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create table pic(picture Blob)
Cursor cursor = db_test.rawQuery("select picture from pic",null);
if (cursor != null && cursor.getCount() > 0){
Toast.makeText(this,"读取图片成功:" + cursor.getCount(),Toast.LENGTH_SHOW).show();
}
Cursor cursor = db_test.rawQuery("select picture from pic",null);
if (cursor != null && cursor.getCount() > 0 && cursor.moveToFirst()){
Toast.makeText(this,"读取图片成功:" + cursor.getCount(),Toast.LENGTH_SHOW).show();
}
else {
Toast.makeText(this,"读取图片失败" ,Toast.LENGTH_SHOW).show();
}