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Show / Hide Table of Contents
  • Programmer's Guide
  • Client Side API Programming
    • Setting Up Development Environment
    • Basic Cache Operations
      • Initialize Cache
      • Add Data to Cache
      • Update Data in Cache
      • Fetch Data From Cache
      • Remove Data From Cache
      • Dispose Cache
    • Bulk Operations
      • Adding Collection to Cache
      • Updating Collection in Cache
      • Retrieving Collection from Cache
      • Removing Collection from Cache
      • Deleting Collection from Cache
    • Asynchronous Operations
      • Using Asynchronous Operations
      • Using Asynchronous Operations with Callback Methods
    • Groups and Subgroups
      • Adding/Updating Data Group in Cache
      • Retrieving Data Group from Cache
      • Removing Data Group from Cache
    • Tagging Data in NCache
      • Creating Tags
      • Adding Items with Tags
      • Retrieving Previously Tagged Data
      • Removing Tagged Items from Cache
    • Named Tags
    • Data Expiration Strategies
      • Using Absolute Expiration
      • Using Sliding Expiration
    • Cache Dependencies
      • Key Dependency
      • File Dependency
      • Notification based Dependencies
        • Database Dependency using SQL Server
        • Database Dependency using Oracle
      • Polling Based Dependency
      • Custom Data Source Dependency
      • Multiple Cache Sync Dependency
      • Aggregate Dependency
      • Add Dependency to Existing Item
      • Using CLR Procedures to Call NCache
    • Locking Data in NCache
      • Locking Items in Cache (Pessimistic Locking)
      • Locking Items with Cache Item Versioning (Optimistic Locking)
    • SQL Reference for NCache
      • SQL Syntax
      • Querying Samples for Operators
      • Querying Data in NCache
      • NCache Language Integrated Query (LINQ)
        • Using LINQ in NCache
        • Configuring LINQPad for NCache
        • Querying NCache Data in LINQPad
    • Event Notifications
      • Cache Level Event Notifications
      • Item Level Event Notifications
      • Custom Event Notifications
    • Publish/Subscribe (Pub/Sub) in NCache
      • Pub/Sub Topics
      • Managing Topics
      • Pub/Sub Messages
        • Message Behavior and Properties
        • Creating a Message
      • Publish Messages to Topic
      • Subscribe for Topic Messages
      • Monitoring Pub/Sub Topics
    • Continuous Query
    • Using Streams in NCache
      • Opening with Stream Modes
      • Adding and Updating Data with Streams
      • Retrieving Data from Streams
      • Closing a Stream
    • Security and Encryption
      • NCache Security
      • NCache Data Encryption
    • Data Compression
    • NCache Management API
  • Server Side API Programming
    • Cache Startup Loader
      • Components of Cache Startup Loader
      • Sample Implementation of ICacheLoader on Single Node
      • Sample Implementation of ICacheLoader with Distribution Hints
    • Data Source Providers (Backing Source)
      • Read-Through Caching
        • Configure Read-Through Provider
        • Using Read-Through with Cache Operations
      • Write-Through Caching
        • Configuring Write-Through Provider
        • Using Write-Through with Basic Operations
        • Using Write-Behind with Basic Operations
        • Using Write-Behind with Bulk Operations
        • Using Write-Behind with Async Operations
        • Monitor Write-Through Counters
    • Custom Dependency
      • Sample Implementation of Custom Dependency
      • Sample Usage of Custom Dependency
    • WAN Replication through Bridge
      • Bridge Configurations
      • Implementing Bridge Conflict Resolver
    • Entry Processor
      • Sample Implementation of IEntryProcessor Interface
      • Sample Usage of EntryProcessor
    • MapReduce
      • Sample Implementation of MapReduce Interfaces
      • Sample Usage of MapReduce
    • Aggregator
      • Sample Implementation of IValueExtractor Interface
      • Sample Implementation of IAggregator Interface
      • Sample Usage of Aggregator
    • Dynamic Compact Serialization
  • Client Side ASP.NET Features
    • ASP.NET
      • ASP.NET Session State Provider for NCache
      • Multi-Region ASP.NET Session State Provider for NCache
    • ASP.NET Core
      • Session Storage in ASP.NET Core
        • Configure NCache ASP.NET Core Session Provider
        • Configure ASP.NET Core Sessions with NCache IDistributedCache Provider
      • Multi-Region ASP.NET Core Session Provider for NCache
      • Object Caching in ASP.NET Core
    • ASP.NET SignalR
      • Using NCache Extension for SignalR
    • View State Caching
      • Configuring and Using Content Optimization
      • Group View State with Sessions
      • Limit View State Caching
      • Perform Page Level Grouping for View State
    • ASP.NET Output Cache
      • Configure ASP.NET Output Caching
      • Using ASP.NET Output Cache with Custom Hooks
  • Client Side Third Party Integrations
    • Migrating AppFabric to NCache
      • AppFabric API vs. NCache API
    • NHibernate
      • NCache as NHibernate Second Level Cache
      • Using NHibernate Query Caching
      • Configuring Database Synchronization with NHibernate
    • Entity Framework Caching Integration
      • NCache as Entity Framework Second Level Cache
      • Entity Framework Caching Config File
    • Entity Framework Core Caching
      • Installing NCache Entity Framework Core Provider
      • Configuring NCache Entity Framework Core Provider
      • Using NCache Entity Framework Core Provider
        • Caching Options for EF Core Provider
        • LINQ APIs for EF Core Provider
        • Cache Only APIs for EF Core Provider
        • Query Deferred APIs for EF Core Provider
      • Logging in NCache Entity Framework Core Provider
    • Memcached
      • NCache Memcached Gateway Approach
      • Memcached Client Plugin for .NET
    • Debug NCache Providers in Visual Studio
    • NCache for Visual Studio Extension

NCache Supported SQL Syntax

You have to make API calls and specify a search based on SQL in order to fetch a collection of objects from the cache. For the above mentioned scenario, you just have to select all products related to required category and it will return all related key or items.

NCache requires all searchable attributes to be indexed before using those indexes.

NCache supports a SQL. You can use different operators according to your required query criteria to fetch the desired result set from your cache.

Note

Object Query Language is not case sensitive.

Syntax of the language is explained with the help of examples below:

Basic Query Operators

Operator Description Use (Example)
= OR == Equals to SELECT Product WHERE this.ProductID == ?
!= OR <> Not equals to SELECT Product WHERE this.ProductID <> ?
< Less than SELECT Product WHERE this.ProductID < ?
> Greater than SELECT Product WHERE this.ProductID > ?
<= Less than equal to SELECT Product WHERE this.ProductID <= ?
>= Greater than equal to SELECT Product WHERE this.ProductID >= ?
IN In a range SELECT Product this.UnitsAvailable IN (?,?,?,?))
LIKE Pattern like. Mostly used for wild card base searching. Use * for one or many occurrence of character. Use . for single occurrence of character. SELECT Product WHERE this.ProductName LIKE ? AND this.Category LIKE ?
NOT LIKE Not like pattern SELECT Product WHERE this.ProductID NOT LIKE ?

Logical Query Operators

Operator Description Use (Example)
AND Retrieve merged result set for two or more conditions. SELECT Product WHERE this.ProductName LIKE ? AND this.Category LIKE ?
OR Retrieve result set which fulfills any one condition. SELECT Product WHERE this.ProductName NOT LIKE ? OR this.Category NOT LIKE ?
NOT Retrieve result set which doesn't match the given criteria. SELECT Product WHERE this.ProductID NOT LIKE ?

Aggregate Functions

Operator Description Use (Example)
SUM Calculate sum of result set of specified criteria. SELECT SUM(Product.UnitsAvailable) WHERE this.ProductID <= 10
COUNT Calculates count of the result set for a specified criteria. SELECT count(Product) WHERE this.ProductID < ?
AVG Calculates average of the result set for specified criteria. SELECT AVG(Product.UnitsAvailable) WHERE this.ProductID < ?
MIN Returns minimum of the result set for specified criteria. SELECT MIN(Product.UnitsAvailable) WHERE this.Category = ?
MAX Returns maximum of the result set for specified criteria. SELECT MAX(Product.UnitsAvailable) WHERE this.Category = ?

Miscellaneous

Operator Description Use (Example)
GROUP BY Group data based on an aggregate function. SELECT this.Category, COUNT(Product) WHERE this.ProductID > ? GROUP BY this.Category
ORDER BY Sort the result set based on criteria in descending or ascending order. SELECT Product WHERE this.Category = ? ORDER BY this.Category
DateTime.Now Retrieve result set with respect to current date time. SELECT Order WHERE this.OrderDate < DateTime.Now
DateTime (any date time compatible string) Retrieve result set with respect to specified date time. SELECT Order WHERE this.OrderDate = DateTime(2017, 6, 20)
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