EntityFramework执行SQL语句

在EF中执行Sql语句。

Insert Code:

using (var context = new EFRecipesEntities())
{
   string sql = @"insert into Chapter3.Payment(Amount, Vendor)
                     values (@Amount, @Vendor)";
   var args = new DbParameter[] {
                   new SqlParameter { ParameterName = "Amount", Value = 99.97M},
                   new SqlParameter { ParameterName = "Vendor", Value="Ace Plumbing"}
                 };
   int rowCount = context.ExecuteStoreCommand(sql, args);
}

 select all code:

using (var context = new EFRecipesEntities())
{
   string sql = "select * from Chapter3.Student where Degree = @Major";
   var args = new DbParameter[] {
                  new SqlParameter {ParameterName = "Major", Value = "Masters"}};
   var students = context.ExecuteStoreQuery<Student>(sql, args);
   Console.WriteLine("Students...");
   foreach (var student in students)
   {
     Console.WriteLine("{0} {1} is working on a {2} degree",
   student.FirstName, student.LastName, student.Degree);
  }
}

 select specific column

using (var conn = new EntityConnection("name=EFRecipesEntities"))
{
    var cmd = conn.CreateCommand();
    conn.Open();
    cmd.CommandText = @"select c.Name, C.Email from
                                  EFRecipesEntities.Customers as c";
    using (var reader = cmd.ExecuteReader(CommandBehavior.SequentialAccess))
     {
       while (reader.Read())
           {
               Console.WriteLine("{0}'s email is: {1}",
                                   reader.GetString(0), reader.GetString(1));
          }
    }
}