Examples of org.apache.cayenne.map.DbRelationship

org.apache.cayenne.map.DbRelationship
A DbRelationship is a descriptor of a database inter-table relationship based on one or more primary key/foreign key pairs. @author Misha Shengaout @author Andrus Adamchik


                    // if value not modified, update it from snapshot,
                    // otherwise leave it alone
                    if (!isToOneTargetModified(property, object, diff)) {


                        DbRelationship dbRelationship = relationship
                                .getDbRelationships()
                                .get(0);


                        // must check before creating ObjectId because of partial
                        // snapshots

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            throw new CayenneRuntimeException(
                    "Only single-step flattened relationships are supported in this operation: "
                            + relationship);
        }


        DbRelationship firstDbRel = relList.get(0);
        return (DbEntity) firstDbRel.getTargetEntity();
    }

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            throw new CayenneRuntimeException(
                    "Only single-step flattened relationships are supported in this operation: "
                            + relationship);
        }


        DbRelationship firstDbRel = relList.get(0);
        DbRelationship secondDbRel = relList.get(1);


        Map<String, ?> sourceId = this.sourceId.getIdSnapshot();
        Map<String, ?> destinationId = this.destinationId.getIdSnapshot();


        Map<String, Object> snapshot = new HashMap<String, Object>(sourceId.size()
                + destinationId.size(), 1);
        for (DbJoin join : firstDbRel.getJoins()) {
            snapshot.put(join.getTargetName(), sourceId.get(join.getSourceName()));
        }


        for (DbJoin join : secondDbRel.getJoins()) {
            snapshot.put(join.getSourceName(), destinationId.get(join.getTargetName()));
        }


        return snapshot;
    }

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            throw new CayenneRuntimeException(
                    "Only single-step flattened relationships are supported in this operation: "
                            + relationship);
        }


        DbRelationship firstDbRel = relList.get(0);
        DbRelationship secondDbRel = relList.get(1);


        List<DbJoin> fromSourceJoins = firstDbRel.getJoins();
        List<DbJoin> toTargetJoins = secondDbRel.getJoins();


        Map<String, Object> snapshot = new HashMap<String, Object>(fromSourceJoins.size()
                + toTargetJoins.size(), 1);


        for (int i = 0, numJoins = fromSourceJoins.size(); i < numJoins; i++) {

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                return !DONE;
            }


            // we can assume that there is one and only one DbRelationship as
            // we previously checked that "!isSourceIndependentFromTargetChange"
            DbRelationship dbRelationship = relationship.getDbRelationships().get(0);


            ObjectId targetId = sourceRow.createTargetObjectId(relationship
                    .getTargetEntityName(), dbRelationship);


            // null id means that FK is null...

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                                "No matching objects found for ObjectId "
                                        + object.getObjectId()
                                        + ". Object may have been deleted externally.");
                    }


                    DbRelationship dbRel = rel.getDbRelationships().get(0);
                    for (DbJoin join : dbRel.getJoins()) {
                        String key = join.getSourceName();
                        snapshot.put(key, storedSnapshot.get(key));
                    }


                    return true;
                }


                // target is resolved and we have an FK->PK to it,
                // so extract it from target...
                Persistent target = (Persistent) targetObject;
                Map<String, Object> idParts = target.getObjectId().getIdSnapshot();


                // this may happen in uncommitted objects - see the warning in the JavaDoc
                // of
                // this method.
                if (idParts.isEmpty()) {
                    return true;
                }


                DbRelationship dbRel = rel.getDbRelationships().get(0);
                Map<String, Object> fk = dbRel.srcFkSnapshotWithTargetSnapshot(idParts);
                snapshot.putAll(fk);
                return true;
            }
        });

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        if (joinRelationships.isEmpty()) {
            throw new EJBQLException("No join configured for id " + rhsId);
        }


        // TODO: andrus, 4/8/2007 - support for flattened relationships
        DbRelationship incomingDB = joinRelationships.get(0);


        // TODO: andrus, 1/6/2008 - move reusable join check here...


        Entity sourceEntity = incomingDB.getSourceEntity();
        String tableName;


        if (sourceEntity instanceof DbEntity) {
           tableName = ((DbEntity) sourceEntity).getFullyQualifiedName();
        } else {
           tableName = sourceEntity.getName();
        }


        String sourceAlias = context.getTableAlias(lhsId.getEntityId(), tableName);


        if (marker != null) {
            context.pushMarker(marker, false);
        }


        try {


            context.append(" ").append(semantics);
            String targetAlias = appendTable(rhsId);
            context.append(" ON (");


            Iterator<DbJoin> it = incomingDB.getJoins().iterator();
            if (it.hasNext()) {
                DbJoin dbJoin = it.next();
                context
                        .append(sourceAlias)
                        .append('.')

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            // use an outer join for to-many matches
            resolveJoin(false);


            // TODO: andrus, 6/21/2007 - flattened support
            DbRelationship dbRelationship = relationship.getDbRelationships().get(0);
            DbEntity table = (DbEntity) dbRelationship.getTargetEntity();


            String alias = this.lastAlias != null ? lastAlias : context.getTableAlias(
                    idPath,
                    table.getFullyQualifiedName());


            Collection<DbAttribute> pks = table.getPrimaryKeys();


            if (pks.size() == 1) {
                DbAttribute pk = pks.iterator().next();
                context.append(' ');
                if (isUsingAliases()) {
                    context.append(alias).append('.');
                }
                context.append(pk.getName());
            }
            else {
                throw new EJBQLException(
                        "Multi-column PK to-many matches are not yet supported.");
            }
        }
        else {
            // match FK against the target object


            // TODO: andrus, 6/21/2007 - flattened support
            DbRelationship dbRelationship = relationship.getDbRelationships().get(0);
            DbEntity table = (DbEntity) dbRelationship.getSourceEntity();


            String alias = this.lastAlias != null ? lastAlias : context.getTableAlias(
                    idPath,
                    table.getFullyQualifiedName());


            List<DbJoin> joins = dbRelationship.getJoins();


            if (joins.size() == 1) {
                DbJoin join = joins.get(0);
                context.append(' ');
                if (isUsingAliases()) {

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                            joinAppender = context
                                    .getTranslatorFactory()
                                    .getJoinAppender(context);
                        }


                        DbRelationship dr = (DbRelationship) pathPart;


                        EJBQLTableId rhsId = new EJBQLTableId(lhsId, dr.getName());
                        joinAppender.appendOuterJoin(marker, lhsId, rhsId);
                        lhsId = rhsId;
                    }
                    else if (pathPart instanceof DbAttribute) {
                        appendColumn(idVar, oa, (DbAttribute) pathPart, fields, oa
                                .getType());
                    }
                }
                return true;
            }


            public boolean visitToMany(ToManyProperty property) {
                visitRelationship(property);
                return true;
            }


            public boolean visitToOne(ToOneProperty property) {
                visitRelationship(property);
                return true;
            }


            private void visitRelationship(ArcProperty property) {
                ObjRelationship rel = property.getRelationship();
                DbRelationship dbRel = rel.getDbRelationships().get(0);


                for (DbJoin join : dbRel.getJoins()) {
                    DbAttribute src = join.getSource();
                    appendColumn(idVar, null, src, fields);
                }
            }
        };

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                final Map<String, String> fields = xfields;


                Collection<DbAttribute> dbAttr = ((ObjEntity) relationship
                        .getTargetEntity()).getDbEntity().getAttributes();


                DbRelationship dbRelationship = relationship.getDbRelationships().get(0);
                DbEntity table = (DbEntity) dbRelationship.getTargetEntity();


                Iterator<DbAttribute> it = dbAttr.iterator();
                if (dbAttr.size() > 0) {
                    this.resolveJoin(false);
                }

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