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How to remove multiple rows via checkbox

I am new to spring and I need to be able to delete the selected rows by checkbox. How can I delete multiple rows from the database? I am using Thymeleaf as view.
Here is my code:
HTML
<div class="col-md-12">
<table class="table" id="tableImport">
<thead>
<tr>
<th scope="col">Remove</th>
<th scope="col">Debt Age Rule</th>
<th scope="col">Reminder</th>
<th scope="col">Frequency</th>
<th scope="col">Reorder</th>
</tr>
</thead>
<tbody>
<tr th:each="configCampaign:${listConfigCampaigns}">
<td>
<input type="checkbox" name="my-checkbox">
</td>
<td th:text="${configCampaign.debtagerule}"></td>
<td th:text="${configCampaign.remindebttype}"></td>
<td th:text="'Every '+${configCampaign.every} + ' ' + ${configCampaign.unit}"></td>
<td></td>
</tr>
</tbody>
</table>
<div class="col-md-12" style="text-align: center">
<input class="btn btn-primary" type="button" value="- Remove Selected Action(s)"/>
</div>
</div>
This table shows me data from an arrayList in memory, nothing with a database, I need to remove those selected objects from the array. At the moment I have my controller like this
Entity
private int configid;
private String debtagerule;
private String remindebttype;
private int every;
private String unit;
private boolean selected;
//getters and setters
In addition to the above, this is the controller with which I am currently working
Controller
#GetMapping("/deleteConfigureCampaign")
public String deleteConfig(#ModelAttribute ConfigCampaign configCampaign, Model model) {
listConfigCampaigns.remove(configCampaign);
return "redirect:/configureCampaign";
}

In Spring Boot, You have to use JpaRepository<> for delete data from database and need to understand structure of Spring Boot project.
Here is sturcture of Spring Boot project:
Entity -> Repository -> Service -> Controller -> View.
Here down is code:
Entity
#Table(name = "config_master")
public class ConfigCampaign {
#Id
#GeneratedValue(strategy = GenerationType.IDENTITY)
private Integer configid;
private String debtagerule;
private String remindebttype;
private Integer every;
private String unit;
private boolean selected;
// Constructor, Getter and Setter
}
Repository
Use of #Modifying annotation: It is used to enhance the #Query annotation so that we can execute not only SELECT queries, but also INSERT, UPDATE, DELETE, and even DDL queries
#Repository
public interface ConfigRepo extends JpaRepository<ConfigCampaign, Integer>{
#Modifying
#Transactional
#Query(nativeQuery = true, value = "DELETE FROM config_master WHERE configid IN(?1)")
void delConfig(List<Integer> configId);
}
Service
#Service
public class PojoServiceImpl{
#Autowired
private ConfigRepo configRepo;
#Override
public void delConfig(Integer[] configId) {
configRepo.delConfig(Arrays.asList(configId));
}
}
Controller
// Show table of Config Campaign
#RequestMapping(value = "/showconfig", method = RequestMethod.GET)
public String getConfig(Model mdl)
{
List<ConfigCampaign> getConfig = pojoService.getAllConfig();
mdl.addAttribute("config", getConfig);
return "showConfigCampaign";
}
// Delete item from Config Campaign
#RequestMapping(value = "/delcampaign", method = RequestMethod.GET)
public String deleteConfig(#RequestParam("cid") Integer[] configId)
{
pojoService.delConfig(configId);
return "redirect:/showconfig";
}
showConfigCampaign
You have to add configData.configid in checkbox.
<form th:action="#{/delcampaign}" th:object="${sconfig}">
<div class="container">
<div class="row">
<div class="col-sm-12">
<table class="table" style="text-align: center">
<thead>
<tr>
<th scope="col">Remove</th>
<th scope="col">Debt Age Rule</th>
<th scope="col">Reminder</th>
<th scope="col">Frequency</th>
</tr>
</thead>
<tbody>
<tr th:each="configData: ${config}">
<td><input type="checkbox" name="cid" th:value="${configData.configid}"/></td>
<td th:text="${configData.debtagerule}"></td>
<td th:text="${configData.remindebttype}"></td>
<td th:text="${configData.every}"></td>
</tr>
</tbody>
</table>
<input type="submit" value="Delete Users" />
</div>
</div>
</div>
</form>

Spring MVC new row in database is created while want to update

I write my first form using Spring MVC pattern and Hibernate.
I have a problem when I want to update existing row in table.
After click "Edit" Buttno in a table, correct row is found in db. Then I can update "name" field and click SAVE button. Than in database i created new row with new ID.
I have wrote two System.out to check current values of object.
My Controller class:
#Controller
//#RequestMapping("/")
public class InterventionController {
#Autowired
private InterventionService interventionService;
#GetMapping("/")
public String viewHomePage(Model model){
List<InterventionModel> interventionList = interventionService.listAll();
model.addAttribute("interventionList", interventionList);
return "index";
}
#GetMapping("/new")
public String addInterventionForm(Model model){
InterventionModel interventionModel = new InterventionModel();
model.addAttribute("interventionModel", interventionModel);
System.out.println(model.toString());
return "new_intervention";
}
#RequestMapping(value="/save", method = RequestMethod.POST)
public String saveIntervention(#ModelAttribute("interventionModel")InterventionModel interventionModel){
System.out.println("Object retreived from editing view "+interventionModel); // <- just to check in console object attributes
interventionService.save(interventionModel);
return "redirect:/";
}
#RequestMapping("/edit/{id}")
public ModelAndView showEditInterventionForm(#PathVariable(name="id") Long id){
ModelAndView mav = new ModelAndView("edit_intervention");
InterventionModel interventionModel = interventionService.get(id).get(); // <-- Optional received from service layer
mav.addObject("interventionModel", interventionModel);
System.out.println("Object retrieved from database : "+interventionModel); // <- just to check in console object attributes
return mav;
}
#GetMapping("/delete/{id}")
public String deleteIntervention(#PathVariable(name="id") Long id){
interventionService.delete(id);
return "redirect:/";
}
My InterventionModel class doesn't contain any annotation. I don't know if that is a mistake, but that object is DTO between controller and service layer. In the service layer, it is mapped to the entity which is annotated #Entity.
public class InterventionModel {
private Long id;
private String name;
public InterventionModel() {
}
public InterventionModel(Long id, String name) {
this.id = id;
this.name = name;
}
public Long getId() {
return id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
#Override
public String toString() {
return "InterventionModel{" +
"id=" + id +
", name='" + name + '\'' +
'}';
} }
index.html
<!DOCTYPE html>
<html xmlns:th="http://www.thymeleaf.org">
<head>
<meta charset="ISO-8859-1">
<title>Interventions</title>
</head>
<body>
<div align="center">
<h1>Interventions</h1>
Create new Intervention
<br><br>
<table border="2" cellpadding="10">
<thead>
<tr>
<th>Intervention Id</th>
<th>Name</th>
<th>Actions</th>
</tr>
</thead>
<tbody>
<tr th:each="intervention :${interventionList}">
<td th:text="${intervention.id}">Intervention Id</td>
<td th:text="${intervention.name}">Name</td>
<td>
<a th:href="#{'/edit/' + ${intervention.id}}">Edit</a>
<a th:href="#{'/delete/' + ${intervention.id}}">Delete</a>
</td>
</tr>
</tbody>
</table>
</div>
</body>
</html>
and edit_intervention.html
<!DOCTYPE html>
<html xmlns:th="http://www.thymeleaf.org">
<head>
<meta charset="ISO-8859-1">
<title>Edit Intervention</title>
</head>
<body>
<div align="center">
<h1>Edit Intervention</h1>
<br/>
<form action="#" th:action="#{/save}" th:object="${interventionModel}" method="post">
<table border="0" cellpadding="10">
<tr>
<td>Intervention ID</td>
<!-- <td><input type="text" th:field="*{id}" readonly="readonly"/></td>-->
<td><input type="text" th:field="*{id}" readonly="readonly"/></td>
</tr>
<tr>
<td>Intervention name</td>
<td><input type="text" th:field="*{name}"/></td>
</tr>
<tr>
<td colspan="2"><button type="submit">Save</button> </td>
</tr>
</table>
</form>
</div>
</body>
</html>
What is curious for me. Object when is retrieved from DB has proper attributes (id, name) than Model is created and sent to edit_intervention.html form. After changing name, it goes back to save method but there ID number is "null", instead of name which contains changed new value.
For me (as a beginner) it looks like no all attributes are transferred from the view to the save method in controller. When we have ID set to "null" it's a sign for hibernate to create new row.
I guess there is a minor failure which I cannot find.
Logs from terminal when I call update form:
and view how table after modification looks like:
Thank you in advance for help.

As you see your id field is null. Because probably the Long value wasn't set.
In entity class you should mark id property as #Id, also you can always add the #GeneratedValue annotation above.

How to save selected for loop data in mysql database?

I'm new to spring boot and struck in a prob for some time now. In my thymeleaf page i have used a for loops and i need to save currently iterating item in the database.(ex:im using days of the week in a for loop and a user can select a subject for each item in my for loo, then 5 sql rows should be saved with day and subject) but currently it doesn't save the date and save 2 selected subjects in 1 sql row
Add time Table thymeleaf view
<!DOCTYPE html>
<html xmlns:th="https://www.thymeleaf.org">
<head>
<link rel="stylesheet" type="text/css" href="static/css/timeTableMapping.css" th:href="#{/css/timeTableMapping.css}">
<meta charset="UTF-8">
<title>Time Table</title>
</head>
<body>
</form>
<div class="container2">
<form action="#" th:action="#{/timeTableMapping/save}" th:object="${timeTableMapping}" method="post">
<table border="0" cell[adding="10">
<tr>
<td><h1>Time Table:</h1></td>
<td>
<select th:field="*{time_table_code}">
<option value="">Choose..</option>
<option th:each="timeTable: ${timeTables}" th:value="${timeTable.name}" th:text="${timeTable.name}"/>
</select>
</td>
</tr>
</table>
<table border="1" >
<thead>
<tr>
</tr>
<br>
<th:block th:each="day : ${days}">
<th th:value="${day.name}" th:text="${day.name}"></th>
</th:block>
</thead>
<tbody>
<th:block th:each="day : ${days}">
<td>
<select th:field="*{subject_code}">
<option value=""></option>
<option th:each="subject: ${subjects}" th:value="${subject.subject_code}" th:text="${subject.name}"/>
</select>
</td>
</th:block>
<tr>
<td colspan="2">
<button type="submit">Save</button>
</td>
</tr>
</tbody>
</table>
</form>
</div>
</body>
</html>
Time Table Mapping Controller
#Controller
public class TimeTableMappingController {
#Autowired
private TimeTableMappingDAO timeTableMappingDAO;
#Autowired
private TimeTableDAO timeTableDAO;
#Autowired
private SubjectDAO subjectDAO;
#Autowired
private StudentGroupDAO studentGroupDAO;
#Autowired
private DayDAO dayDAO;
#RequestMapping("/timeTableMapping")
public String viewHomePage(Model model){
List<TimeTableMapping> timeTableMappingDetails= timeTableMappingDAO.findAll();
model.addAttribute("timeTableMappingDetails",timeTableMappingDetails);
return "timeTableMapping";
}
#RequestMapping("/timeTableMapping/new")
public String addTimeTableMapping(Model model){
System.out.println("hey");
System.out.println("hey");
TimeTableMapping timeTableMapping =new TimeTableMapping();
model.addAttribute("timeTableMapping",timeTableMapping);
List<TimeTable> timeTableDetail = timeTableDAO.findAll();
model.addAttribute("timeTables", timeTableDetail);
List<Subject> subjectDetail = subjectDAO.findAll();
model.addAttribute("subjects", subjectDetail);
List<Day> dayDetails = dayDAO.findAll();
model.addAttribute("days",dayDetails);
List<Time> timeDetails = timeDAO.findAll();
model.addAttribute("times",timeDetails);
return "addTimeTableMapping";
}
#RequestMapping(value="/timeTableMapping/save",method= RequestMethod.POST)
public String saveTimeTable(#ModelAttribute("timeTableMapping") TimeTableMapping timeTableMapping){
timeTableMappingDAO.save(timeTableMapping);
return "redirect:/timeTableMapping";
}
/*
#RequestMapping(value="/timeTableMapping/saveAll",method= RequestMethod.POST)
public String saveAll(#ModelAttribute("timeTableMapping") TimeTableMapping timeTableMapping){
timeTableDAO.saveAll(timeTableMapping);
return "redirect:/timeTableMapping";
}*/
#RequestMapping("/timeTableMapping/edit/{id}")
public ModelAndView updateTimeTable(#PathVariable(name="id")Long id){
ModelAndView mav=new ModelAndView(("updateTimeTable"));
TimeTable timeTable = timeTableDAO.findById(id);
mav.addObject("timeTable",timeTable);
List<Subject> subjectDetails = subjectDAO.findAll();
mav.addObject("subjects", subjectDetails);
List<StudentGroup> studentGroupDetails = studentGroupDAO.findAll();
mav.addObject("studentGroups",studentGroupDetails);
List<Day> dayDetails = dayDAO.findAll();
mav.addObject("days",dayDetails);
List<Time> timeDetails = timeDAO.findAll();
mav.addObject("times",timeDetails);
return mav;
}
#RequestMapping("/timeTableMapping/delete/{id}")
public String deleteProduct(#PathVariable(name="id") Long id){
timeTableDAO.delete(id);
return "redirect:/timeTable";
}
}
Add Time Table DAO
#Service
public class TimeTableMappingDAO {
#Autowired
TimeTableRepository timeTableRepository;
#Autowired
TimeTableMappingRepository timeTableMappingRepository;
//to save a time table
public TimeTableMapping save(TimeTableMapping timeTableMapping){
return timeTableMappingRepository.save(timeTableMapping);
}
//#Override
public void saveAll(List<TimeTableMapping> timeTableMapping) {
List<TimeTableMapping> timetable=new ArrayList<>();
timeTableMappingRepository.saveAll(timetable).forEach(timeTableMapping::add); // TimeTable repository
}
/*
public TimeTableMapping saveAll(TimeTableMapping timeTableMapping){
return timeTableMappingRepository.saveAll(timeTableMapping);
}
*/
//to search all
public List<TimeTableMapping> findAll(){
return timeTableMappingRepository.findAll();
}
//get by id
public TimeTableMapping findById(Long id){
return timeTableMappingRepository.findById(id).orElse(null);
}
//delete
public void delete(Long id){
timeTableMappingRepository.deleteById(id);
}
}
Time Table Mapping Repository
#Repository
public interface TimeTableMappingRepository extends JpaRepository<TimeTableMapping, Long> {
}

Before auto wiring TimeTableMappingRepository in your DAO, you should add #Repository on interface TimeTableMappingRepository.
Just like this
#Repository
public interface TimeTableMappingRepository extends JpaRepository {}
By Adding #Repository on the interface, spring-data-jpa will create a proxy object of this interface on runtime and you will be able to autowired it.

You are getting more than one data. So you should use List<TimeTableMapping> timeTableMapping
In your service Implementation, you can pass the list that you got adn save all
#Override
public void saveAll(List<TimeTableMapping> timeTableMapping) {
List<TimeTableMapping> timetable=new ArrayList<>();
repository.saveAll(timetable).forEach(timeTableMapping::add); // TimeTable repository
}

populating thymeleaf dropdown with data of another table

i'm new to spring-boot. In my system there are two models named subject,course(two databases with the same names and connected by the foreign key course_id).I need to make it possible to select course name in a dropdown list in the addSubject thymeleaf form. Can someone please tell me how to do this
Subject.DAO file
#Service
public class SubjectDAO {
#Autowired
SubjectRepository subjectRepository;
//to save a subject
public Subject save(Subject subject){
return subjectRepository.save(subject);
}
//to search all subjects
public List<Subject> findAll(){
return subjectRepository.findAll();
}
//get a subject by id
public Subject findById(Long id){
return subjectRepository.findById(id).orElse(null);
}
//delete a subject
public void delete(Long id){
subjectRepository.deleteById(id);
}
}
Course.DAO file
#Service
public class CourseDAO {
#Autowired
CourseRepository courseRepository;
//to save a course
public Course save(Course course){
return courseRepository.save(course);
}
//to search all courses
public List<Course> findAll(){
return courseRepository.findAll();
}
//get a course by id
public Course findById(Long id){
return courseRepository.findById(id).orElse(null);
}
//delete a course
public void delete(Long id){
courseRepository.deleteById(id);
}
}
Subject Controller
#Controller
public class SubjectController {
#Autowired
private SubjectDAO subjectDAO;
#RequestMapping("/subject")
public String viewHomePage(Model model){
List<Subject> subjectDetails= subjectDAO.findAll();
model.addAttribute("subjectDetails",subjectDetails);
return "subject";
}
#RequestMapping("/subject/new")
public String addSubject(Model model){
Subject subject =new Subject();
model.addAttribute("subject",subject);
return "addSubject";
}
#RequestMapping(value="/subject/save",method= RequestMethod.POST)
public String saveCourse(#ModelAttribute("subject") Subject subject){
subjectDAO.save(subject);
return "redirect:/subject";
}
#RequestMapping("/subject/edit/{id}")
public ModelAndView updateSubjcet(#PathVariable(name="id")Long id){
ModelAndView mav=new ModelAndView(("updateSubject"));
Subject subject=subjectDAO.findById(id);
mav.addObject("subject",subject);
return mav;
}
#RequestMapping("/subject/delete/{id}")
public String deleteProduct(#PathVariable(name="id") Long id){
subjectDAO.delete(id);
return "redirect:/subject";
}
}
Subject html file
<!DOCTYPE html>
<html xmlns:th="https://www.thymeleaf.org">
<head>
<meta charset="UTF-8">
<title>Adding a Subject</title>
</head>
<body>
<div align="center">
<h1>Add a new Subject</h1>
<br/>
<form action="#" th:action="#{/subject/save}" th:object="${subject}" method="post">
<table border="0" cell[adding="10">
<tr>
<td>Subject code:</td>
<td><input type="text" th:field="*{course_code}" /></td>
</tr>
<tr>
<td>Subject Name:</td>
<td><input type="text" th:field="*{name}" /></td>
</tr>
<tr>
<td>Course:</td>
<td>
<select>
<option value=""></option>
</select>
Z
</td>
</tr>
<tr>
<td colspan="2"><button type="submit">Save</button></td>
</tr>
</table>
</form>
</div>
</body>
</html>

So you want to load Course combo inside subject html
You need to modify subject controller
#RequestMapping("/subject")
public String viewHomePage(Model model){
List<Subject> subjectDetails= subjectDAO.findAll();
List<Course> courseDetail= courseDAO.findAll();
model.addAttribute("subjectDetails",subjectDetails);
model.addAttribute("courses",courseDetail);
return "subject";
}
In HTML
<tr>
<td>Course:</td>
<td>
<select th:field="*{course_code}">
<option value="">Choose..</option>
<option th:each="course: ${courses}" th:value="${course.id}" th:text="${course.name}" />
</select>
</td>
</tr>
<tr>
Edit 1:
I think you are loading addSubject.html
In that case you need to modify addSubject controller
#RequestMapping("/subject/new")
public String addSubject(Model model){
Subject subject =new Subject();
model.addAttribute("subject",subject);
List<Course> courseDetail= courseDAO.findAll();
model.addAttribute("courses",courseDetail);
return "addSubject";
}
Edit 2:
As per your code in Git I can see
#Autowired
private SubjectDAO subjectDAO;
private CourseDAO courseDAO;
It should be
#Autowired
private SubjectDAO subjectDAO;
#Autowired
private CourseDAO courseDAO;

First add all courses to the ModelMap
model.addAttribute("cources",courseDao.findAll());
Then use th:each attribute to populate select options
<select th:field="*{course}">
<option value="">Choose..</option>
<option th:each="c: ${cources}" th:value="${c.id}" th:text="${c.name}" />
</select>

How to insert the multiple value from select form into database?

My submission form:
<form method="post" action="${pageContext.request.contextPath }/">
<div>
<label>User:</label>
<select name="customer">
<option value="">Select Customer</option>
<c:forEach var="c" items="${ cList }">
<option value="${ c.id }">${ c.name }</option>
</c:forEach>
</select>
</div><br>
<div>
<label>Hobby:</label>
<select name="product" multiple size="8">
<!-- <option value="">Select Items</option> -->
<c:forEach var="p" items="${ pList }">
<option value = "${ p.id }">${ p.productName }</option>
</c:forEach>
</select>
</div>
<br><br>
<input type="submit" value="Send">
</form>
My Controller:
#RequestMapping(value = "/", method = RequestMethod.POST)
public String postHome(Model model, HttpServletRequest request, #ModelAttribute Transcation t){
transactionDao.addTransaction(t);
return "home";
}
In TransactionDaoImpl:
#Override
#Transactional
public void addTranscation(Transcation t) {
session = sessionFactory.openSession();
session.save(t);
session.close();
}
Based on your idea, what type of modifications do i have to make to perform insert operation.