I have the following model and methods:
[PetaPoco.TableName("TestStep")]
[PetaPoco.PrimaryKey("ID")]
public class TestStep
{
public int ID { get; set; }
public int ParentID { get; set; }
public string Name { get; set; }
public string Details { get; set; }
}
public IEnumerable<TestStep> GetById(int ID)
{
var db = new PetaPoco.Database("TestProcedureDB");
return db.Query<TestStep>(#"SELECT * FROM TESTSTEP TS
INNER JOIN TESTSTEPLINK L ON L.STEPID = TS.ID
WHERE L.TESTID = #0", ID);
}
When the POCO is populated, the ID property value is that of the ID column in the TESTSTEPLINK table. If I change the query to return SELECT TS.* then all is ok. Is this a bug or am I missing something?
PetaPoco will go through all your return columns and map them.
First it will map Id from the table TESTSTEP, then it finds Id again and so it overrides the previously set value.
If you are doing a join like this and only want specific information, you should either only specify the columns you want to return (otherwise you are bringing back more data than needed which is a performance issue)
or do as you did to fix it by using TS.* to ensure only the columns from the first table are mapped.
Related
I have a two table products and categories. When I add a product to products, I get an error. I share the codes.
class Products
{
public int Id { get; set; }
public string Name { get; set; }
public float Price { get; set; }
public string Description { get; set; }
public int CategoryId { get; set; }
public string CategoryName { get; set; }
public Categories Category { get; set; }
}
With this method, I get the products. After I fill a datagridview. But I want to see categoryName instead of CategoryId. It works, I see the categoryName instead of CategoryId in datagridview.
public List<Products> GetProducts()
{
var products = context.Products.Include(x =>x.Category ).Select(m => new Products()
{
Id = m.Id,
Name = m.Name,
Price = m.Price,
Description = m.Description,
CategoryName=m.Category.Name
}).ToList();
return products;
}
After that I have an Add method
public void AddProduct(Products products )
{
context.Products.Add(products);
context.SaveChanges();
}
However, when I try to add a new product, I have an error.
The issue is that Category Name is not in the physical table, just your object. So when EF attempts to generate the SQL, it can't find a column called CategoryName.
Take a look at this question
Exclude Property on Update in Entity Framework
I have a linq query written in the below format. Now when I am passing a consumerID it works fine and I am able to put it in the where clause. However when I try to pass a list of consumerIds, how can I put this in the where clause. I have looked through some solution online and they all use some other linq format which I dont want to use.
Please suggesest if I can have a list in the where clause, something similar to how we can have in clause in sql??
public ICollection<ConsumerExchangeChangeDto> GetByConsumers(List<int> consumerIDs)
{
EnrollmentReportingModel db = (EnrollmentReportingModel)Context.DbContext;
var results = (from ecew in db.A
join ecewe in db.B on ecew.ID
equals ecewe.ExchangeChangeEnrollmentWindowID into temp
from j in temp.DefaultIfEmpty()
join cecr in db.C on ecew.ConsumerExchangeChangeRequestID equals cecr.ID
join con in db.D on cecr.ConsumerID equals con.ID
where con.ID.Contains(consumerIDs) && !ecew.Deleted
select new E
{
ConsumerID = con.ID,
OrganizationID = con.OrganizationID,
StartDate = ecew.StartDate,
EndDate = ecew.EndDate,
Deleted = ecew.Deleted
}).ToList();
return results;
}
Here is the dto class
public class E : ILzDto
{
public int ConsumerID { get; set; }
public int OrganizationID { get; set; }
public DateTime? StartDate { get; set; }
public DateTime? EndDate { get; set; }
public bool Deleted { get; set; }
}
Change this:
where con.ID.Contains(consumerIDs)
to this:
where consumerIDs.Contains(con.ID)
This will check if the id of the items in the select statement are in the input list.
The only examples I can find addressing this sort of scenario are pretty old, and I'm wondering what the best way is to do this with the latest version of ORMLite...
Say I have two tables (simplified):
public class Patient
{
[Alias("PatientId")]
[Autoincrement]
public int Id { get; set; }
public string Name { get; set; }
}
public class Insurance
{
[Alias("InsuranceId")]
[Autoincrement]
public int Id { get; set; }
[ForeignKey(typeof("Patient"))]
public int PatientId { get; set; }
public string Policy { get; set; }
public string Level { get; set; }
}
Patients can have multiple Insurance policies at different "levels" (primary, secondary, etc). I understand the concept of blobbing the insurance information as a Dictionary type object and adding it directly to the [Patient] POCO like this:
public class Patient
{
public Patient() {
this.Insurances = new Dictionary<string, Insurance>(); // "string" would be the Level, could be set as an Enum...
}
[Alias("PatientId")]
[Autoincrement]
public int Id { get; set; }
public string Name { get; set; }
public Dictionary<string, Insurance> Insurances { get; set; }
}
public class Insurance
{
public string Policy { get; set; }
}
...but I need the insurance information to exist in the database as a separate table for use in reporting later.
I know I can join those tables in ORMLite, or create a joined View/Stored Proc in SQL to return the data, but it will obviously return multiple rows for the same Patient.
SELECT Pat.Name, Ins.Policy, Ins.Level
FROM Patient AS Pat JOIN
Insurance AS Ins ON Pat.PatientId = Ins.PatientId
(Result)
"Johnny","ABC123","Primary"
"Johnny","987CBA","Secondary"
How can I map that into a single JSON response object?
I'd like to be able to map a GET request to "/patients/1234" to return a JSON object like:
[{
"PatientId":"1234",
"Name":"Johnny",
"Insurances":[
{"Policy":"ABC123","Level":"Primary"},
{"Policy":"987CBA","Level":"Secondary"}
]
}]
I don't have a lot of hope in this being do-able in a single query. Can it be done in two (one on the Patient table, and a second on the Insurance table)? How would the results of each query be added to the same response object in this nested fashion?
Thanks a ton for any help on this!
Update - 4/29/14
Here's where I'm at...In the "Patient" POCO, I have added the following:
public class Patient
{
[Alias("PatientId")]
[Autoincrement]
public int Id { get; set; }
public string Name { get; set; }
[Ignore]
public List<Insurance> Insurances { get; set; } // ADDED
}
Then, when I want to return a patient with multiple Insurances, I do two queries:
var patientResult = dbConn.Select<Patient>("PatientId = " + request.PatientId);
List<Insurance> insurances = new List<Insurance>();
var insuranceResults = dbConn.Select<Insurance>("PatientId = " + patientResult[0].PatientId);
foreach (patientInsurance pi in insuranceResults)
{
insurances.Add(pi);
}
patientResult[0].Insurances = insurances;
patientResult[0].Message = "Success";
return patientResult;
This works! I get nice JSON with nested items for Insurances while maintaining separate related tables in the db.
What I don't like is that this object cannot be passed back and forth to the database. That is, I can't use the same nested object to automatically insert/update both the Patient and InsurancePolicy tables at the same time. If I remove the "[Ignore]" decorator, I get a field in the Patient table called "Insurances" of type varchar(max). No good, right?
I guess I'm going to need to write some additional code for my PUT/POST methods to extract the "Insurances" node from the JSON, iterate over it, and use each Insurance object to update the database? I'm just hoping I'm not re-inventing the wheel here or doing a ton more work than is necessary.
Comments would still be appreciated! Is Mythz on? :-) Thanks...
An alternate more succinct example:
public void Put(CreatePatient request)
{
var patient = new Patient
{
Name = request.Name,
Insurances = request.Insurances.Map(x =>
new Insurance { Policy = i.Policy, Level = i.Level })
};
db.Save<Patient>(patient, references:true);
}
References are here to save the day!
public class Patient
{
[Alias("PatientId")]
[Autoincrement]
public int Id { get; set; }
public string Name { get; set; }
[Reference]
public List<Insurance> Insurances { get; set; }
}
public class Insurance
{
[Alias("InsuranceId")]
[Autoincrement]
public int Id { get; set; }
[ForeignKey(typeof("Patient"))]
public int PatientId { get; set; }
public string Policy { get; set; }
public string Level { get; set; }
}
I can then take a JSON request with a nested "Insurance" array like this:
{
"Name":"Johnny",
"Insurances":[
{"Policy":"ABC123","Level":"Primary"},
{"Policy":"987CBA","Level":"Secondary"}
]
}
...to create a new record and save it like this:
public bool Put(CreatePatient request)
{
List<Insurance> insurances = new List<Insurance>();
foreach (Insurance i in request.Insurances)
{
insurances.Add(new Insurance
{
Policy = i.Policy,
Level = i.Level
});
}
var patient = new Patient
{
Name = request.Name,
Insurances = insurances
};
db.Save<Patient>(patient, references:true);
return true;
}
Bingo! I get the new Patient record, plus 2 new records in the Insurance table with correct foreign key references back to the PatientId that was just created. This is amazing!
First you should define a foreign collection in Patient class. (with get and set methods)
#ForeignCollectionField
private Collection<Insurance> insurances;
When you query for a patient, you can get its insurances by calling getInsurances method.
To convert all into a single json object with arrays inside you can use a json processor. I use Jackson (https://github.com/FasterXML/jackson) and it works very well. Below will give you json object as a string.
new ObjectMapper().writeValueAsString(patientObject);
To correctly map foreign fields you should define jackson references. In your patient class add a managed reference.
#ForeignCollectionField
#JsonManagedReference("InsurancePatient")
private Collection<Insurance> insurances;
In your insurance class add a back reference.
#JsonBackReference("InsurancePatient")
private Patient patient;
Update:
You can use Jackson to generate objects from json string then iterate and update/create database rows.
objectMapper.readValue(jsonString, Patient.class);
I am new in ASP.NET MVC 4; Using DATABASE FIRST APPROACH. According to my question I am using SQL stored procedure to retrieve data to populate my jQgrid. But it is retrieving all BO tables data except OrgName which is coming from Org table(look in stored procedure). So What I do to get OrgName???
My Stored Procedure is as follows :
ALTER PROCEDURE [dbo].[GetBODetails]
AS
BEGIN
SELECT b.Id, b.OrgId, b.Code, b.Name, o.Name AS OrgName
FROM Org AS o INNER JOIN BO AS b ON o.Id = b.OrgId
END
Columns of BO table :
Id = GUID
Code = NVARCHAR(50)
Name = NVARCHAR(50)
OrgId = Foreign Key ref from Org table Id
Columns of BO table :
Id = GUID
Name = NVARCHAR(50)
Used this Procedure in my MVC project by doing "Add Function Import" from Model Browser window ;by referring this article Click here. While doing this I select Returns a collection of Entities is BO model.
Model generated of BO and Org are as follows :
BO.cs
public partial class BO
{
public System.Guid Id { get; set; }
public string Code { get; set; }
public string Name { get; set; }
public System.Guid OrgId { get; set; }
public virtual Org Org { get; set; }
}
Org.cs
public partial class Org
{
public Org()
{
this.BOes = new HashSet<BO>();
}
public System.Guid Id { get; set; }
public string Name { get; set; }
public virtual ICollection<BO> BOes { get; set; }
}
Controller's code to execute Stored Procedure :
private iregEntities m_oDbCont = new iregEntities();
// GET: /BO/
public JsonResult BOGrid()
{
m_oDbCont.Configuration.ProxyCreationEnabled = false;
var BOList = m_oDbCont.GetBODetails().ToList(); // Executing stored procedure
var JsonBOList = new
{
rows = (
from BOData in BOList
select new
{
id = BOData.Id.ToString(),
cell = new string[] { BOData.OrgId.ToString(), BOData.Code, BOData.Name }
}).ToArray()
};
return Json(JsonBOList, JsonRequestBehavior.AllowGet); returning data into JSON format
}
protected override void Dispose(bool disposing)
{
m_oDbCont.Dispose();
base.Dispose(disposing);
}
While doing the function import, ask to create a new complex type instead of mapping the result to the BO entity. If you map to the BO entity, only this entity will be filled up with data, that's why Org is empty.
When mapping to a complex type, EF will automatically create a new class containing all the columns returned by the SP.
Mapping SP result to a specific entity is useful when the SP is returning that particular entity, it avoids creating useless complex types everytime you import an SP.
I am new to NH.
I have a table in a legacy DB that looks like this:
Id,
CompanyId,
Description,
[LOADS of other columns here]
I would like to return a DISTINCT set of data using NHibernate, selecting only specific columns and using a WHERE statement. The SQL would looks something like this:
SELECT DISTINCT
[table_name].CompanyId,
[table_name].Description
FROM
[table_name]
WHERE
[table_name].CompanyId = 2
Having googled this I came up with:
ProjectionList projections = Projections.ProjectionList();
projections.Add(Projections.Property("CompanyId"), "CompanyId");
projections.Add(Projections.Property("Name"), "SomeName");
var companyDto = session.QueryOver<Company>()
.Where(x => x.CompanyId == 2)
.Select(projections)
.TransformUsing(Transformers.AliasToBean<CompanyDto>())
.List<CompanyDto>();
if (companyDto != null)
Console.WriteLine(string.Format("{0}, {1}", companyDto.CompanyId, companyDto.SomeName));
Where the DTO is:
public class CompanyDto
{
public int CompanyId { get; set; }
public string SomeName { get; set; }
}
And the entity is:
public class Company
{
public virtual int Id { get; private set; }
public virtual int CompanyId { get; set; }
public virtual string Name { get; set; }
}
This does not bring back disinct records. I know that normally I would have to use a different transform (DistinctRootEntity) but I cannot use two transforms. How can I combine all of the things I want, into a single call? It must be possible, its basic SQL ....
I need to:
not use HQL
not bring back all columns for the record
not bring back duplicate rows
there is a Projection for this
var projections = Projections.Distinct(Projections.ProjectionList()
.Add(Projections.Property("CompanyId").As("CompanyId"))
.Add(Projections.Property("Name").As("SomeName"));