Examples with ColumnDescriptor org.apache.derby.iapi.sql.dictionary.ColumnDescriptor used on opensource projects

Example 71 with ColumnDescriptor

use of org.apache.derby.iapi.sql.dictionary.ColumnDescriptor in project derby by apache.

the class ResultColumnList method bindResultColumnsByName.

/**
 * Bind the result columns by their names.  This is useful for update
 * VTI statements, and for INSERT statements like "insert into new t() (a, b, c)
 * values (1, 2, 3)" where the user specified a column list.
 * Also, verify that the result column list does not contain any duplicates.
 * NOTE: We pass the ResultColumns position in the ResultColumnList so
 * that the VirtualColumnId gets set.
 *
 * @param fullRCL	The full RCL for the target table
 * @param statement			DMLStatementNode containing this list
 *
 * @exception StandardException		Thrown on error
 */
void bindResultColumnsByName(ResultColumnList fullRCL, FromVTI targetVTI, DMLStatementNode statement) throws StandardException {
    int size = size();
    HashSet<String> seenNames = new HashSet<String>(size + 2, 0.999f);
    for (int index = 0; index < size; index++) {
        ResultColumn matchRC;
        ResultColumn rc = elementAt(index);
        /* Verify that this column's name is unique within the list */
        String colName = rc.getName();
        boolean alreadySeen = !seenNames.add(colName);
        if (alreadySeen) {
            if (SanityManager.DEBUG) {
                SanityManager.ASSERT((statement instanceof UpdateNode) || (statement instanceof InsertNode), "statement is expected to be instanceof UpdateNode or InsertNode");
            }
            if (statement instanceof UpdateNode) {
                throw StandardException.newException(SQLState.LANG_DUPLICATE_COLUMN_NAME_UPDATE, colName);
            } else {
                throw StandardException.newException(SQLState.LANG_DUPLICATE_COLUMN_NAME_INSERT, colName);
            }
        }
        matchRC = fullRCL.getResultColumn(null, rc.getName());
        if (matchRC == null) {
            throw StandardException.newException(SQLState.LANG_COLUMN_NOT_FOUND_IN_TABLE, rc.getName(), targetVTI.getMethodCall().getJavaClassName());
        }
        /* We have a match.  We need to create a dummy ColumnDescriptor
			 * since calling code expects one to get column info.
			 */
        ColumnDescriptor cd = new ColumnDescriptor(rc.getName(), matchRC.getVirtualColumnId(), matchRC.getType(), null, null, (TableDescriptor) null, null, 0, 0, false);
        rc.setColumnDescriptor(null, cd);
        rc.setVirtualColumnId(index + 1);
    }
}

Example 72 with ColumnDescriptor

use of org.apache.derby.iapi.sql.dictionary.ColumnDescriptor in project derby by apache.

the class SYSCOLUMNSRowFactory method buildDescriptor.

// /////////////////////////////////////////////////////////////////////////
// 
// ABSTRACT METHODS TO BE IMPLEMENTED BY CHILDREN OF CatalogRowFactory
// 
// /////////////////////////////////////////////////////////////////////////
/**
 * Make a ColumnDescriptor out of a SYSCOLUMNS row
 *
 * @param row 					a SYSCOLUMNS row
 * @param parentTupleDescriptor	The UniqueTupleDescriptor for the object that is tied
 *								to this column
 * @param dd 					dataDictionary
 *
 * @return	a column descriptor equivalent to a SYSCOLUMNS row
 *
 * @exception   StandardException thrown on failure
 */
public TupleDescriptor buildDescriptor(ExecRow row, TupleDescriptor parentTupleDescriptor, DataDictionary dd) throws StandardException {
    if (SanityManager.DEBUG) {
        int expectedCols = dd.checkVersion(DataDictionary.DD_VERSION_DERBY_10_14, null) ? SYSCOLUMNS_COLUMN_COUNT : (SYSCOLUMNS_COLUMN_COUNT - 1);
        SanityManager.ASSERT(row.nColumns() == expectedCols, "Wrong number of columns for a SYSCOLUMNS row");
    }
    int columnNumber;
    String columnName;
    String defaultID;
    DefaultInfoImpl defaultInfo = null;
    ColumnDescriptor colDesc;
    DataValueDescriptor defaultValue = null;
    UUID defaultUUID = null;
    UUID uuid = null;
    UUIDFactory uuidFactory = getUUIDFactory();
    long autoincStart, autoincInc, autoincValue;
    boolean autoincCycle = false;
    DataDescriptorGenerator ddg = dd.getDataDescriptorGenerator();
    /*
		** We're going to be getting the UUID for this sucka
		** so make sure it is a UniqueTupleDescriptor.
		*/
    if (parentTupleDescriptor != null) {
        if (SanityManager.DEBUG) {
            if (!(parentTupleDescriptor instanceof UniqueTupleDescriptor)) {
                SanityManager.THROWASSERT(parentTupleDescriptor.getClass().getName() + " not instanceof UniqueTupleDescriptor");
            }
        }
        uuid = ((UniqueTupleDescriptor) parentTupleDescriptor).getUUID();
    } else {
        /* 1st column is REFERENCEID (char(36)) */
        uuid = uuidFactory.recreateUUID(row.getColumn(SYSCOLUMNS_REFERENCEID).getString());
    }
    /* NOTE: We get columns 5 and 6 next in order to work around 
		 * a 1.3.0 HotSpot bug.  (#4361550)
		 */
    // 5th column is COLUMNDEFAULT (serialiazable)
    Object object = row.getColumn(SYSCOLUMNS_COLUMNDEFAULT).getObject();
    if (object instanceof DataValueDescriptor) {
        defaultValue = (DataValueDescriptor) object;
    } else if (object instanceof DefaultInfoImpl) {
        defaultInfo = (DefaultInfoImpl) object;
        defaultValue = defaultInfo.getDefaultValue();
    }
    /* 6th column is DEFAULTID (char(36)) */
    defaultID = row.getColumn(SYSCOLUMNS_COLUMNDEFAULTID).getString();
    if (defaultID != null) {
        defaultUUID = uuidFactory.recreateUUID(defaultID);
    }
    /* 2nd column is COLUMNNAME (varchar(128)) */
    columnName = row.getColumn(SYSCOLUMNS_COLUMNNAME).getString();
    /* 3rd column is COLUMNNUMBER (int) */
    columnNumber = row.getColumn(SYSCOLUMNS_COLUMNNUMBER).getInt();
    /* 4th column is COLUMNDATATYPE */
    /*
		** What is stored in the column is a TypeDescriptorImpl, which
		** points to a BaseTypeIdImpl.  These are simple types that are
		** intended to be movable to the client, so they don't have
		** the entire implementation.  We need to wrap them in DataTypeServices
		** and TypeId objects that contain the full implementations for
		** language processing.
		*/
    TypeDescriptor catalogType = (TypeDescriptor) row.getColumn(SYSCOLUMNS_COLUMNDATATYPE).getObject();
    DataTypeDescriptor dataTypeServices = DataTypeDescriptor.getType(catalogType);
    /* 7th column is AUTOINCREMENTVALUE (long) */
    autoincValue = row.getColumn(SYSCOLUMNS_AUTOINCREMENTVALUE).getLong();
    /* 8th column is AUTOINCREMENTSTART (long) */
    autoincStart = row.getColumn(SYSCOLUMNS_AUTOINCREMENTSTART).getLong();
    /* 9th column is AUTOINCREMENTINC (long) */
    autoincInc = row.getColumn(SYSCOLUMNS_AUTOINCREMENTINC).getLong();
    if (row.nColumns() >= 10) {
        DataValueDescriptor col = row.getColumn(SYSCOLUMNS_AUTOINCREMENTINCCYCLE);
        autoincCycle = col.getBoolean();
    }
    DataValueDescriptor col = row.getColumn(SYSCOLUMNS_AUTOINCREMENTSTART);
    autoincStart = col.getLong();
    col = row.getColumn(SYSCOLUMNS_AUTOINCREMENTINC);
    autoincInc = col.getLong();
    // Hard upgraded tables <=10.13 come with a false autoincCyle before they are first
    // explicitly set with cycle or no cycle command.
    colDesc = new ColumnDescriptor(columnName, columnNumber, dataTypeServices, defaultValue, defaultInfo, uuid, defaultUUID, autoincStart, autoincInc, autoincValue, autoincCycle);
    return colDesc;
}

Example 73 with ColumnDescriptor

use of org.apache.derby.iapi.sql.dictionary.ColumnDescriptor in project derby by apache.

the class AlterTableConstantAction method dropColumnFromTable.

/**
 * Workhorse for dropping a column from a table.
 *
 * This routine drops a column from a table, taking care
 * to properly handle the various related schema objects.
 *
 * The syntax which gets you here is:
 *
 *   ALTER TABLE tbl DROP [COLUMN] col [CASCADE|RESTRICT]
 *
 * The keyword COLUMN is optional, and if you don't
 * specify CASCADE or RESTRICT, the default is CASCADE
 * (the default is chosen in the parser, not here).
 *
 * If you specify RESTRICT, then the column drop should be
 * rejected if it would cause a dependent schema object
 * to become invalid.
 *
 * If you specify CASCADE, then the column drop should
 * additionally drop other schema objects which have
 * become invalid.
 *
 * You may not drop the last (only) column in a table.
 *
 * Schema objects of interest include:
 *  - views
 *  - triggers
 *  - constraints
 *    - check constraints
 *    - primary key constraints
 *    - foreign key constraints
 *    - unique key constraints
 *    - not null constraints
 *  - privileges
 *  - indexes
 *  - default values
 *
 * Dropping a column may also change the column position
 * numbers of other columns in the table, which may require
 * fixup of schema objects (such as triggers and column
 * privileges) which refer to columns by column position number.
 *
 * Indexes are a bit interesting. The official SQL spec
 * doesn't talk about indexes; they are considered to be
 * an imlementation-specific performance optimization.
 * The current Derby behavior is that:
 *  - CASCADE/RESTRICT doesn't matter for indexes
 *  - when a column is dropped, it is removed from any indexes
 *    which contain it.
 *  - if that column was the only column in the index, the
 *    entire index is dropped.
 *
 * @param   columnName the name of the column specfication in the ALTER
 *						statement-- currently we allow only one.
 * @exception StandardException 	thrown on failure.
 */
private void dropColumnFromTable(String columnName) throws StandardException {
    boolean cascade = (behavior == StatementType.DROP_CASCADE);
    // drop any generated columns which reference this column
    ColumnDescriptorList generatedColumnList = td.getGeneratedColumns();
    int generatedColumnCount = generatedColumnList.size();
    ArrayList<String> cascadedDroppedColumns = new ArrayList<String>();
    for (int i = 0; i < generatedColumnCount; i++) {
        ColumnDescriptor generatedColumn = generatedColumnList.elementAt(i);
        String[] referencedColumnNames = generatedColumn.getDefaultInfo().getReferencedColumnNames();
        int referencedColumnCount = referencedColumnNames.length;
        for (int j = 0; j < referencedColumnCount; j++) {
            if (columnName.equals(referencedColumnNames[j])) {
                String generatedColumnName = generatedColumn.getColumnName();
                // we're trying to drop
                if (!cascade) {
                    // 
                    throw StandardException.newException(SQLState.LANG_PROVIDER_HAS_DEPENDENT_OBJECT, dm.getActionString(DependencyManager.DROP_COLUMN), columnName, "GENERATED COLUMN", generatedColumnName);
                } else {
                    cascadedDroppedColumns.add(generatedColumnName);
                }
            }
        }
    }
    DataDescriptorGenerator ddg = dd.getDataDescriptorGenerator();
    int cascadedDrops = cascadedDroppedColumns.size();
    int sizeAfterCascadedDrops = td.getColumnDescriptorList().size() - cascadedDrops;
    // can NOT drop a column if it is the only one in the table
    if (sizeAfterCascadedDrops == 1) {
        throw StandardException.newException(SQLState.LANG_PROVIDER_HAS_DEPENDENT_OBJECT, dm.getActionString(DependencyManager.DROP_COLUMN), "THE *LAST* COLUMN " + columnName, "TABLE", td.getQualifiedName());
    }
    // now drop dependent generated columns
    for (int i = 0; i < cascadedDrops; i++) {
        String generatedColumnName = cascadedDroppedColumns.get(i);
        activation.addWarning(StandardException.newWarning(SQLState.LANG_GEN_COL_DROPPED, generatedColumnName, td.getName()));
        // 
        // We can only recurse 2 levels since a generation clause cannot
        // refer to other generated columns.
        // 
        dropColumnFromTable(generatedColumnName);
    }
    /*
         * Cascaded drops of dependent generated columns may require us to
         * rebuild the table descriptor.
         */
    td = dd.getTableDescriptor(tableId);
    ColumnDescriptor columnDescriptor = td.getColumnDescriptor(columnName);
    // We already verified this in bind, but do it again
    if (columnDescriptor == null) {
        throw StandardException.newException(SQLState.LANG_COLUMN_NOT_FOUND_IN_TABLE, columnName, td.getQualifiedName());
    }
    int size = td.getColumnDescriptorList().size();
    droppedColumnPosition = columnDescriptor.getPosition();
    FormatableBitSet toDrop = new FormatableBitSet(size + 1);
    toDrop.set(droppedColumnPosition);
    td.setReferencedColumnMap(toDrop);
    dm.invalidateFor(td, (cascade ? DependencyManager.DROP_COLUMN : DependencyManager.DROP_COLUMN_RESTRICT), lcc);
    // If column has a default we drop the default and any dependencies
    if (columnDescriptor.getDefaultInfo() != null) {
        dm.clearDependencies(lcc, columnDescriptor.getDefaultDescriptor(dd));
    }
    // then we need to drop the system-generated sequence backing it.
    if (columnDescriptor.isAutoincrement() && dd.checkVersion(DataDictionary.DD_VERSION_DERBY_10_11, null)) {
        DropTableConstantAction.dropIdentitySequence(dd, td, activation);
    }
    // columns which are used through REFERENCING clause
    for (TriggerDescriptor trd : dd.getTriggerDescriptors(td)) {
        // If we find that the trigger is dependent on the column being
        // dropped because column is part of trigger columns list, then
        // we will give a warning or drop the trigger based on whether
        // ALTER TABLE DROP COLUMN is RESTRICT or CASCADE. In such a
        // case, no need to check if the trigger action columns referenced
        // through REFERENCING clause also used the column being dropped.
        boolean triggerDroppedAlready = false;
        int[] referencedCols = trd.getReferencedCols();
        if (referencedCols != null) {
            int refColLen = referencedCols.length, j;
            boolean changed = false;
            for (j = 0; j < refColLen; j++) {
                if (referencedCols[j] > droppedColumnPosition) {
                    // Trigger is not defined on the column being dropped
                    // but the column position of trigger column is changing
                    // because the position of the column being dropped is
                    // before the the trigger column
                    changed = true;
                } else if (referencedCols[j] == droppedColumnPosition) {
                    // the trigger is defined on the column being dropped
                    if (cascade) {
                        trd.drop(lcc);
                        triggerDroppedAlready = true;
                        activation.addWarning(StandardException.newWarning(SQLState.LANG_TRIGGER_DROPPED, trd.getName(), td.getName()));
                    } else {
                        // otherwsie there would be unexpected behaviors
                        throw StandardException.newException(SQLState.LANG_PROVIDER_HAS_DEPENDENT_OBJECT, dm.getActionString(DependencyManager.DROP_COLUMN), columnName, "TRIGGER", trd.getName());
                    }
                    break;
                }
            }
            // drop column.
            if (j == refColLen && changed) {
                dd.dropTriggerDescriptor(trd, tc);
                for (j = 0; j < refColLen; j++) {
                    if (referencedCols[j] > droppedColumnPosition)
                        referencedCols[j]--;
                }
                trd.setReferencedCols(referencedCols);
                dd.addDescriptor(trd, sd, DataDictionary.SYSTRIGGERS_CATALOG_NUM, false, tc);
            }
        }
        // loop above, then move to next trigger
        if (triggerDroppedAlready)
            continue;
        // Column being dropped is not one of trigger columns. Check if
        // that column is getting used inside the trigger action through
        // REFERENCING clause. This can be tracked only for triggers
        // created in 10.7 and higher releases. Derby releases prior to
        // that did not keep track of trigger action columns used
        // through the REFERENCING clause.
        int[] referencedColsInTriggerAction = trd.getReferencedColsInTriggerAction();
        if (referencedColsInTriggerAction != null) {
            int refColInTriggerActionLen = referencedColsInTriggerAction.length, j;
            boolean changedColPositionInTriggerAction = false;
            for (j = 0; j < refColInTriggerActionLen; j++) {
                if (referencedColsInTriggerAction[j] > droppedColumnPosition) {
                    changedColPositionInTriggerAction = true;
                } else if (referencedColsInTriggerAction[j] == droppedColumnPosition) {
                    if (cascade) {
                        trd.drop(lcc);
                        triggerDroppedAlready = true;
                        activation.addWarning(StandardException.newWarning(SQLState.LANG_TRIGGER_DROPPED, trd.getName(), td.getName()));
                    } else {
                        // we'd better give an error if don't drop it,
                        throw StandardException.newException(SQLState.LANG_PROVIDER_HAS_DEPENDENT_OBJECT, dm.getActionString(DependencyManager.DROP_COLUMN), columnName, "TRIGGER", trd.getName());
                    }
                    break;
                }
            }
            // column has been actually dropped from the table descriptor.
            if (j == refColInTriggerActionLen && changedColPositionInTriggerAction) {
                dd.dropTriggerDescriptor(trd, tc);
                for (j = 0; j < refColInTriggerActionLen; j++) {
                    if (referencedColsInTriggerAction[j] > droppedColumnPosition)
                        referencedColsInTriggerAction[j]--;
                }
                trd.setReferencedColsInTriggerAction(referencedColsInTriggerAction);
                dd.addDescriptor(trd, sd, DataDictionary.SYSTRIGGERS_CATALOG_NUM, false, tc);
            }
        }
    }
    ConstraintDescriptorList csdl = dd.getConstraintDescriptors(td);
    int csdl_size = csdl.size();
    ArrayList<ConstantAction> newCongloms = new ArrayList<ConstantAction>();
    // we want to remove referenced primary/unique keys in the second
    // round.  This will ensure that self-referential constraints will
    // work OK.
    int tbr_size = 0;
    ConstraintDescriptor[] toBeRemoved = new ConstraintDescriptor[csdl_size];
    // let's go downwards, don't want to get messed up while removing
    for (int i = csdl_size - 1; i >= 0; i--) {
        ConstraintDescriptor cd = csdl.elementAt(i);
        int[] referencedColumns = cd.getReferencedColumns();
        int numRefCols = referencedColumns.length, j;
        boolean changed = false;
        for (j = 0; j < numRefCols; j++) {
            if (referencedColumns[j] > droppedColumnPosition)
                changed = true;
            if (referencedColumns[j] == droppedColumnPosition)
                break;
        }
        if (// column not referenced
        j == numRefCols) {
            if ((cd instanceof CheckConstraintDescriptor) && changed) {
                dd.dropConstraintDescriptor(cd, tc);
                for (j = 0; j < numRefCols; j++) {
                    if (referencedColumns[j] > droppedColumnPosition)
                        referencedColumns[j]--;
                }
                ((CheckConstraintDescriptor) cd).setReferencedColumnsDescriptor(new ReferencedColumnsDescriptorImpl(referencedColumns));
                dd.addConstraintDescriptor(cd, tc);
            }
            continue;
        }
        if (!cascade) {
            // 
            throw StandardException.newException(SQLState.LANG_PROVIDER_HAS_DEPENDENT_OBJECT, dm.getActionString(DependencyManager.DROP_COLUMN), columnName, "CONSTRAINT", cd.getConstraintName());
        }
        if (cd instanceof ReferencedKeyConstraintDescriptor) {
            // restrict will raise an error in invalidate if referenced
            toBeRemoved[tbr_size++] = cd;
            continue;
        }
        // drop now in all other cases
        dm.invalidateFor(cd, DependencyManager.DROP_CONSTRAINT, lcc);
        dropConstraint(cd, td, newCongloms, activation, lcc, true);
        activation.addWarning(StandardException.newWarning(SQLState.LANG_CONSTRAINT_DROPPED, cd.getConstraintName(), td.getName()));
    }
    for (int i = tbr_size - 1; i >= 0; i--) {
        ConstraintDescriptor cd = toBeRemoved[i];
        dropConstraint(cd, td, newCongloms, activation, lcc, false);
        activation.addWarning(StandardException.newWarning(SQLState.LANG_CONSTRAINT_DROPPED, cd.getConstraintName(), td.getName()));
        if (cascade) {
            ConstraintDescriptorList fkcdl = dd.getForeignKeys(cd.getUUID());
            for (ConstraintDescriptor fkcd : fkcdl) {
                dm.invalidateFor(fkcd, DependencyManager.DROP_CONSTRAINT, lcc);
                dropConstraint(fkcd, td, newCongloms, activation, lcc, true);
                activation.addWarning(StandardException.newWarning(SQLState.LANG_CONSTRAINT_DROPPED, fkcd.getConstraintName(), fkcd.getTableDescriptor().getName()));
            }
        }
        dm.invalidateFor(cd, DependencyManager.DROP_CONSTRAINT, lcc);
        dm.clearDependencies(lcc, cd);
    }
    /* If there are new backing conglomerates which must be
		 * created to replace a dropped shared conglomerate
		 * (where the shared conglomerate was dropped as part
		 * of a "drop constraint" call above), then create them
		 * now.  We do this *after* dropping all dependent
		 * constraints because we don't want to waste time
		 * creating a new conglomerate if it's just going to be
		 * dropped again as part of another "drop constraint".
		 */
    createNewBackingCongloms(newCongloms, (long[]) null);
    /*
         * The work we've done above, specifically the possible
         * dropping of primary key, foreign key, and unique constraints
         * and their underlying indexes, may have affected the table
         * descriptor. By re-reading the table descriptor here, we
         * ensure that the compressTable code is working with an
         * accurate table descriptor. Without this line, we may get
         * conglomerate-not-found errors and the like due to our
         * stale table descriptor.
         */
    td = dd.getTableDescriptor(tableId);
    compressTable();
    ColumnDescriptorList tab_cdl = td.getColumnDescriptorList();
    // drop the column from syscolumns
    dd.dropColumnDescriptor(td.getUUID(), columnName, tc);
    ColumnDescriptor[] cdlArray = new ColumnDescriptor[size - columnDescriptor.getPosition()];
    // 
    for (int i = columnDescriptor.getPosition(), j = 0; i < size; i++, j++) {
        ColumnDescriptor cd = tab_cdl.elementAt(i);
        dd.dropColumnDescriptor(td.getUUID(), cd.getColumnName(), tc);
        cd.setPosition(i);
        if (cd.isAutoincrement()) {
            cd.setAutoinc_create_or_modify_Start_Increment(ColumnDefinitionNode.CREATE_AUTOINCREMENT);
        }
        cdlArray[j] = cd;
    }
    dd.addDescriptorArray(cdlArray, td, DataDictionary.SYSCOLUMNS_CATALOG_NUM, false, tc);
    // By this time, the column has been removed from the table descriptor.
    // Now, go through all the triggers and regenerate their trigger action
    // SPS and rebind the generated trigger action sql. If the trigger
    // action is using the dropped column, it will get detected here. If
    // not, then we will have generated the internal trigger action sql
    // which matches the trigger action sql provided by the user.
    // 
    // eg of positive test case
    // create table atdc_16_tab1 (a1 integer, b1 integer, c1 integer);
    // create table atdc_16_tab2 (a2 integer, b2 integer, c2 integer);
    // create trigger atdc_16_trigger_1
    // after update of b1 on atdc_16_tab1
    // REFERENCING NEW AS newt
    // for each row
    // update atdc_16_tab2 set c2 = newt.c1
    // The internal representation for the trigger action before the column
    // is dropped is as follows
    // update atdc_16_tab2 set c2 =
    // org.apache.derby.iapi.db.Factory::getTriggerExecutionContext().
    // getONewRow().getInt(3)
    // After the drop column shown as below
    // alter table DERBY4998_SOFT_UPGRADE_RESTRICT drop column c11
    // The above internal representation of tigger action sql is not
    // correct anymore because column position of c1 in atdc_16_tab1 has
    // now changed from 3 to 2. Following while loop will regenerate it and
    // change it to as follows
    // update atdc_16_tab2 set c2 =
    // org.apache.derby.iapi.db.Factory::getTriggerExecutionContext().
    // getONewRow().getInt(2)
    // 
    // We could not do this before the actual column drop, because the
    // rebind would have still found the column being dropped in the
    // table descriptor and hence use of such a column in the trigger
    // action rebind would not have been caught.
    // For the table on which ALTER TABLE is getting performed, find out
    // all the SPSDescriptors that use that table as a provider. We are
    // looking for SPSDescriptors that have been created internally for
    // trigger action SPSes. Through those SPSDescriptors, we will be
    // able to get to the triggers dependent on the table being altered
    // Following will get all the dependent objects that are using
    // ALTER TABLE table as provider
    List<DependencyDescriptor> depsOnAlterTableList = dd.getProvidersDescriptorList(td.getObjectID().toString());
    for (DependencyDescriptor depOnAT : depsOnAlterTableList) {
        // Go through all the dependent objects on the table being altered
        DependableFinder dependent = depOnAT.getDependentFinder();
        // stored prepared statement.
        if (dependent.getSQLObjectType().equals(Dependable.STORED_PREPARED_STATEMENT)) {
            // Look for all the dependent objects that are using this
            // stored prepared statement as provider. We are only
            // interested in dependents that are triggers.
            List<DependencyDescriptor> depsTrigger = dd.getProvidersDescriptorList(depOnAT.getUUID().toString());
            for (DependencyDescriptor depsTriggerDesc : depsTrigger) {
                DependableFinder providerIsTrigger = depsTriggerDesc.getDependentFinder();
                // it is a trigger
                if (providerIsTrigger.getSQLObjectType().equals(Dependable.TRIGGER)) {
                    // Drop and recreate the trigger after regenerating
                    // it's trigger action plan. If the trigger action
                    // depends on the column being dropped, it will be
                    // caught here.
                    TriggerDescriptor trdToBeDropped = dd.getTriggerDescriptor(depsTriggerDesc.getUUID());
                    // First check for dependencies in the trigger's WHEN
                    // clause, if there is one.
                    UUID whenClauseId = trdToBeDropped.getWhenClauseId();
                    boolean gotDropped = false;
                    if (whenClauseId != null) {
                        gotDropped = columnDroppedAndTriggerDependencies(trdToBeDropped, whenClauseId, true, cascade, columnName);
                    }
                    // dependencies.
                    if (!gotDropped) {
                        columnDroppedAndTriggerDependencies(trdToBeDropped, trdToBeDropped.getActionId(), false, cascade, columnName);
                    }
                }
            }
        }
    }
    // Adjust the column permissions rows in SYSCOLPERMS to reflect the
    // changed column positions due to the dropped column:
    dd.updateSYSCOLPERMSforDropColumn(td.getUUID(), tc, columnDescriptor);
    // remove column descriptor from table descriptor. this fixes up the
    // list in case we were called recursively in order to cascade-drop a
    // dependent generated column.
    tab_cdl.remove(td.getColumnDescriptor(columnName));
}

Example 74 with ColumnDescriptor

use of org.apache.derby.iapi.sql.dictionary.ColumnDescriptor in project derby by apache.

the class AlterTableConstantAction method addNewColumnToTable.

/**
 * Workhorse for adding a new column to a table.
 *
 * @param   ix 			the index of the column specfication in the ALTER
 *						statement-- currently we allow only one.
 * @exception StandardException 	thrown on failure.
 */
private void addNewColumnToTable(int ix) throws StandardException {
    ColumnDescriptor columnDescriptor = td.getColumnDescriptor(columnInfo[ix].name);
    DataValueDescriptor storableDV;
    int colNumber = td.getMaxColumnID() + ix;
    /* We need to verify that the table does not have an existing
		 * column with the same name before we try to add the new
		 * one as addColumnDescriptor() is a void method.
		 */
    if (columnDescriptor != null) {
        throw StandardException.newException(SQLState.LANG_OBJECT_ALREADY_EXISTS_IN_OBJECT, columnDescriptor.getDescriptorType(), columnInfo[ix].name, td.getDescriptorType(), td.getQualifiedName());
    }
    if (columnInfo[ix].defaultValue != null)
        storableDV = columnInfo[ix].defaultValue;
    else
        storableDV = columnInfo[ix].dataType.getNull();
    // Add the column to the conglomerate.(Column ids in store are 0-based)
    tc.addColumnToConglomerate(td.getHeapConglomerateId(), colNumber, storableDV, columnInfo[ix].dataType.getCollationType());
    UUID defaultUUID = columnInfo[ix].newDefaultUUID;
    /* Generate a UUID for the default, if one exists
		 * and there is no default id yet.
		 */
    if (columnInfo[ix].defaultInfo != null && defaultUUID == null) {
        defaultUUID = dd.getUUIDFactory().createUUID();
    }
    // Add the column to syscolumns.
    // Column ids in system tables are 1-based
    columnDescriptor = new ColumnDescriptor(columnInfo[ix].name, colNumber + 1, columnInfo[ix].dataType, columnInfo[ix].defaultValue, columnInfo[ix].defaultInfo, td, defaultUUID, columnInfo[ix].autoincStart, columnInfo[ix].autoincInc, columnInfo[ix].autoinc_create_or_modify_Start_Increment, columnInfo[ix].autoincCycle);
    dd.addDescriptor(columnDescriptor, td, DataDictionary.SYSCOLUMNS_CATALOG_NUM, false, tc);
    // now add the column to the tables column descriptor list.
    td.getColumnDescriptorList().add(columnDescriptor);
    if (columnDescriptor.isAutoincrement()) {
        // 
        // Create a sequence generator for the auto-increment column.
        // See DERBY-6542.
        // 
        CreateSequenceConstantAction csca = CreateTableConstantAction.makeCSCA(columnInfo[ix], TableDescriptor.makeSequenceName(td.getUUID()));
        csca.executeConstantAction(activation);
    }
    // Update the new column to its default, if it has a non-null default
    if (columnDescriptor.isAutoincrement() || columnDescriptor.hasNonNullDefault()) {
        updateNewColumnToDefault(columnDescriptor);
    }
    // 
    // Add dependencies. These can arise if a generated column depends
    // on a user created function.
    // 
    addColumnDependencies(lcc, dd, td, columnInfo[ix]);
    // Update SYSCOLPERMS table which tracks the permissions granted
    // at columns level. The sytem table has a bit map of all the columns
    // in the user table to help determine which columns have the
    // permission granted on them. Since we are adding a new column,
    // that bit map needs to be expanded and initialize the bit for it
    // to 0 since at the time of ADD COLUMN, no permissions have been
    // granted on that new column.
    // 
    dd.updateSYSCOLPERMSforAddColumnToUserTable(td.getUUID(), tc);
}

Example 75 with ColumnDescriptor

use of org.apache.derby.iapi.sql.dictionary.ColumnDescriptor in project derby by apache.

the class AlterTableConstantAction method modifyColumnType.

private void modifyColumnType(int ix) throws StandardException {
    ColumnDescriptor columnDescriptor = td.getColumnDescriptor(columnInfo[ix].name);
    ColumnDescriptor newColumnDescriptor = new ColumnDescriptor(columnInfo[ix].name, columnDescriptor.getPosition(), columnInfo[ix].dataType, columnDescriptor.getDefaultValue(), columnDescriptor.getDefaultInfo(), td, columnDescriptor.getDefaultUUID(), columnInfo[ix].autoincStart, columnInfo[ix].autoincInc, columnInfo[ix].autoincCycle);
    // Update the ColumnDescriptor with new default info
    dd.dropColumnDescriptor(td.getUUID(), columnInfo[ix].name, tc);
    dd.addDescriptor(newColumnDescriptor, td, DataDictionary.SYSCOLUMNS_CATALOG_NUM, false, tc);
}