@Override
 public int update() {
   session.commit(true);
   Database db = session.getDatabase();
   session.getUser().checkRight(table, Right.ALL);
   table.checkSupportAlter();
   table.lock(session, true, true);
   Sequence sequence = oldColumn == null ? null : oldColumn.getSequence();
   if (newColumn != null) {
     checkDefaultReferencesTable((Expression) newColumn.getDefaultExpression());
   }
   if (columnsToAdd != null) {
     for (Column column : columnsToAdd) {
       checkDefaultReferencesTable((Expression) column.getDefaultExpression());
     }
   }
   switch (type) {
     case CommandInterface.ALTER_TABLE_ALTER_COLUMN_NOT_NULL:
       {
         if (!oldColumn.isNullable()) {
           // no change
           break;
         }
         checkNoNullValues();
         oldColumn.setNullable(false);
         db.updateMeta(session, table);
         break;
       }
     case CommandInterface.ALTER_TABLE_ALTER_COLUMN_NULL:
       {
         if (oldColumn.isNullable()) {
           // no change
           break;
         }
         checkNullable();
         oldColumn.setNullable(true);
         db.updateMeta(session, table);
         break;
       }
     case CommandInterface.ALTER_TABLE_ALTER_COLUMN_DEFAULT:
       {
         checkDefaultReferencesTable(defaultExpression);
         oldColumn.setSequence(null);
         oldColumn.setDefaultExpression(session, defaultExpression);
         removeSequence(sequence);
         db.updateMeta(session, table);
         break;
       }
     case CommandInterface.ALTER_TABLE_ALTER_COLUMN_CHANGE_TYPE:
       {
         // if the change is only increasing the precision, then we don't
         // need to copy the table because the length is only a constraint,
         // and does not affect the storage structure.
         if (oldColumn.isWideningConversion(newColumn)) {
           convertAutoIncrementColumn(newColumn);
           oldColumn.copy(newColumn);
           db.updateMeta(session, table);
         } else {
           oldColumn.setSequence(null);
           oldColumn.setDefaultExpression(session, null);
           oldColumn.setConvertNullToDefault(false);
           if (oldColumn.isNullable() && !newColumn.isNullable()) {
             checkNoNullValues();
           } else if (!oldColumn.isNullable() && newColumn.isNullable()) {
             checkNullable();
           }
           convertAutoIncrementColumn(newColumn);
           copyData();
         }
         break;
       }
     case CommandInterface.ALTER_TABLE_ADD_COLUMN:
       {
         // ifNotExists only supported for single column add
         if (ifNotExists
             && columnsToAdd.size() == 1
             && table.doesColumnExist(columnsToAdd.get(0).getName())) {
           break;
         }
         for (Column column : columnsToAdd) {
           if (column.isAutoIncrement()) {
             int objId = getObjectId();
             column.convertAutoIncrementToSequence(
                 session, getSchema(), objId, table.isTemporary());
           }
         }
         copyData();
         break;
       }
     case CommandInterface.ALTER_TABLE_DROP_COLUMN:
       {
         if (table.getColumns().length == 1) {
           throw DbException.get(ErrorCode.CANNOT_DROP_LAST_COLUMN, oldColumn.getSQL());
         }
         table.dropSingleColumnConstraintsAndIndexes(session, oldColumn);
         copyData();
         break;
       }
     case CommandInterface.ALTER_TABLE_ALTER_COLUMN_SELECTIVITY:
       {
         int value = newSelectivity.optimize(session).getValue(session).getInt();
         oldColumn.setSelectivity(value);
         db.updateMeta(session, table);
         break;
       }
     default:
       DbException.throwInternalError("type=" + type);
   }
   return 0;
 }
示例#2
0
 @Override
 public int update() {
   if (!transactional) {
     session.commit(true);
   }
   Database db = session.getDatabase();
   if (!db.isPersistent()) {
     data.persistIndexes = false;
   }
   if (getSchema().findTableOrView(session, data.tableName) != null) {
     if (ifNotExists) {
       return 0;
     }
     throw DbException.get(ErrorCode.TABLE_OR_VIEW_ALREADY_EXISTS_1, data.tableName);
   }
   if (asQuery != null) {
     asQuery.prepare();
     if (data.columns.isEmpty()) {
       generateColumnsFromQuery();
     } else if (data.columns.size() != asQuery.getColumnCount()) {
       throw DbException.get(ErrorCode.COLUMN_COUNT_DOES_NOT_MATCH);
     }
   }
   if (pkColumns != null) {
     for (Column c : data.columns) {
       for (IndexColumn idxCol : pkColumns) {
         if (c.getName().equals(idxCol.columnName)) {
           c.setNullable(false);
         }
       }
     }
   }
   data.id = getObjectId();
   data.create = create;
   data.session = session;
   boolean isSessionTemporary = data.temporary && !data.globalTemporary;
   if (!isSessionTemporary) {
     db.lockMeta(session);
   }
   Table table = createTable(data);
   ArrayList<Sequence> sequences = New.arrayList();
   for (Column c : data.columns) {
     if (c.isAutoIncrement()) {
       int objId = getObjectId();
       c.convertAutoIncrementToSequence(session, getSchema(), objId, data.temporary);
     }
     Sequence seq = c.getSequence();
     if (seq != null) {
       sequences.add(seq);
     }
   }
   table.setComment(comment);
   if (isSessionTemporary) {
     if (onCommitDrop) {
       table.setOnCommitDrop(true);
     }
     if (onCommitTruncate) {
       table.setOnCommitTruncate(true);
     }
     session.addLocalTempTable(table);
   } else {
     db.lockMeta(session);
     db.addSchemaObject(session, table);
   }
   try {
     for (Column c : data.columns) {
       c.prepareExpression(session);
     }
     for (Sequence sequence : sequences) {
       table.addSequence(sequence);
     }
     for (DefineCommand command : constraintCommands) {
       command.setTransactional(transactional);
       command.update();
     }
     if (asQuery != null) {
       Insert insert = null;
       insert = new Insert(session);
       insert.setSortedInsertMode(sortedInsertMode);
       insert.setQuery(asQuery);
       insert.setTable(table);
       insert.setInsertFromSelect(true);
       insert.prepare();
       insert.update();
     }
   } catch (DbException e) {
     db.checkPowerOff();
     db.removeSchemaObject(session, table);
     if (!transactional) {
       session.commit(true);
     }
     throw e;
   }
   return 0;
 }