Examples of PreparedQuery

com.cfinkel.reports.wrappers.PreparedQuery

$Author: charles $ $Revision: 8904 $ $Date: 2006-05-01 18:02:06 -0400 (Mon, 01 May 2006) $

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com.google.appengine.api.datastore.PreparedQuery

org.apache.openjpa.kernel.PreparedQuery

A prepared query associates a compiled query to a parsed state that can be executed possibly with more efficiency. An obvious example is to associate a compiled query to an executable SQL string. The query expressed in target language can be executed directly bypassing the critical translation cost to the data store target language on every execution. As the subsequent execution of a cached query will bypass normal query compilation, the post-compilation state of the original query is captured by this receiver to be transferred to the executable query instance. This receiver must not hold any context-sensitive reference or dependency. Because the whole idea of preparing a query (for a cost) is to be able to execute the same logical query in different persistence contexts. However, a prepared query may not be valid when some parameters of execution context such as lock group or fetch plan changes in a way that will change the target query. Refer to {@link PreparedQueryCache} for invalidation mechanism onpossible actions under such circumstances. The query execution model does account for context changes that do not impact the target query e.g. bind variables. @author Pinaki Poddar @since 2.0.0

            // We need
            if (query != null && _convertPositionalParams && JPQLParser.LANG_JPQL.equals(language)) {
                query = query.replaceAll("[\\?]", "\\:_");
            }
            String qid = query;
            PreparedQuery pq = JPQLParser.LANG_JPQL.equals(language)
                ? getPreparedQuery(qid) : null;
            org.apache.openjpa.kernel.Query q = (pq == null || !pq.isInitialized())
                ? _broker.newQuery(language, query)
                : _broker.newQuery(pq.getLanguage(), pq);
            // have to validate JPQL according to spec
            if (pq == null && JPQLParser.LANG_JPQL.equals(language))
                q.compile(); 
            if (pq != null) {
                pq.setInto(q);
            }
            return newQueryImpl(q, null).setId(qid);
        } catch (RuntimeException re) {
            throw PersistenceExceptions.toPersistenceException(re);
        }

            QueryMetaData meta = _broker.getConfiguration().
                getMetaDataRepositoryInstance().getQueryMetaData(null, name,
                _broker.getClassLoader(), true);
            String qid = meta.getQueryString();
            
            PreparedQuery pq = JPQLParser.LANG_JPQL.equals(meta.getLanguage()) ? getPreparedQuery(qid) : null;
            org.apache.openjpa.kernel.Query del =
                (pq == null || !pq.isInitialized()) ? _broker.newQuery(meta.getLanguage(), meta.getQueryString())
                    : _broker.newQuery(pq.getLanguage(), pq);
            
            if (pq != null) {
                pq.setInto(del);
            } else {
                meta.setInto(del);
                del.compile();
            }

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Examples of PreparedQuery

Examples of org.apache.openjpa.kernel.PreparedQuery

Examples of org.apache.openjpa.kernel.PreparedQuery