Question

我在编写一个示例程序时遇到了一些麻烦。

这是我的代码：

public void prePopulateDatabase(SQLiteDatabase db, Context helperContext){
    String fileIn = "";
    String[] file;
    ContentValues row = new ContentValues();
    AssetManager am;
    InputStream is = null;
    am = helperContext.getResources().getAssets();

    try {
        is = am.open("Matrix.csv");
        BufferedReader br = new BufferedReader(new InputStreamReader(is));
        while((fileIn = br.readLine()) != null){
            file = fileIn.split(",");
            row.put(KEYWORD, file[0]);
            row.put(DURATION, file[1]);
            row.put(AMOUNT, file[2]);
            row.put(DESCRIPTION, file[3]);
            row.put(LEVEL_NAME, file[4]);
            row.put(CHOICE_FOR_TWO_1, file[5]);
            row.put(CHOICE_FOR_TWO_2, file[6]);
            row.put(CHOICE_FOR_FIVE_1, file[7]);
            row.put(CHOICE_FOR_FIVE_2, file[8]);
            row.put(CHOICE_FOR_FIVE_3, file[9]);
            row.put(CHOICE_FOR_FIVE_4, file[10]);
            row.put(CHOICE_FOR_FIVE_5, file[11]);
            insertToDBViaContentValues(db, row);
        }//end while
    } catch (Exception e) {
            e.printStackTrace();
    }//end try catch
}//end fxn

public void insertToDBViaContentValues(SQLiteDatabase db, ContentValues row){
    procedure("SiteMatrixMultiLevels: INSERT TO DB > "+row.toString());
        db.insert(TABLE_SITES, null, row);
}

public void validate(SQLiteDatabase db){
    Cursor c = db.rawQuery("select * from "+TABLE_SITES, null);
    if(c != null && c.moveToFirst()){
        while(!c.isAfterLast()){
            data("VALUE: " + c.getString(0) + "," + c.getString(1) + "," + c.getString(2) + "," + c.getString(3) + "," + c.getString(4) + "," + c.getString(5)
                    + "," + c.getString(6) + "," + c.getString(7) + "," + c.getString(8) + "," + c.getString(9) + "," + c.getString(10)
                     + "," + c.getString(11) + "," + c.getString(12));
            c.moveToNext();
        }
    }
}

我收到错误

02-03 20:24:04.537: W/System.err(16437): java.lang.ArrayIndexOutOfBoundsException: length=7; index=7

在

row.put(CHOICE_FOR_FIVE_1, file[7]);

我从中获取文件的csv文件有多行，但只有2种格式。前100个是这种格式

pkey,keyword,duration,amount,description,A,B,,,,,

而另外100人遵循这种格式

pkey,keyword,duration,amount,description,,,C,D,E,F,G

我不确定我是否收到错误，因为第一种格式类型仅在7处停止（因为没有指定C，D，E，F，G的值。）

任何帮助将不胜感激。谢谢！

Answer 1

您的数据没有问题。以下是split()电话中的所需内容......

file = fileIn.split(",", -1);

多数人......

实际上，您需要查阅split(String regex)的文档，正如它所说的那样，

此方法的工作方式就像通过调用双参数split方法一样给定的表达式和一个零的限制参数。尾随空因此，字符串不包含在结果数组中。

表示您需要在其中定义第二个参数（limit），否则它会将其视为zero '0'，并且将删除空条目。所以传递-1以获取所有空条目。

希望这会有所帮助......

Answer 2

简单的实施。尝试使用StringTokenizer。

private void readAndInsert() throws UnsupportedEncodingException {


ArrayList<SimpleQuestion> questions = new ArrayList<SimpleQuestion>();
AssetManager assetManager = getAssets();
InputStream is = null;

            try {
                is = assetManager.open("questions/question_bank.csv");
            } catch (IOException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }

            BufferedReader reader = null;
            reader = new BufferedReader(new InputStreamReader(is, Charset.forName("UTF-8")));

            String line = "";
            StringTokenizer st = null;
            try {

                while ((line = reader.readLine()) != null) {
                    st = new StringTokenizer(line, ",");
                    SimpleQuestion sQuestion= new SimpleQuestion ();
                                    //your attributes
                    sQuestion.setX(st.nextToken());
                    sQuestion.setY(st.nextToken());
                    sQuestion.setZ(st.nextToken());
                    sQuestion.setW(st.nextToken());
                    questions .add(sQuestion);

                }
            } catch (IOException e) {

                e.printStackTrace();
            }

            yourDB.bulkInsert(questions );

}

Android从.csv插入到sqlite数据库

2 个答案: