Omarsoft For IT Solutions Using the best Programming Techniques (Java Codes ,C#.NET Codes , ASP.NET Codes ,VB.NET Codes ,Oracle Database Administration, Real Application Cluster , Remote Support, Cloud Services , Networks , SAP ABAP ,Virtualization....
  • الأنظــمــة المكتبية        Windows App Programming
  • أنظــمـةالويــب        Web based systems programming
  • تطبيقات الهواتف الذكية     smartphones programming
  • إدارة قواعــــــد البيــــــــــــــــانات        Database Administration
  • إدارة الشبكـــــــــــــــــــــــــــــــــات        Networks Administration
  • إدارة الســـيــرفرات (ويب - محلية)  Servers Administration
  • إدارة مخـــــــــــــــــازن البيــــــــــــانات     Storage Administration
  •             N Computing & 2X Application services

    Social Icons

Loading...

Dapper



Dapper

What’s Dapper?

Dapper is a simple object mapper for .NET and own the title of King of Micro ORM in terms of speed and is virtually as fast as using a raw ADO.NET data reader. An ORM is an Object Relational Mapper, which is responsible for mapping between database and programming language.
Dapper extend the IDbConnection by providing useful extension methods to query your database.

How Dapper Works?

It is a three step process.
  • Create an IDbConnection object.
  • Write a query to perform CRUD operations.
  • Pass query as a parameter in Execute method.

Installation

Dapper is installed through NuGet: https://www.nuget.org/packages/Dapper
PM> Install-Package Dapper

Requirement

Dapper work with any database provider since there is no DB specific implementation.

Methods

Dapper will extend your IDbConnection interface with multiple methods:
  • Execute
  • Query
  • QueryFirst
  • QueryFirstOrDefault
  • QuerySingle
  • QuerySingleOrDefault
  • QueryMultiple


string sqlInvoices = "SELECT * FROM Invoice;";
string sqlInvoice = "SELECT * FROM Invoice WHERE InvoiceID = @InvoiceID;";
string sp = "EXEC Invoice_Insert";
using (var connection = My.ConnectionFactory())
{
var invoices = connection.Query<Invoice>(sqlInvoices).ToList();
var invoice = connection.QueryFirstOrDefault(sqlInvoice, new {InvoiceID = 1});
var affectedRows = connection.Execute(sp, new { Param1 = "Single_Insert_1" }, commandType: CommandType.StoredProcedure);
}

Parameter

Execute and queries method can use parameters from multiple different ways:
  • Anonymous
  • Dynamic
  • List
  • String


// Anonymous
var affectedRows = connection.Execute(sql,
new {Kind = InvoiceKind.WebInvoice, Code = "Single_Insert_1"},
commandType: CommandType.StoredProcedure);
// Dynamic
DynamicParameters parameter = new DynamicParameters();
parameter.Add("@Kind", InvoiceKind.WebInvoice, DbType.Int32, ParameterDirection.Input);
parameter.Add("@Code", "Many_Insert_0", DbType.String, ParameterDirection.Input);
parameter.Add("@RowCount", dbType: DbType.Int32, direction: ParameterDirection.ReturnValue);
connection.Execute(sql,
new {Kind = InvoiceKind.WebInvoice, Code = "Single_Insert_1"},
commandType: CommandType.StoredProcedure);
// List
connection.Query<Invoice>(sql, new {Kind = new[] {InvoiceKind.StoreInvoice, InvoiceKind.WebInvoice}}).ToList();
// String
connection.Query<Invoice>(sql, new {Code = new DbString {Value = "Invoice_1", IsFixedLength = false, Length = 9, IsAnsi = true}}).ToList();

Result

The result returned by queries method can be mapped to multiple types:
  • Anonymous
  • Strongly Typed
  • Multi-Mapping
  • Multi-Result
  • Multi-Type


string sql = "SELECT * FROM Invoice;";
using (var connection = My.ConnectionFactory())
{
connection.Open();
var anonymousList = connection.Query(sql).ToList();
var invoices = connection.Query<Invoice>(sql).ToList();
}

Utilities

  • Async
  • Buffered
  • Transaction
  • Stored Procedure


// Async
connection.QueryAsync<Invoice>(sql)
// Buffered
connection.Query<Invoice>(sql, buffered: false)
// Transaction
using (var transaction = connection.BeginTransaction())
{
var affectedRows = connection.Execute(sql,
new {Kind = InvoiceKind.WebInvoice, Code = "Single_Insert_1"},
commandType: CommandType.StoredProcedure,
transaction: transaction);
transaction.Commit();
}
// Stored Procedure
var affectedRows = connection.Execute(sql,
new {Kind = InvoiceKind.WebInvoice, Code = "Single_Insert_1"},
commandType: CommandType.StoredProcedure);

للاتصال بنا CONTACT US

الاسم Name

بريد إلكتروني Email *

رسالة Message *

2015-2016 © All Rights Reserved Omarsoft
Back To Top