For example, I will send an object Fruits to server side.
The code like this:
public static <T> T call(String url, String ns, String method, Fruits fruits, Class<T> clz) throws AxisFault
{
RPCServiceClient client = new RPCServiceClient();
Options option = client.getOptions();
EndpointReference erf = new EndpointReference(url);
option.setTo(erf);
QName name = new QName(ns, method);
Object[] object = new Object[]{fruits};
Class[] returnTypes = new Class[]{clz};
Object[] reto = client.invokeBlocking(name, object, returnTypes);
T t = (T)reto[0];
return t;
}
The object like this:
public class Fruits implements Serializable
{
private int pear;
private int banana;
private int apple;
public int setPear(int pear){this.pear=pear;}
public int getPear(){return this.pear;}
...
}
The xml part should be this:
...
<fruits>
<pear>10</pear>
<banana>20</banana>
<apple>60</apple>
</fruits>
...
But in fact like this:
...
<fruits>
<apple>60</apple>
<banana>20</banana>
<pear>10</pear>
</fruits>
...
Axis2 makes object's property alphabetical order, but the server doesn't accept. I can't modify the serverside, it is ESB.
The only way to do a success request is to use the Axis2 generated code, I used to use WSDL2Java, but too many redundant code and difficult to maintain. So I want refactor.
I have also tried to use CXF, but it also makes object's property alphabetical order, not followed with WSDL/XSD or DTO defined style.
I've find the reason why CXF makes the ordering, it uses java.beans.BeanInfo to get properties of object, such as:
...
BeanInfo beanInfo = Introspector.getBeanInfo(Fruits.class);
PropertyDescriptor[] propertyDescriptors = beanInfo.getPropertyDescriptors();
...
The property in the array has already alphabetical order.
Who knows how to let Axis2 to serialize the Fruits' property to be correct ordering.
Thank you, the first!
Not sure on Axis2, but if you are using CXF with the JAXB databinding, you can add an annotation like:
#XmlType(name = "fruits", propOrder = { "apple", "banana", "pear" }})
to the Fruits class to tell JAXB what order you need/want them output.
Related
I'm developing a Spring Boot application with Spring Data JPA. I'm using a custom JPQL query to group by some field and get the count. Following is my repository method.
#Query(value = "select count(v) as cnt, v.answer from Survey v group by v.answer")
public List<?> findSurveyCount();
It's working and result is obtained as follows:
[
[1, "a1"],
[2, "a2"]
]
I would like to get something like this:
[
{ "cnt":1, "answer":"a1" },
{ "cnt":2, "answer":"a2" }
]
How can I achieve this?
Solution for JPQL queries
This is supported for JPQL queries within the JPA specification.
Step 1: Declare a simple bean class
package com.path.to;
public class SurveyAnswerStatistics {
private String answer;
private Long cnt;
public SurveyAnswerStatistics(String answer, Long cnt) {
this.answer = answer;
this.count = cnt;
}
}
Step 2: Return bean instances from the repository method
public interface SurveyRepository extends CrudRepository<Survey, Long> {
#Query("SELECT " +
" new com.path.to.SurveyAnswerStatistics(v.answer, COUNT(v)) " +
"FROM " +
" Survey v " +
"GROUP BY " +
" v.answer")
List<SurveyAnswerStatistics> findSurveyCount();
}
Important notes
Make sure to provide the fully-qualified path to the bean class, including the package name. For example, if the bean class is called MyBean and it is in package com.path.to, the fully-qualified path to the bean will be com.path.to.MyBean. Simply providing MyBean will not work (unless the bean class is in the default package).
Make sure to call the bean class constructor using the new keyword. SELECT new com.path.to.MyBean(...) will work, whereas SELECT com.path.to.MyBean(...) will not.
Make sure to pass attributes in exactly the same order as that expected in the bean constructor. Attempting to pass attributes in a different order will lead to an exception.
Make sure the query is a valid JPA query, that is, it is not a native query. #Query("SELECT ..."), or #Query(value = "SELECT ..."), or #Query(value = "SELECT ...", nativeQuery = false) will work, whereas #Query(value = "SELECT ...", nativeQuery = true) will not work. This is because native queries are passed without modifications to the JPA provider, and are executed against the underlying RDBMS as such. Since new and com.path.to.MyBean are not valid SQL keywords, the RDBMS then throws an exception.
Solution for native queries
As noted above, the new ... syntax is a JPA-supported mechanism and works with all JPA providers. However, if the query itself is not a JPA query, that is, it is a native query, the new ... syntax will not work as the query is passed on directly to the underlying RDBMS, which does not understand the new keyword since it is not part of the SQL standard.
In situations like these, bean classes need to be replaced with Spring Data Projection interfaces.
Step 1: Declare a projection interface
package com.path.to;
public interface SurveyAnswerStatistics {
String getAnswer();
int getCnt();
}
Step 2: Return projected properties from the query
public interface SurveyRepository extends CrudRepository<Survey, Long> {
#Query(nativeQuery = true, value =
"SELECT " +
" v.answer AS answer, COUNT(v) AS cnt " +
"FROM " +
" Survey v " +
"GROUP BY " +
" v.answer")
List<SurveyAnswerStatistics> findSurveyCount();
}
Use the SQL AS keyword to map result fields to projection properties for unambiguous mapping.
This SQL query return List< Object[] > would.
You can do it this way:
#RestController
#RequestMapping("/survey")
public class SurveyController {
#Autowired
private SurveyRepository surveyRepository;
#RequestMapping(value = "/find", method = RequestMethod.GET)
public Map<Long,String> findSurvey(){
List<Object[]> result = surveyRepository.findSurveyCount();
Map<Long,String> map = null;
if(result != null && !result.isEmpty()){
map = new HashMap<Long,String>();
for (Object[] object : result) {
map.put(((Long)object[0]),object[1]);
}
}
return map;
}
}
I know this is an old question and it has already been answered, but here's another approach:
#Query("select new map(count(v) as cnt, v.answer) from Survey v group by v.answer")
public List<?> findSurveyCount();
define a custom pojo class say sureveyQueryAnalytics and store the query returned value in your custom pojo class
#Query(value = "select new com.xxx.xxx.class.SureveyQueryAnalytics(s.answer, count(sv)) from Survey s group by s.answer")
List<SureveyQueryAnalytics> calculateSurveyCount();
I do not like java type names in query strings and handle it with a specific constructor.
Spring JPA implicitly calls constructor with query result in HashMap parameter:
#Getter
public class SurveyAnswerStatistics {
public static final String PROP_ANSWER = "answer";
public static final String PROP_CNT = "cnt";
private String answer;
private Long cnt;
public SurveyAnswerStatistics(HashMap<String, Object> values) {
this.answer = (String) values.get(PROP_ANSWER);
this.count = (Long) values.get(PROP_CNT);
}
}
#Query("SELECT v.answer as "+PROP_ANSWER+", count(v) as "+PROP_CNT+" FROM Survey v GROUP BY v.answer")
List<SurveyAnswerStatistics> findSurveyCount();
Code needs Lombok for resolving #Getter
#Repository
public interface ExpenseRepo extends JpaRepository<Expense,Long> {
List<Expense> findByCategoryId(Long categoryId);
#Query(value = "select category.name,SUM(expense.amount) from expense JOIN category ON expense.category_id=category.id GROUP BY expense.category_id",nativeQuery = true)
List<?> getAmountByCategory();
}
The above code worked for me.
I used custom DTO (interface) to map a native query to - the most flexible approach and refactoring-safe.
The problem I had with this - that surprisingly, the order of fields in the interface and the columns in the query matters. I got it working by ordering interface getters alphabetically and then ordering the columns in the query the same way.
I just solved this problem :
Class-based Projections doesn't work with query native(#Query(value = "SELECT ...", nativeQuery = true)) so I recommend to define custom DTO using interface .
Before using DTO should verify the query syntatically correct or not
Get data with column name and its values (in key-value pair) using JDBC:
/*Template class with a basic set of JDBC operations, allowing the use
of named parameters rather than traditional '?' placeholders.
This class delegates to a wrapped {#link #getJdbcOperations() JdbcTemplate}
once the substitution from named parameters to JDBC style '?' placeholders is
done at execution time. It also allows for expanding a {#link java.util.List}
of values to the appropriate number of placeholders.
The underlying {#link org.springframework.jdbc.core.JdbcTemplate} is
exposed to allow for convenient access to the traditional
{#link org.springframework.jdbc.core.JdbcTemplate} methods.*/
#Autowired
protected NamedParameterJdbcTemplate jdbc;
#GetMapping("/showDataUsingQuery/{Query}")
public List<Map<String,Object>> ShowColumNameAndValue(#PathVariable("Query")String Query) throws SQLException {
/* MapSqlParameterSource class is intended for passing in a simple Map of parameter values
to the methods of the {#link NamedParameterJdbcTemplate} class*/
MapSqlParameterSource msp = new MapSqlParameterSource();
// this query used for show column name and columnvalues....
List<Map<String,Object>> css = jdbc.queryForList(Query,msp);
return css;
}
//in Service
`
public List<DevicesPerCustomer> findDevicesPerCustomer() {
LOGGER.info(TAG_NAME + " :: inside findDevicesPerCustomer : ");
List<Object[]> list = iDeviceRegistrationRepo.findDevicesPerCustomer();
List<DevicesPerCustomer> out = new ArrayList<>();
if (list != null && !list.isEmpty()) {
DevicesPerCustomer mDevicesPerCustomer = null;
for (Object[] object : list) {
mDevicesPerCustomer = new DevicesPerCustomer();
mDevicesPerCustomer.setCustomerId(object[0].toString());
mDevicesPerCustomer.setCount(Integer.parseInt(object[1].toString()));
out.add(mDevicesPerCustomer);
}
}
return out;
}`
//In Repo
` #Query(value = "SELECT d.customerId,count(*) FROM senseer.DEVICE_REGISTRATION d where d.customerId is not null group by d.customerId", nativeQuery=true)
List<Object[]> findDevicesPerCustomer();`
I am working on ASP.NET MVC4.0.
My string is posting like this from view :-
[{"name":"AddressNumber","value":"1"},{"name":"OrganizationProd","value":""},{"name":"ClientId","value":""},{"name":"ProductId","value":""},{"name":"TaxId1","value":""},{"name":"TaxId2","value":""},{"name":"LaborID","value":"0"}]
And below is my controller's action method for that,which is receiving the input :-
[AllowAnonymous]
[HttpPost]
public ActionResult UpdateProducts(string ModelString){
}
And below is the string which i am getting in action(in ModelString variable):-
[{"name":"AddressNumber","value":"1"},{"name":"OrganizationProd","value":""},{"name":"ClientId","value":""},{"name":"ProductId","value":""},{"name":"TaxId1","value":""},{"name":"TaxId2","value":""},{"name":"LaborID","value":"0"}]
And after that i am deserializing the string like that :-
var sear = new JavaScriptSerializer();
var dictDynamic = sear.Deserialize<dynamic>(ModelString);
And i am getting the dynamic array in dictDynamic variable.And now i want to get the properties by its name not by indexing from dictDynamic object.
Currently i am getting the properties by indexing like this :-
dictDynamic[0]["value"]
dictDynamic[1]["value"]
But i want to parse it by properties name like this :-
dictDynamic["Name"]["value"]
dictDynamic["Description"]["value"]
Can anyone help me out on this ?
You could use ViewModel on server side, not sending model string.
You create ViewModel like this:
class ProductViewModel {
public int AddressNumber { get; set; }
public int ProductId { get; set; }
...
}
Then change your controller method:
[AllowAnonymous]
[HttpPost]
public ActionResult UpdateProducts(ProductViewModel vm){
...
}
And from your View you'll send json object like this:
{
"AddressNumber":"10",
"OrganizationProd":"1",
"ClientId":"1",
"ProductId":"1",
"TaxId1":"23",
"TaxId2":"23",
"LaborID":"10"
}
This will automaticaly bind your values from View to ViewModel on controller, and you can than use ViewModel object in your code, and you then have strongly typed entity.
Instead of this:
dictDynamic["AddressNumber"]
dictDynamic["OrganizationProd"]
now you can write this:
vm.AddressNumber
vm.OrganizationProd
You need to pass a JavaScript object to your function instead of an array. Array is not the correct data structure to use in this case. Objects have keys and values. The keys will be AddressNumber, OrganizationProd, ClientId, ProductId, TaxId1 etc. Their values will be 1, "", "0" etc.
For instance, for your example, this will be your object:
{
"AddressNumber":1,
"OrganizationProd":"",
"ClientId":"",
"ProductId":"",
"TaxId1":"",
"TaxId2":"",
"LaborID":0
}
You deserialize it like you do now:
var s = "{\"AddressNumber\":1, \"OrganizationProd\":\"\", \"ClientId\":\"\", \"ProductId\":\"\", \"TaxId1\":\"\", \"TaxId2\":\"\", \"LaborID\":0}";
var sear = new JavaScriptSerializer();
var dictDynamic = sear.Deserialize<dynamic>(s);
Once you deserialize, you will be able to reference the values like this:
dictDynamic["AddressNumber"]
dictDynamic["OrganizationProd"]
I'm trying to understand how to use the CreateProxy() feature of Likeness<T>() using two instances of a simple class.
public class Band
{
public string Strings { get; set; }
public string Brass { get; set; }
}
With the following test, I use a Fixture to Create<T> a Band instance with values for the two string properties.
[Fact]
public void Equality_Behaves_As_Expected()
{
// arrange
var fixture = new Fixture();
fixture.Customize(new AutoMoqCustomization());
var original = fixture.Create<Band>();
// Brass something like --> "Brass65756b89-d9f3-42f8-88fc-ab6de5ae65cd"
// Strings something like --> "Strings7439fa1b-014d-4544-8428-baea66858940"
// act
var dupe = new Band {Brass = original.Brass,
Strings = original.Strings};
// Brass same as original's like --> "Brass65756b89-d9f3-42f8-88fc-ab6de5ae65cd"
// Strings same as original's like --> "Strings7439fa1b-014d-4544-8428-baea66858940"
I've tried many different assertions, but the crux of the matter seems to be that the CreateProxy method is not populating the properties of Band, so that even when I try to compare two instances of Band with the same property values, the instance from the CreateProxy method always has null values.
// assert
var likeness = dupe.AsSource().OfLikeness<Band>()
.Without(x => x.Brass).CreateProxy();
// Brass & String properties are null using dupe as source of likeness (!)
//var likeness = original.AsSource().OfLikeness<Band>()
// .Without(x => x.Brass).CreateProxy();
// Brass & String properties are null using original as source of likeness (!)
//Assert.True(likeness.Equals(original)); // Fails
//Assert.True(original.Equals(likeness)); // Fails
// below are using FluentAssertions assembly
//likeness.Should().Be(original); // Fails (null properties)
//original.Should().Be(likeness); // Fails (null properties)
//likeness.ShouldBeEquivalentTo(original); // Fails (null properties)
//original.ShouldBeEquivalentTo(likeness); // Fails (null properties)
}
I've gotta be doing something wrong, but I've read everything I can find on the Ploeh blog and SO, and can't find an example suitably simple enough to compare to what I'm doing. Any ideas?
If you assign the values on the proxied instance (after calling the CreateProxy method) the test passes:
[Fact]
public void Equality_Behaves_As_Expected()
{
// AutoMoqCustomization is not necessary.
var original = new Fixture().Create<Band>();
var likeness = original
.AsSource()
.OfLikeness<Band>()
.Without(x => x.Brass)
.CreateProxy();
likeness.Brass = "foo"; // Ignored.
likeness.Strings = original.Strings;
Assert.True(likeness.Equals(original));
likeness.Should().Be(original);
likeness.ShouldBeEquivalentTo(original);
}
Keep in mind that Likeness creates a proxy on the target type and only that type's instance overrides Equals.
Since the source type remains intact, the following assertions will not succeed:
Assert.True(original.Equals(likeness));
original.Should().Be(likeness);
original.ShouldBeEquivalentTo(likeness);
Update
From version 3.0.4 and above the values are automatically copied to the proxy instance (which means, likeness.Strings = original.Strings; is going to happen automatically).
I'm getting an exception after I added this embedded field in my entity:
#Entity
public class Team extends DataObject
{
#Embedded
private TeamEvolution teamEvolution = new TeamEvolution();
// NEW FIELD:
#Embedded
// #AttributeOverrides({ #AttributeOverride(name = "buffer", column = #Column) })
// #Enumerated
private ScoutBuffer scoutBuffer;
...
This guy is very simple:
#Embeddable
public class ScoutBuffer
{
private static final int BUFFER_SIZE = 150;
#Basic
private List<String> buffer;
... // from here on there are only methods...
When I try to merge my modifications I get the following exception:
java.lang.IllegalArgumentException: out of field index :-1
at com.olympya.futweb.datamodel.model.ScoutBuffer.jdoProvideField(ScoutBuffer.java)
at org.datanucleus.state.JDOStateManagerImpl.provideField(JDOStateManagerImpl.java:2585)
at org.datanucleus.state.JDOStateManagerImpl.provideField(JDOStateManagerImpl.java:2555)
at org.datanucleus.store.mapped.mapping.CollectionMapping.postUpdate(CollectionMapping.java:185)
at org.datanucleus.store.mapped.mapping.EmbeddedPCMapping.postUpdate(EmbeddedPCMapping.java:133)
// etc, etc...
I don't think there's anything to do, but I had to use JDOHelper.makeDirty before merging the entity for it to perceive that I modified scoutBuffer:
team.getScoutBuffer().add(playerIds);
JDOHelper.makeDirty(team, "scoutBuffer");
em.merge(team);
As you can see commented in the code, I tried the workaround described here, without success. Strange thing is that is from 2009... I'm using GAE 1.7.0, by the way. Also, I tried cleaning/re-enhancing the datamodel.
Using Windows forms and linq to Sql, I bound a datagridview to Products Table, I added to the form 1 Textbox to input the searched text.
I wonder how to position the datagridview according to the text entered to find a given ProductName.
Here I do not want to filter rows, I only want to reposition datagrid after each character entered, the used code:
private void textBox1_TextChanged(object sender, EventArgs e)
{
var searchValue = textBox1.Text.Trim().ToUpper();
var qry = (from p in dc.Products
where p.ProductName.ToUpper().StartsWith(searchValue)
select p).ToList();
int itemFound = productBindingSource.Find("ProductName", searchValue);
productBindingSource.Position = itemFound;
}
The execution of code give the next error: System.NotSupportedException was unhandled at the ligne:
int itemFound = productBindingSource.Find("ProductName", searchValue);
Any idea please ?
The MSDN documentation for BindingSource has the answer:
The Find method can only be used when the underlying list is an
IBindingList with searching implemented. This method simply refers the
request to the underlying list's IBindingList.Find method. For
example, if the underlying data source is a DataSet, DataTable, or
DataView, this method converts propertyName to a PropertyDescriptor
and calls the IBindingList.Find method. The behavior of Find, such as
the value returned if no matching item is found, depends on the
implementation of the method in the underlying list.
When you call this method on a BindingSource whose underlying data source does not implement IBindingList then you see the exception (thrown by the default implementation of IBindingList.FindCore:
System.NotSupportedException: The specified method is not supported.
You don't show what you bind the binding source to but clearly it doesn't implement this method.
Annoyingly, BindingList<T> the recommended list type to use for your data source does not provide a FindCore implementation.
If you are using BindingList you will need to create your own custom type. Here is the code for an absolutely bare bones implementation of a BindingList that supports find:
public class FindableBindingList<T> : BindingList<T>
{
public FindableBindingList()
: base()
{
}
public FindableBindingList(List<T> list)
: base(list)
{
}
protected override int FindCore(PropertyDescriptor property, object key)
{
for (int i = 0; i < Count; i++)
{
T item = this[i];
if (property.GetValue(item).Equals(key))
{
return i;
}
}
return -1; // Not found
}
}
You can do lots with your own implementations of BindingList such as supporting sorting. I've left my answer as just the minimum to support the find method. Search for SortableBindingList if you want to know more.
To use this class do something like this:
var qry = (from p in dc.Products
where p.ProductName.ToUpper().StartsWith(searchValue)
select p).ToList();
FindableBindingList<YourType> list = new FindableBindingList<YourType>(qry);
dataGridView1.DataSource = list;