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Spring Angular CRUD应用程序

spring angular crud应用程序

 

在本节中，我们将开发一个crud(创建-读取-更新-删除)web应用程序。该应用程序包含学生表单，该表单包含crud功能，例如添加，查看，删除和更新学生。在这种集成中，我们使用spring boot处理后端部分，使用angular处理前端部分。

 

工作应用程序

  • 一旦我们将应用程序部署到服务器上，就会在web浏览器中生成学生表格。
  • 该表单有助于添加和查看学生。
  • 点击添加学生链接后，页面会重定向到创建学生表格，我们可以通过填写所需的详细信息并提交来添加学生。
  • 使用查看学生链接，我们可以获取现有学生的详细信息。在这里，每个学生还包含更新和删除链接。
  • 因此，我们可以更新学生的详细信息，也可以从数据库中删除他们。
  • 完成后，在网络浏览器中提供url http://localhost: 4200/。

 

要使用的工具

  • 使用任何ide来开发spring和hibernate项目。可能是sts/eclipse/netbeans。在这里，我们正在使用sts(spring工具套件)。
  • 用于数据库的mysql。
  • 使用任何ide来开发angular项目。它可能是visual studio代码/sublime。在这里，我们正在使用visual studio code。
  • 服务器: apache tomcat/jboss/glassfish/weblogic/websphere。

我们使用的技术

在这里，我们正在使用以下技术:

  • springboot2
  • hibernate5
  • angular6
  • mysql

创建数据库

让我们创建数据库 indigo 。无需创建表，因为hibernate会自动创建它。

 

spring模块

让我们看看我们需要遵循的spring boot的目录结构:

angular + spring crud示例

要开发crud应用程序，请执行以下步骤: -

 

  • 将依赖项添加到pom.xml文件。

 

<?xml version="1.0" encoding="utf-8"?>
<project xmlns="http://maven.apache.org/pom/4.0.0" xmlns:xsi="http://www.w3.org/2001/xmlschema-instance"
	xsi:schemalocation="http://maven.apache.org/pom/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
	<modelversion>4.0.0</modelversion>
	<parent>
		<groupid>org.springframework.boot</groupid>
		<artifactid>spring-boot-starter-parent</artifactid>
		<version>2.1.4.release</version>
		<relativepath/> <!-- lookup parent from repository -->
	</parent>
	<groupid>com.main</groupid>
	<artifactid>student</artifactid>
	<version>0.0.1-snapshot</version>
	<name>student</name>
	<description>demo project for spring boot</description>
	<properties>
		<java.version>1.8</java.version>
	</properties>
	<dependencies>
	
		<dependency>
		    <groupid>org.springframework.boot</groupid>
		    <artifactid>spring-boot-devtools</artifactid>
            <optional>true</optional>
		</dependency>
	
		<dependency>
			<groupid>org.springframework.boot</groupid>
			<artifactid>spring-boot-starter-data-jpa</artifactid>
		</dependency>
		<dependency>
			<groupid>org.springframework.boot</groupid>
			<artifactid>spring-boot-starter-web</artifactid>
		</dependency>
		<dependency>
			<groupid>mysql</groupid>
			<artifactid>mysql-connector-java</artifactid>
			<scope>runtime</scope>
		</dependency>
		<dependency>
			<groupid>org.springframework.boot</groupid>
			<artifactid>spring-boot-starter-test</artifactid>
			<scope>test</scope>
		</dependency>
	</dependencies>
	<build>
		<plugins>
			<plugin>
				<groupid>org.springframework.boot</groupid>
				<artifactid>spring-boot-maven-plugin</artifactid>
			</plugin>
		</plugins>
	</build>
</project>

 

  • 创建配置类
    我们执行基于注释的配置，而不是xml。因此，我们创建一个类config.java并在其中指定所需的配置。但是，还有一个配置类studentapplication.java。此类由spring boot自动提供。q

 

config.java 

package config;
import java.util.properties;
import javax.sql.datasource;
import org.springframework.beans.factory.annotation.value;
import org.springframework.boot.autoconfigure.enableautoconfiguration;
import org.springframework.boot.autoconfigure.orm.jpa.hibernatejpaautoconfiguration;
import org.springframework.context.annotation.bean;
import org.springframework.context.annotation.componentscan;
import org.springframework.context.annotation.componentscans;
import org.springframework.context.annotation.configuration;
import org.springframework.jdbc.datasource.drivermanagerdatasource;
import org.springframework.orm.hibernate5.hibernatetransactionmanager;
import org.springframework.orm.hibernate5.localsessionfactorybean;
import org.springframework.transaction.annotation.enabletransactionmanagement;
import org.springframework.web.servlet.view.internalresourceviewresolver;
@configuration
@enabletransactionmanagement
@enableautoconfiguration(exclude = { hibernatejpaautoconfiguration.class})
@componentscans(value = { @componentscan("boot.entry"),
	      @componentscan("model"),
	      @componentscan("controller"),
	      @componentscan("dao"),
	      @componentscan("miscallaneous"),
	      @componentscan("service")})
public class config {
	 @value("${db.driver}")
	    private string db_driver;
	    @value("${db.password}")
	    private string db_password;
	    @value("${db.url}")
	    private string db_url;
	    @value("${db.username}")
	    private string db_username;
	    @value("${hibernate.dialect}")
	    private string hibernate_dialect;
	    @value("${hibernate.show_sql}")
	    private string hibernate_show_sql;
	    @value("${hibernate.hbm2ddl.auto}")
	    private string hibernate_hbm2ddl_auto;
	    @value("${entitymanager.packagestoscan}")
	    private string entitymanager_packages_to_scan;
	    @bean
	    public localsessionfactorybean sessionfactory() {
	        localsessionfactorybean sessionfactory = new localsessionfactorybean();
	        sessionfactory.setdatasource(datasource());
	        sessionfactory.setpackagestoscan(entitymanager_packages_to_scan);
	        properties hibernateproperties = new properties();
	        hibernateproperties.put("hibernate.dialect", hibernate_dialect);
	        hibernateproperties.put("hibernate.show_sql", hibernate_show_sql);
	        hibernateproperties.put("hibernate.hbm2ddl.auto", hibernate_hbm2ddl_auto);
	        sessionfactory.sethibernateproperties(hibernateproperties);
	        return sessionfactory;
	    }
	    @bean
	    public datasource datasource() {
	        drivermanagerdatasource datasource = new drivermanagerdatasource();
	        datasource.setdriverclassname(db_driver);
	        datasource.seturl(db_url);
	        datasource.setusername(db_username);
	        datasource.setpassword(db_password);
	        return datasource;
	    }
	    @bean
	    public hibernatetransactionmanager transactionmanager() {
	        hibernatetransactionmanager txmanager = new hibernatetransactionmanager();
	        txmanager.setsessionfactory(sessionfactory().getobject());
	        return txmanager;
	    }
	    
	    @bean
	    public internalresourceviewresolver jspviewresolver() {
	        internalresourceviewresolver resolver= new internalresourceviewresolver();
	        resolver.setprefix("/views/");
	        resolver.setsuffix(".jsp");
	        return resolver;
	    } 
	   
	   
	   
	}

studentapplication.java 

package config;
import org.springframework.boot.springapplication;
import org.springframework.boot.autoconfigure.springbootapplication;
@springbootapplication
public class studentapplication {
	public static void main(string[] args) {
		springapplication.run(studentapplication.class, args);
	}
}

 

  • 创建实体类
    在这里，我们将创建一个entity/pojo(普通的旧java对象)类。

 

student.java 

package model;
import javax.persistence.entity;
import javax.persistence.generatedvalue;
import javax.persistence.generationtype;
import javax.persistence.id;
import javax.persistence.table;
@entity
@table(name="student")
public class student {
	@id
	@generatedvalue(strategy=generationtype.identity)
	private int student_id;
	private string student_name;
	private string student_email;
	private string student_branch;
	public int getstudent_id() {
		return student_id;
	}
	public void setstudent_id(int student_id) {
		this.student_id = student_id;
	}
	public string getstudent_name() {
		return student_name;
	}
	public void setstudent_name(string student_name) {
		this.student_name = student_name;
	}
	public string getstudent_email() {
		return student_email;
	}
	public void setstudent_email(string student_email) {
		this.student_email = student_email;
	}
	public string getstudent_branch() {
		return student_branch;
	}
	public void setstudent_branch(string student_branch) {
		this.student_branch = student_branch;
	}
	
}

 

  • 创建dao界面
    在这里，我们正在创建dao界面以执行与数据库相关的操作。

 

student_dao.java 

package dao;
import java.util.list;
import model.student;
public interface student_dao {
	public boolean savestudent(student student);
	public list<student> getstudents();
	public boolean deletestudent(student student);
	public list<student> getstudentbyid(student student);
	public boolean updatestudent(student student);
}

 

  • 创建dao接口实现类

 

student_dao_imp.java 

package dao;
import java.util.list;
import org.hibernate.session;
import org.hibernate.sessionfactory;
import org.hibernate.query.query;
import org.springframework.beans.factory.annotation.autowired;
import org.springframework.stereotype.repository;
import model.student;
@repository
public class student_dao_imp  implements student_dao{
	@autowired
	private sessionfactory sessionfactory;
	
	@override
	public boolean savestudent(student student) {
		boolean status=false;
		try {
			sessionfactory.getcurrentsession().save(student);
			status=true;
		} catch (exception e) {
			e.printstacktrace();
		}
		return status;
	}
	@override
	public list<student> getstudents() {
		session currentsession = sessionfactory.getcurrentsession();
		query<student> query=currentsession.createquery("from student", student.class);
		list<student> list=query.getresultlist();
		return list;
	}
	@override
	public boolean deletestudent(student student) {
		boolean status=false;
		try {
			sessionfactory.getcurrentsession().delete(student);
			status=true;
		} catch (exception e) {
			e.printstacktrace();
		}
		return status;
	}
	@override
	public list<student> getstudentbyid(student student) {
		session currentsession = sessionfactory.getcurrentsession();
		query<student> query=currentsession.createquery("from student where student_id=:student_id", student.class);
		query.setparameter("student_id", student.getstudent_id());
		list<student> list=query.getresultlist();
		return list;
	}
	@override
	public boolean updatestudent(student student) {
		boolean status=false;
		try {
			sessionfactory.getcurrentsession().update(student);
			status=true;
		} catch (exception e) {
			e.printstacktrace();
		}
		return status;
	}
	
	
}

 

  • 创建服务层接口

 

在这里，我们正在创建一个服务层接口，充当dao和实体类之间的桥梁。

student_service.java 

package service;
import java.util.list;
import model.student;
public interface student_service {
	
	public boolean savestudent(student student);
	public list<student> getstudents();
	public boolean deletestudent(student student);
	public list<student> getstudentbyid(student student);
	public boolean updatestudent(student student);
}

 

  • 创建服务层实现类

 

student_service_imp.java 

package service;
import java.util.list;
import org.springframework.beans.factory.annotation.autowired;
import org.springframework.stereotype.service;
import org.springframework.transaction.annotation.transactional;
import dao.student_dao;
import model.student;
@service
@transactional
public class student_service_imp implements student_service {
 
	@autowired
	private student_dao studentdao;
	
	@override
	public boolean savestudent(student student) {
		return studentdao.savestudent(student);
	}
	@override
	public list<student> getstudents() {
		return studentdao.getstudents();
	}
	@override
	public boolean deletestudent(student student) {
		return studentdao.deletestudent(student);
	}
	@override
	public list<student> getstudentbyid(student student) {
		return studentdao.getstudentbyid(student);
	}
	@override
	public boolean updatestudent(student student) {
		return studentdao.updatestudent(student);
	}
}

 

  • 创建控制器类

 

controller.java 

package controller;
import java.util.list;
import org.springframework.beans.factory.annotation.autowired;
import org.springframework.web.bind.annotation.crossorigin;
import org.springframework.web.bind.annotation.deletemapping;
import org.springframework.web.bind.annotation.getmapping;
import org.springframework.web.bind.annotation.pathvariable;
import org.springframework.web.bind.annotation.postmapping;
import org.springframework.web.bind.annotation.requestbody;
import org.springframework.web.bind.annotation.requestmapping;
import org.springframework.web.bind.annotation.restcontroller;
import model.student;
import service.student_service;
@restcontroller
@crossorigin(origins="http://localhost:4200")
@requestmapping(value="/api")
public class controller {
	
	@autowired
	private student_service studentservice;
	
	@postmapping("save-student")
	public boolean savestudent(@requestbody student student) {
		 return studentservice.savestudent(student);
		
	}
	
	@getmapping("students-list")
	public list<student> allstudents() {
		 return studentservice.getstudents();
		
	}
	
	@deletemapping("delete-student/{student_id}")
	public boolean deletestudent(@pathvariable("student_id") int student_id,student student) {
		student.setstudent_id(student_id);
		return studentservice.deletestudent(student);
	}
	@getmapping("student/{student_id}")
	public list<student> allstudentbyid(@pathvariable("student_id") int student_id,student student) {
		 student.setstudent_id(student_id);
		 return studentservice.getstudentbyid(student);
		
	}
	
	@postmapping("update-student/{student_id}")
	public boolean updatestudent(@requestbody student student,@pathvariable("student_id") int student_id) {
		student.setstudent_id(student_id);
		return studentservice.updatestudent(student);
	}
}

 

  • 编辑application.properties文件
    在这里，我们正在编辑 src/main/resources 文件夹中的 application.properties 文件。以下文件包含配置属性。

 

application.properties 

# database
db.driver= com.mysql.jdbc.driver
db.url= jdbc:mysql://localhost:3306/indigo
db.username=root
db.password=
# hibernate
hibernate.dialect=org.hibernate.dialect.mysql5dialect
hibernate.show_sql=true
hibernate.hbm2ddl.auto=update
entitymanager.packagestoscan=model

 

angular模块

让我们看看angular的目录结构:

spring angular crud应用程序

  • 创建一个angular项目

 

使用以下命令创建一个angular项目:

ng新的angular

spring angular crud application
spring angular crud application

此处， angular 是项目的名称。

 

安装bootstrap css框架

使用以下命令

npm install bootstrap@3.3.7 --save

现在，在style.css中包含以下代码文件。

@import "~bootstrap/dist/css/bootstrap.css";

 

安装angular-datatable

使用以下命令在项目中安装angular数据表。

npm install angular-datatable --save

spring angular crud应用程序

必须包含 app.module.ts 文件的导入数组中的datatablemodule 。

 

  • 生成组件
    在visual studio中打开项目，然后使用以下命令生成angular组件:
    ng gc addstudent
    ng gc studentlist

spring angular crud应用程序

 

我们还使用以下命令创建服务类: -

ng gs学生

spring angular crud应用程序

  • 编辑 app.module.ts 文件 导入路由-在这里，我们正在导入路由文件(app-routing.module.ts)，并将其包含在imports数组中。
  • 导入reactiveformsmodule -在这里，我们将导入 reactiveformsmodule 用于反应形式，并在imports数组中指定它。
  • 导入httpmodule -在这里，我们为服务器请求导入 httpmodule ，并在import数组中指定它。
  • 注册服务类-在这里，我们提到了提供者数组中的服务类。

 

import { browsermodule } from '@angular/platform-browser';
import { ngmodule } from '@angular/core';
import { approutingmodule } from './app-routing.module';
import { appcomponent } from './app.component';
import { formsmodule, reactiveformsmodule } from '@angular/forms';
import { httpclientmodule } from '@angular/common/http';
import {datatablesmodule} from 'angular-datatables';
import { studentlistcomponent } from './student-list/student-list.component';
import { addstudentcomponent } from './add-student/add-student.component';
@ngmodule({
  declarations: [
    appcomponent,
    studentlistcomponent,
    addstudentcomponent,
  ],
  imports: [
    browsermodule,
    approutingmodule,
    formsmodule,
    reactiveformsmodule,
    httpclientmodule,
    datatablesmodule
  ],
  providers: [],
  bootstrap: [appcomponent]
})
export class appmodule { }

 

  • 编辑 app-routing.module.ts 文件

 

import { ngmodule } from '@angular/core';
import { routes, routermodule } from '@angular/router';
import { studentlistcomponent } from './student-list/student-list.component';
import { addstudentcomponent } from './add-student/add-student.component';
const routes: routes = [
  { path: '', redirectto: 'view-student', pathmatch: 'full' },
  { path: 'view-student', component: studentlistcomponent },
  { path: 'add-student', component: addstudentcomponent },
];
@ngmodule({
  imports: [routermodule.forroot(routes)],
  exports: [routermodule]
})
export class approutingmodule { }

 

  • 编辑 app.component.html 文件

 

    <div  class="container-fluid">
    <nav class="navbar navbar-expand-sm bg-dark navbar-dark">
        <ul class="navbar-nav">
          <li class="nav-item ">
            <a routerlink="view-student" class="nav-link" class="btn btn-primary active" role="button" >view student</a>
          </li> 
          <li class="nav-item">
            <a  routerlink="add-student" class="nav-link" class="btn btn-primary active" role="button" >add student</a>
          </li>          
        </ul>
      </nav>   
        <router-outlet></router-outlet>
    </div>

 

  • 创建 student.ts 类

 

让我们使用以下命令创建课程: -

ng g class student

spring angular crud application

现在，在 student 类中指定必填字段。

export class student {
    student_id:number;
    student_name:string;
    student_email:string;
    student_branch:string;
}

此类的目的是将指定的字段与spring实体类的字段进行映射。

 

  • 编辑 student.service.ts 文件

 

import { injectable } from '@angular/core';
import { httpclient } from '@angular/common/http';
import { observable } from 'rxjs';
@injectable({
  providedin: 'root'
})
export class studentservice {
  private baseurl = 'http://localhost:8080/api/';
  constructor(private http:httpclient) { }
  getstudentlist(): observable<any> {
    return this.http.get(`${this.baseurl}`+'students-list');
  }
  createstudent(student: object): observable<object> {
    return this.http.post(`${this.baseurl}`+'save-student', student);
  }
  deletestudent(id: number): observable<any> {
    return this.http.delete(`${this.baseurl}/delete-student/${id}`, { responsetype: 'text' });
  }
  getstudent(id: number): observable<object> {
    return this.http.get(`${this.baseurl}/student/${id}`);
  }
  updatestudent(id: number, value: any): observable<object> {
    return this.http.post(`${this.baseurl}/update-student/${id}`, value);
  }
  
}

 

  • 编辑 add-student.component.ts 文件

 

import { component, oninit } from '@angular/core';
import { studentservice } from '../student.service';
import {formcontrol,formgroup,validators} from '@angular/forms';
import { student } from '../student';
@component({
  selector: 'app-add-student',
  templateurl: './add-student.component.html',
  styleurls: ['./add-student.component.css']
})
export class addstudentcomponent implements oninit {
  constructor(private studentservice:studentservice) { }
  student : student=new student();
  submitted = false;
  ngoninit() {
    this.submitted=false;
  }
  studentsaveform=new formgroup({
    student_name:new formcontrol('' , [validators.required , validators.minlength(5) ] ),
    student_email:new formcontrol('',[validators.required,validators.email]),
    student_branch:new formcontrol()
  });
  savestudent(savestudent){
    this.student=new student();   
    this.student.student_name=this.studentname.value;
    this.student.student_email=this.studentemail.value;
    this.student.student_branch=this.studentbranch.value;
    this.submitted = true;
    this.save();
  }
  
  save() {
    this.studentservice.createstudent(this.student)
      .subscribe(data => console.log(data), error => console.log(error));
    this.student = new student();
  }
  get studentname(){
    return this.studentsaveform.get('student_name');
  }
  get studentemail(){
    return this.studentsaveform.get('student_email');
  }
  get studentbranch(){
    return this.studentsaveform.get('student_branch');
  }
  addstudentform(){
    this.submitted=false;
    this.studentsaveform.reset();
  }
}

 

  • 编辑 add-student.component.html 文件

 

<h3>create student</h3>
<div class="row">
  <div class="col-sm-4"></div>
  <div class="col-sm-4" >
    <div [hidden]="submitted" style="width: 400px;">
      <form [formgroup]="studentsaveform" #savestudent (ngsubmit)="savestudent(savestudent)">
          <div class="form-group">
              <label for="name">student name</label>
              <input type="text" class="form-control"  formcontrolname="student_name" data-toggle="tooltip" 
                 data-placement="right" title="enter student name" >
              <div class="alert alert-danger" *ngif = "(studentname.touched) && (studentname.invalid)" 
                style="margin-top: 5px;">
                  <span *ngif="studentname.errors.required">student name is required
                    <span *ngif = "studentname.errors.minlength"> 
                        minlength error 
                                       
                </div>
          </div>
  
          <div class="form-group">
              <label for="name">student email</label>
              <input type="text" class="form-control" formcontrolname="student_email" 
                data-toggle="tooltip" data-placement="right" title="enter student email">
                <div class="alert alert-danger" *ngif = "(studentemail.touched) && (studentemail.invalid)" 
                style="margin-top: 5px;">
                  <span *ngif="studentemail.errors.required">student email is required
                    <span *ngif = "studentemail.errors.email"> 
                        invalid email format 
                                       
                </div>
          </div>
  
          <div class="form-group">
              <label for="branch">student branch</label>
                <select class="form-control" formcontrolname="student_branch" data-toggle="tooltip" 
                      data-placement="right" title="select student branch">
                    <option value="null">--select branch--</option>
                  <option value="b-tech">b-tech</option>
                  <option value="bca">bca</option>
                  <option value="mca">mca</option>
                  <option value="m-tech">m-tech</option>
                </select>
          </div>
  
          <button type="submit" class="btn btn-success">submit</button>
      </form>
  </div>
  </div>
  <div class="col-sm-4"></div>
</div>
<div class="row">
  <div class="col-sm-4"></div>
  <div class="col-sm-4">
      <div [hidden]="!submitted">
         <h4>student added successfully!</h4>
         <button (click)="addstudentform()" class='btn btn-primary'>add more student</button>
      </div>      
  </div>
  <div class="col-sm-4"></div>
</div>

单击 添加学生时，将生成以下页面:

spring angular crud应用程序

现在，填写所需的详细信息，然后提交以添加学生。

 

  • 编辑 student-list.component.ts 文件

 

import { component, oninit } from '@angular/core';
import { studentservice } from '../student.service';
import { student } from '../student';
import { observable,subject } from "rxjs";
import {formcontrol,formgroup,validators} from '@angular/forms';
@component({
  selector: 'app-student-list',
  templateurl: './student-list.component.html',
  styleurls: ['./student-list.component.css']
})
export class studentlistcomponent implements oninit {
 constructor(private studentservice:studentservice) { }
  studentsarray: any[] = [];
  dtoptions: datatables.settings = {};
  dttrigger: subject<any>= new subject();
  students: observable<student[]>;
  student : student=new student();
  deletemessage=false;
  studentlist:any;
  isupdated = false;    
 
  ngoninit() {
    this.isupdated=false;
    this.dtoptions = {
      pagelength: 6,
      statesave:true,
      lengthmenu:[[6, 16, 20, -1], [6, 16, 20, "all"]],
      processing: true
    };   
    this.studentservice.getstudentlist().subscribe(data =>{
    this.students =data;
    this.dttrigger.next();
    })
  }
  
  deletestudent(id: number) {
    this.studentservice.deletestudent(id)
      .subscribe(
        data => {
          console.log(data);
          this.deletemessage=true;
          this.studentservice.getstudentlist().subscribe(data =>{
            this.students =data
            })
        },
        error => console.log(error));
  }
  updatestudent(id: number){
    this.studentservice.getstudent(id)
      .subscribe(
        data => {
          this.studentlist=data           
        },
        error => console.log(error));
  }
  studentupdateform=new formgroup({
    student_id:new formcontrol(),
    student_name:new formcontrol(),
    student_email:new formcontrol(),
    student_branch:new formcontrol()
  });
  updatestu(updstu){
    this.student=new student(); 
   this.student.student_id=this.studentid.value;
   this.student.student_name=this.studentname.value;
   this.student.student_email=this.studentemail.value;
   this.student.student_branch=this.studentbranch.value;
   console.log(this.studentbranch.value);
   
   this.studentservice.updatestudent(this.student.student_id,this.student).subscribe(
    data => {     
      this.isupdated=true;
      this.studentservice.getstudentlist().subscribe(data =>{
        this.students =data
        })
    },
    error => console.log(error));
  }
  get studentname(){
    return this.studentupdateform.get('student_name');
  }
  get studentemail(){
    return this.studentupdateform.get('student_email');
  }
  get studentbranch(){
    return this.studentupdateform.get('student_branch');
  }
  get studentid(){
    return this.studentupdateform.get('student_id');
  }
  changeisupdate(){
    this.isupdated=false;
  }
}

 

  • 编辑 student-list.component.html 文件

 

<div class="panel panel-default">
  <div class="panel-heading">
      <h1 style="text-align: center">students</h1><br>
      <div class="row" [hidden]="!deletemessage">
           
                <div class="col-sm-4"></div>
                <div class="col-sm-4">
                        <div class="alert alert-info alert-dismissible">
                                <button type="button" class="close" data-dismiss="alert">×</button>
                                <strong>student data deleted</strong>
                        </div>
                </div>
                <div class="col-sm-4"></div>
        </div>           
    </div>
  
  <div class="panel-body">
      <table  class="table table-hover table-sm" datatable [dtoptions]="dtoptions"
      [dttrigger]="dttrigger"  >
          <thead class="thead-light">
              <tr>
                  <th>student name</th>
                  <th>student email</th>
                  <th>student branch</th>
                  <th>action</th>
                  
              </tr>
          </thead>
          <tbody>
               <tr *ngfor="let student of students ">
                  <td>{{student.student_name}}</td>
                  <td>{{student.student_email}}</td>
                  <td>{{student.student_branch}}</td>
                  <td><button (click)="deletestudent(student.student_id)" class='btn btn-primary'><i class="fa fa-futboll-0">delete</i></button> 
                    <button (click)="updatestudent(student.student_id)" class='btn btn-info'
                    data-toggle="modal" data-target="#mymodal">update</button>
                  </td>
                </tr> 
          </tbody><br>
      </table>
  </div>
</div> 
<div class="modal" id="mymodal">
        <div class="modal-dialog">
          <div class="modal-content">
                <form [formgroup]="studentupdateform" #updstu (ngsubmit)="updatestu(updstu)">
            <!-- modal header -->
            <div class="modal-header">
              <h4 class="modal-title" style="text-align: center">update student</h4>
              
            </div>
            
            <!-- modal body -->
            <div class="modal-body" *ngfor="let student of studentlist " >
                <div [hidden]="isupdated">
                    <input type="hidden" class="form-control"  formcontrolname="student_id" [(ngmodel)]="student.student_id">
                            <div class="form-group">
                                <label for="name">student name</label>
                                <input type="text" class="form-control"  formcontrolname="student_name" [(ngmodel)]="student.student_name"  >
                            </div>
                    
                            <div class="form-group">
                                <label for="name">student email</label>
                                <input type="text" class="form-control" formcontrolname="student_email" [(ngmodel)]="student.student_email">
                            </div>
                    
                            <div class="form-group">
                                <label for="name">student branch</label>
                                  <select class="form-control" formcontrolname="student_branch" required>                                   
                                    <option value="b-tech" [selected]="'b-tech' == student.student_branch">b-tech</option>
                                    <option value="bca" [selected]="'bca' == student.student_branch">bca</option>
                                    <option value="mca" [selected]="'mca' == student.student_branch" >mca</option>
                                    <option value="m-tech" [selected]="'m-tech' == student.student_branch">m-tech</option>
                                  </select>                               
                            </div>                   
                  </div>  
                  <div [hidden]="!isupdated">
                      <h4>student detail updated!</h4>
                  </div>        
                    
            </div>
            
            <!-- modal footer -->
            <div class="modal-footer" >
              <button type="submit" class="btn btn-success" [hidden]="isupdated">update</button>
              <button type="button" class="btn btn-danger" data-dismiss="modal" (click)="changeisupdate()">close</button>
            </div>
            
        </form>
          </div>
        </div>
      </div>

单击 查看学生时，将生成以下页面:

spring angular crud应用程序

单击 更新学生时，将出现以下引导程序模式:

spring angular crud application

在这里，我们可以更新现有学生的详细信息。

单击 delete (删除)，现有学生将被删除从数据库中。让我们在删除特定学生后查看结果。

spring angular crud应用程序

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