Java 在Spring Mvc 3Hibernate中未执行保存

文章

类别：

package net.devmanuals.model;
import java.util.Date;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import javax.persistence.Table;
import javax.persistence.Temporal;

    @Entity
    @Table(name = "imei")
    public class Article {
    @Id
        @Column(name = "imei1",nullable = false)
    private Long imeiNo;
        @Column(name = "date_added")
    @Temporal(javax.persistence.TemporalType.DATE)
    private Date addedDate;

    public Article() {      
    }

        public Long getimei1() {
        return imeiNo;
    }

    public void setimei1(Long imei1) {
        this.imeiNo = imeiNo;
    }

        public Date getAddedDate() {
        return addedDate;
    }

    public void setAddedDate(Date addedDate) {
        this.addedDate = addedDate;
    }   
}

package net.devmanuals.controller;

import java.util.HashMap;
import java.util.Map;

import net.devmanuals.model.Article;
import net.devmanuals.service.ArticleService;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.validation.BindingResult;
import org.springframework.web.bind.annotation.ModelAttribute;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.servlet.ModelAndView;

@Controller
@RequestMapping("/articles")
public class ArticleController {

    @Autowired
    private ArticleService articleService;

    @RequestMapping(value = "/save", method = RequestMethod.POST)
    public ModelAndView saveArticle(@ModelAttribute(" article") Article  article,
            BindingResult result) {
         articleService.addArticle( article);
        return new ModelAndView("redirect:/articles.html");
    }

    @RequestMapping(method = RequestMethod.GET)
    public ModelAndView listArticles() {

    Map<String, Object> model = new HashMap<String, Object>();
        model.put("articles",  articleService.listArticles());

        return new ModelAndView("articlesList", model);
    }

    @RequestMapping(value = "/add", method = RequestMethod.GET)
    public ModelAndView addArticle(@ModelAttribute("article") Article article,
            BindingResult result) {
        return new ModelAndView("addArticle");
    }

}

ArticleController

class:

package net.devmanuals.model;
import java.util.Date;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import javax.persistence.Table;
import javax.persistence.Temporal;

    @Entity
    @Table(name = "imei")
    public class Article {
    @Id
        @Column(name = "imei1",nullable = false)
    private Long imeiNo;
        @Column(name = "date_added")
    @Temporal(javax.persistence.TemporalType.DATE)
    private Date addedDate;

    public Article() {      
    }

        public Long getimei1() {
        return imeiNo;
    }

    public void setimei1(Long imei1) {
        this.imeiNo = imeiNo;
    }

        public Date getAddedDate() {
        return addedDate;
    }

    public void setAddedDate(Date addedDate) {
        this.addedDate = addedDate;
    }   
}

package net.devmanuals.controller;

import java.util.HashMap;
import java.util.Map;

import net.devmanuals.model.Article;
import net.devmanuals.service.ArticleService;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.validation.BindingResult;
import org.springframework.web.bind.annotation.ModelAttribute;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.servlet.ModelAndView;

@Controller
@RequestMapping("/articles")
public class ArticleController {

    @Autowired
    private ArticleService articleService;

    @RequestMapping(value = "/save", method = RequestMethod.POST)
    public ModelAndView saveArticle(@ModelAttribute(" article") Article  article,
            BindingResult result) {
         articleService.addArticle( article);
        return new ModelAndView("redirect:/articles.html");
    }

    @RequestMapping(method = RequestMethod.GET)
    public ModelAndView listArticles() {

    Map<String, Object> model = new HashMap<String, Object>();
        model.put("articles",  articleService.listArticles());

        return new ModelAndView("articlesList", model);
    }

    @RequestMapping(value = "/add", method = RequestMethod.GET)
    public ModelAndView addArticle(@ModelAttribute("article") Article article,
            BindingResult result) {
        return new ModelAndView("addArticle");
    }

}

保存数据时出现此错误（但显示数据时无错误）：

---

例外说明了一切。在持久化实体之前，必须为其分配ID。因此，在调用

persist（）

之前，只需调用一个设置

imeiNo

值的方法。不幸的是，你没有这样的方法。唯一一个看起来像这样的设置器的是以下设置器：

public void setimei1(Long imei1) {
    this.imeiNo = imeiNo;
}

但是，它不仅名称不正确（应该称为

setImeiNo

），而且它还有一个明显的缺陷：它完全忽略其参数，并将

imeiNo

的值设置为它已经拥有的值

考虑到你的能手和二传手都一团糟，我的建议是：

• 把它们全部去掉
• 使用IDE自动重新生成它们

设定者应为：

public void setImeiNo(Long imeiNo) {
    this.imeiNo = imeiNo;
}

---

为您设置一个自动递增的it模型，您不应该看到错误，也不需要自己添加id

@Id
@GeneratedValue(strategy=GenerationType.AUTO)
private int id;

---

代码太多，请发布。您需要一个Id生成方案。Dup：先生，我已经添加了@GeneratedValue，但知道还有其他错误。先生，实际上我想插入imei（即id手动而非自动生成）@MrD，我认为这会解决我的问题，因此我发布了3个类请帮助我手动输入id并保存数据好的，谢谢，我也会尝试这样做，你们都告诉过了，然后回复你们，，谢谢感谢所有人，实际上这是我的错误，，您是对的，先生@JB Nizet。我的错误是public void setimei1（Long imei1）{this.imeiNo=imeiNo；}，但是先生，我想在显示日期时也显示时间。在我的数据库中显示日期和时间，但不在浏览器中显示，请告诉我如何获得时间？如果您想获得日期和时间，您不认为TemporalType.TIMESTAMP比TemporalType.Date更合适吗？先生，您能告诉我如何一次在两个数据库中输入值吗？？因为我必须在一个表中输入imei编号，在第二个表中输入imei以及日期和时间。我已经执行了第二个表的工作，但我不知道如何在两个表中同时输入值。如果您想访问@MatthiasLaug，请提供帮助，但实际上我需要手动添加id（即imei no）。还是谢谢