Android 异常:光标索引超出范围
以下是活动中的代码:Android 异常:光标索引超出范围,android,database,eclipse,Android,Database,Eclipse,以下是活动中的代码: //query final dbhelper helper = new dbhelper(this); Cursor c = helper.query(); boolean exist =false; if(c != null && c.moveToFirst()){ Log.d("atestdbChar1no",String.valueOf(c.getCount())); int i=0; while(c.isAfterLast()){ Log.d(
//query
final dbhelper helper = new dbhelper(this);
Cursor c = helper.query();
boolean exist =false;
if(c != null && c.moveToFirst()){
Log.d("atestdbChar1no",String.valueOf(c.getCount()));
int i=0;
while(c.isAfterLast()){
Log.d("atestdb1",String.valueOf(i++));
Log.d("atestdb2",String.valueOf(c.getInt(0)));
Log.d("atestdb3",c.getString(1));
Log.d("atestdb4",c.getString(2));
c.moveToNext();
}
//insert
ContentValues values = new ContentValues();
if(!finWords.equals("null")){
if(finWords.length()>index){
String selectWord = finWords.substring(index, index+1);
values.put("character", finChar);
values.put("word", selectWord);
helper.insert(values);
以下是SQLiteOpenHelper中的代码:
public void insert(ContentValues values) {
SQLiteDatabase db = getWritableDatabase();
db.insert(TBL_NAME, null, values);
Log.d("test", "dbinsert");
db.close();
}
public Cursor query() {
SQLiteDatabase db = getWritableDatabase();
Cursor c = db.query(TBL_NAME, null, null, null, null, null, null);
Log.d("test", "dbquery");
return c;
}
我可以把数据插入数据库
但我不能质疑他们
logcat显示光标索引超出范围
然后只输出一些数据,例如只输出id为1,2,4,7的数据,然后强制关闭应用程序
但我已经插入了14个数据
我的代码怎么了?您忘了对c.isAfterlast()求反,除非您将null传递回,否则您不必检查null游标
if(c.moveToFirst()){
Log.d("atestdbChar1no",String.valueOf(c.getCount()));
int i=0;
while(!c.isAfterLast()){
Log.d("atestdb1",String.valueOf(i++));
Log.d("atestdb2",String.valueOf(c.getInt(0)));
Log.d("atestdb3",c.getString(1));
Log.d("atestdb4",c.getString(2));
c.moveToNext();
}
日志跟踪后,当您说有异常时,您是否在游标中获取数据?使用函数检查c.moveToFirst()是否有要返回的记录。。