I Want to make Between Query in DBflow, like that:
Select * From MYTABLE where MYTABLE.NO BETWEEN num1 AND num2
But I don't know that how to use between.
I usually used query like that
public Score find(String No) {
return SQLite.select()
.from(Score.class)
.where(Score_Table.No.eq(No))
.querySingle();
}
You can use between condition like this:
public Score find(String No) {
return SQLite.select()
.from(Score.class)
.where(Condition.column(Score_Table.No).between(value1).and(value2))
.querySingle();
}
Related
The user has a form:
checkbox with fields status and priority
submit btn
Objective: Query DB based on these values.
If one of them is null or false, the criteria should be ignored.
Ex: status is checked and priority is not, I want to query only based on status.
The code below will never execute with one of them being false. I also read about Query by Example but could not find a solution.
Null values can indeed be ignored, but need to be previously defined.
I thought about replacing null with something similar to *.
Ex: WHERE c.status = *. It didn't work.
#Query(value = "SELECT * FROM tickets c WHERE c.status = :status AND c.priority= :priority",
nativeQuery = true)
List<Ticket> findByFilter(#Param("status") String status,
#Param("priority") String priority);
Do you have any idea how can I do this?
Thank you
Thank you Simon for pointing me in the right direction.
This was the web page that helped me:
https://dimitr.im/writing-dynamic-queries-with-spring-data-jpa
My situation:
Created a specification class:
public final class DbFilterSpecification {
public static Specification<Ticket> statusContains(String expression) {
return (root, query, builder) -> builder.like(root.get("status"), contains(expression));
}
public static Specification<Ticket> priorityContains(String expression) {
return (root, query, builder) -> builder.like(root.get("priority"), contains(expression));
}
private static String contains(String expression) {
return MessageFormat.format("%{0}%", expression);
}
}
Created a method inside the service layer:
public List<Ticket> findAllWithSpecification(String status, String priority) {
Specification<Ticket> specification = Specification
.where(status == null ? null : DbFilterSpecification.statusContains(status))
.and(priority == null ? null : DbFilterSpecification.priorityContains(priority));
return ticketRepository.findAll(specification);
}
I have a table (or entity) named Cases. There is another table CaseStatus_Lookup and the primary key of this table is a foreign key in the Cases table.
What I want to do is: For every status type I want the number of count of cases. For e.g. if status = in progress , I want to know how many cases are in that status.
one other thing: I also want to filter the Cases based on UserID.
I tried several ways in LINQ but could not get vary far. I was wondering if someone could help.
try Linq .GroupBy
am assuming your entity structure
suppose your Case Entity is like
public class Case
{
public int Id{get;set;}
public int CaseStatusId{get;set;}
public int UserId{get;set;}
//navigational fields
public virtual CaseStatus CaseStatus {get;set;}
}
and suppose your CaseStatus entity is like:
public class CaseStatus
{
public int Id{get;set;}
public string Name{get;set;}
//navigational fields..
public virtual ICollection<Case> Cases{get;set;}
}
then you can do this:
using (myDbContext db = new myDbContext())
{
var query = db.Cases.GroupBy(case => case.CaseStatus.Name)
.Select(group =>
new {
Name = group.Key,
Cases= group.OrderBy(x => x.Id),
Count= group.Count()
}
).ToList();
//query will give you count of cases grouped by CaseStatus.
}
similarly you can further filter your result based on userId.
Start to explore about Linq .GroupBy
You need a function that returns the sum and takes the status as parameter :- something like below.
MyCaseStatusEnum caseStatus; //Pass your required status
int caseCount = myCases
.Where(r => r.Status == caseStatus)
.GroupBy(p => p.Status)
.Select(q => q.Count()).FirstOrDefault<int>();
I am trying to perform a summation SQL query like the following:
select group_ID, sum(case when user_type = 'Exec' then 1000
when user_type = 'Office' then 10 else 0 end)
from subscription
group by group_ID;
using the following snippet from a hiberate CriteriaBuilder query:
criteriaBuilder.sum(
criteriaBuilder.selectCase()
.when(criteriaBuilder.equal(subscriptionJoin.get(Subscription_.userType), "Exec"),1000)
.when(criteriaBuilder.equal(subscriptionJoin.get(Subscription_.userType), "Office"),1)
.otherwise(101))
However the following compile error appears:
Inferred type 'java.lang.object' for type parameter 'N' is not within its bound; should extend 'java.lang.number'
Any idea how to support performing a summation using the selectCase?
Sum is defined as follows:
<N extends Number> Expression<N> sum(Expression<N> x);
So reason to the compilation error is that sum method expect such arguments which is Expression with type that extends Number. It determines type from the selectCase and ends up with java.lang.Object, which is not acceptable.
Problem can be solved by giving type parameter (<Number>):
criteriaBuilder.sum(
criteriaBuilder.<Number>selectCase()
We are using Spring Data JPA in our project and i have the same case where i need to do sum. Instead of criteria query i'm just following the "named parameters" approach because this approach seems easy.
My method which gives me sum is as follows.
public interface ITransactionEntryRepo extends PagingAndSortingRepository<TransactionEntryEntity, String> {
#Query("select SUM(CASE WHEN te.debit = 'Y' THEN (te.amount * - 1) WHEN te.debit = 'N' THEN te.amount ELSE 0 END) AS availablebalance FROM TransactionEntity t, TransactionEntryEntity te WHERE t.id = te.transactionEntity.id and te.accountEntity.id = :id and te.valid = 'T' and t.retcode = 'XX' GROUP BY te.accountEntity.id")
public double findAvailableBalance(#Param("id") String id);
}
And I call this method in the class where i need
double balance = iTransactionEntryRepo.findAvailableBalance(accountEntity.getId());
and pass it(balance) wherever I need to. Hope this helps someone.
For aggregate operation you should pass the CriteriaQuery with numeric type to be proper expression for criteria builder, however this may not affect your criteria base restriction of you entity type. Finally you can append the desired predicates to your criteria query for having criteria base aggregation.
public class Aggregate<T, S extends Number> {
public Aggregate(Class<T> tableType, Class<S> type) {
this.criteriaBuilder = entityManager.getCriteriaBuilder();
this.criteria = criteriaBuilder.createQuery(type);
this.root = criteria.from(tableType);
}
public Aggregate<T, S> aggregate(String field) {
criteria.select(criteriaBuilder.sum(root.get(field)));
return this;
}
public <I> Aggregate<T, S> restrict(String field, I i) {
criteria.where(criteriaBuilder.equal(root.get(field), i));
return this;
}
public S perform() {
return entityManager.createQuery(criteria).getSingleResult();
}
private Root<T> root;
private final CriteriaQuery<S> criteria;
private final CriteriaBuilder criteriaBuilder;
}
In Dynamics Ax 2009, we want a field that will be calculated based off another field in the same table.
Although it might be nice to use a display method or something, we have to actually store the value (management is scared of dynamic calculations because the previous product used them and was slow (like anything in AX is fast!)).
To put the icing on the cake, they want it to work two-way:
If we have FieldA, calculate and store FieldB.
If we have FieldB, calculate and store FieldA.
If we have both or none, do nothing.
Is there anything built into Dynamics AX that can help me?
First, override table's method insert(), e.g.:
public void insert()
{
;
this.FieldB = this.FieldA * 2;
super();
}
Then override update(), e.g.:
public void update()
{
if (this.FieldA == this.orig().FieldA && this.FieldB != this.orig().FieldB)
{
this.FieldA = this.FieldB / 2;
}
else
{
this.FieldB = this.FieldA * 2;
}
super();
}
These are only examples, use your own judgement how the methods should be overridden. Lastly, override modifiedField(), which will be used only when the fields are modified manually in forms:
public void modifiedField(fieldId _fieldId)
{
;
super(_fieldId);
switch (_fieldId)
{
case fieldnum(MyTable, FieldA) :
this.FieldB = this.FieldA * 2;
break;
case fieldnum(MyTable, FieldB) :
this.FieldA = this.FieldB / 2;
break;
}
if (this.isFormDataSource())
this.dataSource().refresh();
}
P.S. Keep in mind that insert() and update() are not called when you are using doinsert(), doupdate(), or skipDataMethods().
See another related answer here:
Automatic field values changed according to master table field modified In Axapta
Suppose following codes:
IEnumerable<MyClass> MakeQuery()
{
var query = from m in session.Linq<MyClass>()
select m;
return query;
}
List<MyClass> m1()
{
return MakeQuery()
.Skip(10)
.Take(20)
.ToList<MyClass>();
}
List<MyClass> m2()
{
var query = from m in session.Linq<MyClass>()
select m;
return query
.Skip(10)
.Take(20)
.ToList<MyClass>();
}
Supposing all queries are same, it seems that in m1(), Skip and Take does not work. Indeed its like they do not exist all.
Why this happens and how can be fixed?
I'm using linq-to-nhibernate and this methods are used for paging. Thanks.
Why not use IQueryable for the MakeQuery() method?
IQueryable<MyClass> MakeQuery()
{
return session.Linq<MyClass>();
}
Not that the actual query makes a lot of sense. But I'll leave that to you.
But this is also the only difference between m1() and m2()