Examples of org.h2.constraint.Constraint

org.h2.constraint.Constraint
The base class for constraint checking.

            if (table.isTemporary() && !table.isGlobalTemporary()) {
                session.removeLocalTempTableIndex(index);
                return;
            }
        } else if (type == DbObject.CONSTRAINT) {
            Constraint constraint = (Constraint) obj;
            Table table = constraint.getTable();
            if (table.isTemporary() && !table.isGlobalTemporary()) {
                session.removeLocalTempTableConstraint(constraint);
                return;
            }
        }

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            }
            throw DbException.get(ErrorCode.CONSTRAINT_ALREADY_EXISTS_1, constraintName);
        }
        session.getUser().checkRight(table, Right.ALL);
        table.lock(session, true, true);
        Constraint constraint;
        switch (type) {
        case CommandInterface.ALTER_TABLE_ADD_CONSTRAINT_PRIMARY_KEY: {
            IndexColumn.mapColumns(indexColumns, table);
            index = table.findPrimaryKey();
            ArrayList<Constraint> constraints = table.getConstraints();
            for (int i = 0; constraints != null && i < constraints.size(); i++) {
                Constraint c = constraints.get(i);
                if (Constraint.PRIMARY_KEY.equals(c.getConstraintType())) {
                    throw DbException.get(ErrorCode.SECOND_PRIMARY_KEY);
                }
            }
            if (index != null) {
                // if there is an index, it must match with the one declared

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        while (triggers != null && triggers.size() > 0) {
            TriggerObject obj = (TriggerObject) triggers.values().toArray()[0];
            database.removeSchemaObject(session, obj);
        }
        while (constraints != null && constraints.size() > 0) {
            Constraint obj = (Constraint) constraints.values().toArray()[0];
            database.removeSchemaObject(session, obj);
        }
        while (tablesAndViews != null && tablesAndViews.size() > 0) {
            Table obj = (Table) tablesAndViews.values().toArray()[0];
            database.removeSchemaObject(session, obj);

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     * @param session the session
     * @param name the object name
     * @return the object or null
     */
    public Constraint findConstraint(Session session, String name) {
        Constraint constraint = constraints.get(name);
        if (constraint == null) {
            constraint = session.findLocalTempTableConstraint(name);
        }
        return constraint;
    }

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     * @param name the constraint name
     * @return the constraint
     * @throws DbException if no such object exists
     */
    public Constraint getConstraint(String name) {
        Constraint constraint = constraints.get(name);
        if (constraint == null) {
            throw DbException.get(ErrorCode.CONSTRAINT_NOT_FOUND_1, name);
        }
        return constraint;
    }

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    public boolean canTruncate() {
        if (getCheckForeignKeyConstraints() && database.getReferentialIntegrity()) {
            ArrayList<Constraint> constraints = getConstraints();
            if (constraints != null) {
                for (int i = 0, size = constraints.size(); i < size; i++) {
                    Constraint c = constraints.get(i);
                    if (!(c.getConstraintType().equals(Constraint.REFERENTIAL))) {
                        continue;
                    }
                    ConstraintReferential ref = (ConstraintReferential) c;
                    if (ref.getRefTable() == this) {
                        return false;

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    public void rename(String newName) {
        super.rename(newName);
        if (constraints != null) {
            for (int i = 0, size = constraints.size(); i < size; i++) {
                Constraint constraint = constraints.get(i);
                constraint.rebuild();
            }
        }
    }

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            TriggerObject trigger = triggers.get(0);
            triggers.remove(0);
            database.removeSchemaObject(session, trigger);
        }
        while (constraints != null && constraints.size() > 0) {
            Constraint constraint = constraints.get(0);
            constraints.remove(0);
            database.removeSchemaObject(session, constraint);
        }
        for (Right right : database.getAllRights()) {
            if (right.getGrantedTable() == this) {

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     */
    public void dropSingleColumnConstraintsAndIndexes(Session session, Column col) {
        ArrayList<Constraint> constraintsToDrop = New.arrayList();
        if (constraints != null) {
            for (int i = 0, size = constraints.size(); i < size; i++) {
                Constraint constraint = constraints.get(i);
                HashSet<Column> columns = constraint.getReferencedColumns(this);
                if (!columns.contains(col)) {
                    continue;
                }
                if (columns.size() == 1) {
                    constraintsToDrop.add(constraint);
                } else {
                    throw DbException.get(ErrorCode.COLUMN_IS_REFERENCED_1, constraint.getSQL());
                }
            }
        }
        ArrayList<Index> indexesToDrop = New.arrayList();
        ArrayList<Index> indexes = getIndexes();

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    private void fireConstraints(Session session, Row oldRow, Row newRow, boolean before) {
        if (constraints != null) {
            // don't use enhanced for loop to avoid creating objects
            for (int i = 0, size = constraints.size(); i < size; i++) {
                Constraint constraint = constraints.get(i);
                if (constraint.isBefore() == before) {
                    constraint.checkRow(session, this, oldRow, newRow);
                }
            }
        }
    }

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