我无法从 kotlin 中的数据库中删除选定的 ID 数据

Question

What should I do at this stage to delete the selected id? I tried all the ways I could think of. thanks

val db = this.writableDatabase
db.delete(table_name, null, null)


val db = this.writableDatabase
db.delete(table_name, "$col_id=?", arrayOf(itemId.toString()) )
    Toast.makeText(context, "Silindi", Toast.LENGTH_LONG).show()
    db.close()

Answer 1

Try executing a delete query like this

val sql = "DELETE FROM $table_name WHERE $col_id = $itemId"
db.execSQL(sql)

Then show the Toast message to indicate that the item has been deleted, and close the database connection afterwards.