code: protected Database createDatabase(Connection c, ResourceAccessor resourceAccessor) throws DatabaseException {
  
          DatabaseConnection liquibaseConnection;
          if (c == null) {
              log.warning(LogType.LOG,
                  "Null connection returned by liquibase datasource. Using offline unknown database");
              liquibaseConnection = new OfflineConnection("offline:unknown", resourceAccessor);
  
          } else {
              liquibaseConnection = new JdbcConnection(c);
          }
  
          Database database = DatabaseFactory.getInstance().findCorrectDatabaseImplementation(liquibaseConnection);
  		if (StringUtil.trimToNull(this.defaultSchema) != null) {
              if (database.supportsSchemas()) {
                  database.setDefaultSchemaName(this.defaultSchema);
              } else if (database.supportsCatalogs()) {
                  database.setDefaultCatalogName(this.defaultSchema);
              }
          }
          if (StringUtil.trimToNull(this.liquibaseSchema) != null) {
              if (database.supportsSchemas()) {
                  database.setLiquibaseSchemaName(this.liquibaseSchema);
              } else if (database.supportsCatalogs()) {
                  database.setLiquibaseCatalogName(this.liquibaseSchema);
              }
          }
          if (StringUtil.trimToNull(this.liquibaseTablespace) != null && database.supportsTablespaces()) {
              database.setLiquibaseTablespaceName(this.liquibaseTablespace);
          }
          if (StringUtil.trimToNull(this.databaseChangeLogTable) != null) {
              database.setDatabaseChangeLogTableName(this.databaseChangeLogTable);
          }
          if (StringUtil.trimToNull(this.databaseChangeLogLockTable) != null) {
              database.setDatabaseChangeLogLockTableName(this.databaseChangeLogLockTable);
          }
  		return database;
  	}
docs: Subclasses may override this method add change some database settings such as
  default schema before returning the database object.
  
  @param c
  @return a Database implementation retrieved from the {@link DatabaseFactory}.
  @throws DatabaseException