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  package org.apache.cayenne.dbsync.reverse.dbload;
  
  import java.sql.DatabaseMetaData;
  import java.sql.ResultSet;
  import java.sql.SQLException;
  
  import org.apache.cayenne.map.DbAttribute;
  import org.apache.cayenne.map.DbEntity;
  import org.apache.cayenne.dbsync.model.DetectedDbEntity;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  class PrimaryKeyLoader extends PerEntityLoader {
  
      private static final Logger LOGGER = LoggerFactory.getLogger(DbLoader.class);
  
      PrimaryKeyLoader(DbLoaderConfiguration config, DbLoaderDelegate delegate) {
          super(null, config, delegate);
      }
  
      @Override
      ResultSet getResultSet(DbEntity dbEntity, DatabaseMetaData metaData) throws SQLException {
          return metaData.getPrimaryKeys(dbEntity.getCatalog(), dbEntity.getSchema(), dbEntity.getName());
      }
  
      @Override
      void processResultSet(DbEntity dbEntity, DbLoadDataStore map, ResultSet rs) throws SQLException {
          String columnName = rs.getString("COLUMN_NAME");
          DbAttribute attribute = dbEntity.getAttribute(columnName);
          if (attribute == null) {
              // why an attribute might be null is not quiet clear
              // but there is a bug report 731406 indicating that it is
              // possible so just print the warning, and ignore
              LOGGER.warn("Can't locate attribute for primary key: " + columnName);
              return;
          }
  
          attribute.setPrimaryKey(true);
          ((DetectedDbEntity) dbEntity).setPrimaryKeyName(rs.getString("PK_NAME"));
      }
  }
  