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  package org.apache.cayenne.unit;
  
  import org.apache.cayenne.dba.DbAdapter;
  import org.apache.cayenne.map.DataMap;
  
  import java.sql.Connection;
  
  public class HSQLDBUnitDbAdapter extends UnitDbAdapter {
  
      public HSQLDBUnitDbAdapter(DbAdapter adapter) {
          super(adapter);
      }
  
      @Override
      public boolean supportsLobs() {
          return true;
      }
  
      /**
       * Note that out of all SP tests HSQLDB (as of 8.0.2) supports only updates that do
       * not return a ResultSet (see HSQL CallableStatement JavaDocs). Once HSQL implements
       * the rest of callable statement we can enable our unit test.
       */
      @Override
      public boolean supportsStoredProcedures() {
          return false;
      }
  
      @Override
      public boolean supportsHaving() {
          return false;
      }
  
      @Override
      public void createdTables(Connection con, DataMap map) throws Exception {
          if (map.getProcedureMap().containsKey("cayenne_tst_select_proc")) {
              executeDDL(con, "hsqldb", "create-sp-aliases.sql");
          }
      }
  
      /**
       * In HyperSQL, REAL, FLOAT, DOUBLE are equivalent and all mapped to double in Java
       * @see <a href="http://hsqldb.org/doc/guide/sqlgeneral-chapt.html#sgc_numeric_types">HSQLDB data types documentation</a>
       */
      @Override
      public boolean realAsDouble() {
          return true;
      }
  
      @Override
      public boolean supportsPKGeneratorConcurrency() {
          // HSQL is not locking AUTO_PK_TABLE, so running PkGenerator in parallel may result in conflicting ranges
          return false;
      }
  
      @Override
      public boolean supportsGeneratedKeysAdd() {
          return true;
      }
  
      @Override
      public boolean supportsGeneratedKeysDrop() {
          return true;
      }
  }
  