Examples of org.datanucleus.store.rdbms.sql.expression.SQLExpression$ColumnExpressionList

Package org.datanucleus.store.rdbms.sql.expression

Examples of org.datanucleus.store.rdbms.sql.expression.SQLExpression$ColumnExpressionList

org.datanucleus.store.rdbms.sql.expression.SQLExpression
Base expression for SQL. The principle here is that any expression (be it a field, literal, parameter, variable etc) has a type and so needs a JavaTypeMapping to control reading/writing of that type. An expression will typically have an SQLTable (in the overall statement) that it refers to. A literal will not have an SQLTable since it represents a value. The actual SQL for the expression is embodied in the SQLText field. Construction typically sets the SQL for the respective expression.

            if (args == null || args.size() != 1)
            {
                throw new NucleusException("COUNT is only supported with a single argument");
            }


            SQLExpression argExpr = (SQLExpression)args.get(0);
            if (argExpr.getNumberOfSubExpressions() > 1 && argExpr instanceof ObjectExpression)
            {
                // Just use first sub-expression since count() doesn't allow more
                ((ObjectExpression)argExpr).useFirstColumnOnly();
            }
            return new AggregateNumericExpression(stmt, getMappingForClass(long.class), "COUNT", args);

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        {
            throw new NucleusException(LOCALISER.msg("060016", "get", "MapExpression", 1));
        }


        MapExpression mapExpr = (MapExpression)expr;
        SQLExpression keyValExpr = (SQLExpression)args.get(0);
        if (keyValExpr instanceof UnboundExpression)
        {
            // TODO Add support for unbound variables (as per CollectionContains)
            throw new NucleusException("Dont currently support binding of unbound variables using Map.get");
        }

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            throw new NucleusException("Invalid map for " + mapExpr + " in get() call");
        }


        SQLStatement subStmt = new SQLStatement(stmt, storeMgr, mapTbl, null, null);
        subStmt.setClassLoaderResolver(clr);
        SQLExpression valExpr = exprFactory.newExpression(subStmt, subStmt.getPrimaryTable(), valMapping);
        subStmt.select(valExpr, null);


        // Link to primary statement
        SQLExpression elementOwnerExpr = exprFactory.newExpression(subStmt, subStmt.getPrimaryTable(),
            ownerMapping);
        SQLExpression ownerIdExpr = exprFactory.newExpression(stmt, mapExpr.getSQLTable(),
            mapExpr.getSQLTable().getTable().getIdMapping());
        subStmt.whereAnd(elementOwnerExpr.eq(ownerIdExpr), true);


        // Condition on key
        SQLExpression keyExpr = exprFactory.newExpression(subStmt, subStmt.getPrimaryTable(), keyMapping);
        subStmt.whereAnd(keyExpr.eq(keyValExpr), true);


        SubqueryExpression subExpr = new SubqueryExpression(stmt, subStmt);
        subExpr.setJavaTypeMapping(valMapping);
        return subExpr;
    }

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                // Add join to join table
                SQLTable joinSqlTbl = stmt.innerJoin(mapExpr.getSQLTable(), mapExpr.getSQLTable().getTable().getIdMapping(),
                    joinTbl, null, joinTbl.getOwnerMapping(), null, null);


                // Add condition on key
                SQLExpression keyExpr = exprFactory.newExpression(stmt, joinSqlTbl, joinTbl.getKeyMapping());
                stmt.whereAnd(keyExpr.eq(keyValExpr), true);


                // Return value expression
                if (mapmd.getValueClassMetaData(clr, mmgr) != null)
                {
                    // Persistable value so join to its table
                    DatastoreClass valTable = stmt.getRDBMSManager().getDatastoreClass(mapmd.getValueType(), clr);
                    SQLTable valueSqlTbl = stmt.innerJoin(joinSqlTbl, joinTbl.getValueMapping(),
                        valTable, null, valTable.getIdMapping(), null, null);


                    return exprFactory.newExpression(stmt, valueSqlTbl, valTable.getIdMapping());
                }
                else
                {
                    // Return mapping for the value in the join table
                    SQLExpression valueExpr = exprFactory.newExpression(stmt, joinSqlTbl, joinTbl.getValueMapping());
                    return valueExpr;
                }
            }
            else if (mapmd.getMapType() == MapType.MAP_TYPE_KEY_IN_VALUE)
            {
                // Key stored in value table, so join to value table, add condition on key, and return value
                DatastoreClass valTable = stmt.getRDBMSManager().getDatastoreClass(mapmd.getValueType(), clr);
                AbstractClassMetaData valCmd = mapmd.getValueClassMetaData(clr, mmgr);


                // Add join to value table
                SQLTable valSqlTbl = stmt.innerJoin(mapExpr.getSQLTable(), mapExpr.getSQLTable().getTable().getIdMapping(),
                    valTable, null, valTable.getIdMapping(), null, null);


                // Add condition on key
                String keyFieldName = mmd.getKeyMetaData().getMappedBy();
                AbstractMemberMetaData valKeyMmd = valCmd.getMetaDataForMember(keyFieldName);
                JavaTypeMapping keyMapping = valTable.getMemberMapping(valKeyMmd);
                SQLExpression keyExpr = exprFactory.newExpression(stmt, valSqlTbl, keyMapping);
                stmt.whereAnd(keyExpr.eq(keyValExpr), true);


                // Return value expression
                SQLExpression valueExpr = exprFactory.newExpression(stmt, valSqlTbl, valTable.getIdMapping());
                return valueExpr;
            }
            else if (mapmd.getMapType() == MapType.MAP_TYPE_VALUE_IN_KEY)
            {
                // Value stored in key table, so join to key table, add condition on key, and return value
                DatastoreClass keyTable = stmt.getRDBMSManager().getDatastoreClass(mapmd.getKeyType(), clr);
                AbstractClassMetaData keyCmd = mapmd.getKeyClassMetaData(clr, mmgr);


                // Add join to key table
                SQLTable keySqlTbl = stmt.innerJoin(mapExpr.getSQLTable(), mapExpr.getSQLTable().getTable().getIdMapping(),
                    keyTable, null, keyTable.getIdMapping(), null, null);


                // Add condition on key
                SQLExpression keyExpr = exprFactory.newExpression(stmt, keySqlTbl, keyTable.getIdMapping());
                stmt.whereAnd(keyExpr.eq(keyValExpr), true);


                // Return value expression
                String valueFieldName = mmd.getValueMetaData().getMappedBy();
                AbstractMemberMetaData valKeyMmd = keyCmd.getMetaDataForMember(valueFieldName);
                JavaTypeMapping valueMapping = keyTable.getMemberMapping(valKeyMmd);
                SQLExpression valueExpr = exprFactory.newExpression(stmt, keySqlTbl, valueMapping);
                return valueExpr;
            }
        }
        throw new NucleusException("Map.get() for the filter is not supported for " + mapExpr +
            " with an argument of " + keyValExpr + ". Why not contribute support for it?");

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        {
            throw new NucleusException(LOCALISER.msg("060016", "containsKey", "MapExpression", 1));
        }


        MapExpression mapExpr = (MapExpression)expr;
        SQLExpression keyExpr = (SQLExpression)args.get(0);


        if (keyExpr.isParameter())
        {
            // Key is a parameter so make sure its type is set
            AbstractMemberMetaData mmd = mapExpr.getJavaTypeMapping().getMemberMetaData();
            if (mmd != null && mmd.getMap() != null)
            {
                Class keyCls = stmt.getQueryGenerator().getClassLoaderResolver().classForName(mmd.getMap().getKeyType());
                stmt.getQueryGenerator().bindParameter(keyExpr.getParameterName(), keyCls);
            }
        }


        if (expr instanceof MapLiteral)
        {

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                        keyExpr.getJavaTypeMapping());
                }
                else
                {
                    // Add restrict to key
                    SQLExpression keyIdExpr = exprFactory.newExpression(stmt, joinSqlTbl, mapTbl.getKeyMapping());
                    stmt.whereAnd(keyIdExpr.eq(keyExpr), true);
                }
            }
            else
            {
                if (keyIsUnbound)
                {
                    // Bind the variable in the QueryGenerator
                    keyExpr = exprFactory.newExpression(stmt, joinSqlTbl, mapTbl.getKeyMapping());
                    stmt.getQueryGenerator().bindVariable(varName, keyCmd, keyExpr.getSQLTable(), 
                        keyExpr.getJavaTypeMapping());
                }
                else
                {
                    // Add restrict to key
                    SQLExpression keyIdExpr = exprFactory.newExpression(stmt, joinSqlTbl, mapTbl.getKeyMapping());
                    stmt.whereAnd(keyIdExpr.eq(keyExpr), true);
                }
            }
        }
        else if (mmd.getMap().getMapType() == MapType.MAP_TYPE_KEY_IN_VALUE)
        {
            // Map formed in value table - add join to value table, then to key table
            AbstractClassMetaData valCmd = mmd.getMap().getValueClassMetaData(clr, mmgr);
            DatastoreClass valTbl = storeMgr.getDatastoreClass(valCmd.getFullClassName(), clr);
            AbstractMemberMetaData valKeyMmd =
                valCmd.getMetaDataForMember(mmd.getKeyMetaData().getMappedBy());
            JavaTypeMapping ownerMapping = null;
            if (mmd.getMappedBy() != null)
            {
                ownerMapping = valTbl.getMemberMapping(valCmd.getMetaDataForMember(mmd.getMappedBy()));
            }
            else
            {
                ownerMapping = valTbl.getExternalMapping(mmd, MappingConsumer.MAPPING_TYPE_EXTERNAL_FK);
            }


            SQLTable valSqlTbl = stmt.innerJoin(mapExpr.getSQLTable(), mapExpr.getSQLTable().getTable().getIdMapping(),
                valTbl, null, ownerMapping, null, null);


            if (keyCmd != null)
            {
                DatastoreClass keyTbl = storeMgr.getDatastoreClass(keyCmd.getFullClassName(), clr);
                SQLTable keySqlTbl = stmt.innerJoin(valSqlTbl, valTbl.getMemberMapping(valKeyMmd),
                    keyTbl, keyAlias, keyTbl.getIdMapping(), null, null);


                if (keyIsUnbound)
                {
                    // Bind the variable in the QueryGenerator
                    keyExpr = exprFactory.newExpression(stmt, keySqlTbl, keyTbl.getIdMapping());
                    stmt.getQueryGenerator().bindVariable(varName, keyCmd, keyExpr.getSQLTable(), 
                        keyExpr.getJavaTypeMapping());
                }
                else
                {
                    // Add restrict to key
                    SQLExpression keyIdExpr = exprFactory.newExpression(stmt, keySqlTbl, keyTbl.getIdMapping());
                    stmt.whereAnd(keyIdExpr.eq(keyExpr), true);
                }
            }
            else
            {
                if (keyIsUnbound)
                {
                    // Bind the variable in the QueryGenerator
                    keyExpr = exprFactory.newExpression(stmt, valSqlTbl, valTbl.getMemberMapping(valKeyMmd));
                    stmt.getQueryGenerator().bindVariable(varName, keyCmd, keyExpr.getSQLTable(), 
                        keyExpr.getJavaTypeMapping());
                }
                else
                {
                    // Add restrict to key
                    SQLExpression keyIdExpr = exprFactory.newExpression(stmt, valSqlTbl, valTbl.getMemberMapping(valKeyMmd));
                    stmt.whereAnd(keyIdExpr.eq(keyExpr), true);
                }
            }
        }
        else if (mmd.getMap().getMapType() == MapType.MAP_TYPE_VALUE_IN_KEY)
        {
            // Map formed in key table - add join to key table
            DatastoreClass keyTbl = storeMgr.getDatastoreClass(keyCmd.getFullClassName(), clr);
            JavaTypeMapping ownerMapping = null;
            if (mmd.getMappedBy() != null)
            {
                ownerMapping = keyTbl.getMemberMapping(keyCmd.getMetaDataForMember(mmd.getMappedBy()));
            }
            else
            {
                ownerMapping = keyTbl.getExternalMapping(mmd, MappingConsumer.MAPPING_TYPE_EXTERNAL_FK);
            }
            SQLTable keySqlTbl = stmt.innerJoin(mapExpr.getSQLTable(), mapExpr.getSQLTable().getTable().getIdMapping(),
                keyTbl, keyAlias, ownerMapping, null, null);


            if (keyIsUnbound)
            {
                // Bind the variable in the QueryGenerator
                keyExpr = exprFactory.newExpression(stmt, keySqlTbl, keyTbl.getIdMapping());
                stmt.getQueryGenerator().bindVariable(varName, keyCmd, keyExpr.getSQLTable(), 
                    keyExpr.getJavaTypeMapping());
            }
            else
            {
                // Add restrict to key
                SQLExpression keyIdExpr = exprFactory.newExpression(stmt, keySqlTbl, keyTbl.getIdMapping());
                stmt.whereAnd(keyIdExpr.eq(keyExpr), true);
            }
        }


        JavaTypeMapping m = exprFactory.getMappingForType(boolean.class, true);
        return exprFactory.newLiteral(stmt, m, true).eq(exprFactory.newLiteral(stmt, m, true));

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                JavaTypeMapping oneMapping = storeMgr.getMappingManager().getMapping(Integer.class);
                subStmt.select(exprFactory.newLiteral(subStmt, oneMapping, 1), null);


                // Restrict to map owner
                JavaTypeMapping ownerMapping = ((JoinTable)joinTbl).getOwnerMapping();
                SQLExpression ownerExpr = exprFactory.newExpression(subStmt, subStmt.getPrimaryTable(), ownerMapping);
                SQLExpression ownerIdExpr = exprFactory.newExpression(stmt, mapExpr.getSQLTable(),
                    mapExpr.getSQLTable().getTable().getIdMapping());
                subStmt.whereAnd(ownerExpr.eq(ownerIdExpr), true);


                if (keyIsUnbound)
                {
                    // Bind the variable in the QueryGenerator
                    keyExpr = exprFactory.newExpression(subStmt, subStmt.getPrimaryTable(), joinTbl.getKeyMapping());
                    stmt.getQueryGenerator().bindVariable(varName, keyCmd, keyExpr.getSQLTable(), 
                        keyExpr.getJavaTypeMapping());
                }
                else
                {
                    // Add restrict to key
                    SQLExpression elemIdExpr = exprFactory.newExpression(subStmt, subStmt.getPrimaryTable(),
                        joinTbl.getKeyMapping());
                    subStmt.whereAnd(elemIdExpr.eq(keyExpr), true);
                }
            }
            else
            {
                // Map<PC, ?>
                DatastoreClass keyTbl = storeMgr.getDatastoreClass(mmd.getMap().getKeyType(), clr);
                subStmt = new SQLStatement(stmt, storeMgr, keyTbl, null, null);
                subStmt.setClassLoaderResolver(clr);
                JavaTypeMapping oneMapping = storeMgr.getMappingManager().getMapping(Integer.class);
                subStmt.select(exprFactory.newLiteral(subStmt, oneMapping, 1), null);


                // Join to join table
                SQLTable joinSqlTbl = subStmt.innerJoin(subStmt.getPrimaryTable(), keyTbl.getIdMapping(),
                    joinTbl, null, joinTbl.getKeyMapping(), null, null);


                // Restrict to map owner
                JavaTypeMapping ownerMapping = joinTbl.getOwnerMapping();
                SQLExpression ownerExpr = exprFactory.newExpression(subStmt, joinSqlTbl, ownerMapping);
                SQLExpression ownerIdExpr = exprFactory.newExpression(stmt, mapExpr.getSQLTable(),
                    mapExpr.getSQLTable().getTable().getIdMapping());
                subStmt.whereAnd(ownerExpr.eq(ownerIdExpr), true);


                if (keyIsUnbound)
                {
                    // Bind the variable in the QueryGenerator
                    keyExpr = exprFactory.newExpression(subStmt, subStmt.getPrimaryTable(), keyTbl.getIdMapping());
                    stmt.getQueryGenerator().bindVariable(varName, keyCmd, keyExpr.getSQLTable(),
                        keyExpr.getJavaTypeMapping());
                }
                else
                {
                    // Add restrict to key
                    SQLExpression keyIdExpr = exprFactory.newExpression(subStmt, subStmt.getPrimaryTable(),
                        keyTbl.getIdMapping());
                    subStmt.whereAnd(keyIdExpr.eq(keyExpr), true);
                }
            }
        }
        else if (mmd.getMap().getMapType() == MapType.MAP_TYPE_KEY_IN_VALUE)
        {
            // Key stored in value table
            AbstractClassMetaData valCmd = mmd.getMap().getValueClassMetaData(clr, mmgr);
            DatastoreClass valTbl = storeMgr.getDatastoreClass(mmd.getMap().getValueType(), clr);
            JavaTypeMapping ownerMapping = null;
            if (mmd.getMappedBy() != null)
            {
                ownerMapping = valTbl.getMemberMapping(valCmd.getMetaDataForMember(mmd.getMappedBy()));
            }
            else
            {
                ownerMapping = valTbl.getExternalMapping(mmd, MappingConsumer.MAPPING_TYPE_EXTERNAL_FK);
            }
            AbstractMemberMetaData valKeyMmd =
                valCmd.getMetaDataForMember(mmd.getKeyMetaData().getMappedBy());
            if (keyCmd == null)
            {
                subStmt = new SQLStatement(stmt, storeMgr, valTbl, null, null);
                subStmt.setClassLoaderResolver(clr);
                JavaTypeMapping oneMapping = storeMgr.getMappingManager().getMapping(Integer.class);
                subStmt.select(exprFactory.newLiteral(subStmt, oneMapping, 1), null);


                // Restrict to map owner (on value table)
                SQLExpression ownerExpr = exprFactory.newExpression(subStmt, subStmt.getPrimaryTable(), ownerMapping);
                SQLExpression ownerIdExpr = exprFactory.newExpression(stmt, mapExpr.getSQLTable(),
                    mapExpr.getSQLTable().getTable().getIdMapping());
                subStmt.whereAnd(ownerExpr.eq(ownerIdExpr), true);


                if (keyIsUnbound)
                {
                    // Bind the variable in the QueryGenerator
                    keyExpr = exprFactory.newExpression(subStmt, subStmt.getPrimaryTable(), valTbl.getMemberMapping(valKeyMmd));
                    stmt.getQueryGenerator().bindVariable(varName, keyCmd, keyExpr.getSQLTable(),
                        keyExpr.getJavaTypeMapping());
                }
                else
                {
                    // Add restrict to key
                    JavaTypeMapping keyMapping = valTbl.getMemberMapping(valKeyMmd);
                    SQLExpression elemIdExpr = exprFactory.newExpression(subStmt, subStmt.getPrimaryTable(), keyMapping);
                    subStmt.whereAnd(elemIdExpr.eq(keyExpr), true);
                }
            }
            else
            {
                DatastoreClass keyTbl = storeMgr.getDatastoreClass(mmd.getMap().getKeyType(), clr);
                subStmt = new SQLStatement(stmt, storeMgr, keyTbl, null, null);
                subStmt.setClassLoaderResolver(clr);
                JavaTypeMapping oneMapping = storeMgr.getMappingManager().getMapping(Integer.class);
                subStmt.select(exprFactory.newLiteral(subStmt, oneMapping, 1), null);


                // Join to value table
                SQLTable valSqlTbl = subStmt.innerJoin(subStmt.getPrimaryTable(), keyTbl.getIdMapping(),
                    valTbl, null, valTbl.getMemberMapping(valKeyMmd), null, null);


                // Restrict to map owner (on value table)
                SQLExpression ownerExpr = exprFactory.newExpression(subStmt, valSqlTbl, ownerMapping);
                SQLExpression ownerIdExpr = exprFactory.newExpression(stmt, mapExpr.getSQLTable(),
                    mapExpr.getSQLTable().getTable().getIdMapping());
                subStmt.whereAnd(ownerExpr.eq(ownerIdExpr), true);


                if (keyIsUnbound)
                {
                    // Bind the variable in the QueryGenerator
                    keyExpr = exprFactory.newExpression(subStmt, subStmt.getPrimaryTable(), keyTbl.getIdMapping());
                    stmt.getQueryGenerator().bindVariable(varName, keyCmd, keyExpr.getSQLTable(),
                        keyExpr.getJavaTypeMapping());
                }
                else
                {
                    // Add restrict to key
                    SQLExpression keyIdExpr = exprFactory.newExpression(subStmt, subStmt.getPrimaryTable(),
                        keyTbl.getIdMapping());
                    subStmt.whereAnd(keyIdExpr.eq(keyExpr), true);
                }
            }
        }
        else if (mmd.getMap().getMapType() == MapType.MAP_TYPE_VALUE_IN_KEY)
        {
            DatastoreClass keyTbl = storeMgr.getDatastoreClass(mmd.getMap().getKeyType(), clr);
            JavaTypeMapping ownerMapping = null;
            if (mmd.getMappedBy() != null)
            {
                ownerMapping = keyTbl.getMemberMapping(keyCmd.getMetaDataForMember(mmd.getMappedBy()));
            }
            else
            {
                ownerMapping = keyTbl.getExternalMapping(mmd, MappingConsumer.MAPPING_TYPE_EXTERNAL_FK);
            }


            subStmt = new SQLStatement(stmt, storeMgr, keyTbl, null, null);
            subStmt.setClassLoaderResolver(clr);
            JavaTypeMapping oneMapping = storeMgr.getMappingManager().getMapping(Integer.class);
            subStmt.select(exprFactory.newLiteral(subStmt, oneMapping, 1), null);


            // Restrict to map owner (on key table)
            SQLExpression ownerExpr = exprFactory.newExpression(subStmt, subStmt.getPrimaryTable(), ownerMapping);
            SQLExpression ownerIdExpr = exprFactory.newExpression(stmt, mapExpr.getSQLTable(),
                mapExpr.getSQLTable().getTable().getIdMapping());
            subStmt.whereAnd(ownerExpr.eq(ownerIdExpr), true);


            if (keyIsUnbound)
            {
                // Bind the variable in the QueryGenerator
                keyExpr = exprFactory.newExpression(subStmt, subStmt.getPrimaryTable(), keyTbl.getIdMapping());
                stmt.getQueryGenerator().bindVariable(varName, keyCmd, keyExpr.getSQLTable(),
                    keyExpr.getJavaTypeMapping());
            }
            else
            {
                // Add restrict to key
                JavaTypeMapping keyMapping = keyTbl.getIdMapping();
                SQLExpression keyIdExpr = exprFactory.newExpression(subStmt, subStmt.getPrimaryTable(), keyMapping);
                subStmt.whereAnd(keyIdExpr.eq(keyExpr), true);
            }
        }


        return new BooleanSubqueryExpression(stmt, "EXISTS", subStmt);
    }

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        else if (mmd.getOrderMetaData() != null && !mmd.getOrderMetaData().isIndexedList())
        {
            throw new UnsupportedOperationException("Query contains " + expr + ".get(int) yet the field is not an 'indexed' List!");
        }


        SQLExpression idxExpr = (SQLExpression)args.get(0);
        if (idxExpr instanceof SQLLiteral)
        {
            if (!(((SQLLiteral)idxExpr).getValue() instanceof Number))
            {
                throw new UnsupportedOperationException("Query contains " + expr + ".get(int) yet the index is not a numeric literal so not yet supported");

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            }
        }


        SQLStatement subStmt = new SQLStatement(stmt, storeMgr, listTbl, null, null);
        subStmt.setClassLoaderResolver(clr);
        SQLExpression valExpr = exprFactory.newExpression(subStmt, subStmt.getPrimaryTable(), elemMapping);
        subStmt.select(valExpr, null);


        // Link to primary statement
        SQLExpression elementOwnerExpr = exprFactory.newExpression(subStmt, subStmt.getPrimaryTable(),
            ownerMapping);
        SQLExpression ownerIdExpr = exprFactory.newExpression(stmt, listExpr.getSQLTable(),
            listExpr.getSQLTable().getTable().getIdMapping());
        subStmt.whereAnd(elementOwnerExpr.eq(ownerIdExpr), true);


        // Condition on key
        SQLExpression keyExpr = exprFactory.newExpression(subStmt, subStmt.getPrimaryTable(), indexMapping);
        subStmt.whereAnd(keyExpr.eq(idxExpr), true);


        // Create subquery, with mapping being of the element type (since "get" returns an element)
        SubqueryExpression subExpr = new SubqueryExpression(stmt, subStmt);
        subExpr.setJavaTypeMapping(elemMapping);
        return subExpr;

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            // Add join to join table
            SQLTable joinSqlTbl = stmt.innerJoin(listExpr.getSQLTable(), listExpr.getSQLTable().getTable().getIdMapping(),
                joinTbl, null, joinTbl.getOwnerMapping(), null, null);


            // Add condition on index
            SQLExpression idxSqlExpr = exprFactory.newExpression(stmt, joinSqlTbl, joinTbl.getOrderMapping());
            stmt.whereAnd(idxSqlExpr.eq(idxExpr), true);


            // Return element expression
            SQLExpression valueExpr = exprFactory.newExpression(stmt, joinSqlTbl, joinTbl.getElementMapping());
            return valueExpr;
        }
        else
        {
            // FK List
            DatastoreClass elementTbl = storeMgr.getDatastoreClass(mmd.getCollection().getElementType(), clr);


            // Add join to element table
            JavaTypeMapping targetMapping = null;
            JavaTypeMapping orderMapping = null;
            if (relatedMmds != null)
            {
                targetMapping = elementTbl.getMemberMapping(relatedMmds[0]);
                orderMapping = elementTbl.getExternalMapping(mmd, MappingConsumer.MAPPING_TYPE_EXTERNAL_INDEX);
            }
            else
            {
                targetMapping = elementTbl.getExternalMapping(mmd, MappingConsumer.MAPPING_TYPE_EXTERNAL_FK);
                orderMapping = elementTbl.getExternalMapping(mmd, MappingConsumer.MAPPING_TYPE_EXTERNAL_INDEX);
            }
            SQLTable elemSqlTbl = stmt.innerJoin(listExpr.getSQLTable(), listExpr.getSQLTable().getTable().getIdMapping(),
                elementTbl, null, targetMapping, null, null);


            // Add condition on index
            SQLExpression idxSqlExpr = exprFactory.newExpression(stmt, elemSqlTbl, orderMapping);
            stmt.whereAnd(idxSqlExpr.eq(idxExpr), true);


            // Return element expression
            return exprFactory.newExpression(stmt, elemSqlTbl, elementTbl.getIdMapping());
        }
    }

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org.datanucleus.store.rdbms.sql.method.MapGetMethod

org.datanucleus.store.rdbms.sql.method.MathSqrtMethod

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