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Mapping a JDBC ResultSet to an object

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生来不讨喜
生来不讨喜 2020-12-04 18:14

I have a user class that has 16 attributes, things such as firstname, lastname, dob, username, password etc... These are all stored in a MySQL database and when I want to re

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  • 有刺的猬
    有刺的猬 (楼主)
    2020-12-04 18:46 

    import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import org.json.simple.JSONObject;
import com.google.gson.Gson;

public class ObjectMapper {

//generic method to convert JDBC resultSet into respective DTo class
@SuppressWarnings("unchecked")
public static Object mapValue(List> rows,Class className) throws Exception
{

        List response=new ArrayList<>(); 
        Gson gson=new Gson();

        for(Map row:rows){
        org.json.simple.JSONObject jsonObject = new JSONObject();
        jsonObject.putAll(row);
        String json=jsonObject.toJSONString();
        Object actualObject=gson.fromJson(json, className);
        response.add(actualObject);
        }
        return response;

    }

    public static void main(String args[]) throws Exception{

        List> rows=new ArrayList>(); 

        //Hardcoded data for testing
        Map row1=new HashMap();
        row1.put("name", "Raja");
        row1.put("age", 22);
        row1.put("location", "India");


        Map row2=new HashMap();
        row2.put("name", "Rani");
        row2.put("age", 20);
        row2.put("location", "India");

        rows.add(row1);
        rows.add(row2);


        @SuppressWarnings("unchecked")
        List res=(List) mapValue(rows, Dto.class);


    }

    }

    public class Dto {

    private String name;
    private Integer age;
    private String location;

    //getters and setters

    }



    Try the above code .This can be used as a generic method to map JDBC result to respective DTO class.
    
    
    
             
    
                                                        
    
            
            
    
              
                
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