get number of received parameter from ajax call in java spring and store one parameter as single row in db

Question

I am working on a problem, where user fills the form and click on submit button. An ajax call made which sent the parameters to a controller in java.

These are the parameters sent by the client side:

{"fromDate":"2017-09-23T19:00:00Z","toDate":"2017-10-04T18:59:59Z","listA":"'asd'","listB":"'321'","minimumEntry":"1"}

This is my controller class:

@RestController
public class AssociateController {
@Layout(Layout.NONE)
@RequestMapping(value = "save_associate.json", method = RequestMethod.POST)
  public @ResponseBody AjaxResponseBody save_associate(HttpServletRequest request, Model model,@RequestBody final AssociateParams params) throws Exception {

    Connection oracleconn=null;
    DBHelper dbHelper=new DBHelper();
    try {
        oracleconn = dbHelper.getOracleConnection();
        System.out.println("+++ Associate Controller +++");
        System.out.println(params.getAssociateType());
        System.out.println(params.getDatasetName());
        System.out.println(params.getFromDate());
        System.out.println(params.getToDate());
        System.out.println(params.getListA());
        System.out.println(params.getListB());
        System.out.println(params.getMinimumEntry());
    } catch(Exception e){
         e.printStackTrace();
    }
    finally{
         dbHelper.closeDBConnection(oracleconn);
    }
    return null;

  }
}

AssociateParams.java

public class AssociateParams {
    private String associateType;
    private String datasetName;
    private String fromDate;
    private String toDate;
    private String listA;
    private String listB;
    private String minimumEntry;

    public String getAssociateType() {
        return associateType;
    }
    public void setAssociateType(String associateType) {
        this.associateType = associateType;
    }
    public String getDatasetName() {
        return datasetName;
    }
    public void setDatasetName(String datasetName) {
        this.datasetName = datasetName;
    }
    public String getFromDate() {
        return fromDate;
    }
    public void setFromDate(String fromDate) {
        this.fromDate = fromDate;
    }
    public String getToDate() {
        return toDate;
    }
    public void setToDate(String toDate) {
        this.toDate = toDate;
    }
    public String getListA() {
        return listA;
    }
    public void setListA(String listA) {
        this.listA = listA;
    }
    public String getListB() {
        return listB;
    }
    public void setListB(String listB) {
        this.listB = listB;
    }
    public String getMinimumEntry() {
        return minimumEntry;
    }
    public void setMinimumEntry(String minimumEntry) {
        this.minimumEntry = minimumEntry;
    }
}

These parameters can vary in every request. User can send 2 or 3 or 4 and so on .. parameters to the controller. Now i want to count the number of parameters and then get key/value pair from request and save new row per parameter. Lets say user sends above response to controller. Then the code will look like this :

for (int a=0;a<parameters.length;a++) {
   // get key
   // get value
   // INSERT INTO TABLE WHERE ID=key AND VALUE=value   
}

After entering the rows, the db will look like this:

ID              |       VALUE
----------------------------------
fromDate        |   2017-09-23T19:00:00Z
toDate          |   2017-10-04T18:59:59Z
listA           |   asd
listB           |   123
minimunEntry    |   1

How can I insert the received parameters from server into DB like this. I am very new to JAVA, so Please any kind of help will be appreciated.