B_110500002

MySQL, LINQ and the ADO.NET Entity Framework ,[object Object],[object Object]

Agenda ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Working with DataSets ,[object Object],//Execute a query, retrieve and store the results connectionString = "Data Source=localhost;User ID=...;" ; commandText = "SELECT CompanyName, City FROM Customers " + "WHERE Country = ?Country" ; adapter = new MySqlDataAdapter (commandText, connectionString); adapter.SelectCommand.Parameters.AddWithValue( "?Country", "Brazil"); table = new DataTable (); adapter.Fill(table); //Display the results DataGridView resultsGrid = new DataGridView (); resultsGrid.DataSource = table; //Submit pending changes commandBuilder = new MySqlCommandBuilder (adapter); adapter.Update(table);

Working with DataSets ,[object Object],[object Object],[object Object],[object Object],[object Object]

Moving to data access layers ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Moving to data access layers ,[object Object],//Partial class to separate data access code public class Customer { //Add methods to return data public static List < Customer > GetCustomers ( string country) { List < Customer > results = new List < Customer > (); MySqlConnection connection = new MySqlConnection (connectString); connection.Open(); MySqlCommand command = new MySqlCommand (queryString, connection); command.Parameters.AddWithValue( "?Country" , country); MySqlDataReader reader = command.ExecuteReader(); while (reader.Read()) results.Add( Customer .CreateFromReader(reader)); return results; } //Support tracking and submitting changes private string origCustomerId, origCompanyName, ...; public void SubmitChanges() { ... } }

Introducing LINQ ,[object Object],[object Object],[object Object],[object Object]

Introducing LINQ ,[object Object],//Create an array of integers int [] myarray = new int [] { 49, 28, 20, 15, 25, 23, 24, 10, 7, 34 }; //Create a query for odd numbers var oddNumbers = from i in myarray where i % 2 == 1 select i; //Display the results of the query foreach ( int i in oddNumbers) Console .WriteLine(i); //Create a query for odd numbers, sorted var oddNumbers = from i in myarray where i % 2 == 1 orderby i select i; //Create a query for odd numbers, sorted in descending order var oddNumbers = from i in myarray where i % 2 == 1 orderby i descending select i; //Create a query for odd numbers var oddNumbers = from i in myarray where i % 2 == 1 select i; //Compose the original query to create a query for odd numbers var sorted = from i in oddNumbers orderby i descending select i;

LINQ-enabled classes ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

LINQ to DataSet ,[object Object],[object Object],Dim ordersQuery = From o In dataSet.Orders _ Where o.CustomerID = "ALFKI" _ Select o For Each o As NorthwindDataSet.OrdersRow In ordersQuery Console.WriteLine( "{0} {1,10:d}" , _ o.OrderID, o.OrderDate) Next o

LINQ to DataSet ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

LINQ to SQL ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

[object Object],[object Object],LINQ to Entities ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

LINQ to Entities or LINQ to SQL? ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

LINQ to Entities: Generating Queries ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Entity Framework: LINQ and more ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],ADO.NET Provider EntityClient ObjectServices LINQ to Entities

Entity Framework Query Options ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],var ordersQuery = from o in context.Orders where o.Customers.CustomerID == "ALFKI" select o; foreach ( var o in ordersQuery) Console .WriteLine( "{0} {1:d}" , o.OrderID, o.OrderDate);

Entity Framework Query Options ,[object Object],[object Object],[object Object],[object Object],[object Object],Dim eql As String = "SELECT VALUE o FROM Orders AS o " & _ " WHERE o.Customer.CustomerID = 'ALFKI'" Dim ordersQuery = context.CreateQuery( Of Order)(esql) For Each o As Order In ordersQuery Console.WriteLine( "{0} {1,10:d} " , o.OrderID, o.OrderDate) Next o

Entity Framework Query Options ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],string eSql = "SELECT VALUE o FROM NorthwindEntities.Orders AS o " + "WHERE o.Customers.CustomerID = 'ALFKI'" ; EntityCommand cmd = new EntityCommand (eSql, connectionString); EntityDataReader rdr = cmd.ExecuteReader(); while (rdr.Read()) Console .WriteLine( "{0} {1:d}" , rdr[ "OrderID" ], rdr[ "OrderDate" ]);

ADO.NET Data Services ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

ADO.NET Data Services ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Summary - LINQ ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Summary - ADO.NET Entity Framework ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Summary - ADO.NET Data Services ,[object Object],[object Object],[object Object],[object Object],[object Object]

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