org.datanucleus.store.rdbms.query

Interface BulkFetchHandler

All Known Implementing Classes:

BulkFetchExistsHandler, BulkFetchJoinHandler

public interface BulkFetchHandler

Interface for a handler for "bulk fetch" of a multi-valued field from a query.

Method Summary

Modifier and Type	Method and Description
static void	applyParametersToStatement(org.datanucleus.ExecutionContext ec, PreparedStatement ps, RDBMSQueryCompilation datastoreCompilation, SQLStatement sqlStmt, Map parameters) Convenience method to apply the passed parameters to the provided bulk-fetch statement.
IteratorStatement	getStatementToBulkFetchField(org.datanucleus.metadata.AbstractClassMetaData candidateCmd, org.datanucleus.metadata.AbstractMemberMetaData mmd, org.datanucleus.store.query.Query query, Map parameters, RDBMSQueryCompilation datastoreCompilation, Set<String> mapperOptions) Method to return the bulk-fetch statement (and its associated mappings for extracting the results).

Method Detail

getStatementToBulkFetchField

IteratorStatement getStatementToBulkFetchField(org.datanucleus.metadata.AbstractClassMetaData candidateCmd,
                                               org.datanucleus.metadata.AbstractMemberMetaData mmd,
                                               org.datanucleus.store.query.Query query,
                                               Map parameters,
                                               RDBMSQueryCompilation datastoreCompilation,
                                               Set<String> mapperOptions)

Method to return the bulk-fetch statement (and its associated mappings for extracting the results).

Parameters:

candidateCmd - Metadata for the candidate

mmd - Metadata for the member we are bulk-fetching the value(s) for

query - The query

parameters - Parameters for the query

datastoreCompilation - The datastore compilation of the query

mapperOptions - Any mapper options for query generation

Returns:

The statement to use for bulk fetching, together with mappings for extracting the results of the elements

applyParametersToStatement

static void applyParametersToStatement(org.datanucleus.ExecutionContext ec,
                                       PreparedStatement ps,
                                       RDBMSQueryCompilation datastoreCompilation,
                                       SQLStatement sqlStmt,
                                       Map parameters)

Convenience method to apply the passed parameters to the provided bulk-fetch statement. Takes care of applying parameters across any UNIONs of elements.

Parameters:

ec - ExecutionContext

ps - PreparedStatement

datastoreCompilation - The datastore compilation for the query itself

sqlStmt - The bulk-fetch iterator statement

parameters - The map of parameters passed in to the query