Examples of org.datanucleus.store.mapped.DatastoreElementContainer

org.datanucleus.store.mapped.DatastoreElementContainer
Class representing a container of elements (collection/array) mapped in a datastore (join table).

                    {
                        // N-1 bidirectional join table relation
                        // Add left outer join from {sourceTable}.ID to {joinTable}.ELEM_FK
                        DatastoreContainerObject joinTable =
                            storeMgr.getDatastoreContainerObject(relatedMmds[0]);
                        DatastoreElementContainer collTable = (DatastoreElementContainer)joinTable;
                        JavaTypeMapping selectMapping = collTable.getOwnerMapping();
                        SQLTable joinSqlTbl = null;
                        if (stmt.getPrimaryTable().getTable() != joinTable)
                        {
                            // Join to the join table
                            JavaTypeMapping referenceMapping = collTable.getElementMapping();
                            joinSqlTbl = stmt.leftOuterJoin(sourceSqlTbl,
                                sourceSqlTbl.getTable().getIdMapping(),
                                collTable, null, referenceMapping, null, tableGroupName);
                        }
                        else

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                    // Join table relation - only allows for Collection/Array
                    // Create an expression this table to the join table on the element id, selecting the owner id
                    DatastoreContainerObject targetTable = srm.getDatastoreContainerObject(relatedMmds[0]);
                    JavaTypeMapping refMapping = null;
                    JavaTypeMapping selectMapping = null;
                    DatastoreElementContainer elementTable = (DatastoreElementContainer)targetTable;
                    refMapping = elementTable.getElementMapping();
                    selectMapping = elementTable.getOwnerMapping();
                    DatastoreIdentifier targetTableIdentifier =
                        srm.getIdentifierFactory().newIdentifier(IdentifierType.TABLE, "JOINTABLE" + mmd.getAbsoluteFieldNumber());
                    LogicSetExpression targetTe = qs.newTableExpression(targetTable, targetTableIdentifier);
                    return new ObjectExpression(qs, this, te, refMapping, targetTe, selectMapping);
                }

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            }


            if (mainTable instanceof DatastoreElementContainer)
            {
                // collection/array - element mapping
                DatastoreElementContainer join = (DatastoreElementContainer)mainTable;
                JavaTypeMapping m = join.getElementMapping();
                if (m instanceof EmbeddedElementPCMapping)
                {
                    JavaTypeMapping fieldMapping = ((EmbeddedMapping)m).getJavaTypeMapping(fld);
                    if (fieldMapping != null)
                    {
                        return fieldMapping.newScalarExpression(qs, this);
                    }
                    else
                    {
                        throw new NucleusUserException("'" + fieldName + "' was not found as a field stored in the join table " + mainTable);
                    }
                }
            }
            else if (mainTable instanceof DatastoreMap)
            {
                // Check for a key field first
                DatastoreMap join = (DatastoreMap)mainTable;
                JavaTypeMapping m = join.getKeyMapping();
                if (m instanceof EmbeddedKeyPCMapping)
                {
                    JavaTypeMapping fieldMapping = ((EmbeddedMapping)m).getJavaTypeMapping(fld);
                    if (fieldMapping != null)
                    {
                        return fieldMapping.newScalarExpression(qs, this);
                    }
                }


                // Check for a value field next
                m = join.getValueMapping();
                if (m instanceof EmbeddedValuePCMapping)
                {
                    JavaTypeMapping fieldMapping = ((EmbeddedMapping)m).getJavaTypeMapping(fld);
                    if (fieldMapping != null)
                    {

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                {
                    // 1-N bidirectional join table relation
                    // Do a LEFT OUTER JOIN to the join table to pick up the value.
                    MappedStoreManager storeMgr = qs.getStoreManager();
                    DatastoreContainerObject joinTable = storeMgr.getDatastoreContainerObject(relatedMmds[0]);
                    DatastoreElementContainer collTable = (DatastoreElementContainer)joinTable;
                    JavaTypeMapping referenceMapping = collTable.getElementMapping();
                    JavaTypeMapping selectMapping = collTable.getOwnerMapping();


                    DatastoreContainerObject mainTable = qs.getMainTableExpression().getMainTable();
                    if (!mainTable.equals(joinTable))
                    {
                        // Statement selects the element table and the owner column should be selected

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Related Classes of org.datanucleus.store.mapped.DatastoreElementContainer

org.datanucleus.store.mapped.expression.ExpressionHelper

org.datanucleus.store.mapped.expression.LogicSetExpression

org.datanucleus.store.mapped.mapping.PersistenceCapableMapping

org.datanucleus.store.rdbms.sql.SQLStatementHelper

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