logo
down
shadow

Getting field name as string for already defined class. Is that possible?


Getting field name as string for already defined class. Is that possible?

Content Index :

Getting field name as string for already defined class. Is that possible?
Tag : java , By : Shane
Date : December 01 2020, 04:47 PM

it fixes the issue It is not possible for Fields to get name as String of the field this way, using reflection.

Comments
No Comments Right Now !

Boards Message :
You Must Login Or Sign Up to Add Your Comments .

Share : facebook icon twitter icon

Using SubSonic, how to add a field to a pre-defined class?


Tag : development , By : user186435
Date : March 29 2020, 07:55 AM
like below fixes the issue Use a partial class. All classes in Subsonic are defined as partial. What you do is (in a separate file than the one that is generated by Subsonic), you create another part of the partial class with the additional property.
Option 2 here: http://jamesewelch.wordpress.com/2008/09/24/how-to-use-custom-audit-fields-with-subsonic/

how can it be that my class field changes although its defined static?


Tag : class , By : lili
Date : March 29 2020, 07:55 AM
this will help Declaring a field as final means that you can't assign a new value to it. If, however, that field contains an Object, you can still modify non-final fields inside of that Object. The code below should illustrate what I mean.
class Foo {
    private final Bar foo; 

    public Foo() {
        foo = new Bar();
    }

    public void testFoo() {
        this.foo = new Bar(); // compile error
        this.foo.setBar("Test"); // works fine
    }
}

class Bar {
    private String bar;

    public void setBar(String bar) {
        this.bar = bar;
    }

    public String getBar() {
        return bar;
    }
}

Jackson - Map JSON string field to class/pojo that has only one field (a string)


Tag : java , By : Boyer C.
Date : March 29 2020, 07:55 AM
fixed the issue. Will look into that further Use @JsonCreator for deserializing and use @JsonValue for Serializing. Have tested the code. Please make sure that getJsonString() is public method.
For example:
public class User{
    private String username;

    @JsonValue
    public String getJsonString() {
         return username;
    }

    @JsonCreator
    private static User parseJson(String jsonStr) {
        User u = new User();
        u.username = jsonStr;
        return u;
    }

    public static void main(String[] args) {
        User u = new User();
        u.userName = "Niraj";

        ObjectMapper m = new ObjectMapper();
        String jsonString = m.writeValueAsString(u);
        User u1 = m.readValue(jsonString, User.class);
    }
}

Getting data from a string defined table name filtered on a string defined field


Tag : chash , By : Henry Fatino
Date : March 29 2020, 07:55 AM
Hope that helps I am trying to return the contents of a Where filtered table of dynamic type based on a dynamic field name from an array of values. , There any many flaws in this single line of code:
var results = typeof(System.Linq.Enumerable).GetMethods().Where(x => x.Name == "Where").First().Invoke(db, new object[] { lambda });
IQueryable results = Queryable.Where((dynamic)entityTable, (dynamic)lambda);
public static MethodCallExpression Call(
    Type type, 
    string methodName,
    Type[] typeArguments,
    params Expression[] arguments);
var query = (IQueryable)db.GetType().GetProperty(linkingTable).GetValue(db);
// e =>
var entity = Expression.Parameter(query.ElementType, "e");
// ids.Contains(e.idField)
// = Enumerable<int>.Contains(ids, e.idField)
var containsCall = Expression.Call(
    typeof(Enumerable),
    nameof(Enumerable.Contains),
    new Type[] { typeof(int) },
    Expression.Constant(ids),
    Expression.Property(entity, idField)
);
// e => ids.Contains(e.idField)
var predicate = Expression.Lambda(containsCall, entity);
// query = query.Where(predicate);
query = Queryable.Where((dynamic)query, (dynamic)predicate);
// query.Where(predicate)
// = Queryable.Where<ElementType>(query, predicate)
var whereCall = Expression.Call(
    typeof(Queryable),
    nameof(Queryable.Where),
    new Type[] { query.ElementType },
    query.Expression,
    predicate
);
// query = query.Where(predicate)
query = query.Provider.CreateQuery(whereCall);
var query = ((IQueryable)db.GetType().GetProperty(linkingTable).GetValue(db))
    .Where($"@0.Contains({idField})", ids);

How to new a class by name that defined in the field of type in generics class


Tag : java , By : Mikael
Date : March 29 2020, 07:55 AM
Related Posts Related QUESTIONS :
  • Is there a way to SELECT using "GREATEST(field1, field2)" where field1 and field2 are aggregate sums in the sa
  • How to handle JSON objects wrapped into one JSON object with retrofit2?
  • Configure Hazelcast CPSubsystem Retries Timeout
  • how to use onBindViewHolder with multiple items in android RecyclerView
  • No ParameterResolver registered for parameter in BeforeAll method
  • Finding the path in a graph with the least casualties according to the lanchester square law
  • MongoWriteException when inserting into Mongodb with composite custom _id
  • Fetch Oracle procedure metadata with Java when multiple procedure signatures
  • Value modification of key-pair in HashMap and impact for a HashCode
  • Migration from solrj to spring-data-solr
  • How to check if you're still connected to the database with jpa
  • Use Date type in the graphql scheme
  • Split and add the string based on length
  • Is "main" method of spring boot application required when deploy as war
  • Getting the average within specific numbers in an array
  • how to use izpack to make my jar application to installer?
  • What is meant by src in Java Eclipse?
  • Create a mirrored linked list in Java
  • Examples of good JPA Java Desktop Application
  • Translate Java to Python -- signing strings with PEM certificate files
  • Algorithm Analysis tool for java
  • Java serial comm API - what does inputstream.read() return if a timeout occurs?
  • How do I make a background thread in Java that allows the main application to exit completely? This works in Linux, but
  • How to add an image dynamically at runtime in java
  • Java App on Mac asking for allow network connections everytime
  • Best actively maintained Java XMPP Library?
  • Multi-Threaded Application - Help with some pseudo code!
  • Scoping a StringBuilder inside a for loop
  • How to specify hash algorithm when updating LDAP via Java?
  • Class not found exception (org.apache.openjpa.enhance.PersistenceCapable) thrown in a client of WLS 10
  • In Java ,where in memory are class functions put?
  • How do I test expectedExceptionsMessageRegExp (exception message) using TestNG?
  • Help In understanding Multi Dimentional Arrays
  • No bean named '...' is defined and Spring @Resource annotation
  • Singleton design pattern vs Singleton beans in Spring container
  • flashvars object was not working in mozilla browser
  • Shell script to import mysql dump file
  • What are the best practices to separate data from users
  • May I use com.google.code prefix for my packages?
  • How to set classpath in manifest file , while creating JAR from eclipse?
  • dealing with voice in java
  • Error: java.security.AccessControlException: Access denied
  • How to verify the root trust of a ceritifcate
  • Searching for a standalone JSP compiler
  • Spring 2.5 managed servlets: howto?
  • iBatis get executed sql
  • GRAPH: find an algorithm to determine the shortest path from one point to another in a rectangular maze?
  • Efficient JSON encoding for data that may be binary, but is often text
  • How to Read Java File Structure using Java?
  • Java-Hibernate-Newbie: How do I acces the values from this list?
  • Smallest executable for Windows
  • Java: matching two different type of array
  • how to accept valid e-mail id in text box?
  • How can I know where a Null Pointer Exception originated?
  • Memory limited image processing in server
  • Java Multiple ResourceBundles
  • How to serialize Java primitives using Jersey REST
  • Casting objects to Integer,string ,
  • Using Java how can I plot the path of a sprite in a straight line?
  • IntelliJ shortcut for inserting a null check?
  • shadow
    Privacy Policy - Terms - Contact Us © scrbit.com