表中未完成Android sqlite更新

Question

Following is my code for update record done.

try {
                String str_edit = edit_note.getText().toString();
                Toast.makeText(getApplicationContext(), str_edit,
                        Toast.LENGTH_LONG).show();
                                    Toast.LENGTH_LONG).show();
        String      rawQuery="UPDATE " + GlobalVariable.getstr_tbl_name()
                        + " SET note = '" + str_edit + "' where name = '"
                        + str + "' ";
                db.execSQL(rawQuery);
            } catch (Exception e) {
                System.out.println(e.getMessage());
            }

Code for Display:

try {
            Cursor note_cursor = db.query(GlobalVariable.getstr_tbl_name(),
                    new String[] { "note" + " as note" }, "name" + "=?",
                    new String[] { GlobalVariable.getstr_food_name() }, null,
                    null, null);
            if (note_cursor.moveToFirst()) {
                int notecol = note_cursor.getColumnIndex("note");
                do {
                    String str = note_cursor.getString(notecol);
                    Toast.makeText(getApplicationContext(), str,
                            Toast.LENGTH_LONG).show();
                    edit_note.setText(str);
                } while (note_cursor.moveToNext());

            }
        }

        catch (Exception e) {
            System.out.println(e.getMessage());

        }

I am getting all variable value ie global variables and all but update does not reflects on table. What wrong i am done?

Answer 1

每当我们尝试更新数据库时，只需清理并卸载您的应用程序，然后再次安装，如果您发现正确，则在不卸载时可能会发生一些更改，请告诉其他明智的做法，我们将在下一个

Answer 2

Should int notecol = note_cursor.getColumnIndex("name"); instead be int notecol = note_cursor.getColumnIndex("note");

since in the first block of code you are updating note..

Answer 3

The problem is that you try to update your DB using a rawQuery method instead of a execSql . RawQuery is intended to retrieve data from your database, while execSql lets you

Execute a single SQL statement that is NOT a SELECT or any other SQL statement that returns data.

You can also consider to use public int update (String table, ContentValues values, String whereClause, String[] whereArgs) method.