Examples with ViewImpl org.datanucleus.store.rdbms.table.ViewImpl used on opensource projects

Example 1 with ViewImpl

use of org.datanucleus.store.rdbms.table.ViewImpl in project datanucleus-rdbms by datanucleus.

the class DeleteTablesSchemaTransaction method run.

/* (non-Javadoc)
     * @see org.datanucleus.store.rdbms.AbstractSchemaTransaction#run(org.datanucleus.ClassLoaderResolver)
     */
protected void run(ClassLoaderResolver clr) throws SQLException {
    synchronized (rdbmsMgr) {
        boolean success = true;
        try {
            NucleusLogger.DATASTORE_SCHEMA.debug(Localiser.msg("050045", rdbmsMgr.getCatalogName(), rdbmsMgr.getSchemaName()));
            // Build up map of tables and views TODO Why use maps?
            Map baseTablesByName = new HashMap();
            Map viewsByName = new HashMap();
            for (Iterator i = storeDataMgr.getManagedStoreData().iterator(); i.hasNext(); ) {
                RDBMSStoreData data = (RDBMSStoreData) i.next();
                if (NucleusLogger.DATASTORE_SCHEMA.isDebugEnabled()) {
                    NucleusLogger.DATASTORE_SCHEMA.debug(Localiser.msg("050046", data.getName()));
                }
                // If the class has a table/view to remove, add it to the list
                if (data.hasTable()) {
                    if (data.mapsToView()) {
                        viewsByName.put(data.getDatastoreIdentifier(), data.getTable());
                    } else {
                        baseTablesByName.put(data.getDatastoreIdentifier(), data.getTable());
                    }
                }
            }
            // Remove views
            Iterator viewsIter = viewsByName.values().iterator();
            while (viewsIter.hasNext()) {
                ViewImpl view = (ViewImpl) viewsIter.next();
                if (writer != null) {
                    try {
                        if (view instanceof ClassView) {
                            writer.write("-- ClassView " + view.toString() + " for classes " + StringUtils.objectArrayToString(((ClassView) view).getManagedClasses()) + "\n");
                        }
                    } catch (IOException ioe) {
                        NucleusLogger.DATASTORE_SCHEMA.error("error writing DDL into file", ioe);
                    }
                    ((ViewImpl) viewsIter.next()).drop(getCurrentConnection());
                } else {
                    // Drop view if exists in the datastore
                    StoreSchemaData info = rdbmsMgr.getSchemaHandler().getSchemaData(getCurrentConnection(), RDBMSSchemaHandler.TYPE_COLUMNS, new Object[] { view });
                    if (info != null) {
                        ((ViewImpl) viewsIter.next()).drop(getCurrentConnection());
                    }
                }
            }
            // Remove table constraints
            Map<TableImpl, Boolean> schemaExistsForTableMap = new HashMap();
            Iterator tablesIter = baseTablesByName.values().iterator();
            while (tablesIter.hasNext()) {
                TableImpl tbl = (TableImpl) tablesIter.next();
                if (writer != null) {
                    try {
                        if (tbl instanceof ClassTable) {
                            writer.write("-- Constraints for ClassTable " + tbl.toString() + " for classes " + StringUtils.objectArrayToString(((ClassTable) tbl).getManagedClasses()) + "\n");
                        } else if (tbl instanceof JoinTable) {
                            writer.write("-- Constraints for JoinTable " + tbl.toString() + " for join relationship\n");
                        }
                    } catch (IOException ioe) {
                        NucleusLogger.DATASTORE_SCHEMA.error("error writing DDL into file", ioe);
                    }
                    tbl.dropConstraints(getCurrentConnection());
                } else {
                    // Drop constraints if exists in the datastore
                    boolean exists = false;
                    try {
                        // Check table type as way of detecting existence
                        String tableType = ((RDBMSSchemaHandler) rdbmsMgr.getSchemaHandler()).getTableType(getCurrentConnection(), tbl);
                        if (tableType != null) {
                            exists = true;
                        }
                    } catch (Exception e) {
                        exists = false;
                    }
                    schemaExistsForTableMap.put(tbl, exists);
                    if (exists) {
                        tbl.dropConstraints(getCurrentConnection());
                    }
                }
            }
            // Remove tables
            tablesIter = baseTablesByName.values().iterator();
            while (tablesIter.hasNext()) {
                TableImpl tbl = (TableImpl) tablesIter.next();
                if (writer != null) {
                    try {
                        if (tbl instanceof ClassTable) {
                            writer.write("-- ClassTable " + tbl.toString() + " for classes " + StringUtils.objectArrayToString(((ClassTable) tbl).getManagedClasses()) + "\n");
                        } else if (tbl instanceof JoinTable) {
                            writer.write("-- JoinTable " + tbl.toString() + " for join relationship\n");
                        }
                    } catch (IOException ioe) {
                        NucleusLogger.DATASTORE_SCHEMA.error("error writing DDL into file", ioe);
                    }
                    tbl.drop(getCurrentConnection());
                } else {
                    // Drop table if exists in the datastore
                    Boolean schemaExists = schemaExistsForTableMap.get(tbl);
                    if (schemaExists != null && schemaExists == Boolean.TRUE) {
                        tbl.drop(getCurrentConnection());
                    }
                }
            }
        } catch (Exception e) {
            success = false;
            String errorMsg = Localiser.msg("050047", e);
            NucleusLogger.DATASTORE_SCHEMA.error(errorMsg);
            throw new NucleusUserException(errorMsg, e);
        }
        if (!success) {
            throw new NucleusException("DeleteTables operation failed");
        }
    }
}