Examples with JoinListStore org.datanucleus.store.rdbms.scostore.JoinListStore used on opensource projects

Example 1 with JoinListStore

use of org.datanucleus.store.rdbms.scostore.JoinListStore in project datanucleus-rdbms by datanucleus.

the class RDBMSStoreManager method getBackingStoreForField.

/**
 * Accessor for the backing store for the specified member.
 * Note : if we have an embedded object that is embedded into some other type and the object has a member that requires a join table (backing store), this method
 * will not cater for the different places that can be embedded.
 * @param clr The ClassLoaderResolver
 * @param mmd metadata for the member to be persisted by this Store
 * @param type instantiated type or prefered type
 * @return The backing store
 */
public Store getBackingStoreForField(ClassLoaderResolver clr, AbstractMemberMetaData mmd, Class type) {
    if (mmd == null || mmd.isSerialized()) {
        return null;
    }
    Store store = backingStoreByMemberName.get(mmd.getFullFieldName());
    if (store != null) {
        return store;
    }
    synchronized (backingStoreByMemberName) {
        // Just in case we synced just after someone added since our previous lookup above
        store = backingStoreByMemberName.get(mmd.getFullFieldName());
        if (store != null) {
            return store;
        }
        Class expectedMappingType = null;
        if (mmd.getMap() != null) {
            expectedMappingType = MapMapping.class;
        } else if (mmd.getArray() != null) {
            expectedMappingType = ArrayMapping.class;
        } else if (mmd.getCollection() != null) {
            expectedMappingType = CollectionMapping.class;
        } else {
            expectedMappingType = PersistableMapping.class;
        }
        // Validate the mapping type matches the table
        try {
            DatastoreClass ownerTable = getDatastoreClass(mmd.getClassName(), clr);
            if (ownerTable == null) {
                // Class doesn't manage its own table (uses subclass-table, or superclass-table?)
                AbstractClassMetaData fieldTypeCmd = getMetaDataManager().getMetaDataForClass(mmd.getClassName(), clr);
                AbstractClassMetaData[] tableOwnerCmds = getClassesManagingTableForClass(fieldTypeCmd, clr);
                if (tableOwnerCmds != null && tableOwnerCmds.length == 1) {
                    ownerTable = getDatastoreClass(tableOwnerCmds[0].getFullClassName(), clr);
                }
            }
            if (ownerTable != null) {
                JavaTypeMapping m = ownerTable.getMemberMapping(mmd);
                if (!expectedMappingType.isAssignableFrom(m.getClass())) {
                    String requiredType = type != null ? type.getName() : mmd.getTypeName();
                    NucleusLogger.PERSISTENCE.warn("Member " + mmd.getFullFieldName() + " in table=" + ownerTable + " has mapping=" + m + " but expected mapping type=" + expectedMappingType);
                    throw new IncompatibleFieldTypeException(mmd.getFullFieldName(), requiredType, m.getType());
                }
            }
        } catch (NoTableManagedException ntme) {
        // Embedded, so just pass through
        }
        if (mmd.getMap() != null) {
            Table datastoreTable = getTable(mmd);
            if (datastoreTable == null) {
                store = new FKMapStore(mmd, this, clr);
            } else {
                store = new JoinMapStore((MapTable) datastoreTable, clr);
            }
        } else if (mmd.getArray() != null) {
            Table datastoreTable = getTable(mmd);
            if (datastoreTable != null) {
                store = new JoinArrayStore(mmd, (ArrayTable) datastoreTable, clr);
            } else {
                store = new FKArrayStore(mmd, this, clr);
            }
        } else if (mmd.getCollection() != null) {
            Table datastoreTable = getTable(mmd);
            if (type == null) {
                // No type to base it on so create it based on the field declared type
                if (datastoreTable == null) {
                    // We need a "FK" relation
                    if (Set.class.isAssignableFrom(mmd.getType())) {
                        store = new FKSetStore(mmd, this, clr);
                    } else if (List.class.isAssignableFrom(mmd.getType()) || Queue.class.isAssignableFrom(mmd.getType())) {
                        store = new FKListStore(mmd, this, clr);
                    } else if (mmd.getOrderMetaData() != null) {
                        // User has requested ordering
                        store = new FKListStore(mmd, this, clr);
                    } else {
                        store = new FKSetStore(mmd, this, clr);
                    }
                } else {
                    // We need a "JoinTable" relation.
                    if (Set.class.isAssignableFrom(mmd.getType())) {
                        store = new JoinSetStore(mmd, (CollectionTable) datastoreTable, clr);
                    } else if (List.class.isAssignableFrom(mmd.getType()) || Queue.class.isAssignableFrom(mmd.getType())) {
                        store = new JoinListStore(mmd, (CollectionTable) datastoreTable, clr);
                    } else if (mmd.getOrderMetaData() != null) {
                        // User has requested ordering
                        store = new JoinListStore(mmd, (CollectionTable) datastoreTable, clr);
                    } else {
                        store = new JoinSetStore(mmd, (CollectionTable) datastoreTable, clr);
                    }
                }
            } else {
                // Instantiated type specified, so use it to pick the associated backing store
                if (datastoreTable == null) {
                    if (SCOUtils.isListBased(type)) {
                        // List required
                        store = new FKListStore(mmd, this, clr);
                    } else {
                        // Set required
                        store = new FKSetStore(mmd, this, clr);
                    }
                } else {
                    if (SCOUtils.isListBased(type)) {
                        // List required
                        store = new JoinListStore(mmd, (CollectionTable) datastoreTable, clr);
                    } else {
                        // Set required
                        store = new JoinSetStore(mmd, (CollectionTable) datastoreTable, clr);
                    }
                }
            }
        } else {
            store = new JoinPersistableRelationStore(mmd, (PersistableJoinTable) getTable(mmd), clr);
        }
        backingStoreByMemberName.put(mmd.getFullFieldName(), store);
        return store;
    }
}

Example 2 with JoinListStore

use of org.datanucleus.store.rdbms.scostore.JoinListStore in project datanucleus-rdbms by datanucleus.

the class BulkFetchExistsHandler method getStatementToBulkFetchField.

/**
 * Convenience method to generate a bulk-fetch statement for the specified multi-valued field of the owning query.
 * @param candidateCmd Metadata for the candidate
 * @param parameters Parameters for the query
 * @param mmd Metadata for the multi-valued field
 * @param datastoreCompilation The datastore compilation of the query
 * @param mapperOptions Any options for the query to SQL mapper
 * @return The bulk-fetch statement for retrieving this multi-valued field.
 */
public IteratorStatement getStatementToBulkFetchField(AbstractClassMetaData candidateCmd, AbstractMemberMetaData mmd, Query query, Map parameters, RDBMSQueryCompilation datastoreCompilation, Set<String> mapperOptions) {
    IteratorStatement iterStmt = null;
    ExecutionContext ec = query.getExecutionContext();
    ClassLoaderResolver clr = ec.getClassLoaderResolver();
    RDBMSStoreManager storeMgr = (RDBMSStoreManager) query.getStoreManager();
    Store backingStore = storeMgr.getBackingStoreForField(clr, mmd, null);
    if (backingStore instanceof JoinSetStore || backingStore instanceof JoinListStore || backingStore instanceof JoinArrayStore) {
        // Set/List/array using join-table : Generate an iterator query of the form
        if (backingStore instanceof JoinSetStore) {
            iterStmt = ((JoinSetStore) backingStore).getIteratorStatement(ec, ec.getFetchPlan(), false);
        } else if (backingStore instanceof JoinListStore) {
            iterStmt = ((JoinListStore) backingStore).getIteratorStatement(ec, ec.getFetchPlan(), false, -1, -1);
        } else if (backingStore instanceof JoinArrayStore) {
            iterStmt = ((JoinArrayStore) backingStore).getIteratorStatement(ec, ec.getFetchPlan(), false);
        } else {
            throw new NucleusUserException("We do not support BulkFetch using EXISTS for backingStore = " + backingStore);
        }
        // SELECT ELEM_TBL.COL1, ELEM_TBL.COL2, ... FROM JOIN_TBL INNER_JOIN ELEM_TBL WHERE JOIN_TBL.ELEMENT_ID = ELEM_TBL.ID
        // AND EXISTS (SELECT OWNER_TBL.ID FROM OWNER_TBL WHERE (queryWhereClause) AND JOIN_TBL.OWNER_ID = OWNER_TBL.ID)
        SelectStatement sqlStmt = iterStmt.getSelectStatement();
        JoinTable joinTbl = (JoinTable) sqlStmt.getPrimaryTable().getTable();
        JavaTypeMapping joinOwnerMapping = joinTbl.getOwnerMapping();
        // Generate the EXISTS subquery (based on the JDOQL/JPQL query)
        SelectStatement existsStmt = RDBMSQueryUtils.getStatementForCandidates(storeMgr, sqlStmt, candidateCmd, datastoreCompilation.getResultDefinitionForClass(), ec, query.getCandidateClass(), query.isSubclasses(), query.getResult(), null, null, null);
        Set<String> options = new HashSet<>();
        if (mapperOptions != null) {
            options.addAll(mapperOptions);
        }
        options.add(QueryToSQLMapper.OPTION_SELECT_CANDIDATE_ID_ONLY);
        QueryToSQLMapper sqlMapper = new QueryToSQLMapper(existsStmt, query.getCompilation(), parameters, null, null, candidateCmd, query.isSubclasses(), query.getFetchPlan(), ec, query.getParsedImports(), options, query.getExtensions());
        sqlMapper.compile();
        // Add EXISTS clause on iterator statement so we can restrict to just the owners in this query
        // ORDER BY in EXISTS is forbidden by some RDBMS
        existsStmt.setOrdering(null, null);
        BooleanExpression existsExpr = new BooleanSubqueryExpression(sqlStmt, "EXISTS", existsStmt);
        sqlStmt.whereAnd(existsExpr, true);
        // Join to outer statement so we restrict to collection elements for the query candidates
        SQLExpression joinTblOwnerExpr = sqlStmt.getRDBMSManager().getSQLExpressionFactory().newExpression(sqlStmt, sqlStmt.getPrimaryTable(), joinOwnerMapping);
        SQLExpression existsOwnerExpr = sqlStmt.getRDBMSManager().getSQLExpressionFactory().newExpression(existsStmt, existsStmt.getPrimaryTable(), existsStmt.getPrimaryTable().getTable().getIdMapping());
        existsStmt.whereAnd(joinTblOwnerExpr.eq(existsOwnerExpr), true);
        // Select the owner candidate so we can separate the collection elements out to their owner
        int[] ownerColIndexes = sqlStmt.select(joinTblOwnerExpr, null);
        StatementMappingIndex ownerMapIdx = new StatementMappingIndex(existsStmt.getPrimaryTable().getTable().getIdMapping());
        ownerMapIdx.setColumnPositions(ownerColIndexes);
        iterStmt.setOwnerMapIndex(ownerMapIdx);
    } else if (backingStore instanceof FKSetStore || backingStore instanceof FKListStore || backingStore instanceof FKArrayStore) {
        if (backingStore instanceof FKSetStore) {
            iterStmt = ((FKSetStore) backingStore).getIteratorStatement(ec, ec.getFetchPlan(), false);
        } else if (backingStore instanceof FKListStore) {
            iterStmt = ((FKListStore) backingStore).getIteratorStatement(ec, ec.getFetchPlan(), false, -1, -1);
        } else if (backingStore instanceof FKArrayStore) {
            iterStmt = ((FKArrayStore) backingStore).getIteratorStatement(ec, ec.getFetchPlan(), false);
        } else {
            throw new NucleusUserException("We do not support BulkFetch using EXISTS for backingStore = " + backingStore);
        }
        // Set/List/array using foreign-key : Generate an iterator query of the form
        // SELECT ELEM_TBL.COL1, ELEM_TBL.COL2, ... FROM ELEM_TBL
        // WHERE EXISTS (SELECT OWNER_TBL.ID FROM OWNER_TBL WHERE (queryWhereClause) AND ELEM_TBL.OWNER_ID = OWNER_TBL.ID)
        SelectStatement sqlStmt = iterStmt.getSelectStatement();
        // Generate the EXISTS subquery (based on the JDOQL/JPQL query)
        SelectStatement existsStmt = RDBMSQueryUtils.getStatementForCandidates(storeMgr, sqlStmt, candidateCmd, datastoreCompilation.getResultDefinitionForClass(), ec, query.getCandidateClass(), query.isSubclasses(), query.getResult(), null, null, null);
        Set<String> options = new HashSet<>();
        if (mapperOptions != null) {
            options.addAll(mapperOptions);
        }
        options.add(QueryToSQLMapper.OPTION_SELECT_CANDIDATE_ID_ONLY);
        QueryToSQLMapper sqlMapper = new QueryToSQLMapper(existsStmt, query.getCompilation(), parameters, null, null, candidateCmd, query.isSubclasses(), query.getFetchPlan(), ec, query.getParsedImports(), options, query.getExtensions());
        sqlMapper.compile();
        // Add EXISTS clause on iterator statement so we can restrict to just the owners in this query
        // ORDER BY in EXISTS is forbidden by some RDBMS
        existsStmt.setOrdering(null, null);
        BooleanExpression existsExpr = new BooleanSubqueryExpression(sqlStmt, "EXISTS", existsStmt);
        sqlStmt.whereAnd(existsExpr, true);
        // Join to outer statement so we restrict to collection elements for the query candidates
        SQLExpression elemTblOwnerExpr = sqlStmt.getRDBMSManager().getSQLExpressionFactory().newExpression(sqlStmt, sqlStmt.getPrimaryTable(), ((BaseContainerStore) backingStore).getOwnerMapping());
        SQLExpression existsOwnerExpr = sqlStmt.getRDBMSManager().getSQLExpressionFactory().newExpression(existsStmt, existsStmt.getPrimaryTable(), existsStmt.getPrimaryTable().getTable().getIdMapping());
        existsStmt.whereAnd(elemTblOwnerExpr.eq(existsOwnerExpr), true);
        // Select the owner candidate so we can separate the collection elements out to their owner
        int[] ownerColIndexes = sqlStmt.select(elemTblOwnerExpr, null);
        StatementMappingIndex ownerMapIdx = new StatementMappingIndex(existsStmt.getPrimaryTable().getTable().getIdMapping());
        ownerMapIdx.setColumnPositions(ownerColIndexes);
        iterStmt.setOwnerMapIndex(ownerMapIdx);
    }
    return iterStmt;
}

Example 3 with JoinListStore

use of org.datanucleus.store.rdbms.scostore.JoinListStore in project datanucleus-rdbms by datanucleus.

the class BulkFetchJoinHandler method getStatementToBulkFetchField.

/**
 * Convenience method to generate a bulk-fetch statement for the specified multi-valued field of the owning query.
 * @param candidateCmd Metadata for the candidate
 * @param mmd Metadata for the member we are bulk-fetching the value(s) for
 * @param query The query
 * @param parameters Parameters for the query
 * @param datastoreCompilation The datastore compilation of the query
 * @param mapperOptions Any mapper options for query generation
 * @return The statement to use for bulk fetching, together with mappings for extracting the results of the elements
 */
public IteratorStatement getStatementToBulkFetchField(AbstractClassMetaData candidateCmd, AbstractMemberMetaData mmd, Query query, Map parameters, RDBMSQueryCompilation datastoreCompilation, Set<String> mapperOptions) {
    ExecutionContext ec = query.getExecutionContext();
    ClassLoaderResolver clr = ec.getClassLoaderResolver();
    RDBMSStoreManager storeMgr = (RDBMSStoreManager) query.getStoreManager();
    Store backingStore = storeMgr.getBackingStoreForField(clr, mmd, null);
    if (backingStore instanceof JoinSetStore || backingStore instanceof JoinListStore || backingStore instanceof JoinArrayStore) {
    // Set/List/array using join-table : Generate an iterator query of the form
    // SELECT ELEM_TBL.COL1, ELEM_TBL.COL2, ... FROM CANDIDATE_TBL T1 INNER JOIN JOIN_TBL T2 ON T2.OWNER_ID = T1.ID INNER_JOIN ELEM_TBL T3 ON T3.ID = T2.ELEM_ID
    // WHERE (queryWhereClause)
    // TODO Start from the original query, and remove any grouping, having, ordering etc, and join to join table + element table.
    } else if (backingStore instanceof FKSetStore || backingStore instanceof FKListStore || backingStore instanceof FKArrayStore) {
    // Set/List/array using foreign-key : Generate an iterator query of the form
    // SELECT ELEM_TBL.COL1, ELEM_TBL.COL2, ... FROM ELEM_TBL
    // WHERE EXISTS (SELECT OWNER_TBL.ID FROM OWNER_TBL WHERE (queryWhereClause) AND ELEM_TBL.OWNER_ID = OWNER_TBL.ID)
    // TODO Start from the original query, and remove any grouping, having, ordering etc, and join to element table.
    }
    throw new NucleusException("BulkFetch via JOIN is not yet implemented");
// return iterStmt;
}