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  package org.apache.cayenne.dba.h2;
  
  import org.apache.cayenne.dba.JdbcAdapter;
  import org.apache.cayenne.dba.oracle.OraclePkGenerator;
  import org.apache.cayenne.map.DbEntity;
  
  /**
   * Default PK generator for H2 that uses sequences for PK generation.
   *
   * @since 4.0
   */
  public class H2PkGenerator extends OraclePkGenerator {
  
      /**
       * Used by DI
       * @since 4.1
       */
      public H2PkGenerator() {
          super();
      }
  
      protected H2PkGenerator(JdbcAdapter adapter) {
          super(adapter);
      }
  
      @Override
      protected String createSequenceString(DbEntity ent) {
          return "CREATE SEQUENCE " + sequenceName(ent) + " START WITH " + pkStartValue + " INCREMENT BY "
                  + pkCacheSize(ent) + " CACHE 1";
      }
  
      @Override
      protected String selectNextValQuery(String sequenceName) {
          return "SELECT NEXT VALUE FOR " + sequenceName;
      }
  
      @Override
      protected String selectAllSequencesQuery() {
          return "SELECT LOWER(sequence_name) FROM Information_Schema.Sequences";
      }
  }
  