IQueryResultSetTDataUnion(ExpressionFuncTData, Boolean) Method

IQueryResultSet<TData> Union(
	Expression<Func<TData, bool>> query
)

Function Union ( 
	query As Expression(Of Func(Of TData, Boolean))
) As IQueryResultSet(Of TData)

IQueryResultSet<TData>^ Union(
	Expression<Func<TData, bool>^>^ query
)

abstract Union : 
        query : Expression<Func<'TData, bool>> -> IQueryResultSet<'TData> 

Parameters

query  ExpressionFuncTData, Boolean

[Missing <param name="query"/> documentation for "M:SanteDB.Core.Model.Query.IQueryResultSet`1.Union(System.Linq.Expressions.Expression{System.Func{`0,System.Boolean}})"]

Return Value

[Missing <returns> documentation for "M:SanteDB.Core.Model.Query.IQueryResultSet`1.Union(System.Linq.Expressions.Expression{System.Func{`0,System.Boolean}})"]

This method returns a new IQueryResultSetTData which contains a UNION of results in the current set and a new set described by query.

The method used to load these results depends on the underlying persistence layer, however in SQL would be:

In SQL based persistence services this results in a query similar to:

SELECT * FROM ( SELECT * FROM x WHERE sts_cd_id = 'ACTIVE_UUID' UNION SELECT * FROM x WHERE sts_cd_id = 'NEW_UUID' ) I WHERE crt_utc > CURRENT_TIMESTAMP;

Reference