public void TestUnion()
{
const int resultRowCount = 5;
// create QueryDesigner with ElementType == Products
var queryDesinger = new QueryDesigner(context, typeof(Products));
//create root node which elementType has the same type in queryDesigner
var root = new JoinNode(typeof(Products));
// create child node Categories with propertyName "Products".
// Because Categories linked with Products by next property:
// public EntitySet<Products> Products
var categoryNode = new JoinNode(typeof(Categories), "Category", "Products");
// add categoryNode to root node
root.AddChildren(categoryNode);
// create filter by Products.ProductName like "%l%"
var productNameCondition = new Condition("ProductName", "l", ConditionOperator.Like);
root.AddConditions(productNameCondition);
// create filter by Categories.Description like "Sweet%"
var categoryNameCondition = new Condition("Description", "Sweet", ConditionOperator.StartsWith, typeof(Categories));
categoryNode.AddConditions(categoryNameCondition);
// create ordering, because we call Skip and Take method.
Ordering order = new Ordering("ProductName");
// make join Products table with Categories filtered by conditions
// and ordered by already created ordering
queryDesinger.Join(root, new OrderingList(order));
QueryDesigner cloneQueryDesigner = (QueryDesigner)queryDesinger.Clone();
queryDesinger.Skip(0).Take(3);
cloneQueryDesigner.Skip(2).Take(4);
queryDesinger.Union(cloneQueryDesigner);
var list = new List<Products>(queryDesinger.Cast<Products>());
Assert.AreEqual(resultRowCount, list.Count);
}
public void TestJoinWithTwoChildrenAndComplicatedFilterAndOrderings()
{
const string productName = "Louisiana";
const string categoryName = "Condiments";
const int resultRowCount = 9;
//create root node
var root = new JoinNode(typeof(Products));
// add first child node Categories with propertyName "Products".
// Because Categories linked with Products by next property:
// public EntitySet<Products> Products
var categoryNode = new JoinNode(typeof(Categories), "Category", "Products");
root.AddChildren(categoryNode);
// add second child node Order_Details. PropertyName not defined
// because Order_Details linked with Products by next property:
// public Products Products - name of property is equal name of type
var orderDetailNode = new JoinNode(typeof(Order_Details), "Order_Detail", "Products");
root.AddChildren(orderDetailNode);
var queryDesinger = new QueryDesigner(context, root);
// create conditions for filtering by ProductName Like "Louisiana%" Or CategoryName == "Condiments"
var productCondition = new Condition("ProductName", productName, ConditionOperator.StartsWith,
typeof(Products));
var categoryCondition = new Condition("CategoryName", categoryName, ConditionOperator.EqualTo,
typeof(Categories));
var orCondition = new OrCondition(productCondition, categoryCondition);
// create condition for filtering by [Orders Details].Discount > 0.15
var discountCondition = new Condition("Discount", 0.15F, ConditionOperator.GreaterThan,
typeof(Order_Details));
var conditionals = new ConditionList(orCondition, discountCondition);
// assign conditions
// queryDesinger.Where(conditionals);
// make Distinct
queryDesinger.Distinct();
// make orderings by ProductName and CategoryName
var productNameOrder = new Ordering("ProductName", SortDirection.Ascending, typeof(Products));
// var categoryNameOrder = new Ordering("CategoryName", SortDirection.Descending, typeof(Categories));
queryDesinger.OrderBy(new OrderingList(productNameOrder/*, categoryNameOrder*/));
IQueryable<Products> distictedProducts = queryDesinger.Cast<Products>();
var list = new List<Products>(distictedProducts);
Assert.AreEqual(resultRowCount, list.Count);
string query =
@" SELECT DISTINCT Products.ProductID, Products.ProductName, Products.SupplierID, Products.CategoryID, Products.QuantityPerUnit, Products.UnitPrice, Products.UnitsInStock, Products.UnitsOnOrder, Products.ReorderLevel, Products.Discontinued
FROM Products
INNER JOIN Categories ON Products.CategoryID = Categories.CategoryID
INNER JOIN [Orders Details] ON Products.ProductID = [Orders Details].ProductID
WHERE [Orders Details].Discount > 0.15
AND ((Products.ProductName LIKE N'Louisiana%') OR (Categories.CategoryName = N'Condiments'))";
CheckDataWithExecuteReaderResult(query, resultRowCount, list);
}