public boolean isSystemView(CatalogAndSchema schema, final String viewName) {
   schema = schema.customize(this);
   if ("information_schema".equalsIgnoreCase(schema.getSchemaName())) {
     return true;
   } else if (getSystemViews().contains(viewName)) {
     return true;
   }
   return false;
 }
 @Override
 public String getViewDefinition(CatalogAndSchema schema, final String viewName)
     throws DatabaseException {
   schema = schema.customize(this);
   String definition =
       (String)
           ExecutorService.getInstance()
               .getExecutor(this)
               .queryForObject(
                   new GetViewDefinitionStatement(
                       schema.getCatalogName(), schema.getSchemaName(), viewName),
                   String.class);
   if (definition == null) {
     return null;
   }
   return CREATE_VIEW_AS_PATTERN.matcher(definition).replaceFirst("");
 }
 @Override
 public String getViewDefinition(CatalogAndSchema schema, final String viewName)
     throws DatabaseException {
   schema = correctSchema(schema);
   List<Map> retList =
       ExecutorService.getInstance()
           .getExecutor(this)
           .queryForList(
               new GetViewDefinitionStatement(
                   schema.getCatalogName(), schema.getSchemaName(), viewName));
   // building the view definition from the multiple rows
   StringBuilder sb = new StringBuilder();
   for (Map rowMap : retList) {
     String s = (String) rowMap.get("VIEWTEXT");
     sb.append(s);
   }
   return CREATE_VIEW_AS_PATTERN.matcher(sb.toString()).replaceFirst("");
 }
  protected Table readTable(CachedRow tableMetadataResultSet, Database database)
      throws SQLException, DatabaseException {
    String rawTableName = tableMetadataResultSet.getString("TABLE_NAME");
    String rawSchemaName = StringUtils.trimToNull(tableMetadataResultSet.getString("TABLE_SCHEM"));
    String rawCatalogName = StringUtils.trimToNull(tableMetadataResultSet.getString("TABLE_CAT"));
    String remarks = StringUtils.trimToNull(tableMetadataResultSet.getString("REMARKS"));
    if (remarks != null) {
      remarks = remarks.replace("''", "'"); // come back escaped sometimes
    }

    Table table = new Table().setName(cleanNameFromDatabase(rawTableName, database));
    table.setRemarks(remarks);

    CatalogAndSchema schemaFromJdbcInfo =
        ((AbstractJdbcDatabase) database).getSchemaFromJdbcInfo(rawCatalogName, rawSchemaName);
    table.setSchema(
        new Schema(schemaFromJdbcInfo.getCatalogName(), schemaFromJdbcInfo.getSchemaName()));

    return table;
  }
 @Override
 public String getJdbcSchemaName(CatalogAndSchema schema) {
   return correctObjectName(
       schema.getCatalogName() == null ? schema.getSchemaName() : schema.getCatalogName(),
       Schema.class);
 }
 public String getJdbcSchemaName(final CatalogAndSchema schema) {
   return correctObjectName(schema.getSchemaName(), Schema.class);
 }
  @Override
  public Change[] fixMissing(
      DatabaseObject missingObject,
      DiffOutputControl control,
      Database referenceDatabase,
      Database comparisonDatabase,
      ChangeGeneratorChain chain) {
    List<Change> returnList = new ArrayList<Change>();

    PrimaryKey pk = (PrimaryKey) missingObject;

    AddPrimaryKeyChange change = new AddPrimaryKeyChange();
    change.setTableName(pk.getTable().getName());
    if (control.getIncludeCatalog()) {
      change.setCatalogName(pk.getTable().getSchema().getCatalogName());
    }
    if (control.getIncludeSchema()) {
      change.setSchemaName(pk.getTable().getSchema().getName());
    }
    change.setConstraintName(pk.getName());
    change.setColumnNames(pk.getColumnNames());
    if (control.getIncludeTablespace()) {
      change.setTablespace(pk.getTablespace());
    }

    if (referenceDatabase instanceof MSSQLDatabase
        && pk.getBackingIndex() != null
        && pk.getBackingIndex().getClustered() != null
        && !pk.getBackingIndex().getClustered()) {
      change.setClustered(false);
    }

    if (comparisonDatabase instanceof OracleDatabase
        || (comparisonDatabase instanceof DB2Database
            && pk.getBackingIndex() != null
            && !comparisonDatabase.isSystemObject(pk.getBackingIndex()))) {
      Index backingIndex = pk.getBackingIndex();
      if (backingIndex != null && backingIndex.getName() != null) {
        try {
          if (!control.getIncludeCatalog() && !control.getIncludeSchema()) {
            CatalogAndSchema schema =
                comparisonDatabase.getDefaultSchema().customize(comparisonDatabase);
            backingIndex
                .getTable()
                .setSchema(
                    schema.getCatalogName(),
                    schema
                        .getSchemaName()); // set table schema so it is found in the correct schema
          }
          if (referenceDatabase.equals(comparisonDatabase)
              || !SnapshotGeneratorFactory.getInstance().has(backingIndex, comparisonDatabase)) {
            Change[] fixes =
                ChangeGeneratorFactory.getInstance()
                    .fixMissing(backingIndex, control, referenceDatabase, comparisonDatabase);

            if (fixes != null) {
              for (Change fix : fixes) {
                if (fix != null) {
                  returnList.add(fix);
                }
              }
            }
          }
        } catch (Exception e) {
          throw new UnexpectedLiquibaseException(e);
        }

        change.setForIndexName(backingIndex.getName());
        Schema schema = backingIndex.getSchema();
        if (schema != null) {
          if (control.getIncludeCatalog()) {
            change.setForIndexCatalogName(schema.getCatalogName());
          }
          if (control.getIncludeSchema()) {
            change.setForIndexSchemaName(schema.getName());
          }
        }
      }
    }

    control.setAlreadyHandledMissing(pk.getBackingIndex());
    returnList.add(change);

    return returnList.toArray(new Change[returnList.size()]);
  }