Tuesday, 11 March 2014

IEnumerable VS IQueryable



LINQ to query data from database and collections, we use IEnumerable and IQueryable for data manipulation. IEnumerable is inherited by IQueryable, hence it has all the features of it and except this, it has its own features. Both have its own importance to query data and data manipulation. Let’s see both the features and take the advantage of both the features to boost your LINQ Query performance.

IEnumerable
1)    IEnumerable exists in System.Collections Namespace.
2)    IEnumerable can move forward only over a collection, it can’t move backward and between the items.
3)    IEnumerable is best to query data from in-memory collections like List, Array etc.
4)    While query data from database, IEnumerable execute select query on server side, load data in-memory on client side and then filter data.
5)    IEnumerable is suitable for LINQ to Object and LINQ to XML queries.
6)    IEnumerable supports deferred execution.
7)    IEnumerable doesn’t support custom query.
8)    IEnumerable doesn’t support lazy loading. Hence not suitable for paging like scenarios.
9)    Extension methods support by IEnumerable takes functional objects.
MyDataContext dc = new MyDataContext ();
IEnumerable<Employee> list = dc.Employees.Where(p => p.Name.StartsWith("S"));
list = list.Take<Employee>(10);

Generated SQL statements of above query will be:
SELECT [t0].[EmpID], [t0].[EmpName], [t0].[Salary] FROM [Employee] AS [t0]
WHERE [t0].[EmpName] LIKE @p0
Notice that in this query "top 10" is missing since IEnumerable filters records on client side.


IQueryable
1)    IQueryable exists in System.Linq Namespace.
2)    IQueryable can move forward only over a collection, it can’t move backward and between the items.
3)    IQueryable is best to query data from out-memory (like remote database, service) collections.
4)    While query data from database, IQueryable execute select query on server side with all filters.
5)    IQueryable is suitable for LINQ to SQL queries.
6)    IQueryable supports deferred execution.
7)    IQueryable supports custom query using CreateQuery and Execute methods.
8)    IQueryable support lazy loading. Hence it is suitable for paging like scenarios.
9)    Extension methods support by IQueryable takes expression objects means expression tree.
MyDataContext dc = new MyDataContext ();
IQueryable<Employee> list = dc.Employees.Where(p => p.Name.StartsWith("S"));
list = list.Take<Employee>(10);
Generated SQL statements of above query will be:
SELECT TOP 10 [t0].[EmpID], [t0].[EmpName], [t0].[Salary] FROM [Employee] AS [t0]
WHERE [t0].[EmpName] LIKE @p0
Notice that in this query "top 10" is existing since IQueryable executes query in SQL server with all filters.


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