IdentifierFactory idFactory = storeMgr.getIdentifierFactory();
// "SEQUENCE_NAME" column
sequenceNameMapping = storeMgr.getMappingManager().getMapping(String.class);
Column colSequenceName=(Column) addDatastoreField(String.class.getName(),
idFactory.newDatastoreFieldIdentifier(sequenceNameColumnName), sequenceNameMapping, null);
colSequenceName.setAsPrimaryKey();
colSequenceName.getColumnMetaData().setLength(Integer.valueOf("255"));
colSequenceName.getColumnMetaData().setJdbcType("VARCHAR");
getStoreManager().getMappingManager().createDatastoreMapping(sequenceNameMapping, colSequenceName, String.class.getName());