Consider a stored procedure GetEmployees which has a SELECT statement like
SELECT EMP_ID, EMP_NAME, EMP_EMAIL
FROM EMPLOYEE
This stored procedure will have its results mapped to a complex type GetEmployees_Result
class GetEmployees_Result {
public int EMP_ID;
public string EMP_NAME;
public string EMP_EMAIL;
}
Is it possible to map the result of the function import to a different complex type like the one below:
class GetEmployeesResult {
public int Id;
public string Name;
public string Email;
}
It is a standard feature. You have go to the mapping of the function import and change the result type to the custom type.
Related
I am trying to do an aggregation with Esper 8.8.0 EPL using the following code. When ProductEvent is published then I am trying to save it into a table after converting the complete ProductEvent bean object into json. Is there any way I can pass ProductEven Object itself in custom function when executing merge statement -
#public create table OutputTable
(
productId string primary key
, productName string
, productJson string
);
#name('stmtUpdateOutputTable') on ProductEvent pe
merge OutputTable ot
where ot.productId = pe.productId
when not matched
then insert select productId, productName, Utils.getJson(*)
when matched
then update
set
ot.productName= pe.productName,
ot.productJson = Utils.getJson(*)
;
ProductEvent is a java bean that contains more than 100 property so it is not a good idea I pass each individual field when call custom function -
public class ProductEvent{
private String productId;
private String productName;
private Double price;
private LocalDate firstAvailableDate;
//..... around 100 more properties here
}
Utils is a helper class that contains static method -
public static String getJson(ProductEvent event) {
return new ObjectMapper().writeValueAsString(event);
}
In the on-merge, there are two aliases: "pe" for ProductEvent and "ot" for OutputTable, so "...Utils.getJson(pe)..." would work.
I have an array field in my first entity Class as below:
class Entity1{
private Integer col1;
private String col2;
private Integer[] col3Arr;
}
I have another entity class as below:
class Entity2{
private Integer col1;
private String col2;
private Integer col3;
}
I am fetching records by joining multiple other entities along with which I have to join Entity1 if col3Arr contains a value col3 from Entity 2
With PSQL, I could easily achieve this by following statement
//Other part of query
join Entity2 e2 on (//conditions from other joined tables//)
join Entity1 e1 on e2.col3=ANY(e1.col3Arr)
What is the HQL equivalent of ANY?
Or is there any other way in HQL to check if an array contains a specific value?
For mapping the arrays you will need a custom type. You can use the hibernate-types project for this: https://vladmihalcea.com/how-to-map-java-and-sql-arrays-with-jpa-and-hibernate/
Did you try to use e2.col3 = FUNCTION('ANY', e1.col3Arr) yet? If that doesn't work, I would suggest you create a custom SQLFunction that renders the SQL you desire e.g.
public class ArrayAny implements SQLFunction {
#Override
public boolean hasArguments() {
return true;
}
#Override
public boolean hasParenthesesIfNoArguments() {
return true;
}
#Override
public Type getReturnType(Type firstArgumentType, Mapping mapping) throws QueryException {
return firstArgumentType;
}
#Override
public String render(Type firstArgumentType, List args, SessionFactoryImplementor factory) throws QueryException {
return "any(" + args.get(0) + ")";
}
}
You will have to register the function within the Dialect.
According to the hibernate documentation:
When discussing arrays, it is important to understand the distinction between SQL array types and Java arrays that are mapped as part of the application’s domain model.
Not all databases implement the SQL-99 ARRAY type and, for this reason, Hibernate doesn’t support native database array types.
So, there is no equivalent of PSQL ANY in HQL.
I have a user defined class CostMatrix this class contains two properties and data type for both properties is HashMap. I am using Morphia to communicate with mongodb so my entity class looks like this
#Entity(value = "CostMatrix",noClassnameStored = false)
public class CostMatrix {
#Id
private String id;
private HashMap<String,Double> distances;
private HashMap<String,Double> durations;
public CostMatrix(){}
public CostMatrix(String id, HashMap<String,Double>distances, HashMap<String,Double>durations) {
this.id = id;
this.distances = distances;
this.durations = durations;
}
I am unable to store object properly into database object is stored any how but when I retrieve its just returns id and class name any thoughts would be appreciated.
if you don't want to have any class/package names in your collection just put the noClassnameStored flag to true.
#Entity(value = "CostMatrix",noClassnameStored =**true**)
As for the saving part, do you fill some values into your maps? The mapper will ignore null values and empty lists.
I am working with Spring MongoDb.
I create various entities using insert method:
http://docs.spring.io/spring-data/mongodb/docs/current/api/org/springframework/data/mongodb/core/MongoOperations.html#insert-java.lang.Object-
However, all methods return void. I need to return the ObjectId of the inserted document.
What is the best way to get it?
This is pretty interesting and thought I would share. I just figured out the solution for this with the help of BatScream comment above:
You would create an object and insert it into your MongoDB:
Animal animal = new Animal();
animal.setName(name);
animal.setCat(cat);
mongoTemplate.insert(animal);
Your animal class looks like this with getters and settings for all fields:
public class Animal {
#Id
#JsonProperty
private String id;
#JsonProperty
private String name;
#JsonProperty
private String cat;
public String getId() {
return id;
}
}
AFTER you have done the insert under mongoTemplate.insert(animal);, you can actually call the method animal.getId() and it will return back the ObjectId that was created.
I had the same problem with #AlanH that animal.getId() is null. And then I just realized my id field had been set as a final field with a wither method. So of course getId() is null since the id field is immutable and the wither method returns a new object with id.
if this is the case: use animal = template.insert(animal).
Consider a stored procedure GetEmployees which has a SELECT statement like
SELECT EMP_ID, EMP_NAME, EMP_EMAIL
FROM EMPLOYEE
This stored procedure will have its results mapped to a complex type GetEmployees_Result
class GetEmployees_Result {
public int EMP_ID;
public string EMP_NAME;
public string EMP_EMAIL;
}
Is it possible to map the result of the function import to a different complex type like the one below:
class GetEmployeesResult {
public int Id;
public string Name;
public string Email;
}
It is a standard feature. You have go to the mapping of the function import and change the result type to the custom type.