# IUnionQueryDataPersistenceService{TEntity}

`IUnionQueryDataPersistenceService<TEntity>` in assembly SanteDB.Core.Api version 3.0.1980.0

## Summary

Represents a data persistence provider that can store and continue queries

## Operations

| Operation | Response/Return       | Input/Parameter                                                                                                                                                                                                     | Description                  |
| --------- | --------------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | ---------------------------- |
| Union     | IEnumerable\<TEntity> | *Expression`1[]* **queries**<br/>*Guid* **queryId**<br/>*Int32* **offset**<br/>*Nullable&lt;Int32>* **count**<br/>*Int32&* **totalCount**<br/>*IPrincipal* **overrideAuthContext**<br/>*ModelSort`1\[]* **orderBy** | Queries or continues a query |

## Implementations

None

## Example Implementation

```csharp
/// Example Implementation
using SanteDB.Core.Services;
/// Other usings here
public class MyUnionQueryDataPersistenceService<TEntity> : SanteDB.Core.Services.IUnionQueryDataPersistenceService<TEntity> { 
	public String ServiceName => "My own IUnionQueryDataPersistenceService`1 service";
	/// <summary>
	/// Queries or continues a query
	/// </summary>
	public IEnumerable<TEntity> Union(Expression`1[] queries,Guid queryId,Int32 offset,Nullable<Int32> count,Int32& totalCount,IPrincipal overrideAuthContext,ModelSort`1[] orderBy){
		throw new System.NotImplementedException();
	}
}
```

## References

* [IUnionQueryDataPersistenceService\<TEntity> C# Documentation](http://santesuite.org/assets/doc/net/html/T_SanteDB_Core_Services_IUnionQueryDataPersistenceService_1.htm)