Search in sources :

Example 1 with HashIndex

use of org.h2.index.HashIndex in project h2database by h2database.

the class RegularTable method addIndex.

@Override
public Index addIndex(Session session, String indexName, int indexId, IndexColumn[] cols, IndexType indexType, boolean create, String indexComment) {
    if (indexType.isPrimaryKey()) {
        for (IndexColumn c : cols) {
            Column column = c.column;
            if (column.isNullable()) {
                throw DbException.get(ErrorCode.COLUMN_MUST_NOT_BE_NULLABLE_1, column.getName());
            }
            column.setPrimaryKey(true);
        }
    }
    boolean isSessionTemporary = isTemporary() && !isGlobalTemporary();
    if (!isSessionTemporary) {
        database.lockMeta(session);
    }
    Index index;
    if (isPersistIndexes() && indexType.isPersistent()) {
        int mainIndexColumn;
        if (database.isStarting() && database.getPageStore().getRootPageId(indexId) != 0) {
            mainIndexColumn = -1;
        } else if (!database.isStarting() && mainIndex.getRowCount(session) != 0) {
            mainIndexColumn = -1;
        } else {
            mainIndexColumn = getMainIndexColumn(indexType, cols);
        }
        if (mainIndexColumn != -1) {
            mainIndex.setMainIndexColumn(mainIndexColumn);
            index = new PageDelegateIndex(this, indexId, indexName, indexType, mainIndex, create, session);
        } else if (indexType.isSpatial()) {
            index = new SpatialTreeIndex(this, indexId, indexName, cols, indexType, true, create, session);
        } else {
            index = new PageBtreeIndex(this, indexId, indexName, cols, indexType, create, session);
        }
    } else {
        if (indexType.isHash()) {
            if (cols.length != 1) {
                throw DbException.getUnsupportedException("hash indexes may index only one column");
            }
            if (indexType.isUnique()) {
                index = new HashIndex(this, indexId, indexName, cols, indexType);
            } else {
                index = new NonUniqueHashIndex(this, indexId, indexName, cols, indexType);
            }
        } else if (indexType.isSpatial()) {
            index = new SpatialTreeIndex(this, indexId, indexName, cols, indexType, false, true, session);
        } else {
            index = new TreeIndex(this, indexId, indexName, cols, indexType);
        }
    }
    if (database.isMultiVersion()) {
        index = new MultiVersionIndex(index, this);
    }
    if (index.needRebuild() && rowCount > 0) {
        try {
            Index scan = getScanIndex(session);
            long remaining = scan.getRowCount(session);
            long total = remaining;
            Cursor cursor = scan.find(session, null, null);
            long i = 0;
            int bufferSize = (int) Math.min(rowCount, database.getMaxMemoryRows());
            ArrayList<Row> buffer = new ArrayList<>(bufferSize);
            String n = getName() + ":" + index.getName();
            int t = MathUtils.convertLongToInt(total);
            while (cursor.next()) {
                database.setProgress(DatabaseEventListener.STATE_CREATE_INDEX, n, MathUtils.convertLongToInt(i++), t);
                Row row = cursor.get();
                buffer.add(row);
                if (buffer.size() >= bufferSize) {
                    addRowsToIndex(session, buffer, index);
                }
                remaining--;
            }
            addRowsToIndex(session, buffer, index);
            if (SysProperties.CHECK && remaining != 0) {
                DbException.throwInternalError("rowcount remaining=" + remaining + " " + getName());
            }
        } catch (DbException e) {
            getSchema().freeUniqueName(indexName);
            try {
                index.remove(session);
            } catch (DbException e2) {
                // this could happen, for example on failure in the storage
                // but if that is not the case it means
                // there is something wrong with the database
                trace.error(e2, "could not remove index");
                throw e2;
            }
            throw e;
        }
    }
    index.setTemporary(isTemporary());
    if (index.getCreateSQL() != null) {
        index.setComment(indexComment);
        if (isSessionTemporary) {
            session.addLocalTempTableIndex(index);
        } else {
            database.addSchemaObject(session, index);
        }
    }
    indexes.add(index);
    setModified();
    return index;
}
Also used : SpatialTreeIndex(org.h2.index.SpatialTreeIndex) PageDelegateIndex(org.h2.index.PageDelegateIndex) NonUniqueHashIndex(org.h2.index.NonUniqueHashIndex) PageBtreeIndex(org.h2.index.PageBtreeIndex) ArrayList(java.util.ArrayList) NonUniqueHashIndex(org.h2.index.NonUniqueHashIndex) Index(org.h2.index.Index) HashIndex(org.h2.index.HashIndex) ScanIndex(org.h2.index.ScanIndex) PageBtreeIndex(org.h2.index.PageBtreeIndex) TreeIndex(org.h2.index.TreeIndex) PageDataIndex(org.h2.index.PageDataIndex) PageDelegateIndex(org.h2.index.PageDelegateIndex) MultiVersionIndex(org.h2.index.MultiVersionIndex) SpatialTreeIndex(org.h2.index.SpatialTreeIndex) NonUniqueHashIndex(org.h2.index.NonUniqueHashIndex) HashIndex(org.h2.index.HashIndex) Cursor(org.h2.index.Cursor) Constraint(org.h2.constraint.Constraint) DbException(org.h2.message.DbException) TreeIndex(org.h2.index.TreeIndex) SpatialTreeIndex(org.h2.index.SpatialTreeIndex) MultiVersionIndex(org.h2.index.MultiVersionIndex) Row(org.h2.result.Row)

Aggregations

ArrayList (java.util.ArrayList)1 Constraint (org.h2.constraint.Constraint)1 Cursor (org.h2.index.Cursor)1 HashIndex (org.h2.index.HashIndex)1 Index (org.h2.index.Index)1 MultiVersionIndex (org.h2.index.MultiVersionIndex)1 NonUniqueHashIndex (org.h2.index.NonUniqueHashIndex)1 PageBtreeIndex (org.h2.index.PageBtreeIndex)1 PageDataIndex (org.h2.index.PageDataIndex)1 PageDelegateIndex (org.h2.index.PageDelegateIndex)1 ScanIndex (org.h2.index.ScanIndex)1 SpatialTreeIndex (org.h2.index.SpatialTreeIndex)1 TreeIndex (org.h2.index.TreeIndex)1 DbException (org.h2.message.DbException)1 Row (org.h2.result.Row)1