使用ContentResolver操作ContentProvider中的数据

使用ContentResolver对ContentProvider中的数据进行添加、删除、修改和查询操作：

ContentResolver resolver =  getContentResolver();
Uri uri = Uri.parse("content://cn.itcast.provider.personprovider/person");

//添加一条记录
ContentValues values = new ContentValues();
values.put("name", "itcast");
values.put("age", 25);
resolver.insert(uri, values);  

       
//获取person表中所有记录
Cursor cursor = resolver.query(uri, null, null, null, "personid desc");
while(cursor.moveToNext()){
     Log.i("ContentTest", "personid="+ cursor.getInt(0)+ ",name="+ cursor.getString(1));
}

//把id为1的记录的name字段值更改新为liming
ContentValues updateValues = new ContentValues();
updateValues.put("name", "liming");
Uri updateIdUri = ContentUris.withAppendedId(uri, 2);
resolver.update(updateIdUri, updateValues, null, null);

//删除id为2的记录
Uri deleteIdUri = ContentUris.withAppendedId(uri, 2);
resolver.delete(deleteIdUri, null, null);