我如何使用@ManyToMany 在另一个类别中获得价值类别和类别产品 [英] How i get value category and categories product in another class with using @ManyToMany

问题描述

我有 3 节课.

产品类别

package com.eziz.warehouse;导入 com.eziz.clients.Clients;导入 org.springframework.format.annotation.DateTimeFormat;导入 javax.persistence.*;@实体@Table(名称=产品")公共类产品{@Id@GeneratedValue(策略 = GenerationType.IDENTITY)私人长产品ID；@Column(可为空 = 假，长度 = 20)私人字符串产品名称；@ManyToOne@JoinColumn(name = "category_id")私人产品类别产品类别；@Column(可为空 = 假，长度 = 10)私人 int productCount;@DateTimeFormat(pattern = "yyyy-MM-dd")@Column(可为空 = 假)私人字符串 productDateCreated;@Column(可为空 = 假)私人双品采购价格；公共长 getProductId() {返回产品ID；}public void setProductId(Long productId) {this.productId = productId;}公共字符串 getProductName() {返回产品名称；}public void setProductName(String productName) {this.productName = productName;}公共 int getProductCount() {返回产品数量；}public void setProductCount(int productCount) {this.productCount = productCount;}公共字符串 getProductDateCreated() {返回 productDateCreated;}public void setProductDateCreated(String productDateCreated) {this.productDateCreated = productDateCreated;}公共双 getProductPurchasePrice() {返回产品购买价格；}public void setProductPurchasePrice(double productPurchasePrice) {this.productPurchasePrice = productPurchasePrice;}公共产品类别 getProductCategory() {返回产品类别；}public void setProductCategory(ProductCategory productCategory) {this.productCategory = productCategory;}@覆盖公共字符串 toString() {返回 this.productName;}}

ProductCategory 类.

package com.eziz.warehouse;导入 javax.persistence.*;导入 java.util.HashSet;导入 java.util.Set;@实体@Table(name = "productcategory")公共类产品类别{@Id@GeneratedValue(策略 = GenerationType.IDENTITY)私人 Long productCategoryId;@Column(可为空 = 假，长度 = 30)私人字符串产品类别名称；//@ManyToOne//@JoinColumn(name = "productCategory")//私有产品产品；@OneToMany(mappedBy = "productCategory")私人集<产品>产品 = 新 HashSet<>();公共长 getProductCategoryId() {返回 productCategoryId;}public void setProductCategoryId(Long productCategoryId) {this.productCategoryId = productCategoryId;}公共字符串 getProductCategoryName() {返回产品类别名称；}public void setProductCategoryName(String productCategoryName) {this.productCategoryName = productCategoryName;}//公共产品 getProduct() {//返回产品；//}////public void setProduct(Product product) {//this.product = 产品;//}公共集<产品>获取产品(){退货产品；}public void setProducts(Set products) {this.products = 产品；}}

和请求类.

package com.eziz.requestForWarehouse;导入 com.eziz.requests.Requests;导入 com.eziz.user.User;导入 com.eziz.warehouse.Product;导入 com.eziz.warehouse.ProductCategory;导入 org.springframework.format.annotation.DateTimeFormat;导入 javax.persistence.*;导入 java.util.HashSet;导入 java.util.Set;@实体@Table(name = "requestWH")公共类请求仓库{@Id@GeneratedValue(策略 = GenerationType.IDENTITY)私人长请求WHId；@Column(可为空 = 假，长度 = 10)私人 int requestWHCount;@Column(可为空 = 假，长度 = 15)私人字符串请求WHStatus；@DateTimeFormat(pattern = "yyyy-MM-dd")@Column(可为空 = 假)私人字符串 requestWHDateCreated;@DateTimeFormat(pattern = "yyyy-MM-dd")@Column(可为空 = 假)私人字符串请求WHExpiryTime；@ManyToMany@JoinColumn(name = "requestWHProductId")私人集productCategory = new HashSet<>();@ManyToOne@JoinColumn(name = "requestWHRequestId")私人请求请求；公共长 getRequestWHId() {返回请求WHId；}public void setRequestWHId(Long requestWHId) {this.requestWHId = requestWHId;}公共 int getRequestWHCount() {返回请求WHCount；}public void setRequestWHCount(int requestWHCount) {this.requestWHCount = requestWHCount;}公共字符串 getRequestWHStatus() {返回请求WHStatus；}public void setRequestWHStatus(String requestWHStatus) {this.requestWHStatus = requestWHStatus;}公共字符串 getRequestWHDateCreated() {返回请求WHDateCreated;}public void setRequestWHDateCreated(String requestWHDateCreated) {this.requestWHDateCreated = requestWHDateCreated;}公共字符串 getRequestWHExpiryTime() {返回请求WHExpiryTime；}public void setRequestWHExpiryTime(String requestWHExpiryTime) {this.requestWHExpiryTime = requestWHExpiryTime;}//公共产品类别 getProductCategory() {//返回产品类别；//}////public void setProductCategory(ProductCategory productCategory) {//this.productCategory = productCategory;//}公共集获取产品类别(){返回产品类别；}public void setProductCategory(Set productCategory) {this.productCategory = productCategory;}公共请求 getRequests() {退货要求；}公共无效setRequests(请求请求){this.requests = 请求；}}

我需要在请求中使用它，首先选择类别，然后使用选择选项选择类别产品.

html 代码:

 
<p对齐=中心"class=font-aziz">Avadanlıq/Detal Kateqoriya</p><select th:field="*{productCategory}";class="form-control un";id=产品"需要><th:block th:each="pro : ${productCategoryList}"><option th:text="${pro.productCategoryName}";th:value=${pro.productCategoryId}"/></th:block></选择>
<!-- <div class="form-group">--><!-- <p align="center";class=font-aziz">Avadanlıq/Detal</p>--><!-- 
那我怎么解决这个问题?我需要得到产品.但使用类别.我需要在请求中使用它，首先选择类别，然后选择带有选择选项的类别产品.
解决方案
 
<p对齐=中心"class="font-aziz">Avadanlıq/Detal</p><select th:field="*{productCategory}";class="form-control un";id=产品1"需要><span th:each=pro : ${productCategoryList}"><th:block th:each="pro1 : ${pro.products}"><option th:text="${pro1.productName}";th:value=${requestWH.productCategory}"/></th:block></span></选择>
这行得通，但我不明白.
I have 3 class.
Product Class
package com.eziz.warehouse;

import com.eziz.clients.Clients;
import org.springframework.format.annotation.DateTimeFormat;

import javax.persistence.*;

@Entity
@Table(name = "product")
public class Product {

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Long productId;

    @Column(nullable = false, length = 20)
    private String productName;

    @ManyToOne
    @JoinColumn(name = "category_id")
    private ProductCategory productCategory;

    @Column(nullable = false, length = 10)
    private int productCount;

    @DateTimeFormat(pattern = "yyyy-MM-dd")
    @Column(nullable = false)
    private String productDateCreated;

    @Column(nullable = false)
    private double productPurchasePrice;

    public Long getProductId() {
        return productId;
    }

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

    public String getProductName() {
        return productName;
    }

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

    public int getProductCount() {
        return productCount;
    }

    public void setProductCount(int productCount) {
        this.productCount = productCount;
    }

    public String getProductDateCreated() {
        return productDateCreated;
    }

    public void setProductDateCreated(String productDateCreated) {
        this.productDateCreated = productDateCreated;
    }

    public double getProductPurchasePrice() {
        return productPurchasePrice;
    }

    public void setProductPurchasePrice(double productPurchasePrice) {
        this.productPurchasePrice = productPurchasePrice;
    }

    public ProductCategory getProductCategory() {
        return productCategory;
    }

    public void setProductCategory(ProductCategory productCategory) {
        this.productCategory = productCategory;
    }

    @Override
    public String toString() {
        return this.productName;
    }
}
ProductCategory Class.
package com.eziz.warehouse;

import javax.persistence.*;
import java.util.HashSet;
import java.util.Set;

@Entity
@Table(name = "productcategory")
public class ProductCategory {
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Long productCategoryId;


    @Column(nullable = false, length = 30)
    private String productCategoryName;

//    @ManyToOne
//    @JoinColumn(name = "productCategory")
//    private Product product;

    @OneToMany(mappedBy = "productCategory")
    private Set<Product> products = new HashSet<>();

    public Long getProductCategoryId() {
        return productCategoryId;
    }

    public void setProductCategoryId(Long productCategoryId) {
        this.productCategoryId = productCategoryId;
    }

    public String getProductCategoryName() {
        return productCategoryName;
    }

    public void setProductCategoryName(String productCategoryName) {
        this.productCategoryName = productCategoryName;
    }

//    public Product getProduct() {
//        return product;
//    }
//
//    public void setProduct(Product product) {
//        this.product = product;
//    }


    public Set<Product> getProducts() {
        return products;
    }

    public void setProducts(Set<Product> products) {
        this.products = products;
    }
}
and Request Class.
package com.eziz.requestForWarehouse;


import com.eziz.requests.Requests;
import com.eziz.user.User;
import com.eziz.warehouse.Product;
import com.eziz.warehouse.ProductCategory;
import org.springframework.format.annotation.DateTimeFormat;

import javax.persistence.*;
import java.util.HashSet;
import java.util.Set;

@Entity
@Table(name = "requestWH")
public class RequestWarehouse {

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Long requestWHId;

    @Column(nullable = false, length = 10)
    private int requestWHCount;

    @Column(nullable = false, length = 15)
    private String requestWHStatus;

    @DateTimeFormat(pattern = "yyyy-MM-dd")
    @Column(nullable = false)
    private String requestWHDateCreated;

    @DateTimeFormat(pattern = "yyyy-MM-dd")
    @Column(nullable = false)
    private String requestWHExpiryTime;

    @ManyToMany
    @JoinColumn(name = "requestWHProductId")
    private Set<ProductCategory> productCategory = new HashSet<>();

    @ManyToOne
    @JoinColumn(name = "requestWHRequestId")
    private Requests requests;

    public Long getRequestWHId() {
        return requestWHId;
    }

    public void setRequestWHId(Long requestWHId) {
        this.requestWHId = requestWHId;
    }

    public int getRequestWHCount() {
        return requestWHCount;
    }

    public void setRequestWHCount(int requestWHCount) {
        this.requestWHCount = requestWHCount;
    }

    public String getRequestWHStatus() {
        return requestWHStatus;
    }

    public void setRequestWHStatus(String requestWHStatus) {
        this.requestWHStatus = requestWHStatus;
    }

    public String getRequestWHDateCreated() {
        return requestWHDateCreated;
    }

    public void setRequestWHDateCreated(String requestWHDateCreated) {
        this.requestWHDateCreated = requestWHDateCreated;
    }

    public String getRequestWHExpiryTime() {
        return requestWHExpiryTime;
    }

    public void setRequestWHExpiryTime(String requestWHExpiryTime) {
        this.requestWHExpiryTime = requestWHExpiryTime;
    }

//    public ProductCategory getProductCategory() {
//        return productCategory;
//    }
//
//    public void setProductCategory(ProductCategory productCategory) {
//        this.productCategory = productCategory;
//    }


    public Set<ProductCategory> getProductCategory() {
        return productCategory;
    }

    public void setProductCategory(Set<ProductCategory> productCategory) {
        this.productCategory = productCategory;
    }

    public Requests getRequests() {
        return requests;
    }

    public void setRequests(Requests requests) {
        this.requests = requests;
    }
}
I need use this in request, first select category and after categoryproducts with select option.
html code:
          <div class="form-group">
                    <p align="center" class="font-aziz">Avadanlıq / Detal Kateqoriya</p>
                    <select th:field="*{productCategory}" class="form-control un" id="product" required>
                        <th:block th:each="pro : ${productCategoryList}">
                            <option th:text="${pro.productCategoryName}"
                                    th:value="${pro.productCategoryId}"/>
                        </th:block>
                    </select>
                </div>

<!--                <div class="form-group">-->
<!--                    <p align="center" class="font-aziz">Avadanlıq / Detal</p>-->
<!--                    <select th:field="*{productCategory}" class="form-control un" id="product1" required>-->
<!--                        <th:block th:each="pro : ${productCategoryList.products}">-->
<!--                            <option th:text="${pro.productName}"-->
<!--                                    th:value="${productCategory}"/>-->
<!--                        </th:block>-->
<!--                    </select>-->
<!--                </div>-->
and so how i fix this? i am need get products. but using category. I need use this in request, first select category and after categoryproducts with select option.
解决方案
                <div class="form-group">
                    <p align="center" class="font-aziz">Avadanlıq / Detal</p>
                    <select th:field="*{productCategory}" class="form-control un" id="product1" required>
                                          <span th:each="pro : ${productCategoryList}">
                                              <th:block th:each="pro1 : ${pro.products}">
                            <option th:text="${pro1.productName}"
                                    th:value="${requestWH.productCategory}"/>
                        </th:block>
                  </span>
                    </select>
                </div>
this worked, but i dont get all .

                        
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