Examples of org.apache.openjpa.jdbc.schema.ForeignKey

org.apache.openjpa.jdbc.schema.ForeignKey
Represents a database foreign key; may be a logical key with no database representation. This class can also represent a partial key, aligning with {@link DatabaseMetaData}. @author Abe White

    }


    public void initialize() {
        field.setUsesIntermediate(true);


        ForeignKey fk = field.getForeignKey();
        if (fk == null)
            _fkOid = Boolean.TRUE;
        else if (field.getJoinDirection() != FieldMapping.JOIN_INVERSE)
            _fkOid = field.getTypeMapping().isForeignKeyObjectId(fk);
    }

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            // if our foreign key has a delete action, we need to set the
            // related object so constraints can be evaluated
            OpenJPAStateManager rel = RelationStrategies.getStateManager
                (sm.fetchObjectField(field.getIndex()), store.getContext());
            if (rel != null) {
                ForeignKey fk = field.getForeignKey((ClassMapping)
                    rel.getMetaData());
                if (fk.getDeleteAction() == ForeignKey.ACTION_RESTRICT) {
                    Row row = field.getRow(sm, store, rm, Row.ACTION_DELETE);
                    row.setForeignKey(fk, null, rel);
                }
            }
        }

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    private void nullInverse(OpenJPAStateManager sm, RowManager rm)
        throws SQLException {
        if (field.getUseClassCriteria())
            return;


        ForeignKey fk = field.getForeignKey();
        ColumnIO io = field.getColumnIO();
        if (!io.isAnyUpdatable(fk, true))
            return;


        // null inverse if not already enforced by fk
        if (field.getIndependentTypeMappings().length != 1)
            throw RelationStrategies.uninversable(field);
        Row row = rm.getAllRows(fk.getTable(), Row.ACTION_UPDATE);
        row.setForeignKey(fk, io, null);
        row.whereForeignKey(fk, sm);
        rm.flushAllRows(row);
    }

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        JDBCStore store, RowManager rm)
        throws SQLException {
        if (rel == null)
            return;


        ForeignKey fk = field.getForeignKey();
        ColumnIO io = field.getColumnIO();


        int action;
        if (rel.isNew() && !rel.isFlushed()) {
            if (sm.isDeleted() || !io.isAnyInsertable(fk, false))

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            joins = join(joins, false);
            joins = setEmbeddedVariable(joins);
        }


        // and join into relation
        ForeignKey fk = field.getForeignKey(cls);
        if (!forceInner && field.getNullValue() != FieldMapping.NULL_EXCEPTION)
            return joins.outerJoinRelation(field.getName(), fk, field.
                getTypeMapping(), field.getSelectSubclasses(), inverse, false);
        return joins.joinRelation(field.getName(), fk, field.getTypeMapping(), 
            field.getSelectSubclasses(), inverse, false);

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        if (empty)
            sql.append("0 = ");
        else
            sql.append("0 < ");


        ForeignKey fk = field.getForeignKey();
        ContainerFieldStrategy.appendJoinCount(sql, sel, joins, dict, field,
            fk);
    }

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     * Create a faux foreign key that translates between the columns to pull
     * the data from and our related type's primary key columns.
     */
    private ForeignKey createTranslatingForeignKey(ClassMapping relmapping,
        Column[] gcols, ForeignKey gfk) {
        ForeignKey fk = field.getForeignKey(); 
        Column[] cols = fk.getColumns();


        ForeignKey tfk = null;
        Column tcol;
        for (int i = 0; i < gcols.length; i++) {
            tcol = gcols[i];
            if (gfk != null)
                tcol = gfk.getColumn(tcol);
            if (tfk == null)
                tfk = new ForeignKey(null, tcol.getTable());
            tfk.join(tcol, fk.getPrimaryKeyColumn(cols[i]));
        }
        return tfk;
    }

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            default:
                vm = src;
        }
        if (vm.getJoinDirection() != ValueMapping.JOIN_FORWARD)
            return false;
        ForeignKey fk = vm.getForeignKey();
        if (fk == null)
            return false; 
        
        // foreign key must join to target columns
        Column[] rels = fk.getColumns();
        Column[] pks = target.getColumns(); 
        if (rels.length != pks.length)
            return false;
        for (int i = 0; i < rels.length; i++)
            if (fk.getPrimaryKeyColumn(rels[i]) != pks[i])
                return false;
        return true;
    }

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        ClassMapping[] clss = strat.getIndependentValueMappings(true);
        if (clss != null && clss.length > 1)
            throw RelationStrategies.unjoinable(field);


        ClassMapping cls = (clss.length == 0) ? null : clss[0];
        ForeignKey fk = strat.getJoinForeignKey(cls);


        // manually create a subselect for the Map's value
        sql.append("(SELECT ");
        Column[] values = field.getElementMapping().getColumns();
        for (int i = 0; i < values.length; i++) {

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     * key that matches the primary key, return it. Else return null.
     */
    public ForeignKey getUniqueForeignKey(Table table) {
        ForeignKey[] fks = table.getForeignKeys();
        PrimaryKey pk = table.getPrimaryKey();
        ForeignKey unq = null;
        int count = 0;
        for (int i = 0; i < fks.length; i++) {
            if (pk != null && pk.columnsMatch(fks[i].getColumns()))
                return fks[i];
            if (!isUnique(fks[i]))

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