Question

Android数据库映射，使用dbcontract还是实体类?

Answer 1

Android数据库映射，使用dbcontract比较推荐：
举例如下：
package com.melissanoelle.groovebasin.data;

import android.content.ContentUris;
import android.net.Uri;
import android.provider.BaseColumns;

/**
* Created by mel on 2/21/15.
*/
public class DbContract {

public static final String CONTENT_AUTHORITY = "com.melissanoelle.groovebasin";
public static final Uri BASE_CONTENT_URI = Uri.parse("content://" + CONTENT_AUTHORITY);

public static final String PATH_GROOVEBASIN = "groovebasin";

public static final class GroovebasinEntry implements BaseColumns {
public static final String TABLE_NAME = "groovebasins";

public static final String COLUMN_NAME = "name";
public static final String COLUMN_URL = "url";

public static final Uri CONTENT_URI = BASE_CONTENT_URI.buildUpon().appendPath(PATH_GROOVEBASIN).build();

public static final String CONTENT_TYPE = "vnd.android.cursor.dir/" + CONTENT_AUTHORITY + "/" + PATH_GROOVEBASIN;
public static final String CONTENT_ITEM_TYPE = "vnd.android.cursor.item/" + CONTENT_AUTHORITY + "/" + PATH_GROOVEBASIN;

public static Uri buildGroovebasinUri(long id) {
return ContentUris.withAppendedId(CONTENT_URI, id);
}

public static Uri returnContentUri() { return CONTENT_URI; }
}
}

Answer 2

用过ORM以后就再也不想SQLHelper了。
开发效率上Orm方便很多很多。
如果的应用DB数据量很大，且对SQL性能敏感...那还是老老实实写DBHelper性能好一些。
否则就用Orm吧，省去大量开发工作。