How to Convert Byte Array to Blob data type in Android

问题

I am just wondering, how can I convert from byte array to blob?

My database looks like this:

Photo
id (int)    |   image_key (blob)

This is my code:

 //this for getting data from picture
 Bitmap yourImage = extras.getParcelable("data");
 // convert bitmap to byte
 ByteArrayOutputStream stream = new ByteArrayOutputStream();
 yourImage.compress(Bitmap.CompressFormat.PNG, 100, stream);
 //the problem is right here, i want to convert this byte array, to a blob data type
 byte imageInByte[] = stream.toByteArray();

How can I convert this byte array into my database photo, and put it in field image_key (blob)? Because I tried but got an error. Can anybody help me about this error? Please I need help..

回答1:

I guess your code was

SQLiteDatabase.execSQL("INSERT INTO Photo (image_key) VALUES ('" + byteArray + "')");

That won't work because use byteArray will be converted to a String "B@421a0a0"

use SQLiteDatabase.execSQL(String sql, Object[] bindArgs) instead

SQLiteDatabase.execSQL("INSERT INTO Photo (image_key) VALUES (?)", byteArray);

This is called Prepared statement

来源：https://stackoverflow.com/questions/24276268/how-to-convert-byte-array-to-blob-data-type-in-android