# Class PersistenceProviderId OptimaJet.Workflow.Core.PersistenceProviderId Provides identifiers for default Workflow Engine persistence providers. Namespace: [OptimaJet.Workflow.Core](https://api.workflowengine.io/core/OptimaJet.Workflow.Core/) ```csharp public static class PersistenceProviderId ``` ## Fields `public const string Mongo = "Mongo"` Gets the identifier for the Mongo database persistence provider. `public const string Mssql = "Mssql"` Gets the identifier for the Microsoft SQL Server persistence provider. `public const string Mysql = "Mysql"` Gets the identifier for the MySQL persistence provider. `public const string Oracle = "Oracle"` Gets the identifier for the Oracle database persistence provider. `public const string Postgres = "Postgres"` Gets the identifier for the PostgreSQL persistence provider. `public const string Sqlite = "Sqlite"` Gets the identifier for the SQLite persistence provider. [Previous FormBase](https://api.workflowengine.io/core/OptimaJet.Workflow.Core/FormBase/) [Next RetryExtensions](https://api.workflowengine.io/core/OptimaJet.Workflow.Core/RetryExtensions/)