ComponentOne DataServices Edition
ADO.NET provider for ServiceNow / Caching
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Caching
In This Topic

Caching data offers several advantages that can improve overall process performance, including reduced API requests and faster data access.

The ADO.NET provider features an easy-to-use caching procedure that can also be shared by multiple connections. This article demonstrates the two types of caches that are currently supported:

To enable the caching feature, necessary connection properties are available, such as:

Internal caching

The following code demonstrates how to enable caching for a table by setting the UseCache property to True (by default, it is set to False). The cached data is stored in the file specified by the CacheLocation property in the connection string. For more information on Incremental Caching, refer to this topic.

C#
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static void LocalCache()
{
    //Define connection string
    string connectionString = $@"Username = *******; Password = *******; Oauth Client Id = *******;
            Oauth Client Secret = *******; Oauth Token Endpoint = http://****/****/****; Url= http://****/****/****; 
            Use Cache = true; Cache Tolerance = 500; Cache Location = 'C:\temp\c1cache.db';";

    using (C1ServiceNowConnection conn = new C1ServiceNowConnection(connectionString))
    {
        conn.Open();
        var cmd = conn.CreateCommand();
        cmd.CommandText = "SELECT * from incident";
        var rdr = cmd.ExecuteReader();
        while (rdr.Read())
        {
            Console.WriteLine(String.Format("\t{0} --> \t\t{1}-->\t\t\t{2}", rdr["caller_id"], rdr["category"], rdr["description"]));
        }
        Console.WriteLine("End Time " + DateTime.Now);
    }
}

External Caching

The ADO.NET provider for ServiceNow supports external caching, allowing users to store cached data in a separate database. This external database serves as a constant repository and can be accessed by multiple connection objects simultaneously. It includes all tables exposed by the ServiceNow provider and offers configuration options specific to the cache provider.

To utilize external caching, the provider supports a specified cache, such as SQL Server. You can specify the connection string using the UseCache, CacheProvider, and CacheConnection keys to enable external caching.

Note: With SQL Server, Cache Provider = ‘Microsoft.Data.SqlClient’ is mandatory so you must create your database as our cache doesn’t create a new Database.

The following code example implements external caching, by setting Use Cache to True, and using 'Microsoft.Data.SqlClient' as the cache provider.

C#
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static void ExternalCache()
{
    //Explicit MS SQL Cache Config
    string connectionString = $@"Username= *******; Password= *******; Oauth Client Id= *******;
    Oauth Client Secret= *******; Oauth Token Endpoint= http://****/****/****"; Url = http://****/****/****; Use Cache = true; 
    Cache provider = 'Microsoft.Data.SqlClient'; Cache connection = 'Server= yourserverid; Database= databasename; User Id= yourId; Password= yourpassword;'";

    static void DataReaderSelect()
    {
        Console.WriteLine("Start Time " + DateTime.Now);
        using (C1ServiceNowConnection con = new C1ServiceNowConnection(connectionString))
        {
            con.Open();
            var cmd = con.CreateCommand();
            cmd.CommandText = "SELECT * from incident";
            var rdr = cmd.ExecuteReader();
            while (rdr.Read())
            {
                Console.WriteLine(String.Format("\t{0} --> \t\t{1}-->\t\t\t{2}", rdr["caller_id"], rdr["category"], rdr["description"]));
            }
            Console.WriteLine("End Time " + DateTime.Now);
        }
    }
}