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  package org.apache.cayenne.dba.derby;
  
  import org.apache.cayenne.dba.JdbcAdapter;
  import org.apache.cayenne.dba.oracle.OraclePkGenerator;
  import org.apache.cayenne.map.DbEntity;
  
  /**
   * PK generator for Derby that uses sequences.
   *
   * @since 4.0 (old one used AUTO_PK_SUPPORT table)
   */
  public class DerbyPkGenerator extends OraclePkGenerator {
  
      /**
       * Used by DI
       * @since 4.1
       */
      public DerbyPkGenerator() {
          super();
      }
  
      DerbyPkGenerator(JdbcAdapter adapter) {
          super(adapter);
      }
  
      @Override
      protected String sequenceName(DbEntity entity) {
          return super.sequenceName(entity).toUpperCase();
      }
  
      @Override
      protected String selectNextValQuery(String pkGeneratingSequenceName) {
          return "VALUES (NEXT VALUE FOR " + pkGeneratingSequenceName + ")";
      }
  
      @Override
      protected String selectAllSequencesQuery() {
          return "SELECT SEQUENCENAME FROM SYS.SYSSEQUENCES";
      }
  
      @Override
      protected String dropSequenceString(DbEntity entity) {
          return "DROP SEQUENCE " + sequenceName(entity) + " RESTRICT";
      }
  
      @Override
      protected String createSequenceString(DbEntity entity) {
          return "CREATE SEQUENCE " + sequenceName(entity) + " AS BIGINT START WITH " + pkStartValue +
                  " INCREMENT BY " + getPkCacheSize() + " NO MAXVALUE NO CYCLE";
      }
  }
  