android-如何将图像存储到SQL中？

我想将图像存储到sqlite数据库中。从其他类传递的名称、位置和说明以及用于res的图像。
当我尝试插入图像时，我得到了java.lang.NullPointerException。。

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请帮忙

没有堆栈跟踪很难说，但是您是否调用了ImplementsAppDB.open（）函数？这将初始化我们的ReportsDatabase

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还可以考虑将文件路径存储在SQLite DB中，而不是将整个图像存储在SQLite中。将图像存储在您自己的应用程序数据中，然后将文件路径存储在sqlite中。

在哪一行获得空指针例外情况此链接可能有助于您：

private static final String DATABASE_NAME2 = "asd";
private static final String DATABASE_TABLE2 = "myreportstable";
private static final int DATABASE_VERSION2 = 1;

private DatabaseHelper ourdatabaseHelper;
private final Context ourdbContext;
private SQLiteDatabase ourReportsDatabase;



private static class DatabaseHelper extends SQLiteOpenHelper {

    public DatabaseHelper(Context context) {
        super(context, DATABASE_NAME2, null, DATABASE_VERSION2);
        // TODO Auto-generated constructor stub

    }

    @Override
    public void onCreate(SQLiteDatabase db) {
        // TODO Auto-generated method stub
        db.execSQL("CREATE TABLE " + DATABASE_TABLE2 + " (" + KEY_ROWID2
                + " INTEGER PRIMARY KEY AUTOINCREMENT, " + KEY_NAME2
                + " TEXT NOT NULL, " + KEY_LOCATION2 + " TEXT NOT NULL, "
                + KEY_DISCREPTION2 + " TEXT NOT NULL, " +KEY_IMG2+" BLOB NOT NULL);");

    }

    @Override
    public void onUpgrade(SQLiteDatabase db, int arg1, int arg2) {
        // TODO Auto-generated method stub
        db.execSQL("DROP TABLE IF EXISTS " + DATABASE_TABLE2);
        onCreate(db);
    }

}

public ImplementsAppDB(Context c) {
    ourdbContext = c;
}

public ImplementsAppDB open() throws SQLException {
    ourdatabaseHelper = new DatabaseHelper(ourdbContext);
    ourReportsDatabase = ourdatabaseHelper.getWritableDatabase();
    return this;
}

public void close() {
    ourdatabaseHelper.close();


}

public long CreateEntry(String name, String locationRP, String DiscreptionRP) {
    // TODO Auto-generated method stub

    Bitmap image = BitmapFactory.decodeResource(getResources(), R.drawable.home);

    ByteArrayOutputStream out = new ByteArrayOutputStream();

    image.compress(Bitmap.CompressFormat.PNG, 100, out);


    ContentValues cv = new ContentValues();
    cv.put(KEY_NAME2, name);
    cv.put(KEY_LOCATION2, locationRP);
    cv.put(KEY_DISCREPTION2, DiscreptionRP);
    cv.put(KEY_IMG2, out.toByteArray());

    return ourReportsDatabase.insert(DATABASE_TABLE2, null, cv);
}