务器3.1.2上运行该项目时，我偶然发现了以下异常。但是，JPA实现作为一个独立的应用程序运行得很好。

    内部异常：org.postgresql.util.PSQLException：错误：关系“ProductType_Productitem”不存在位置：65错误代码：0调用：选择T1。“产品代码”，t1.COST，t1.ITEMCODE，t1.ITEMNAME从ProductType_ProductItem 0，“ProductItem”T1((t0.ProductType_ProductCode=？)和(T1.“ProductCode”=t0.Item_ProductCode)BIND=>[1参数绑定]

    我使用EclipseKeplerIDE、GlassFish Server 3.1.2、泽西用于JAX-RS、Eclipselink 2.3用于JPA实现，PostgresSQL用于数据库。

    CREATE TABLE "ProductType"
(
  "productCode" integer NOT NULL,
  "productName" character(50) NOT NULL,
  "productType" character(50),
  rate numeric(18,6),
  count integer,
  CONSTRAINT "PrimaryKey" PRIMARY KEY ("productCode")
)
WITH (
  OIDS=FALSE
);
ALTER TABLE "ProductType" OWNER TO postgres;
GRANT ALL ON TABLE "ProductType" TO postgres;
GRANT ALL ON TABLE "ProductType" TO public;




 CREATE TABLE "ProductItem"
(
  "productCode" integer NOT NULL,
  "itemCode" character(20),
  "itemName" character(20),
  "cost" numeric(10,6)
)
WITH (
  OIDS=FALSE
);
ALTER TABLE "ProductItem" OWNER TO postgres;
GRANT ALL ON TABLE "ProductItem" TO postgres;
GRANT ALL ON TABLE "ProductItem" TO public;

    实体

    package com.jaxrs.crud;

import java.io.Serializable;
import java.util.ArrayList;
import java.util.List;
import java.util.Random;

import javax.persistence.CascadeType;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.Id;
import javax.persistence.OneToMany;
import javax.persistence.PrimaryKeyJoinColumn;
import javax.persistence.SecondaryTable;
import javax.persistence.Table;
import javax.xml.bind.annotation.XmlElement;
import javax.xml.bind.annotation.XmlElementWrapper;
import javax.xml.bind.annotation.XmlType;

@Entity
@Table(name=""ProductType"")
@XmlType(name = "product")  
public class ProductType implements Serializable {
    /**
     * 
     */
    private static final long serialVersionUID = 1L;
    @Column(name=""productType"")
    private String productType;

    @Column(name=""productName"")
    private String productName;
    @Id
    @Column(name=""productCode"")
    private String productCode;

    private Float rate;
    private int count;
    @OneToMany(cascade=CascadeType.ALL)
    private List<ProductItem> item;

    private ProductType(String productID, String productType,
            String productName,float rate) {
        this.productCode = productID;
        this.productType = productType;
        this.productName = productName;
        this.rate = rate;

        ProductItem item1 = new ProductItem();
        item1.setCost(new Random().nextFloat());
        item1.setItemCode("ITC"+new Random().nextInt());
        item1.setItemName("ITN"+new Random().nextInt());
        if(item == null )
        {
            item = new ArrayList<ProductItem>();
        }
        item.add(item1);

    }
    public ProductType()
    {

    }

    public ProductType(int count) {

        this("PID"+new Random().nextInt(),"PTE"+new Random().nextInt(),"PNE"+new Random().nextInt(),new Random().nextFloat());
        this.count = count;
    }

    /**
     * @return the productType
     */
    @XmlElement(name = "productCode")
    public String getProductType() {
        return productType;
    }

    /**
     * @param productType
     *            the productType to set
     */
    public void setProductType(String productType) {
        this.productType = productType;
    }

    /**
     * @return the productName
     */
    @XmlElement(name = "productName")
    public String getProductName() {
        return productName;
    }

    /**
     * @param productName
     *            the productName to set
     */
    public void setProductName(String productName) {
        this.productName = productName;
    }

    /**
     * @return the productID
     */
    @XmlElement(name = "id")
    public String getProductID() {
        return productCode;
    }

    /**
     * @param productID
     *            the productID to set
     */
    public void setProductID(String productID) {
        this.productCode = productID;
    }

    /**
     * @return the rate
     */
    @XmlElement(name = "rate")
    public Float getRate() {
        return rate;
    }

    /**
     * @param rate
     *            the rate to set
     */
    public void setRate(Float rate) {
        this.rate = rate;
    }

    /**
     * @return the count
     */
    @XmlElement(name = "cnt")
    public int getCount() {
        return count;
    }

    /**
     * @param count
     *            the count to set
     */
    public void setCount(int count) {
        this.count = count;
    }

    /**
     * @return the itemList
     */
    @XmlElement(name = "item")
    @XmlElementWrapper(name = "items") 
    public List<ProductItem> getItemList() {
        return item;
    }

    /**
     * @param itemList
     *            the itemList to set
     */
    public void setItemList(List<ProductItem> itemList) {
        this.item = itemList;
    }

      @Override
        public String toString() {
            return new StringBuilder().append(this.productCode).append("  ").append(this.productName).append("  ").append(this.productType).append("  ").append(this.rate).append("  ").append(this.count).toString();

    }
}

    产品实体

    package com.jaxrs.crud;

import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.Id;
import javax.persistence.Table;
import javax.xml.bind.annotation.XmlAccessType;
import javax.xml.bind.annotation.XmlAccessorType;
import javax.xml.bind.annotation.XmlType;

@Entity
@Table(name=""ProductItem"")
@XmlType(propOrder = { "productCode","itemCode", "itemName", "cost" } )  
@XmlAccessorType(XmlAccessType.FIELD)  
public class ProductItem {
    @Id
    @Column(name=""productCode"")
    private String productCode;
    private String itemCode;
    private String itemName;
    private Float cost;

    /**
     * @return the itemCode
     */
    public String getItemCode() {
        return itemCode;
    }

    /**
     * @param itemCode
     *            the itemCode to set
     */
    public void setItemCode(String itemCode) {
        this.itemCode = itemCode;
    }

    /**
     * @return the itemName
     */
    public String getItemName() {
        return itemName;
    }

    /**
     * @param itemName
     *            the itemName to set
     */
    public void setItemName(String itemName) {
        this.itemName = itemName;
    }

    /**
     * @return the cost
     */
    public Float getCost() {
        return cost;
    }

    /**
     * @param cost
     *            the cost to set
     */
    public void setCost(Float cost) {
        this.cost = cost;
    }

    /**
     * @return the productCode
     */
    public String getProductCode() {
        return productCode;
    }

    /**
     * @param productCode the productCode to set
     */
    public void setProductCode(String productCode) {
        this.productCode = productCode;
    }



}

    JPA调用

    EntityManagerFactory entityManagerFactory = Persistence
            .createEntityManagerFactory("jaxrs");
    EntityManager em = entityManagerFactory
            .createEntityManager();

    List<ProductType> results = null;
    try {
        Query query = em.createQuery("SELECT p FROM ProductType p",
                ProductType.class);
        results = query.getResultList();
        for (ProductType pt : results)
            System.out.println(pt);
    } catch (Exception e) {
        e.printStackTrace();
    } finally {
        em.close();
        entityManagerFactory.close();
    }

    return results;
    解决方案

    我通过更改ProductType类来修正这个问题

    @OneToMany(cascade=CascadeType.ALL)
    private List<ProductItem> item;

    到

    @OneToMany(orphanRemoval = true)
    @JoinColumn(name = ""productCode"")
    private List<ProductItem> item;

    通过这个，我了解到应该在单向关系中使用JoinColumn来指定持久化提供者ForeignKey(在这里，ProductCode是ProductItem中的FK)

    但是，当我把它作为独立的运行时，前者仍然有效。

    EntityManagerFactory entityManagerFactory = Persistence
            .createEntityManagerFactory("jaxrs");
    EntityManager em = entityManagerFactory
            .createEntityManager();

    List<ProductType> results = null;
    try {
        Query query = em.createQuery("SELECT p FROM ProductType p",
                ProductType.class);
        results = query.getResultList();
        for (ProductType pt : results)
            System.out.println(pt);
    } catch (Exception e) {
        e.printStackTrace();
    } finally {
        em.close();
        entityManagerFactory.close();
    }

    return results;

    试着分析这个。如果我发现什么。

    为人：谦逊、激情、博学、审问、慎思、明辨、 笃行
    学问：纸上得来终觉浅，绝知此事要躬行
    为事：工欲善其事，必先利其器。
    态度：道阻且长，行则将至；行而不辍，未来可期
    转载请标注出处！
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  • 原文地址：https://www.cnblogs.com/ios9/p/15497582.html
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