Exemplo n.º 1
0
 private int generateInsertValues(int count, Table table) throws IOException {
   PlanItem plan = table.getBestPlanItem(session, null, null);
   Index index = plan.getIndex();
   Cursor cursor = index.find(session, null, null);
   Column[] columns = table.getColumns();
   StatementBuilder buff = new StatementBuilder("INSERT INTO ");
   buff.append(table.getSQL()).append('(');
   for (Column col : columns) {
     buff.appendExceptFirst(", ");
     buff.append(Parser.quoteIdentifier(col.getName()));
   }
   buff.append(") VALUES");
   if (!simple) {
     buff.append('\n');
   }
   buff.append('(');
   String ins = buff.toString();
   buff = null;
   while (cursor.next()) {
     Row row = cursor.get();
     if (buff == null) {
       buff = new StatementBuilder(ins);
     } else {
       buff.append(",\n(");
     }
     for (int j = 0; j < row.getColumnCount(); j++) {
       if (j > 0) {
         buff.append(", ");
       }
       Value v = row.getValue(j);
       if (v.getPrecision() > lobBlockSize) {
         int id;
         if (v.getType() == Value.CLOB) {
           id = writeLobStream(v);
           buff.append("SYSTEM_COMBINE_CLOB(" + id + ")");
         } else if (v.getType() == Value.BLOB) {
           id = writeLobStream(v);
           buff.append("SYSTEM_COMBINE_BLOB(" + id + ")");
         } else {
           buff.append(v.getSQL());
         }
       } else {
         buff.append(v.getSQL());
       }
     }
     buff.append(')');
     count++;
     if ((count & 127) == 0) {
       checkCanceled();
     }
     if (simple || buff.length() > Constants.IO_BUFFER_SIZE) {
       add(buff.toString(), true);
       buff = null;
     }
   }
   if (buff != null) {
     add(buff.toString(), true);
   }
   return count;
 }
Exemplo n.º 2
0
 private void merge(Row row) {
   ArrayList<Parameter> k = update.getParameters();
   for (int i = 0; i < columns.length; i++) {
     Column col = columns[i];
     Value v = row.getValue(col.getColumnId());
     Parameter p = k.get(i);
     p.setValue(v);
   }
   for (int i = 0; i < keys.length; i++) {
     Column col = keys[i];
     Value v = row.getValue(col.getColumnId());
     if (v == null) {
       throw DbException.get(ErrorCode.COLUMN_CONTAINS_NULL_VALUES_1, col.getSQL());
     }
     Parameter p = k.get(columns.length + i);
     p.setValue(v);
   }
   int count = update.update();
   if (count == 0) {
     try {
       table.validateConvertUpdateSequence(session, row);
       boolean done = table.fireBeforeRow(session, null, row);
       if (!done) {
         table.lock(session, true, false);
         table.addRow(session, row);
         session.log(table, UndoLogRecord.INSERT, row);
         table.fireAfterRow(session, null, row, false);
       }
     } catch (DbException e) {
       if (e.getErrorCode() == ErrorCode.DUPLICATE_KEY_1) {
         // possibly a concurrent merge or insert
         Index index = (Index) e.getSource();
         if (index != null) {
           // verify the index columns match the key
           Column[] indexColumns = index.getColumns();
           boolean indexMatchesKeys = false;
           if (indexColumns.length <= keys.length) {
             for (int i = 0; i < indexColumns.length; i++) {
               if (indexColumns[i] != keys[i]) {
                 indexMatchesKeys = false;
                 break;
               }
             }
           }
           if (indexMatchesKeys) {
             throw DbException.get(ErrorCode.CONCURRENT_UPDATE_1, table.getName());
           }
         }
       }
       throw e;
     }
   } else if (count != 1) {
     throw DbException.get(ErrorCode.DUPLICATE_KEY_1, table.getSQL());
   }
 }
Exemplo n.º 3
0
 /**
  * Remove the given index from the list.
  *
  * @param index the index to remove
  */
 public void removeIndex(Index index) {
   ArrayList<Index> indexes = getIndexes();
   if (indexes != null) {
     remove(indexes, index);
     if (index.getIndexType().isPrimaryKey()) {
       for (Column col : index.getColumns()) {
         col.setPrimaryKey(false);
       }
     }
   }
 }
Exemplo n.º 4
0
 /**
  * Get the primary key index if there is one, or null if there is none.
  *
  * @return the primary key index or null
  */
 public Index findPrimaryKey() {
   ArrayList<Index> indexes = getIndexes();
   if (indexes != null) {
     for (int i = 0, size = indexes.size(); i < size; i++) {
       Index idx = indexes.get(i);
       if (idx.getIndexType().isPrimaryKey()) {
         return idx;
       }
     }
   }
   return null;
 }
Exemplo n.º 5
0
 @Override
 public int update() {
   session.commit(true);
   Database db = session.getDatabase();
   Schema schema = oldIndex.getSchema();
   if (schema.findIndex(session, newIndexName) != null
       || newIndexName.equals(oldIndex.getName())) {
     throw DbException.get(ErrorCode.INDEX_ALREADY_EXISTS_1, newIndexName);
   }
   session.getUser().checkRight(oldIndex.getTable(), Right.ALL);
   db.renameSchemaObject(session, oldIndex, newIndexName);
   return 0;
 }
Exemplo n.º 6
0
 public void prepare() {
   if (columns == null) {
     if (list.size() > 0 && list.get(0).length == 0) {
       // special case where table is used as a sequence
       columns = new Column[0];
     } else {
       columns = table.getColumns();
     }
   }
   if (list.size() > 0) {
     for (Expression[] expr : list) {
       if (expr.length != columns.length) {
         throw DbException.get(ErrorCode.COLUMN_COUNT_DOES_NOT_MATCH);
       }
       for (int i = 0; i < expr.length; i++) {
         Expression e = expr[i];
         if (e != null) {
           expr[i] = e.optimize(session);
         }
       }
     }
   } else {
     query.prepare();
     if (query.getColumnCount() != columns.length) {
       throw DbException.get(ErrorCode.COLUMN_COUNT_DOES_NOT_MATCH);
     }
   }
   if (keys == null) {
     Index idx = table.getPrimaryKey();
     if (idx == null) {
       throw DbException.get(ErrorCode.CONSTRAINT_NOT_FOUND_1, "PRIMARY KEY");
     }
     keys = idx.getColumns();
   }
   StatementBuilder buff = new StatementBuilder("UPDATE ");
   buff.append(table.getSQL()).append(" SET ");
   for (Column c : columns) {
     buff.appendExceptFirst(", ");
     buff.append(c.getSQL()).append("=?");
   }
   buff.append(" WHERE ");
   buff.resetCount();
   for (Column c : keys) {
     buff.appendExceptFirst(" AND ");
     buff.append(c.getSQL()).append("=?");
   }
   String sql = buff.toString();
   update = session.prepare(sql);
 }
Exemplo n.º 7
0
 /**
  * Get the index that has the given column as the first element. This method returns null if no
  * matching index is found.
  *
  * @param first if the min value should be returned
  * @return the index or null
  */
 public Index getIndexForColumn(Column column) {
   ArrayList<Index> indexes = getIndexes();
   if (indexes != null) {
     for (int i = 1, size = indexes.size(); i < size; i++) {
       Index index = indexes.get(i);
       if (index.canGetFirstOrLast()) {
         int idx = index.getColumnIndex(column);
         if (idx == 0) {
           return index;
         }
       }
     }
   }
   return null;
 }
Exemplo n.º 8
0
 /**
  * Get the best plan for the given search mask.
  *
  * @param session the session
  * @param masks per-column comparison bit masks, null means 'always false', see constants in
  *     IndexCondition
  * @param sortOrder the sort order
  * @return the plan item
  */
 public PlanItem getBestPlanItem(Session session, int[] masks, SortOrder sortOrder) {
   PlanItem item = new PlanItem();
   item.setIndex(getScanIndex(session));
   item.cost = item.getIndex().getCost(session, null, null);
   ArrayList<Index> indexes = getIndexes();
   if (indexes != null && masks != null) {
     for (int i = 1, size = indexes.size(); i < size; i++) {
       Index index = indexes.get(i);
       double cost = index.getCost(session, masks, sortOrder);
       if (cost < item.cost) {
         item.cost = cost;
         item.setIndex(index);
       }
     }
   }
   return item;
 }
Exemplo n.º 9
0
 /**
  * Check that this column is not referenced by a multi-column constraint or multi-column index. If
  * it is, an exception is thrown. Single-column references and indexes are dropped.
  *
  * @param session the session
  * @param col the column
  * @throws DbException if the column is referenced by multi-column constraints or indexes
  */
 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();
   if (indexes != null) {
     for (int i = 0, size = indexes.size(); i < size; i++) {
       Index index = indexes.get(i);
       if (index.getCreateSQL() == null) {
         continue;
       }
       if (index.getColumnIndex(col) < 0) {
         continue;
       }
       if (index.getColumns().length == 1) {
         indexesToDrop.add(index);
       } else {
         throw DbException.get(ErrorCode.COLUMN_IS_REFERENCED_1, index.getSQL());
       }
     }
   }
   for (Constraint c : constraintsToDrop) {
     session.getDatabase().removeSchemaObject(session, c);
   }
   for (Index i : indexesToDrop) {
     // the index may already have been dropped when dropping the constraint
     if (getIndexes().contains(i)) {
       session.getDatabase().removeSchemaObject(session, i);
     }
   }
 }
Exemplo n.º 10
0
 private static boolean canUseIndex(Index existingIndex, Table table, IndexColumn[] cols) {
   if (existingIndex.getTable() != table || existingIndex.getCreateSQL() == null) {
     // can't use the scan index or index of another table
     return false;
   }
   Column[] indexCols = existingIndex.getColumns();
   if (indexCols.length < cols.length) {
     return false;
   }
   for (IndexColumn col : cols) {
     // all columns of the list must be part of the index,
     // but not all columns of the index need to be part of the list
     // holes are not allowed (index=a,b,c & list=a,b is ok; but list=a,c
     // is not)
     int idx = existingIndex.getColumnIndex(col.column);
     if (idx < 0 || idx >= cols.length) {
       return false;
     }
   }
   return true;
 }
Exemplo n.º 11
0
 private static boolean canUseUniqueIndex(Index idx, Table table, IndexColumn[] cols) {
   if (idx.getTable() != table || !idx.getIndexType().isUnique()) {
     return false;
   }
   Column[] indexCols = idx.getColumns();
   if (indexCols.length > cols.length) {
     return false;
   }
   HashSet<Column> set = New.hashSet();
   for (IndexColumn c : cols) {
     set.add(c.column);
   }
   for (Column c : indexCols) {
     // all columns of the index must be part of the list,
     // but not all columns of the list need to be part of the index
     if (!set.contains(c)) {
       return false;
     }
   }
   return true;
 }
Exemplo n.º 12
0
  @Override
  public ResultInterface query(int maxrows) {
    session.getUser().checkAdmin();
    reset();
    Database db = session.getDatabase();
    if (schemaNames != null) {
      for (String schemaName : schemaNames) {
        Schema schema = db.findSchema(schemaName);
        if (schema == null) {
          throw DbException.get(ErrorCode.SCHEMA_NOT_FOUND_1, schemaName);
        }
      }
    }
    try {
      result = createResult();
      deleteStore();
      openOutput();
      if (out != null) {
        buffer = new byte[Constants.IO_BUFFER_SIZE];
      }
      if (settings) {
        for (Setting setting : db.getAllSettings()) {
          if (setting.getName().equals(SetTypes.getTypeName(SetTypes.CREATE_BUILD))) {
            // don't add CREATE_BUILD to the script
            // (it is only set when creating the database)
            continue;
          }
          add(setting.getCreateSQL(), false);
        }
      }
      if (out != null) {
        add("", true);
      }
      for (User user : db.getAllUsers()) {
        add(user.getCreateSQL(passwords), false);
      }
      for (Role role : db.getAllRoles()) {
        add(role.getCreateSQL(true), false);
      }
      for (Schema schema : db.getAllSchemas()) {
        if (excludeSchema(schema)) {
          continue;
        }
        add(schema.getCreateSQL(), false);
      }
      for (UserDataType datatype : db.getAllUserDataTypes()) {
        if (drop) {
          add(datatype.getDropSQL(), false);
        }
        add(datatype.getCreateSQL(), false);
      }
      for (SchemaObject obj : db.getAllSchemaObjects(DbObject.CONSTANT)) {
        if (excludeSchema(obj.getSchema())) {
          continue;
        }
        Constant constant = (Constant) obj;
        add(constant.getCreateSQL(), false);
      }

      final ArrayList<Table> tables = db.getAllTablesAndViews(false);
      // sort by id, so that views are after tables and views on views
      // after the base views
      Collections.sort(
          tables,
          new Comparator<Table>() {
            @Override
            public int compare(Table t1, Table t2) {
              return t1.getId() - t2.getId();
            }
          });

      // Generate the DROP XXX ... IF EXISTS
      for (Table table : tables) {
        if (excludeSchema(table.getSchema())) {
          continue;
        }
        if (excludeTable(table)) {
          continue;
        }
        if (table.isHidden()) {
          continue;
        }
        table.lock(session, false, false);
        String sql = table.getCreateSQL();
        if (sql == null) {
          // null for metadata tables
          continue;
        }
        if (drop) {
          add(table.getDropSQL(), false);
        }
      }
      for (SchemaObject obj : db.getAllSchemaObjects(DbObject.FUNCTION_ALIAS)) {
        if (excludeSchema(obj.getSchema())) {
          continue;
        }
        if (drop) {
          add(obj.getDropSQL(), false);
        }
        add(obj.getCreateSQL(), false);
      }
      for (UserAggregate agg : db.getAllAggregates()) {
        if (drop) {
          add(agg.getDropSQL(), false);
        }
        add(agg.getCreateSQL(), false);
      }
      for (SchemaObject obj : db.getAllSchemaObjects(DbObject.SEQUENCE)) {
        if (excludeSchema(obj.getSchema())) {
          continue;
        }
        Sequence sequence = (Sequence) obj;
        if (drop) {
          add(sequence.getDropSQL(), false);
        }
        add(sequence.getCreateSQL(), false);
      }

      // Generate CREATE TABLE and INSERT...VALUES
      int count = 0;
      for (Table table : tables) {
        if (excludeSchema(table.getSchema())) {
          continue;
        }
        if (excludeTable(table)) {
          continue;
        }
        if (table.isHidden()) {
          continue;
        }
        table.lock(session, false, false);
        String createTableSql = table.getCreateSQL();
        if (createTableSql == null) {
          // null for metadata tables
          continue;
        }
        final String tableType = table.getTableType();
        add(createTableSql, false);
        final ArrayList<Constraint> constraints = table.getConstraints();
        if (constraints != null) {
          for (Constraint constraint : constraints) {
            if (Constraint.PRIMARY_KEY.equals(constraint.getConstraintType())) {
              add(constraint.getCreateSQLWithoutIndexes(), false);
            }
          }
        }
        if (Table.TABLE.equals(tableType)) {
          if (table.canGetRowCount()) {
            String rowcount =
                "-- "
                    + table.getRowCountApproximation()
                    + " +/- SELECT COUNT(*) FROM "
                    + table.getSQL();
            add(rowcount, false);
          }
          if (data) {
            count = generateInsertValues(count, table);
          }
        }
        final ArrayList<Index> indexes = table.getIndexes();
        for (int j = 0; indexes != null && j < indexes.size(); j++) {
          Index index = indexes.get(j);
          if (!index.getIndexType().getBelongsToConstraint()) {
            add(index.getCreateSQL(), false);
          }
        }
      }
      if (tempLobTableCreated) {
        add("DROP TABLE IF EXISTS SYSTEM_LOB_STREAM", true);
        add("CALL SYSTEM_COMBINE_BLOB(-1)", true);
        add("DROP ALIAS IF EXISTS SYSTEM_COMBINE_CLOB", true);
        add("DROP ALIAS IF EXISTS SYSTEM_COMBINE_BLOB", true);
        tempLobTableCreated = false;
      }
      // Generate CREATE CONSTRAINT ...
      final ArrayList<SchemaObject> constraints = db.getAllSchemaObjects(DbObject.CONSTRAINT);
      Collections.sort(
          constraints,
          new Comparator<SchemaObject>() {
            @Override
            public int compare(SchemaObject c1, SchemaObject c2) {
              return ((Constraint) c1).compareTo((Constraint) c2);
            }
          });
      for (SchemaObject obj : constraints) {
        if (excludeSchema(obj.getSchema())) {
          continue;
        }
        Constraint constraint = (Constraint) obj;
        if (excludeTable(constraint.getTable())) {
          continue;
        }
        if (constraint.getTable().isHidden()) {
          continue;
        }
        if (!Constraint.PRIMARY_KEY.equals(constraint.getConstraintType())) {
          add(constraint.getCreateSQLWithoutIndexes(), false);
        }
      }
      // Generate CREATE TRIGGER ...
      for (SchemaObject obj : db.getAllSchemaObjects(DbObject.TRIGGER)) {
        if (excludeSchema(obj.getSchema())) {
          continue;
        }
        TriggerObject trigger = (TriggerObject) obj;
        if (excludeTable(trigger.getTable())) {
          continue;
        }
        add(trigger.getCreateSQL(), false);
      }
      // Generate GRANT ...
      for (Right right : db.getAllRights()) {
        Table table = right.getGrantedTable();
        if (table != null) {
          if (excludeSchema(table.getSchema())) {
            continue;
          }
          if (excludeTable(table)) {
            continue;
          }
        }
        add(right.getCreateSQL(), false);
      }
      // Generate COMMENT ON ...
      for (Comment comment : db.getAllComments()) {
        add(comment.getCreateSQL(), false);
      }
      if (out != null) {
        out.close();
      }
    } catch (IOException e) {
      throw DbException.convertIOException(e, getFileName());
    } finally {
      closeIO();
    }
    result.done();
    LocalResult r = result;
    reset();
    return r;
  }
Exemplo n.º 13
0
 /**
  * Try to execute the statement.
  *
  * @return the update count
  */
 private int tryUpdate() {
   if (!transactional) {
     session.commit(true);
   }
   Database db = session.getDatabase();
   Table table = getSchema().getTableOrView(session, tableName);
   if (getSchema().findConstraint(session, constraintName) != null) {
     if (ifNotExists) {
       return 0;
     }
     throw DbException.get(ErrorCode.CONSTRAINT_ALREADY_EXISTS_1, constraintName);
   }
   session.getUser().checkRight(table, Right.ALL);
   db.lockMeta(session);
   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
           // we don't test ascending / descending
           IndexColumn[] pkCols = index.getIndexColumns();
           if (pkCols.length != indexColumns.length) {
             throw DbException.get(ErrorCode.SECOND_PRIMARY_KEY);
           }
           for (int i = 0; i < pkCols.length; i++) {
             if (pkCols[i].column != indexColumns[i].column) {
               throw DbException.get(ErrorCode.SECOND_PRIMARY_KEY);
             }
           }
         }
         if (index == null) {
           IndexType indexType =
               IndexType.createPrimaryKey(table.isPersistIndexes(), primaryKeyHash);
           String indexName =
               table.getSchema().getUniqueIndexName(session, table, Constants.PREFIX_PRIMARY_KEY);
           int id = getObjectId();
           try {
             index = table.addIndex(session, indexName, id, indexColumns, indexType, true, null);
           } finally {
             getSchema().freeUniqueName(indexName);
           }
         }
         index.getIndexType().setBelongsToConstraint(true);
         int constraintId = getObjectId();
         String name = generateConstraintName(table);
         ConstraintUnique pk = new ConstraintUnique(getSchema(), constraintId, name, table, true);
         pk.setColumns(indexColumns);
         pk.setIndex(index, true);
         constraint = pk;
         break;
       }
     case CommandInterface.ALTER_TABLE_ADD_CONSTRAINT_UNIQUE:
       {
         IndexColumn.mapColumns(indexColumns, table);
         boolean isOwner = false;
         if (index != null && canUseUniqueIndex(index, table, indexColumns)) {
           isOwner = true;
           index.getIndexType().setBelongsToConstraint(true);
         } else {
           index = getUniqueIndex(table, indexColumns);
           if (index == null) {
             index = createIndex(table, indexColumns, true);
             isOwner = true;
           }
         }
         int id = getObjectId();
         String name = generateConstraintName(table);
         ConstraintUnique unique = new ConstraintUnique(getSchema(), id, name, table, false);
         unique.setColumns(indexColumns);
         unique.setIndex(index, isOwner);
         constraint = unique;
         break;
       }
     case CommandInterface.ALTER_TABLE_ADD_CONSTRAINT_CHECK:
       {
         int id = getObjectId();
         String name = generateConstraintName(table);
         ConstraintCheck check = new ConstraintCheck(getSchema(), id, name, table);
         TableFilter filter = new TableFilter(session, table, null, false, null);
         checkExpression.mapColumns(filter, 0);
         checkExpression = checkExpression.optimize(session);
         check.setExpression(checkExpression);
         check.setTableFilter(filter);
         constraint = check;
         if (checkExisting) {
           check.checkExistingData(session);
         }
         break;
       }
     case CommandInterface.ALTER_TABLE_ADD_CONSTRAINT_REFERENTIAL:
       {
         Table refTable = refSchema.getTableOrView(session, refTableName);
         session.getUser().checkRight(refTable, Right.ALL);
         if (!refTable.canReference()) {
           throw DbException.get(
               ErrorCode.FEATURE_NOT_SUPPORTED_1, "Reference " + refTable.getSQL());
         }
         boolean isOwner = false;
         IndexColumn.mapColumns(indexColumns, table);
         if (index != null && canUseIndex(index, table, indexColumns)) {
           isOwner = true;
           index.getIndexType().setBelongsToConstraint(true);
         } else {
           index = getIndex(table, indexColumns);
           if (index == null) {
             index = createIndex(table, indexColumns, false);
             isOwner = true;
           }
         }
         if (refIndexColumns == null) {
           Index refIdx = refTable.getPrimaryKey();
           refIndexColumns = refIdx.getIndexColumns();
         } else {
           IndexColumn.mapColumns(refIndexColumns, refTable);
         }
         if (refIndexColumns.length != indexColumns.length) {
           throw DbException.get(ErrorCode.COLUMN_COUNT_DOES_NOT_MATCH);
         }
         boolean isRefOwner = false;
         if (refIndex != null
             && refIndex.getTable() == refTable
             && canUseIndex(refIndex, refTable, refIndexColumns)) {
           isRefOwner = true;
           refIndex.getIndexType().setBelongsToConstraint(true);
         } else {
           refIndex = null;
         }
         if (refIndex == null) {
           refIndex = getIndex(refTable, refIndexColumns);
           if (refIndex == null) {
             refIndex = createIndex(refTable, refIndexColumns, true);
             isRefOwner = true;
           }
         }
         int id = getObjectId();
         String name = generateConstraintName(table);
         ConstraintReferential ref = new ConstraintReferential(getSchema(), id, name, table);
         ref.setColumns(indexColumns);
         ref.setIndex(index, isOwner);
         ref.setRefTable(refTable);
         ref.setRefColumns(refIndexColumns);
         ref.setRefIndex(refIndex, isRefOwner);
         if (checkExisting) {
           ref.checkExistingData(session);
         }
         constraint = ref;
         refTable.addConstraint(constraint);
         ref.setDeleteAction(deleteAction);
         ref.setUpdateAction(updateAction);
         break;
       }
     default:
       throw DbException.throwInternalError("type=" + type);
   }
   // parent relationship is already set with addConstraint
   constraint.setComment(comment);
   if (table.isTemporary() && !table.isGlobalTemporary()) {
     session.addLocalTempTableConstraint(constraint);
   } else {
     db.addSchemaObject(session, constraint);
   }
   table.addConstraint(constraint);
   return 0;
 }