我尝试将数据从csv文件添加到Android上的sqlite数据库。
我在csv文件中的数据如下所示
SID,Attended,Serial,Time,Title,Forenames,Last name,Parking,How many people will be in your party (including yourself)?,Any access requirements?,Access requirements,Timetable
9290,,0000000092906,2014-04-07 18:44:59,Miss,foo1,foo1,,2,No,,fooo
9291,,0000000092907,2014-04-08 18:44:59,Miss,foo2,foo2,,2,No,,fooo
9292,,0000000092908,2014-04-07 18:44:59,Miss,foo3,foo3,,2,No,,fooo
我创建了一个DatabaseHelper来导入它：
public void importFromCSV(String filename)
{
//deleteTable();
SQLiteDatabase db = this.getReadableDatabase();
String next[] = {};
try {
db.beginTransaction();
CSVReader reader = new CSVReader(new FileReader(filename));
reader.readNext();
for(;;) {
next = reader.readNext();
if(next != null) {
this.addPerson(new Person(Long.parseLong(next[0]),
next[1],
Long.parseLong(next[2]),
next[3],
next[4],
next[5],
next[6],
next[7],
Integer.parseInt(next[8]),
next[9],
next[10],
next[11]));
} else {
break;
}
}
reader.close();
} catch (IOException e) {
e.printStackTrace();
}
finally {
db.endTransaction();
}
}
但是当我尝试在我的数据库上执行SELECT时，我收到一个错误：CursorIndexOutOfBoundsException：请求索引0，大小为0。 我做了一些研究，发现这个错误是因为光标空了。
这是我的getPerson函数：
public Person getPerson(long sid){
// 1. get reference to readable DB
SQLiteDatabase db = this.getReadableDatabase();
// 2. build query
Cursor cursor =
db.query(TABLE_PERSONS, // a. table
COLUMNS, // b. column names
" sid = ?", // c. selections
new String[] { String.valueOf(sid) }, // d. selections args
null, // e. group by
null, // f. having
null, // g. order by
null); // h. limit
// 3. if we got results get the first one
if (cursor != null) {
cursor.moveToFirst();
}
// 4. build pers object
Person pers = new Person();
pers.setSid(Long.parseLong(cursor.getString(0)));
pers.setAttended(cursor.getString(1));
pers.setSerial(Long.parseLong(cursor.getString(2)));
pers.setTime(cursor.getString(3));
pers.setTitle(cursor.getString(4));
pers.setForename(cursor.getString(5));
pers.setLastname(cursor.getString(6));
pers.setParking(cursor.getString(7));
pers.setNumberpeople(Integer.parseInt(cursor.getString(8)));
pers.setAccessreqornot(cursor.getString(9));
pers.setAccessreq(cursor.getString(10));
pers.setTimetable(cursor.getString(11));
Log.d("getPerson()", pers.toString());
// 5. return pers
return pers;
}
我认为问题是由于我在importFromCsv（）中调用的addPerson函数。 我在addPerson函数开头的日志返回正确的东西，但我认为db.insert进展不顺利。但我对此没有任何错误。
我的addPerson功能：
public void addPerson(Person pers){
Log.d("addPerson", pers.toString());
// 1. get reference to writable DB
SQLiteDatabase db = this.getWritableDatabase();
// 2. create ContentValues to add key "column"/value
ContentValues values = new ContentValues();
values.put(SID, pers.getSid());
values.put(ATTENDED, pers.getAttended());
values.put(SERIAL, pers.getSerial());
values.put(TIME, pers.getTime());
values.put(TITLE, pers.getTitle());
values.put(FORENAME, pers.getForename());
values.put(LASTNAME, pers.getLastname());
values.put(PARKING, pers.getParking());
values.put(NUMBERPEOPLE, pers.getNumberpeople());
values.put(ACCESSREQORNOT, pers.getAccessreqornot());
values.put(ACCESSREQ, pers.getAccessreq());
values.put(TIMETABLE, pers.getTimetable());
// 3. insert
db.insert(TABLE_PERSONS, // table
null, //nullColumnHack
values); // key/value -> keys = column names/ values = column values
}
感谢您的阅读时间，如果有人有任何想法，我将非常感激。
编辑：Stacktrace：07-08 12:01:57.755: D/addPerson(10828): Person [sid=9290, attended=, serial=92906, time=2014-04-07 18:44:59, title=Miss, forename=Ladina, lastname=Clement, parking=, numberpeople=2, accessreqornot=No, accessreq=, timetable=Fine]
07-08 12:01:57.755: D/addPerson(10828): Person [sid=9291, attended=, serial=92907, time=2014-04-08 18:44:59, title=Miss, forename=Ladina2, lastname=Clement2, parking=, numberpeople=2, accessreqornot=No, accessreq=, timetable=Fine]
07-08 12:01:57.763: D/addPerson(10828): Person [sid=9292, attended=, serial=92908, time=2014-04-07 18:44:59, title=Miss, forename=Ladina3, lastname=Clement3, parking=, numberpeople=2, accessreqornot=No, accessreq=, timetable=Fine]
07-08 12:01:59.193: D/ViewRootImpl(10828): ViewRoot TouchDown(Absolute) DOWN (357 , 189)
07-08 12:01:59.247: D/getAllPersons()(10828): []
答案 0 :(得分：2)
更改此行：
if (cursor != null) {
cursor.moveToFirst();
}
到
if (!cursor.moveToFirst()) {
// do something when there are no results
}
对游标的空检查是多余的。您可以通过执行cursor.moveToFirst（）来检查光标是否为空。如果它返回false，你应该阻止在光标上执行更多命令，就像你以后做的那样，例如cursor.getString（0）。
答案 1 :(得分：1)
我的数据是这样的：
25-07-14 12:00,15,52,16,50,42,58,63,62,52
22-06-14 14:00,15,52,16,50,42,58,63,62,52
12-09-14 19:00,45,51,16,50,42,58,13,34,52
02-02-14 16:00,15,52,16,50,42,58,63,62,52
01-05-14 12:00,15,52,16,50,42,58,63,62,52
我已经读过这样的数据，你可以找到一次。在我检查的文件路径中是csv文件不是。
FilePath = data.getData().getPath();
if(FilePath.substring(FilePath.length()-4).endsWith(".csv"))
代码在这里
private void readcsvfile() {
if(FilePath.length()>4)
{
dataGridTable = new DgaDataGridTable(context);
equipmentTable = new EquipmentTable(context);
try {
BufferedReader reader = new BufferedReader(new InputStreamReader(new FileInputStream(FilePath)));
String line;
while ((line=reader.readLine())!=null)
{
info = new DgaDataGridInfo();
String[] rowData = line.split(",");
if(rowData[0].length()!=0&&rowData[1].length()!=0&&rowData[2].length()!=0&&rowData[3].length()!=0&&rowData[4].length()!=0&&rowData[5].length()!=0&&rowData[6].length()!=0&&rowData[7].length()!=0&&rowData[8].length()!=0&&rowData[9].length()!=0)
{
info.setDateadded(rowData[0]);
info.setH2(Integer.parseInt(rowData[1]));
info.setCh4(Integer.parseInt(rowData[2]));
info.setC2h2(Integer.parseInt(rowData[3]));
info.setC2h4(Integer.parseInt(rowData[4]));
info.setC2h6(Integer.parseInt(rowData[5]));
info.setCo(Integer.parseInt(rowData[6]));
info.setCo2(Integer.parseInt(rowData[7]));
info.setO2(Integer.parseInt(rowData[8]));
info.setN2(Integer.parseInt(rowData[9]));
info.setTdcg(Integer.parseInt(rowData[1])+Integer.parseInt(rowData[2])+Integer.parseInt(rowData[5])+Integer.parseInt(rowData[4])+Integer.parseInt(rowData[3])+Integer.parseInt(rowData[6]));
equipmentname = equipment_spinner.getSelectedItem().toString();
info.setEquipid(equipmentTable.getEquipmentId(equipmentname));
dataGridTable.insertRecord(info);
Toast.makeText(this, "Dga Records Succesfully Added", Toast.LENGTH_LONG).show();
loadAllDgaRecords();
}
else
{
showAlertDialog();
}
}
} catch (Exception e) {
e.printStackTrace();
}
}
else
Toast.makeText(this, "Please choose csv file", Toast.LENGTH_LONG).show();
}
由于