Dynamic Query

It's a library that allows you to easily query a queryable using a criteria object.

It also offers, to intercept the query using IQueryInterceptor implementations.

Getting Started

Install nuget package to your awesome project.

Full Version	NuGet	NuGet Install
PoweredSoft.DynamicQuery		PM> Install-Package PoweredSoft.DynamicQuery
PoweredSoft.DynamicQuery.Core		PM> Install-Package PoweredSoft.DynamicQuery.Core
PoweredSoft.DynamicQuery.AspNetCore		PM> Install-Package PoweredSoft.DynamicQuery.AspNetCore

Using in ASP.NET Core

The package Asp.net core of dynamic query will help you start to use Dynamic Query faster in your web project.

How to configure during startup

using PoweredSoft.DynamicQuery.AspNetCore;

public class Startup
{
    public void ConfigureServices(IServiceCollection services)
    {
        services.AddDynamicQueryDefaultMappings();
        var minimumDependencyServiceProvider = services.BuildServiceProvider();
        services.AddMvc().AddDynamicQueryJsonConverter(minimumDependencyServiceProvider);
    }
}

How to use in a controller

[HttpPost]
public IQueryExecutionResult Read(
    [FromServices]YourContext context, 
    [FromServices]IQueryHandler handler,
    [FromBody]IQueryCriteria criteria)
{
    IQueryable<OfSomething> query = context.Somethings;
    var result = handler.Execute(query, criteria);
    return result;
}

Sample Web Project - ASP.NET CORE + EF Core

Visit: https://github.com/PoweredSoft/DynamicQueryAspNetCoreSample

Criteria

Criteria must implement the following interfaces

Object	Interface	Implementation	Example	Description
Query Criteria	interface	default implementation	test	Wraps the query parameters
Paging	interface	default implementation	test	Paging support
Filter	interface	default implementation	test	Represent a filter to be executed
Simple Filter	interface	default implementation	test	Represent a simple filter to be executed
Composite Filter	interface	default implementation	test	Represent a composite filter to be executed
Sort	interface	default implementation	test	Represent a sort to be executed
Group	interface	default implementation	test	Represent a group to be executed
Aggregate	interface	default implementation	test	Represent an aggregate to be executed

Sample

var criteria = new QueryCriteria
{
    Page = 1,
    PageSize = 12,
    Filters = new List<IFilter>
    {
        new SimpleFilter { Path = "FirstName", Type = FilterType.Equal, Value = "John" }
    }
};

var queryHandler = new QueryHandler();
IQueryExecutionResult result = queryHandler.Execute(someQueryable, criteria);

Query Result

Here is the interfaces that represent the result of query handling execution.

public interface IAggregateResult
{
    string Path { get; set; }
    AggregateType Type { get; set; }
    object Value { get; set; }
}

public interface IQueryResult
{
    List<IAggregateResult> Aggregates { get; }
    List<object> Data { get; }
}

public interface IGroupQueryResult : IQueryResult
{
    string GroupPath { get; set; }
    object GroupValue { get; set; }
}

public interface IQueryExecutionResult : IQueryResult
{
    long TotalRecords { get; set; }
    long? NumberOfPages { get; set; }
}

Interceptors

Interceptors are meant to add hooks at certain part of the query handling to allow alteration of the criterias or the queryable it self.

The following is documented in the order of what they are called by the default query handler implementation.

Before the expression is being built

Interceptor	Interface	Example	Description
IIncludeStrategyInterceptor	interface	test	This is to allow you to specify include paths for the queryable
IIncludeStrategyInterceptor<T>	interface	test	This is to allow you to specify include paths for the queryable
IBeforeQueryFilterInterceptor	interface	test	Before adding the filters to the expression
IBeforeQueryFilterInterceptor<T>	interface	test	Before adding the filters to the expression
INoSortInterceptor	interface	test	This is called to allow you to specify an OrderBy in case none is specified, to avoid paging crash with EF6
INoSortInterceptor<T>	interface	test	This is called to allow you to specify an OrderBy in case none is specified, to avoid paging crash with EF6

After/During expression building before query execution

Interceptor	Interface	Example	Description
IFilterInterceptor	interface	test	This interceptor allows you to change the behavior of a IFilter being applied to the queryable
ISortInterceptor	interface	test	This interceptor allows you to change the behavior of a ISort being applied to the queryable
IGroupInterceptor	interface	test	This interceptor allows you to change the behavior of a IGroup being applied to the queryable
IAggregateInterceptor	interface	test	This interceptor allows you to change the behavior of a IAggregate being applied to the queryable

Post Query execution

Interceptor	Interface	Example	Description
IQueryConvertInterceptor	interface	test	This interceptor allows you to replace the object that is being returned by the query, by another object instance
IQueryConvertInterceptor<T>	interface	test	This interceptor allows you to replace the object that is being returned by the query, by another object instance