public List<Customer> getCustomer()
{
using (IDbConnection con=DapperConnection())
{
string sql = "Select * from Customer";
return con.Query<Customer>(sql).Select(x => new { x.Id, x.LastName })
.ToList();
}
}
class Customer
{
public string Id { get; set; }
public string FirstName { get; set; }
public string LastName { get; set;}
}
Does anyone know how to return specific columns using dapper? What I am trying to achieve is to return just the Id and LastName as List so that I can bind them to my controls.
Unsure exactly what you mean but surely you should return the customer object instead of an anonymous type, or at least make a smaller version of the customer object to be used by the controls
public List<Customer> getCustomers()
{
using (IDbConnection con = DapperConnection())
{
string sql = "Select * from Customer";
return con.Query<Customer>(sql).ToList();
}
}
Or if you dont like the overhead of returning the full customer object
public List<CustomerBase> getCustomers()
{
using (IDbConnection con = DapperConnection())
{
string sql = "Select * from Customer";
return con.Query<CustomerBase>(sql).ToList();
}
}
public class CustomerBase
{
public string Id { get; set; }
public string LastName { get; set; }
}
public class Customer: CustomerBase
{
public string FirstName { get; set; }
//Other props...
}
Related
I created a SqlMapper.TypeHandler to map a Customer object into a CreditAccount class as follows:
public class CustomerTypeHandler : SqlMapper.TypeHandler<Customer>
{
public override Customer Parse(object value)
{
throw new NotImplementedException();
}
public override void SetValue(IDbDataParameter parameter, Customer
value)
{
throw new NotImplementedException();
}
}
public class CreditAccount
{
public int AccountId { get; set; }
public Customer Customer{ get; set; }
}
public class Customer
{
public string FirstName { get; set; }
public string LastName { get; set; }
public string MiddleName { get; set; }
}
When I connect to the DB and call a sproc, the CustomerTypeHandler Parse method is never called and my CreditAccount object is populated with the AccountId only. The Customer object is null.
I am calling it as follows:
public async Task<CreditAccount> GetCreditAccount(int accountId)
{
var sql = "MY PROC NAME HERE";
var parameters = new DynamicParameters();
parameters.Add("#AccountId", accountId);
SqlMapper.AddTypeHandler(new CustomerTypeHandler());
using (IDbConnection connection = Connection)
{
connection.Open();
var account = await connection.QueryFirstAsync<CreditAccount>(sql, parameters, commandType: CommandType.StoredProcedure);
return account;
}
}
}
I placed a breakpoint in the Parse method and it is never called.
The database connection works, and I am getting the AccountId.
My environment;
.NET Core 2.2
Dapper 1.50.5
The code is simple enough. I get not exceptions. Any ideas?
A year has passed and now there is no this error in Dapper 2.0.30.
I checked it on jsonb columns in Postgres.
using Dapper;
using Newtonsoft.Json;
using Npgsql;
using System;
using System.Data;
public class CreditAccount
{
public int AccountId { get; set; }
public Customer Customer { get; set; }
}
public class Customer
{
public string FirstName { get; set; }
public string LastName { get; set; }
public string MiddleName { get; set; }
}
public class CustomerJsonObjectTypeHandler : SqlMapper.TypeHandler<Customer>
{
public override void SetValue(IDbDataParameter parameter, Customer value)
{
parameter.Value = (value == null)
? (object)DBNull.Value
: JsonConvert.SerializeObject(value);
parameter.DbType = DbType.String;
}
public override Customer Parse(object value)
{
return JsonConvert.DeserializeObject<Customer>(value.ToString());
}
}
Example using this classes - all work fine.
static void Main(string[] args)
{
using (var connection = GetDefaultConnection())
{
connection.Open();
var customer = new Customer
{
FirstName = "Gaday",
LastName = "Ivanova",
MiddleName = "Petrovich"
};
var jsonData = JsonConvert.SerializeObject(customer);
var strQuery = $"SELECT 10500 as AccountId,'{jsonData}'::jsonb as Customer";
SqlMapper.AddTypeHandler(new CustomerJsonObjectTypeHandler());
try
{
var data = connection.QueryFirst<CreditAccount>(strQuery);
}
catch(Exception ex)
{
Console.WriteLine(ex.Message);
}
}
}
Using basic DAL 2 to grab data from a table that has tabid. Would like to also get the Tab Url through the DNN API. I could join to the Tabs table, but want to work with the api.
Here is my model.
[TableName("My_Products")]
[PrimaryKey("ProductId")]
[Cacheable("My_Products_", CacheItemPriority.Normal, 20)]
public class ProductInfo
{
public ProductInfo()
{
Langs = new List<ProductLangInfo>();
}
public int ProductId { get; set; }
[ReadOnlyColumn]
public string ProductImage { get; set; }
public int LineID { get; set; }
[ReadOnlyColumn]
public string Culture { get; set; }
[ReadOnlyColumn]
public string ProductName { get; set; }
[ReadOnlyColumn]
public string ProductShortDesc { get; set; }
[ReadOnlyColumn]
public int TabId { get; set; }
[ReadOnlyColumn]
public string ProductURL { get; set; } //GET THIS FROM API
[ReadOnlyColumn]
public List<ProductLangInfo> Langs { get; set; }
}
This is my Controller
public IEnumerable<ProductInfo> GetProducts(string language)
{
using (IDataContext ctx = DataContext.Instance())
{
string sqlCmd = ";WITH cte as (SELECT * FROM [ProductsLang] WHERE Culture = #0)" +
" SELECT Products.*,cte.ProductName, cte.ProductShortDesc, cte.TabId" +
" FROM [Products] as Products" +
" INNER JOIN cte ON Products.ProductId = cte.ProductId";
string order = " ORDER BY Products.ProductId DESC";
return ctx.ExecuteQuery<ProductInfo>(CommandType.Text, sqlCmd + order, language);
}
}
I guess my question is where is the best way to pass in the tabid from my query to the DNN API?
This should be fairly straightforward using the NavigateURL method off DotNetNuke.Common.Globals
var url = DotNetNuke.Common.Globals.NavigateURL(TabId);
There are other ways to get URLs in DNN, but that is the easiest way that should respect all the various Providers that can be used to build out a URL
private string _productUrl = '';
public string ProductURL { get return DotnetNuke.Common.Globals.NavigateURL(TabId); }
I got the error Invalid object name 'dbo.Staffs'. but I'm not sure why. I actually deleted and recreated my database with EF because previously I had other errors. But I'm quite sure I recreated it correctly because I've done it in the same way for other programs and it works fine.
.edmx database diagram
Controller
private StaffPortalDBEntities1 db = new StaffPortalDBEntities1();
SqlConnection cnn = new SqlConnection(ConfigurationManager.ConnectionStrings["StaffPortalDBConnectionString"].ConnectionString);
[Authorize]
public ActionResult Index()
{
var userEmail = User.Identity.Name;
var model = db.Staffs.Where(i => i.Email == userEmail).Include("Histories").Include("CurrentApplications").FirstOrDefault();
return View(model);
}
I got the error is for the line var model = db.Staffs.Where(i => i.Email == userEmail).Include("Histories").Include("CurrentApplications").FirstOrDefault();
Generated Staff class
public partial class Staff
{
public Staff()
{
this.Histories = new HashSet<History>();
this.CurrentApplications = new HashSet<CurrentApplication>();
}
public int StaffID { get; set; }
public string Name { get; set; }
public string Email { get; set; }
public Nullable<decimal> AllocatedLeave { get; set; }
public Nullable<int> BalanceLeave { get; set; }
public virtual ICollection<History> Histories { get; set; }
public virtual ICollection<CurrentApplication> CurrentApplications { get; set; }
}
Try this:
var model = db.Staffs.Where(i => i.Email == userEmail).Include(x=>x.Histories).Include(x=>x.CurrentApplications).FirstOrDefault();
I'm trying to figure out how to make an object data source where I can select which columns to display in Visual Studio and all that. Here's what I have so far, but I'm not sure what else I'm supposed to do?
public class ItemData
{
public string ItemName { get; set; }
public string Description { get; set; }
public string Quantity { get; set; }
public string ManuPartNumber { get; set; }
public string ListID { get; set; }
public string VendorRef { get; set; }
public string VendorName { get; set; }
public string EditSequence { get; set; }
public string UPC { get; set; }
}
public class ItemDataSource : IEnumerable<ItemData>
{
private ICollection<ItemData> list;
public ItemDataSource()
{
try
{
list = QBCom.GetItemList();
}
catch (Exception e)
{
list = new List<ItemData>();
}
}
public ItemDataSource(IEnumerable<ItemData> data)
{
list = data.ToList();
}
public IEnumerator<ItemData> GetEnumerator()
{
foreach (var item in list)
{
yield return item;
}
}
System.Collections.IEnumerator System.Collections.IEnumerable.GetEnumerator()
{
return ((IEnumerable<ItemData>)this).GetEnumerator();
}
}
I am not talking about ASP.net, I'm talking about stuff like DataTables and so forth. Just a regular winforms program.
I assume you want to bind to a DataGridView if so I would inherit from BindingSource and set the list to the DataSource. You can then set the datagridview DataSource to the object to view the columns in the visual studio properties window.
public class ItemDataSource : BindingSource
{
private ICollection<ItemData> list;
public ItemDataSource()
{
try
{
list = QBCom.GetItemList();
}
catch (Exception e)
{
list = new List<ItemData>();
}
this.DataSource = list;
}
public ItemDataSource(IEnumerable<ItemData> data)
{
list = data.ToList();
this.DataSource = list;
}
}
I am using Simple Membership and a UserProfile table that maintains UserId and UserName:
public partial class UserProfile
{
public UserProfile()
{
this.webpages_Roles = new List<webpages_Roles>();
}
public int UserId { get; set; }
public string UserName { get; set; }
public virtual ICollection<webpages_Roles> webpages_Roles { get; set; }
}
With Entity Framework I am running the following which is inside my Context:
public partial class UowContext : DbContext
// code to set up DbSets here ...
public DbSet<Content> Contents { get; set; }
private void ApplyRules()
{
var r1 = new Random();
var r2 = new Random();
foreach (var entry in this.ChangeTracker.Entries()
.Where(
e => e.Entity is IAuditableTable &&
(e.State == EntityState.Added) ||
(e.State == EntityState.Modified)))
{
IAuditableTable e = (IAuditableTable)entry.Entity;
if (entry.State == EntityState.Added)
{
e.CreatedBy = // I want to put the integer value of UserId here
e.CreatedDate = DateTime.Now;
}
e.ModifiedBy = // I want to put the integer value of UserId here
e.ModifiedDate = DateTime.Now;
}
}
Here is the schema showing how user information is stored. Note that I store the integer UserId and not the UserName in the tables:
public abstract class AuditableTable : IAuditableTable
{
public virtual byte[] Version { get; set; }
public int CreatedBy { get; set; }
public DateTime CreatedDate { get; set; }
public int ModifiedBy { get; set; }
public DateTime ModifiedDate { get; set; }
}
Here's an example of a controller action that I use:
public HttpResponseMessage PostContent(Content content)
{
try
{
_uow.Contents.Add(content);
_uow.Commit();
var response = Request.CreateResponse<Content>(HttpStatusCode.Created, content);
return response;
}
catch (DbUpdateException ex)
{
return Request.CreateErrorResponse(HttpStatusCode.Conflict, ex);
}
}
I then have:
public class UowBase : IUow, IDisposable
{
public UowBase(IRepositoryProvider repositoryProvider)
{
CreateDbContext();
repositoryProvider.DbContext = DbContext;
RepositoryProvider = repositoryProvider;
}
public IRepository<Content> Contents { get { return GetStandardRepo<Content>(); } }
and:
public class GenericRepository<T> : IRepository<T> where T : class
{
public GenericRepository(DbContext dbContext)
{
if (dbContext == null)
throw new ArgumentNullException("An instance of DbContext is required to use this repository", "context");
DbContext = dbContext;
DbSet = DbContext.Set<T>();
}
public virtual void Add(T entity)
{
DbEntityEntry dbEntityEntry = DbContext.Entry(entity);
if (dbEntityEntry.State != EntityState.Detached)
{
dbEntityEntry.State = EntityState.Added;
}
else
{
DbSet.Add(entity);
}
}
How can I determine the UserId from inside of my Context so I can populate the Id in my tables?
In Code you will have UserName with you through:
HttpContext.Current.User.Identity.Name
you can than query UserProfile table against that Name and get the UserId from there and than assign it to ModifiedBy attribute.
Make sure that you query UserProfile table outside the foreach loop :)