I am trying to add a Trace to an OQL Query as mentioned in the docs, using GemfireTemplate query method. But the OQL validation fails with QueryInvalidException "unexpected tokern: <". Any ideas?
Using HINT and TRACE with GemfireTemplate.query method
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This is not a bug with SDG's
GemfireTemplate, nor a problem with SDG in general.There are 2 ways to query in GemFire/Geode.
First, is to use the
QueryService, which can be obtained from the cache. Alternatively, you can obtai theQueryServicefrom theClientCacheor even from thePoolattached to theRegionon which you are running the OQL query. This is all handled for you automatically when using SDG's Repository abstraction extension.The second way to query a
Regionis to pass a query "PREDICATE" to theRegion.query(:String)method.Which GemFire/Geode API do you think the
GemfireTemplate.query(:String)method is using?GemfireTemplate.query(:String)uses theRegion.query(:String)API.The
GemfireTemplate.find(:String)method uses theQueryService.Only the
QueryServicecan accept fully valid OQL queries, e.g.<TRACE> SELECT * FROM /SomeRegion WHERE id = 1, where as theRegion.query(:String)method ONLY accepts the OQL Query PREDICATE, i.e.id = 1.Any other OQL Query reserved words or query syntax in general, passed to the
GemfireTemplate.query(:String)method (and by extensionRegion.query(:String)API) results in a invalid OQL Query.If you want to pass
<HINT 'IDIndex', ...> <TRACE> SELECT * FROM /SomeRegion WHERE id = 1 AND ..., then you should callGemfireTemplate.find(:String), which uses the GemFire/GeodeQueryServicethat accepts the complete OQL Query syntax.Alternatively, you can use the Spring Data for Apache Geode (or VMware Tanzu GemFire) Repository extension.
It is even still possible to add HINTS, TRACES, LIMITS or other query facilities to derived Repository query methods as well as query methods annotated with
@Query. See the documentation for more details.