如何让 CSVWriter 将 blob 数据添加到单元格中

Question

我有一个允许用户在平板电脑上签名的应用程序，并且会生成一个图像。这部分我已经确认了，因为我可以在创建和保存图像后查看图像。

我正在使用以下代码将它们写入 .csv 文件。

//region - Create CSV file
            writer = new CSVWriter(new FileWriter(sdCardPath + "Orders_Summary_Report.csv"), ',', CSVWriter.NO_QUOTE_CHARACTER, CSVWriter.DEFAULT_ESCAPE_CHARACTER, "\r\n");
            //writer.writeNext(CSVcursor.getColumnNames()); //Write the column headings first before the looping starts
            String [] headings = ("Order Id,Item ID,Item Name,Item Price,Item Count,Item Total,Paid Amount,VOID Order,Payment Method,Order Signature,Member/Authorization,Tab Number,Order Time").split(",");
            writer.writeNext(headings);

            for(CSVcursor.moveToFirst(); !CSVcursor.isAfterLast(); CSVcursor.moveToNext()) //Loop through all results (use row count of table)
            {
                String[] entries = (CSVcursor.getInt(CSVcursor.getColumnIndex("orderId"))+ ","
                        +CSVcursor.getInt(CSVcursor.getColumnIndex("itemId"))+ ","
                        +CSVcursor.getString(CSVcursor.getColumnIndex("itemName"))+ ","
                        +CSVcursor.getString(CSVcursor.getColumnIndex("itemPrice")) + ","
                        +CSVcursor.getInt(CSVcursor.getColumnIndex("itemCount"))+ ","
                        +CSVcursor.getString(CSVcursor.getColumnIndex("itemTotal"))+ ","
                        +CSVcursor.getString(CSVcursor.getColumnIndex("orderPaid"))+ ","
                        +CSVcursor.getInt(CSVcursor.getColumnIndex("orderVoid"))+ ","
                        +CSVcursor.getString(CSVcursor.getColumnIndex("orderType"))+ ","
                        +CSVcursor.getBlob(CSVcursor.getColumnIndex("orderSignature"))+ ","
                        +CSVcursor.getString(CSVcursor.getColumnIndex("referenceId"))+ ","
                        +CSVcursor.getInt(CSVcursor.getColumnIndex("orderTab"))+ ","
                        +CSVcursor.getString(CSVcursor.getColumnIndex("orderTime"))).split(","); //Split the string by the delimiter
                writer.writeNext(entries); //Write current row of DB to file
                writer.flush(); //Flush the stream
            }
            writer.close();

文件写入成功，但当我查看 .csv 文件时，保存 blob 数据的列如下所示。

B@2342342 B@2123982 B@3952929

看来我只是在保存文件的签名或其他一些属性，而不是文件本身。

我是否需要通过 bit/buffer 将 blob 流式传输到 csv 文件中？

Answer 1

只是呼应@CommonsWare。正确的做法是将 blob 作为图像保存到磁盘。这样就可以很容易地检索它，以便在需要时将其嵌入到文件中。我仍然将我的图像作为 blob 保存到数据库中，并只在视图中显示它们。如果你想将这些文件放入 csv，我会考虑另一种类型，如 pdf。

如何让 CSVWriter 将 blob 数据添加到单元格中

How to get CSVWriter to add blob data into cell

android

sqlite

csv

blob

writer