Aninhamento de expressões FOR XML
Pergunta
Tentei uma consulta FOR XML semelhante à mostrada aqui sob o subtítulo 'Aninhamento de expressões FOR XML'.Meu problema é que preciso ter três níveis de elementos XML.Os resultados devem ser algo assim.
<StepTree Name="ALFKI">
<Step Name="Foo">
<Result id="123" />
<Result id="456" />
</Step>
<Step Name="Bar">
<Result id="789" />
<Result id="987" />
</Step>
</StepTree >
Eu tentei esse tipo de consulta.
SELECT 1 as TAG,
NULL as Parent,
StepTrees.Name AS [StepTree!1!Name],
NULL as [Step!2!Name],
NULL as [Result!3!id]
FROM StepTrees
WHERE StepTrees.Name = 'ALFKI'
UNION ALL
SELECT 2,
1,
StepTrees.Name,
Steps.Name,
NULL
FROM Steps
JOIN StepTrees ON Steps.StepTreeId = StepTrees.Id
WHERE StepTrees.Name = 'ALFKI'
UNION ALL
SELECT DISTINCT 3,
2,
StepTrees.Name,
Steps.Name,
Results.id
FROM StepTrees
JOIN Steps ON Steps.StepTreeId = StepTrees.Id
JOIN Results ON Steps.StepId = Results.StepId
FOR XML EXPLICIT
O XML resultante é o seguinte.
<StepTree Name="ALFKI">
<Step Name="Foo" />
<Step Name="Bar">
<Result id="123" />
<Result id="456" />
<Result id="789" />
<Result id="987" />
</Step>
</StepTree >
Alguma ideia?
Solução
Use esta consulta:
SELECT 1 as TAG,
NULL as Parent,
StepTrees.Name AS [StepTree!1!Name],
NULL as [Step!2!Name],
NULL as [Result!3!id]
FROM StepTrees
WHERE StepTrees.Name = 'ALFKI'
UNION ALL
SELECT 2,
1,
Null,
Steps.Name,
NULL
FROM Steps
JOIN StepTrees ON Steps.StepTreeId = StepTrees.Id
WHERE StepTrees.Name = 'ALFKI'
UNION ALL
SELECT DISTINCT 3,
2,
Null,
Steps.Name,
Results.id
FROM StepTrees
JOIN Steps ON Steps.StepTreeId = StepTrees.Id
JOIN Results ON Steps.StepId = Results.StepId
ORDER BY [Step!2!Name],[Result!3!id]
FOR XML EXPLICIT
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