Пример #1
0
  /**
   * Method to reserve a block of identities. Note : Only allocates a single id always.
   *
   * @param size The block size
   * @return The reserved block
   */
  public ValueGenerationBlock reserveBlock(long size) {
    // search an Id in the database
    PreparedStatement ps = null;
    ResultSet rs = null;
    RDBMSStoreManager rdbmsMgr = (RDBMSStoreManager) storeMgr;
    SQLController sqlControl = rdbmsMgr.getSQLController();
    try {
      String stmt = getStatement();
      ps = sqlControl.getStatementForUpdate(connection, stmt, false);

      rs = sqlControl.executeStatementQuery(null, connection, stmt, ps);
      if (!rs.next()) {
        return new ValueGenerationBlock(new Object[] {Long.valueOf(1)});
      }

      return new ValueGenerationBlock(new Object[] {Long.valueOf(rs.getLong(1) + 1)});
    } catch (SQLException e) {
      // TODO adds a message correspondent to the exception.
      // we need to work to create user friendly messages
      throw new ValueGenerationException(e.getMessage());
    } finally {
      try {
        if (rs != null) {
          rs.close();
        }
        if (ps != null) {
          sqlControl.closeStatement(connection, ps);
        }
      } catch (SQLException e) {
        // no recoverable error
      }
    }
  }
  public void executeClear(ObjectProvider ownerOP) {
    String clearStmt = getClearStmt();
    try {
      ExecutionContext ec = ownerOP.getExecutionContext();
      ManagedConnection mconn = storeMgr.getConnection(ec);
      SQLController sqlControl = storeMgr.getSQLController();
      try {
        PreparedStatement ps = sqlControl.getStatementForUpdate(mconn, clearStmt, false);
        try {
          int jdbcPosition = 1;
          jdbcPosition =
              BackingStoreHelper.populateOwnerInStatement(ownerOP, ec, ps, jdbcPosition, this);
          if (getRelationDiscriminatorMapping() != null) {
            BackingStoreHelper.populateRelationDiscriminatorInStatement(ec, ps, jdbcPosition, this);
          }

          sqlControl.executeStatementUpdate(ec, mconn, clearStmt, ps, true);
        } finally {
          sqlControl.closeStatement(mconn, ps);
        }
      } finally {
        mconn.release();
      }
    } catch (SQLException e) {
      throw new NucleusDataStoreException(Localiser.msg("056013", clearStmt), e);
    }
  }
  /**
   * Clear the association from owner to all elements. Provides cascade-delete when the elements
   * being deleted are PC types.
   *
   * @param ownerOP ObjectProvider for the container.
   */
  public void clear(ObjectProvider ownerOP) {
    Collection dependentElements = null;
    CollectionMetaData collmd = ownerMemberMetaData.getCollection();
    boolean dependent = collmd.isDependentElement();
    if (ownerMemberMetaData.isCascadeRemoveOrphans()) {
      dependent = true;
    }
    if (dependent && !collmd.isEmbeddedElement() && !collmd.isSerializedElement()) {
      // Retain the dependent elements that need deleting after clearing
      dependentElements = new HashSet();
      Iterator iter = iterator(ownerOP);
      while (iter.hasNext()) {
        dependentElements.add(iter.next());
      }
    }

    String clearStmt = getClearStmt();
    try {
      ExecutionContext ec = ownerOP.getExecutionContext();
      ManagedConnection mconn = storeMgr.getConnection(ec);
      SQLController sqlControl = storeMgr.getSQLController();
      try {
        PreparedStatement ps = sqlControl.getStatementForUpdate(mconn, clearStmt, false);
        try {
          int jdbcPosition = 1;
          jdbcPosition =
              BackingStoreHelper.populateOwnerInStatement(ownerOP, ec, ps, jdbcPosition, this);
          if (relationDiscriminatorMapping != null) {
            BackingStoreHelper.populateRelationDiscriminatorInStatement(ec, ps, jdbcPosition, this);
          }

          sqlControl.executeStatementUpdate(ec, mconn, clearStmt, ps, true);
        } finally {
          sqlControl.closeStatement(mconn, ps);
        }
      } finally {
        mconn.release();
      }
    } catch (SQLException e) {
      throw new NucleusDataStoreException(Localiser.msg("056013", clearStmt), e);
    }

    // Cascade-delete
    if (dependentElements != null && dependentElements.size() > 0) {
      Iterator iter = dependentElements.iterator();
      while (iter.hasNext()) {
        Object obj = iter.next();
        if (ownerOP.getExecutionContext().getApiAdapter().isDeleted(obj)) {
          // Element is tagged for deletion so will be deleted at flush(), and we dont need it
          // immediately
        } else {
          ownerOP.getExecutionContext().deleteObjectInternal(obj);
        }
      }
    }
  }