1
嗨我試圖存儲和檢索圖像和sqlite數據庫。我的下面的代碼不起作用。我不確定我做了什麼錯誤。請幫忙。 我創建的數據庫表如下:android cursor.getBlob不工作
db = openOrCreateDatabase("StudentDB", Context.MODE_PRIVATE, null);
db.execSQL("CREATE TABLE IF NOT EXISTS student(rollno VARCHAR,
name VARCHAR,photo BLOB,marks VARCHAR);");
然後我插入字段
db.execSQL("INSERT INTO student VALUES('" + editRollno.getText() + "','" + editName.getText() + "','" + imageInByte + "','" + editMarks.getText() + "');");
其中imageInByte是其如下從庫之前分配一個字節[]變量:
ByteArrayOutputStream stream = new ByteArrayOutputStream();
yourImage.compress(Bitmap.CompressFormat.PNG, 100, stream);
imageInByte = stream.toByteArray();
當我試圖從數據庫檢索圖像它失敗:
Cursor c = db.rawQuery("SELECT * FROM student WHERE rollno='"
+ editRollno.getText() + "'", null);
if (c.moveToFirst()) {
editName.setText(c.getString(1));
editMarks.setText(c.getString(2));
byte[] image = c.getBlob(3);
ByteArrayInputStream imageStream = new ByteArrayInputStream(image);
theImage = BitmapFactory.decodeStream(imageStream);
imageView2.setImageBitmap(theImage);
}
嘗試編寫'editRollno.getText()。toString()'而不是'editRollno.getText()',併爲所有其他人做。 – Apurva 2015-03-02 14:07:37