How would I find the existing objects id in the database using spring boot?-CodePudding

The application has 2 functionalities where I can create a new script file and also edit the existing script file. The logic I have for both create and edit will basically be the same with the only major difference being that for edit instead of creating new scripts, I will have to find the existing script and override it. I am not sure how I should go finding the script by id in spring boot.

Here is my create script functionality:

Controller Class:

@Controller
@RequestMapping("/api/auth/")
public class TestServerController {
   @Autowired
   ScriptsRepository scriptsRepository;
   @Autowired
   LineItemRepository lineItemRepository;
   @Autowired
   LineItemDataRepository lineItemDataRepository;
  public TestServerController() {

  }
   @CrossOrigin(origins = "*")
   @RequestMapping(value = "createScript")
   public ResponseEntity<?> createScript(@RequestBody String body, @RequestParam String name) throws Exception {


      JSONArray script = new JSONArray(body);
      Scripts new_script = new Scripts(name);


      scriptsRepository.save(new_script);
      for (int i = 0;i<script.length();i  ) {

         JSONObject current_line_item = (JSONObject) script.get(i);

         if(!current_line_item.has("keyword")  ){
            return ResponseEntity
                  .badRequest()
                  .body(new MessageResponse("Invalid Json Object"));
         }
         String keyword = current_line_item.getString("keyword");
         LineItem new_li = new LineItem(keyword,i);
         new_li.setSid(new_script);

         lineItemRepository.save(new_li);

         int order = 0;
         var keys = current_line_item.keys();
         for (Iterator<String> it = keys; it.hasNext(); ) {
            var key = it.next();
            if(key.equals("keyword")){
               continue;
            }
            var value = current_line_item.getString(key);
            // we will need to do something about this if the column values arent strings

            LineItemData vb = new LineItemData(key,value,order);
            vb.setLid(new_li);
            lineItemDataRepository.save(vb);
            order  ;

         }

      }

      return ResponseEntity.ok(new MessageResponse("Script Uploaded Successfully"));
   }

For the edit script, I was thinking to remove Scripts new_script = new Scripts(name); and use the findbyId to find the script in the database and pass that in the scriptsRepository.save(new_script); where instead of new_script, I would just have the script file using the id. This hasn't worked for me and I'm getting errors. Is there another way to go about this?

CodePudding user response：

When you use scriptsRepository.save(script) it will save the script on your Database. But if you already have a script in the database with the same ID of the one you are passing through the parameter it will not create a new one, but just update it with the information of the one you are trying to save.

A Script controller (only with the update method), following REST API design, would be something like this:

@RestController
@RequestMapping("/scripts")
public class ScriptController {

    @Autowired
    ScriptRepository scriptRepository;

    @PutMapping("/{id}")
    @ResponseStatus(HttpStatus.OK)
    public Script update(@RequestBody Script script, @PathVariable long id) {

        if (scriptRepository.findById(id).isEmpty()) {
            throw new RecordNotFoundException();
        }
        script.setId(id);
        return scriptRepository.save(script);
    }
}

To access it you would need to use the endpoint localhost:8080/scripts/{id} (in case you use the default Spring Boot localhost:8080).

You don't need to throw the exception but in case you want you would need to create a simple class like this:

import org.springframework.http.HttpStatus;
import org.springframework.web.bind.annotation.ResponseStatus;

@ResponseStatus(HttpStatus.NOT_FOUND)
public class RecordNotFoundException extends RuntimeException {

}