Question

我现在已经工作了很长一段时间，而我能得到的最远的是将整个查询从数据库写入一行中的.CSV文件。

当我使用writeNext（string []）和下面的代码时，.csv写在一个长行上。

//Export the orders in the database to a CSV file.  Can be transferred from device either by USB or bluetooth
public void exportOrders(View view)
{
    try
    {
        CSVWriter writer;
        writer = new CSVWriter(new FileWriter("/sdcard/orders.csv"), ',');
        writer.writeNext(cursor.getColumnNames()); //Write the column headings first before the looping starts
        //Loop through all results (use row count of table)
        for(cursor.moveToFirst(); !cursor.isAfterLast(); cursor.moveToNext())
        {
            String[] entries = (cursor.getString(0)+ "," +cursor.getString(1)+ "," +cursor.getString(2)+ "," +cursor.getString(3)
                    + "," +cursor.getString(4)).split(","); //Split the string by the delimiter
            writer.writeNext(entries); //Write current row of DB to file
            writer.flush(); //Flush the stream
        }
        Toast.makeText(this, "Orders exported to .CSV successfully!", Toast.LENGTH_SHORT).show();
        writer.close();
    }
    catch (Exception erMsg)
    {
        Toast.makeText(this, erMsg.toString(), Toast.LENGTH_LONG).show();
        erMsg.printStackTrace();
    }
}

从我正在阅读的内容来看，这似乎就是这样做的方式，但我不知道如何从该代码生成新行？有没有办法将Cursor与新行一起使用，或者使用ResultSet和writeAll（结果）是标准的吗？

Answer 1

执行此操作的决议是使用正确的参数声明CSVWriter。这是新的构造函数：

writer = new CSVWriter(new FileWriter("/sdcard/orders.csv"), ',',  CSVWriter.NO_QUOTE_CHARACTER, CSVWriter.DEFAULT_ESCAPE_CHARACTER, "\r\n");

这将允许为每一行创建一个新行。为确保此方法有效，请使用＆＃34; \ r \ n＆＃34; ，而不仅仅是＆＃34; \ n＆＃34; ，因为有些编辑不会这样做; t识别＆＃34; \ n＆＃34; 。

在Android中如何使用Cursor将新行附加到.CSV文件

1 个答案: