Question

使用SQLiteOpenHelper创建数据库：

@Override
public void onCreate(SQLiteDatabase sqLiteDatabase) {
    String SQL_CREATE_INVENTORY_TABLE = "CREATE TABLE " + InventoryEntry.TABLE_NAME + "("
            + InventoryEntry._ID + " INTEGER PRIMARY KEY AUTOINCREMENT, "
            + InventoryEntry.COLUMN_PRODUCT_IMAGE + " BLOB, "
            + InventoryEntry.COLUMN_PRODUCT_NAME + " TEXT NOT NULL, "
            + InventoryEntry.COLUMN_PRODUCT_PRICE + " REAL NOT NULL, "
            + InventoryEntry.COLUMN_PRODUCT_QUANTITY + " INTEGER, "
            + InventoryEntry.COLUMN_PRODUCT_DESCRIPTION + " TEXT);";
    sqLiteDatabase.execSQL(SQL_CREATE_INVENTORY_TABLE);
}

所有常量都在合同中定义，这就是COLUMN_PRODUCT_IMAGE：

public static final String COLUMN_PRODUCT_IMAGE = "image";

在CursorAdapter中，将一些随机数据添加到数据库后，我尝试通过image方法访问bindView列：

@Override
public void bindView(View view, final Context context, Cursor cursor) {
    ImageView imageView = view.findViewById(R.id.product_image);
    byte [] bytes = cursor.getBlob(cursor.getColumnIndexOrThrow(InventoryEntry.COLUMN_PRODUCT_IMAGE));
    Bitmap bitmap = BitmapUtils.getBitmap(bytes);
    imageView.setImageBitmap(bitmap);
}

这会产生一个java.lang.IllegalArgumentException: column 'image' does not exist

我使用Windows cmd再次检查了数据库，如下所示：

sqlite> select * from inventory;
_id         image       name        price       quantity    description
----------  ----------  ----------  ----------  ----------  -----------
1                       ff          5.0         5           fds

存在“图像”列，为什么会出错？

Android SQLite数据库：执行时“列不存在”

0 个答案: