You can work with any DB provider even if there's no special metadata provider available for it. Use the Universal Metadata Provider for DB providers that implement a database connection object inherited from the standard .NET DbConnection class.
See the code example below:
// Create connection using Devart component
String connectionString = "Data Source=192.168.1.4;Persist Security Info=True;User ID=hr;Password=1";
Devart.Data.Oracle.OracleConnection connection = new Devart.Data.Oracle.OracleConnection(connectionString);

// Create UniversalMetadataProvider
UniversalMetadataProvider mp = new UniversalMetadataProvider();
mp.Connection = connection;

// Set up the QueryBuilder
queryBuilder1.MetadataProvider = mp;
queryBuilder1.SyntaxProvider = new OracleSyntaxProvider();

// Load metadata
queryBuilder1.RefreshMetadata();

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