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JPA map view with no primary key to an entity


JPA map view with no primary key to an entity

By : Ole Harland
Date : November 18 2020, 03:01 PM
should help you out JPA Specification says that an Entity class must have a unique, immutable ID.
Logically, if it does not have any primary key, it can't be called entity. What you can do instead is create a POJO representation of your VIEW, then execute a SQL Native query, then map the result set to your POJO. Here's a sample using @SqlResultSetMapping/@ConstructorResult http://www.thoughts-on-java.org/result-set-mapping-constructor-result-mappings/
code :


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Creating an ADO.NET Entity from primary key-less view (or stored procedure)

Creating an ADO.NET Entity from primary key-less view (or stored procedure)


By : Ashok Ralhan - Study
Date : March 29 2020, 07:55 AM
I wish this help you I'm not sure I understand why you can't have a column that could act as a primary key. I just ran a similar query against one of my cubes filtered to a list of members and each column name contained the member name. Here is an example:
Submission:
code :
 SELECT Measures.members ON ROWS,
 Customer.[CustomerIdKeyField].[UniqueCustomerId] ON COLUMNS
 FROM [Postage Prints]
(colum header)  [Measures].[MeasuresLevel].[MEMBER_CAPTION] [Customer].[CustomerIdKeyField].&[UniqueCustomerId]

(row) Measure1  9.6800000000000015

(row) Measure2  22

(row) Measure3  1
Entity Framework 4.0, adding SQL Server view which contains no primary key

Entity Framework 4.0, adding SQL Server view which contains no primary key


By : Gustavo Iván López C
Date : March 29 2020, 07:55 AM
seems to work fine I found a perfect answer from the Entity Framework and Sql Server view question. According to the answer given to that question the above SQL Query (view without primary key) has to be changed like following.
code :
create view viewGetMember as 
select distinct
isnull(member.Membership_Number,-1) Number,
dvt.Default_Name ParticipationStatus,
person.Given_Name GivenName,
person.Last_Name LastName,
adrs.House_Number HouseNumber,
adrs.Street Street,
adrs.Post_Code PostCode,
email.Email_Address EmailAddress
from Participation member
inner join Party_Participation pp on member.Participation_Id = pp.Participation_Id
inner join Party party on pp.Party_Id = party.Party_Id
inner join Individual person on party.Party_Id = person.Party_Id
inner join Domain_Value_t9n dvt on member.Participation_Status = dvt.Domain_Value_Id
inner join Communication_Point cpadrs on party.Party_Id = cpadrs.Party_Id 
and cpadrs.Communication_Point_Type in 
(select dv.Domain_Value_Id from Domain_Value dv where dv.Short_Code = 'ADDRESS') 
inner join Communication_Point cpemail on party.Party_Id = cpemail.Party_Id 
and cpemail.Communication_Point_Type in 
(select dv.Domain_Value_Id from Domain_Value dv where dv.Short_Code = 'EMAIL') 
inner join Address adrs on cpadrs.Communication_Point_Id = adrs.Communication_Point_Id
inner join Email email on cpemail.Communication_Point_Id = email.Communication_Point_Id and cpemail.Is_Preferred = 1
where 
member.Membership_Number is not null
go
select * from viewGetMember
go
Using a view with no primary key with Entity

Using a view with no primary key with Entity


By : Jo Nls
Date : March 29 2020, 07:55 AM
it helps some times
Is it at all possible to add a view to the Entity model without a unique identifier?
code :
Country     Year TotalSales
Philippines 2010 20.000000
Philippines 2011 40.000000
public class SalesOnEachCountry
{        
    [Key]
    public int CountryId { get; set; }
    public string CountryName { get; set; }        
    public int OrYear { get; set; }
    public long SalesCount { get; set; }
    public decimal TotalSales { get; set; }
}
Country     Year TotalSales
Philippines 2010 20.000000
Philippines 2010 20.000000
public class SalesOnEachCountry
{        
    [Key, Column(Order=0)] public int CountryId { get; set; }
    public string CountryName { get; set; }
    [Key, Column(Order=1)] public int OrYear { get; set; }

    public long SalesCount { get; set; }      
    public decimal TotalSales { get; set; }
}
Country     Year TotalSales
Philippines 2010 20.000000
Philippines 2011 40.000000
create view RowNumberedView as

select 
    row_number() over(order by <columns of your view sorting>) as RN
    , *
from your_existing_view
Entity Framework: View exclusion without primary key

Entity Framework: View exclusion without primary key


By : nattira
Date : March 29 2020, 07:55 AM
I wish this help you As already discussed in the comments you can try adding MAX(id) as id to the view. Based on your feedback this would become:
code :
SELECT ISNULL(MAX(id), 0) as ID, 
       SUM(col1), 
       col2, 
       col3 
FROM   Table1 
GROUP BY col2, col3
CREATE UNIQUE CLUSTERED INDEX idx_view1 ON dbo.View1(id)
Mapping a SQL View with no Primary Key to JPA Entity

Mapping a SQL View with no Primary Key to JPA Entity


By : fer
Date : March 29 2020, 07:55 AM
Any of those help One way to solve this is use a composite primary key by just adding the @Id annotation to the appropriate fields.
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