Andriod数据库操作记录之创建与插入

获取外部存储（MTP看到的手机自身的存储，非T卡存储）路径

    public static File getExternalPrivateStorageFile(Context context, String fileName) {
        return new File(context.getExternalFilesDir(null), fileName);
    }

打开数据库

    private void openDatabase(@NonNull Context context) {
        if (null == sqlite) {
            String filename = "xxx.db";
            File f = Util.getExternalPrivateStorageFile(context, filename);
            sqlite = SQLiteDatabase.openOrCreateDatabase(f, null);
            sqlite.execSQL("CREATE TABLE IF NOT EXISTS " + TABLE_NAME
                    + " ("
                    + "id integer primary key autoincrement,"
                    + KEY_DATE + " TEXT NOT NULL, "
                    + KEY_LOCATION + " TEXT NOT NULL, "
                    + KEY_DETAIL + " TEXT NOT NULL);");
        }

向数据库内插入记录

    public void insertToDatabase(@NonNull BillBean bill)  {
        if (null == sqlite) {
            return;
        }

        sqlite.execSQL("INSERT INTO "+TABLE_NAME
                +"("
                +KEY_AMOUNT
                +","+KEY_DATE
                +","+KEY_LOCATION
                +","+KEY_DETAIL
                +") VALUES ("
                + bill.getAmount()
                + ", "" + getFormattedDateString(bill.getDate()) + """
                +","" + bill.getLocation()+ """
                +","" + bill.getDetail()+ """
                +");");
    }