public void CanSelectDynamic()
{
using (var db = new EF7BloggContext())
{
var authorToSerachFor = Fixture.Create<string>();
var blog = new Blog() { Name = Fixture.Create<string>(), Description = Fixture.Create<string>() };
db.AddRange(new[] { blog });
db.SaveChanges();
var retrievedBlog = db.Set<Blog>()
.Include(p => p.Posts)
.ToList();
//.Select(p => new { p.Author })
//.ToList();
//.SelectDynamic(new[] { nameof(Blog.Author) });
foreach (var blog1 in retrievedBlog)
{
Assert.IsNotNull(blog1);
}
}
}
private Type CreateLambbda(out Expression <Func <T, dynamic> > lambda)
{
/*
* Based in the follwing:
*
* var projector = rep.PropertySelectBuilder(blog)
* .Select(p => p.Name)
* .Include<Post>(m => m.Posts, p => p.Text)
* .Build();
*
*
* Output lambda to be used as expression in:
*
* context.Set<T>().
* Where(p => p.Id == id).
* Select(lamdba.Expression).
* Single();
*
*
* where lambda will look (using AllProjections in the builder), using example projector above
*
* p = new
* {
* p => p.Name,
* Posts = from post in context.Set<Post>()
* where post.BlogId == _id
* select new
* {
* Text = pp.Text
* }
* }
*/
List <KeyValuePair <string, Type> > anonymousTypeProperties = new List <KeyValuePair <string, Type> >();
List <Expression> anonymousTypePropertiesValues = new List <Expression>();
ParameterExpression lambdaParameter = Expression.Parameter(typeof(T), "p");
foreach (var projection in AllProjections.BaseEntityProjections)
{
var projectionLambda = projection as LambdaExpression;
MemberExpression member = ParameterHelper.GetMemberExpression(projectionLambda);
var propertyInfo = (PropertyInfo)member.Member;
var propertyName = propertyInfo.Name;
var propertyType = propertyInfo.PropertyType;
var memberAccess = Expression.Property(lambdaParameter, propertyName);
anonymousTypeProperties.Add(new KeyValuePair <string, Type>(propertyName, propertyType));
anonymousTypePropertiesValues.Add(memberAccess);
}
foreach (var navigationProperty in AllProjections.NavigationPropertiesProjections)
{
var navigationProperyType = navigationProperty.Type;
// Creates the <T>.where(p => p.id == id) part of the expression
MethodCallExpression whereCallExpression = CreateWhereCall <T>(_id, navigationProperyType);
ParameterExpression p1 = Expression.Parameter(navigationProperyType, "p1");
var navigationPropertyAnoymousTypeProperties = new List <KeyValuePair <string, Type> >();
List <MemberExpression> navigationPropertyAnoymousTypePropertiesValues = new List <MemberExpression>();
foreach (var projection in navigationProperty.Projections)
{
var navigationPropertyProjection = projection as LambdaExpression;
MemberExpression member = ParameterHelper.GetMemberExpression(navigationPropertyProjection);
var propertyInfo = (PropertyInfo)member.Member;
var propertyName = propertyInfo.Name;
var propertyType = propertyInfo.PropertyType;
var memberAccess = Expression.Property(p1, propertyName);
navigationPropertyAnoymousTypeProperties.Add(new KeyValuePair <string, Type>(propertyName, propertyType));
navigationPropertyAnoymousTypePropertiesValues.Add(memberAccess);
}
var anonymousTypeOfNavigationPropertyProjection =
AnonymousTypeUtils.CreateType(navigationPropertyAnoymousTypeProperties);
Type typeOfSubProj = null;
var anonymousTypeOfNavigationPropertyProjectionConstructor = anonymousTypeOfNavigationPropertyProjection
.GetConstructor(navigationPropertyAnoymousTypeProperties.Select(kv => kv.Value).ToArray());
typeOfSubProj = anonymousTypeOfNavigationPropertyProjectionConstructor.ReflectedType;
var selectMethod = typeof(Queryable).GetMethods().Where(m => m.Name == "Select").ToList()[0];
var genericSelectMethod = selectMethod.MakeGenericMethod(navigationProperyType, typeOfSubProj);
var newInstanceOfTheGenericType = Expression.New(anonymousTypeOfNavigationPropertyProjectionConstructor,
navigationPropertyAnoymousTypePropertiesValues);
var projectionLamdba = Expression.Lambda(newInstanceOfTheGenericType, p1);
MethodCallExpression selctCallExpression = Expression.Call(
genericSelectMethod,
whereCallExpression,
projectionLamdba);
var provider = ((IQueryable)_context.Set <T>()).Provider;
// TODO, Is it ok to assume navigation properties has the same provider?
var theMethods = typeof(IQueryProvider).GetMethods();
var createQMethd = theMethods.Where(name => name.Name == "CreateQuery").ToList()[1];
var speciifMethod =
createQMethd.MakeGenericMethod(anonymousTypeOfNavigationPropertyProjectionConstructor.ReflectedType);
var navigationProppertyQueryWithProjection1 = speciifMethod.Invoke(provider, new object[] { selctCallExpression });
Type genericFunc = typeof(IEnumerable <>);
Type funcOfTypeOfSubProj = genericFunc.MakeGenericType(typeOfSubProj);
var allMethodsOnEnumerableClass = typeof(Enumerable).GetMethods();
var genericToListMethod = allMethodsOnEnumerableClass.Where(m => m.Name == "ToList").ToList()[0];
var toListOfTypeOfSubProj = genericToListMethod.MakeGenericMethod(typeOfSubProj);
MethodCallExpression toListExpression11 = Expression.Call(
toListOfTypeOfSubProj,
Expression.Constant(navigationProppertyQueryWithProjection1));
anonymousTypeProperties.Add(new KeyValuePair <string, Type>(navigationProperty.Name, funcOfTypeOfSubProj));
anonymousTypePropertiesValues.Add(toListExpression11);
}
var projectedEntityAnonymousType = AnonymousTypeUtils.CreateType(anonymousTypeProperties);
var constructor = projectedEntityAnonymousType.GetConstructor(anonymousTypeProperties.Select(p => p.Value).ToArray());
var anonymousTypeInstance = Expression.New(constructor, anonymousTypePropertiesValues);
lambda = Expression.Lambda <Func <T, dynamic> >(anonymousTypeInstance, lambdaParameter);
return(projectedEntityAnonymousType);
}
public void CanRetriveUsingTableValuedFunction()
{
/*
USE [EF7]
GO
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
DROP FUNCTION[dbo].[SearchBlogs];
GO
CREATE FUNCTION[dbo].[SearchBlogs]
(
@param2 nvarchar(200)
)
RETURNS @returntable TABLE
(
Id int,
Author nvarchar(200),
Name nvarchar(200),
Description nvarchar(200)
)
AS
BEGIN
INSERT @returntable
SELECT
blogs.Id, blogs.Name, blogs.Author, blogs.Description
from dbo.Blog blogs
where
blogs.Name like @param2
RETURN
END
*/
using (var db = new EF7BloggContext(ServiceProvider))
{
//EnsureCleanDatabase(db);
db.Blogs.Add(new Blog() { Name = "ADO.NET Blog" });
db.Blogs.Add(new Blog() { Name = "Visual Studio" });
db.Blogs.Add(new Blog() { Name = ".NET Blog" });
db.SaveChanges();
/*
1. Parameterized, not open to sql injection
2. Strongly typed (renaming properties)
3. The order by is happening in the database, not in memory.
*/
var nameToSerachFor = "blog";
var seachedBlogs = db.Set<Blog>()
.FromSql("select * from dbo.SearchBlogs (@p0)", nameToSerachFor);
//.OrderBy(b => b.Name); // <-- Strongly typed
foreach (var blog in seachedBlogs)
{
var found = blog.Name;
}
}
}
public void CanPerformSomeInMermoryAndSomeInDatabase()
{
using (var db = new EF7BloggContext(ServiceProvider))
{
//EnsureCleanDatabase(db);
db.Blogs.Add(new Blog() { Name = "ADO.NET Blog" });
db.Blogs.Add(new Blog() { Name = "Visual Studio" });
db.Blogs.Add(new Blog() { Name = ".NET Blog" });
db.SaveChanges();
var seachedBlogs = db.Set<Blog>()
.OrderBy(b => GetSortName(b.Name))
.Where(b => b.Name.Contains(("blog"))); // Some parts of the query in db (where) and some inmemory (GetSortName)
foreach (var blog in seachedBlogs)
{
var found = blog.Name;
}
}
}
public void CanIncludeThenIncludeNavigationProperties()
{
using (var db = new EF7BloggContext(ServiceProvider))
{
//EnsureCleanDatabase(db);
db.Blogs.Add(new Blog() { Name = "ADO.NET Blog" });
db.Blogs.Add(new Blog() { Name = "Visual Studio" });
db.Blogs.Add(new Blog() { Name = ".NET Blog" });
db.SaveChanges();
var seachedBlogs = db.Set<Blog>()
.Include((b => b.Posts)) // Eager loading, in ef6 10 blog with 10 posts each
.Where(b => b.Name.Contains("blog"));
foreach (var blog in seachedBlogs)
{
var found = blog.Name;
}
}
}
public T Add <T>(T entity) where T : class, IEntity
{
context.Set <T>().Add(entity);
return(entity);
}
