I have a simple POJO:
class Person {
String name;
int age;
}
And I want to be able to create an index on a cache that will then allow me to execute the following pseudo-query:
find me all the people whose name is EQUAL to John and their age is GREATERTHAN 30
I've tried MultiExtractor which appears to create the index I want, but when I construct the query using the Filter objects, I seem to still end up with un-optimised queries.
Easiest solution is to add property accessors:
public class Person {
public Person(String name, int age) {
this.name = name;
this.age = age;
}
public String getName() {
return name;
}
public int getAge() {
return age;
}
private String name;
private int age;
}
Now you can query:
// find me all the people whose name is EQUAL to
// John and their age is GREATERTHAN 30
Filter filter = new AndFilter(
new EqualsFilter("getName", "John"),
new GreaterFilter("getAge", Integer.valueOf(30));
Set setKeys = cache.keySet(filter);
You can also code that filter in SQL. See: https://community.oracle.com/message/11217211#11217211
Other resources:
http://vimeo.com/51314443
http://docs.oracle.com/middleware/1213/coherence/develop-applications/api_cq.htm#COHDG5263
https://www.youtube.com/user/OracleCoherence
Related
I am new to AutoFixture so I hope you can help. How do you set some properties in an object but leave others as the AutoFixture default - while using XUnit's [Theory] attribute and an AutoDataAttribute.
For example, in the contrived Airport example below based on Jason Robert's Pluralsight course, when setting the property (or the Airport object) e.g.
f.Customize<Mock<IAirport>>(c => c.Do(m => m.SetupGet(i => i.code).Returns("NOO")));
the other properties are often null, or I have to manually set them rather than letting AutoFixture do it. I would prefer to have cleaner code where the fixtureFactory sets all the properties for the Airport so that the V2 unit test only passed in a single Airport parameter.
So, within the fixtureFactory
How do you set MULTIPLE properties?
How does one use the default AutoFixture values rather than leaving the uninitialized values as
null?
Thanks!
using AutoFixture;
using AutoFixture.AutoMoq;
using AutoFixture.Xunit2;
using Moq;
using System;
using Xunit;
namespace AirportTesterWithAutoFixture
{
public interface IAirport
{
string city { get; set; }
string code { get; set; }
string country { get; set; }
string name { get; set; }
void CallAirTrafficControl();
}
public class Airport : IAirport
{
public string name { get; set; }
public string city { get; set; }
public string code { get; set; }
public string country { get; set; }
public Airport()
{
}
public Airport(string name, string code, string country, string city)
{
this.name = name;
this.code = code;
this.country = country;
this.city = city;
}
public void CallAirTrafficControl()
{
if (this.country.Equals("Canada") && this.code.StartsWith("Y"))
{
// Send "Bonjour!"();
}
else
{
throw new Exception("Invalid code for Canada");
}
}
}
public class UnitTest1
{
[Fact]
public void V1_Validate_ExceptionThrown_ForInvalidCanadianAirportCode()
{
var fixture = new Fixture();
var sut = fixture.Create<Airport>();
// Overwrite code and country with invalid setting for Canada.
sut.country = "Canada";
sut.code = "NOT";
Assert.ThrowsAny<Exception>(() => sut.CallAirTrafficControl());
}
[Theory]
[AutoMoqInvalidAirportDataAttribute]
public void V2_Validate_ExceptionThrown_ForInvalidCanadianAirportCode(IAirport sut, string name, string city)
{
Airport airport = new Airport(name, sut.code, sut.country, city);
Assert.ThrowsAny<Exception>(() => airport.CallAirTrafficControl());
}
}
// https://stackoverflow.com/questions/58998834/how-to-use-ifixture-buildt-with-automoqcustomization-when-t-is-an-interface
public class AutoMoqInvalidAirportDataAttribute : AutoDataAttribute
{
public static Func<IFixture> fixtureFactory = () =>
{
IFixture f = new Fixture().Customize(new AutoMoqCustomization());
f.RepeatCount = 5;
// How do you set MULTIPLE properties?
// How does one use the default AutoFixture values rather than leaving the uninitialized values as null?
// Can one pass a custom property used earlier in the Fixture creation process to another custom property used later?
f.Customize<Mock<IAirport>>(c => c.Do(m => m.SetupGet(i => i.code).Returns("NOT")));
return f;
};
public AutoMoqInvalidAirportDataAttribute() : base(fixtureFactory)
{
}
}
}
AutoFixture does not populate mock properties by default, but it can be done. These blog posts describe how to do it:
https://blog.ploeh.dk/2013/04/05/how-to-configure-automoq-to-set-up-all-properties/
https://blog.ploeh.dk/2013/04/08/how-to-automatically-populate-properties-with-automoq/
Author of AutoFixture does not recommend this approach, however, as he considers declaration of properties in interfaces a design smell.
I could not find the original discussion about this topic unfortunately, but it is hidden somewhere on StackOverflow in the comments. Maybe you will be able to find it if you go through Mark Seemann's profile.
Lets say I have 100 documents with fields
Name
Age
Address
Now suppose my business model is change and I want to add new field call PhoneNumber.
How to add field PhoneNumber in all 100 documents ?
Is is possible to such stuff on NoSQL database?
You will have to write code to iterate all the documents to update, then actually update a new value in each one of them. Firestore has no similar command as "update tablename set x=y where ..." in SQL.
Is is possible to such stuff on NoSQL database?
Yes it is! Assuming you have a User model class that look like this:
public class User {
private String name;
private int age;
private String address;
private String phoneNumber; //Property that is newly added
public User() {}
public User(String name, int age, String address, String phoneNumber) {
this.name = name;
this.age = age;
this.address = address;
this.phoneNumber = phoneNumber;
}
public String getName() { return name; }
public void setName(String name) { this.name = name; }
public int getAge() { return age; }
public void setAge(int age) { this.age = age; }
public String getAddress() { return address; }
public void setAddress(String address) { this.address = address; }
public String getPhoneNumber() { return phoneNumber; }
public void setPhoneNumber(String phoneNumber) { this.phoneNumber = phoneNumber; }
}
To actually add a new property and update it accordingly, you need to use setters. If you are setting the values directly onto the public fields, the setters are not mandatory.
How to add field PhoneNumber in all 100 documents?
As also #Doug Stevenson mentioned in his answer, to solve this, you need to iterate all the documents within your users collection. So please use the following lines of code:
db.collection("users").get().addOnCompleteListener(new OnCompleteListener<QuerySnapshot>() {
#Override
public void onComplete(#NonNull Task<QuerySnapshot> task) {
if (task.isSuccessful()) {
for (DocumentSnapshot document : task.getResult()) {
User user = document.toObject(User.class);
user.setPhoneNumber("+1-111-111-111"); //Use the setter
String id = document.getId();
db.collection("users").document(id).set(user); //Set user object
}
}
}
});
The result of this code would be to add the phoneNumber property to all you User objects with a default value of +1-111-111-111. You can also set the value to null if it's more convenient for you. At the end, the updated object is set right on the corresponding reference.
If you are not using a model class, please see my answer from this post.
I am an android developer, previous I had been working with ActiveAndroid and DBFlow but now we are interested in implement Realm Database to our new projects. The problem is that I am getting an error when trying to add an object to a RealmList inside our models. The error is a Nullpointerexception.
This is my Country model
public class Country extends RealmObject implements Serializable {
#PrimaryKey
private int id;
private String name;
private RealmList<Region> regions;
public Country() {
}
public Country(int id, String name) {
this.id = id;
this.name = name;
}
getter and setters...
And this is my Region model
public class Region extends RealmObject implements Serializable {
#PrimaryKey
private int id;
private String name;
private int countryId;
public RealmList<City> cities;
public Region() {
}
public Region(int id, String name, int countryId ) {
this.id = id;
this.name = name;
this.countryId = countryId;
}
getter and setters...
The main method where I am trying to save the data is
Realm realm = Realm.getDefaultInstance();
realm.beginTransaction();
for (int i = 0; i < 10 ; i++){
Country country=new Country();
country.setId(i);
country.setName("testCountryName " + i);
for (int y = 0; y < 3; y++) {
Region region=new Region();
region.setId(y);
region.setName("testRegionName " + y);
realm.copyToRealmOrUpdate(region);
country.regions.add(region);
}
realm.copyToRealmOrUpdate(country);
}
realm.commitTransaction();
Finally, the only way to avoid the Nullpointerexception error is adding = new RealmList<>(); when I am declaring the RealmList in each model.
I don't find this answer at Realm Docs and the samples never say that I need to initialize the RealmList so, for that reason I am looking for a solution here.
Please help me with this issue.
Well, you're creating unmanaged RealmObjects that are essentially vanilla objects right here:
Country country = new Country();
Region region = new Region();
With that in mind, there's no magic here, that list in country.regions was never initialized by anyone :)
So you'd need this:
country.setRegions(new RealmList<Region>());
region.setCities(new RealmList<City>());
You can avoid this manual creation of lists (if I'm right, anyways) if you create managed copies in the Realm immediately using realm.createObject(__.class, primaryKeyValue);.
Like
Country country = realm.createObject(Country.class, i);
I am making a system for a school project , and one part of it is a TableView that is populated with rows using my own data class InventoryData that has properties correspondent to the table columns. I would like to make cells in some columns editable using a TextField, so that when an edit is committed, it will update the InventoryData object's relevant property.
I tried setting TextFieldTableCell.forTableColumn() as the cell factory of the columns. Although, now after committing the edit, the text in the cell will change, I don't think it is changing the property in the InventoryData object. The reason why I think that, is because when I try to edit that cell again ( after already being edited once), the TextField shows the former value ( before the first edit).
Did I do something wrong , or is that normal behavior and I have to implement the commits myself?
Here's the code for InventoryData :
package UILayer.TableData;
import javafx.beans.property.SimpleIntegerProperty;
import javafx.beans.property.SimpleStringProperty;
import ModelLayer.Product;
public class InventoryData {
// From Product
private Product productObj;
private SimpleIntegerProperty id;
private SimpleStringProperty name;
// Constructor - converts Product obj into InventoryData
public InventoryData(Product product)
{
this.productObj = product;
this.id = new SimpleIntegerProperty(product.getId());
this.name = new SimpleStringProperty(product.getName())
}
// GET & SET
public Product getProduct()
{
return productObj;
}
public int getId() {
return id.get();
}
public void setId(int id) {
this.id.set(id);
}
public String getName() {
return name.get();
}
public void setName(String name) {
this.name.set(name);
productObj.setName(name);
System.out.println(productObj.getName());
}
}
You need your InventoryData class to use the JavaFX Properties pattern. Specifically it needs property-type accessor methods in order to retrieve the property in the table cells. Without this, the cell value factory just calls the standard getName() or getId() method, and wraps the result in a ReadOnlyStringWrapper (or ReadOnlyIntegerWrapper): the table cell cannot change the values of those wrappers (since they are read only).
public class InventoryData {
// From Product
private Product productObj;
private IntegerProperty id;
private StringProperty name;
// Constructor - converts Product obj into InventoryData
public InventoryData(Product product)
{
this.productObj = product;
this.id = new SimpleIntegerProperty(product.getId());
this.name = new SimpleStringProperty(product.getName())
this.name.addListener((obs, oldName, newName) ->
productObj.setName(newName));
}
// GET & SET
public Product getProduct()
{
return productObj;
}
public IntegerProperty idProperty() {
return id ;
}
public final int getId() {
return idProperty().get();
}
public final void setId(int id) {
idProperty().set(id);
}
public StringProperty nameProperty() {
return name ;
}
public final String getName() {
return nameProperty().get();
}
public final void setName(String name) {
this.nameProperty().set(name);
// productObj.setName(name);
// System.out.println(productObj.getName());
}
}
How do I use the JdbcTemplate.query()/queryForList() to run a query using namedParameter and store the result set into a List of 'User's?
User Class:
public class User {
String name = null;
String id = null;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getId() {
return name;
}
public void setId(String id) {
this.id = id;
}
}
Query:
SELECT name, id FROM USERS where email=:email
I'm looking for something like:
ArrayList<User> userList = jdbcTemplate.query(sql_query,
...some_mapper..., etc);
Seems like the answer to the question is not available at one place, on the Internet. Here's what I found out:
For adding the resultset into a List<>, we can use the NamedParameterJdbcTemplate.query() function:
NamedParameterJdbcTemplate jdbcTemplate;
ArrayList<User> usersSearchResult = (ArrayList<User>) jdbcTemplate.query(
USER_LIST_TP_query,
namedParameters,
new RowMapperResultSetExtractor<User>(new UserRowMapper(), 20));
We also have to define a custom RowMapperResultSetExtractor so that JDBC can understand how to convert each row in the result set to the type User.
private class UserRowMapper implements RowMapper<User> {
public User mapRow(ResultSet rs, int rowNum) throws SQLException {
User user = new User();
user.setId(rs.getString("ID"));
user.setName(rs.getString("NAME"));
return user;
}
}