Question

我有1500多个此类的项目存储在数据库中：

public class Task implements Parcelable{

    @DatabaseField(dataType = DataType.LONG, id = true)
    private long ActionId;
    @DatabaseField(dataType = DataType.STRING)
    private String Text;
    @DatabaseField(dataType = DataType.STRING)
    private String actionText;
    @DatabaseField(dataType = DataType.BOOLEAN)
    private boolean isUrgent;
    @DatabaseField(dataType = DataType.BOOLEAN)
    private boolean isImportant;
    @DatabaseField(dataType = DataType.BOOLEAN)
    private boolean isCompleted;
    @DatabaseField(dataType = DataType.STRING)
    private String description;
    @DatabaseField(dataType = DataType.BOOLEAN)
    private boolean isDeleted;
    @DatabaseField(foreign = true, foreignAutoRefresh = true, canBeNull = true, index = true)
    private Role role;
    @DatabaseField(foreign = true, foreignAutoRefresh = true, canBeNull = true, index = true)
    private List list;
    @DatabaseField(dataType = DataType.BOOLEAN)
    private boolean isWeekly;
    @DatabaseField(dataType = DataType.STRING)
    private String Date;
    @DatabaseField(dataType = DataType.LONG_OBJ)
    Long ActionListId;
    @DatabaseField(dataType = DataType.LONG_OBJ)
    private Long createdAt;
    @DatabaseField(dataType = DataType.LONG_OBJ)
    private Long updatedAt;
    @DatabaseField(dataType = DataType.LONG_OBJ)
    private Long deletedAt;
    @DatabaseField(dataType = DataType.BOOLEAN)
    private boolean isNew;  
    @DatabaseField(dataType = DataType.LONG_OBJ)
    private Long roleId;
    @DatabaseField(dataType = DataType.LONG_OBJ)
    private Long WorkspaceId;
    @DatabaseField(dataType = DataType.INTEGER)
    private int order;
    @DatabaseField(dataType = DataType.STRING)
    private String WeekDate;
    @Override
    public boolean equals(Object o) {
        if(o instanceof Task) {
             Task task = (Task)o;
             if(task.getActionId() == this.getActionId())
                  return true;
             return false;
        } else return false;
    }

    @Override
    public String toString() {
        return "Name : " + Text;
    }
}

这是这两个外国班的代码：

public class Role implements Parcelable{

    @DatabaseField(dataType = DataType.LONG, id = true)
    long id;
    @DatabaseField(dataType = DataType.STRING)
    String date;
    @DatabaseField(dataType = DataType.STRING)
    String Text;
    @DatabaseField(dataType = DataType.STRING)
    String Color;
    @DatabaseField(dataType = DataType.LONG) 
    long WorkspaceId;
    @DatabaseField(dataType = DataType.INTEGER)
    int Momentum;
    @DatabaseField(dataType = DataType.BOOLEAN)
    boolean isDeleted;
    @DatabaseField(dataType = DataType.LONG_OBJ)
    Long createdAt;
    @DatabaseField(dataType = DataType.LONG_OBJ)
    Long editedAt;
    @DatabaseField(dataType = DataType.LONG_OBJ)
    Long deletedAt;
    @DatabaseField(dataType = DataType.BOOLEAN)
    boolean isNew;
    @DatabaseField(dataType = DataType.INTEGER)
    private int year;
    @DatabaseField(dataType = DataType.INTEGER)
    private int month;
    @DatabaseField(dataType = DataType.INTEGER)
    private int day;
    @DatabaseField(dataType = DataType.LONG_OBJ)
    private Long UserId;
    @DatabaseField(dataType = DataType.STRING)
    private String UserName;
    @DatabaseField(dataType = DataType.INTEGER)
    private int order;
}
public class List  {

    @DatabaseField(dataType = DataType.INTEGER, generatedId = true)
    private int id;
    @DatabaseField(dataType = DataType.LONG)
    private long ActionListId = -1;
    @DatabaseField(dataType = DataType.STRING)
    private String Name;
    @DatabaseField(dataType = DataType.LONG)
    private long WorkspaceId;
    @DatabaseField(dataType = DataType.STRING)
    private String day;
    @DatabaseField(dataType = DataType.SERIALIZABLE, canBeNull = true)
    private int[] date;
    @DatabaseField(dataType = DataType.BOOLEAN)
    private boolean parkingLot;
    @DatabaseField(dataType = DataType.LONG_OBJ)
    private Long CreatedAt;
    @DatabaseField(dataType = DataType.LONG_OBJ)
    private Long EditedAt;
    @DatabaseField(dataType = DataType.LONG_OBJ)
    private Long DeletedAt;
    @DatabaseField(dataType = DataType.BOOLEAN)
    private boolean IsDeleted;
    @DatabaseField(dataType = DataType.BOOLEAN)
    private boolean isNew;
    @DatabaseField(dataType = DataType.INTEGER)
    private int taskCount;
    @DatabaseField(dataType = DataType.INTEGER)
    private int Order;
}

注意：我已经阅读了这些帖子：ORMLite poor performance on Android?，这：Ormlite DAO in android getting really slow when querying more than few thousand results，How can I improve this method of loading objects with ORMLite on Android? 而且我也读到了这个：ORMLite's createOrUpdate seems slow - what is normal speed?，事实上，这1500多个项目的创建很顺利，但这个查询工作得太慢了：

      try {
            dao = (TaskDao) DatabaseSingleton.getDAO(Task.class);
            QueryBuilder<Task, Integer> qB = dao.queryBuilder();
            qB.where().eq("WorkspaceId", workspaceId).and().eq("isDeleted", false);
            CloseableIterator<Task> iterator = dao.iterator(qB.prepare());
             try {
                 while (iterator.hasNext()) {
                     Task item  = iterator.next();
                     ActionDto outputItem = new ActionDto(item);
                     list.add(outputItem);
                 }
             } finally {
                 iterator.close();
             }
        } catch (SQLException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }

所以迭代器在这里没有帮助

另一个注意事项：我读过缓慢的注释，并且它已经在Gingerbread中修复了，所以我想告诉我正在使用哪些设备：

Samsung GT-S5660 Galaxy Gio 2.3.3 API
GenyMotion Nexus 5模拟器4.4.2
Nexus 7 with 4.1.2 API

它对所有人来说都很慢，我认为它可能与我课程中的大量LONG_OBJECT以及每个LONG_OBJECT中的字段数量有关，但实际上需要花费很多时间来加载1500多个项目（ 持续10秒以上）

而且我真的不想改变ORM，因为除了这种情况，ORMLite对我来说效果很好

修改：由于评论中有回复，我不得不说只有qB.query()与iterator循环相同的时间

ORMLite在加载时工作太慢

0 个答案: