Entity Framework 7 Stored Procedure Result to Model

Question

I have a Model which is mapped to the database via EF7. All properties are identical to the mapped columns of the table.

Now I have a Stored Procedure, which returns some Joined Columns but the basis is still the mapped Model.

Here is my model(Entity) which is mapped to Table1 on my database.

public partial class Table1 { public int id { get; set; } public bool Column1{ get; set; } public int Column2 { get; set; } public int Column3 { get; set; } public int Column4 { get; set; } public int Column5 { get; set; } }

My StoredProcedure returns all of these columns and additionally a Column from another table, which contains additional information on this object.

So My StoredProcedure looks like this:

CREATE PROCEDURE Table1_Select
    AS
        BEGIN
            SELECT  Column1,
                    Column2,
                    Column3,
                    Column4,
                    Column5,
                    Table2.JoinedColumn1
            FROM    Table1
            JOIN    Table2 on Table1.ID = Table2.ID_Table1
        END

My Idea was to just add a Property to the Model

public string JoinedColumn1 {get; set;}

This is working for executing the StoredProcedure, but it's not working as soon as I want to get one Entity with

MyContext.Table1.FirstOrDefault(t=>t.id == 1)

this always returns a Server Error 500 in Fiddler whereas the Stored Procedure Execution with "Table1.FromSql("Table1Select")" works fine.

Or do I have to decide whether to use StoredProcedures for my Model OR accessing Entities directly?

Any Best-Practices or solutions for this?

Many thanks in advance. Nicn

Answer 1

尝试这种方式

var results = db.Database.SqlQuery<YourModel>("exec YourSPName [Optional Parameters]").ToList();

Answer 2

I read from a source as a solution use ADO.NET Connection Sample.

Parameters Sample

try
{
            SqlDataAdapter adapt = new SqlDataAdapter("Table1_Select", ConnectionString);
            adapt.SelectCommand.Parameters.AddWithValue("@yourparameters", param);

            adapt.SelectCommand.CommandType = CommandType.StoredProcedure;
            DataTable dt = new DataTable();
            adapt.Fill(dt);
            adapt.Dispose();
            adapt = null;

            return dt;
}
catch(Exception ex)
{
throw ex
}

Don't Parameters Sample ;

try
{
    SqlDataAdapter adapt = new SqlDataAdapter("Table1_Select", ConnectionString);
    adapt.SelectCommand.CommandType = CommandType.StoredProcedure;
    DataTable dt = new DataTable();
    adapt.Fill(dt);
    adapt.Dispose();
    adapt = null;

    return dt;
}
catch (Exception ex)
{
    throw ex;
}

You get table columns set datatable and read dataTable values and set your class datatable values.

Read DataTable Sample :

 DataTable dt = YourGetDataTableFunction(val);
  DataRow dr = dt.Rows[0]; //index is zero
string Column1 = dr["column1"].ToString();
string Column2 =dr["column2"].ToString();

I hope it helps.

Other Question : How to run stored procedures in Entity Framework Core?

Answer 3

the issue is NOT that I cannot get data from storedProcedure. The issue is that due to the storedProcedure, my Model has more properties than columns in database-table. However I'd still like to access model-entities sometimes directly without using stored procedure which is not working as the debugger says "invalid column" for the column that is not in the table but in the stored procedure.

Hope it makes it more clear.

Thanks again in advance.

Nicn

Answer 4

From your recent post,you said that you are using same model and getting error,so i would like to suggest that use [NOTMAPPED] before your pertcular declared entity lets say,

public int Column5 { get; set; } public int Column5 { get; set; } which is only used while you are calling your SP,so write like,

[NotMapped]
public int Column5 { get; set; }