我编写了以下代码用于将视频字节插入数据库
DBAdapter.java
public void insertVideoBytesInVideoDownloadsTable(int id, byte[] videoBytes){
ContentDBHelper dbHelper = new ContentDBHelper(context);
sqliteDB = dbHelper.getWritableDatabase();
String sqlInsertVideoBytes = "Insert into " + tbl_video_downloads + " values (?, ?)";
Log.i(TAG, sqlInsertVideoBytes);
SQLiteStatement insertStatement = sqliteDB.compileStatement(sqlInsertVideoBytes);
insertStatement.clearBindings();
insertStatement.bindLong(1, id);
Log.i(TAG, "Inserted: "+id);
insertStatement.bindBlob(2, videoBytes);
Log.i(TAG, "Inserted: "+videoBytes);
insertStatement.executeInsert();
Log.i(TAG, "Execute inserted");
}
StoreVideoInDB.java
public String downloadAndStoreVideoInDB(String urlPath){
try {
Log.i(TAG , "URL " +urlPath);
URL url = new URL(urlPath);
URLConnection connection = url.openConnection();
connection.connect();
InputStream videoStream = connection.getInputStream();
BufferedInputStream videoBufferedStream = new BufferedInputStream(videoStream,128);
ByteArrayBuffer videoByteArray = new ByteArrayBuffer(500);
//Get the bytes one by one
int current = 0;
while((current = videoBufferedStream.read())!= -1){
videoByteArray.append((byte)current);
//Log.i(TAG, String.valueOf(current));
}
dbAdapter.insertVideoBytesInVideoDownloadsTable(id, videoByteArray.toByteArray());
}catch (IOException ex) {
Log.e(TAG, "error: " + ex.getMessage(), ex);
ex.printStackTrace();
}
return path;
}
DDMS 日志:
01-16 16:03:13.563: INFO/DronaDBAdapter(18235): Insert into video_downloads values (?, ?)
01-16 16:03:13.563: INFO/DBAdapter(18235): Inserted: 1
01-16 16:03:13.573: INFO/DBAdapter(18235): Inserted: [B@44f35120
01-16 16:03:13.653: INFO/DBAdapter(18235): Execute inserted
根据 DDMS,值 1(ID) 和 [B@44f35120 (Video Blob) 值已成功显示。但是它们没有插入到数据库中。
当我检查数据库并查询如下时:
select * from video_downloads;
结果:
1 |
第二个字段是空白的!没有插入 blob 值!为什么?我的代码有什么问题吗
最佳答案
我认为您误读了选择的输出。您的数据在那里,但“选择”不显示它,因为它不知道如何处理 blob。对于大多数类型的 blob,逐字输出其字节没有意义。
尝试从您的代码中读回数据,它会在那里。
关于android - 为什么 blob 值不存储在 android 中的 sqlite 数据库中,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/8879272/