得到CursorIndexOutOfBoundsException的原因

我把全部代码都贴上，cursor好像不对。

    package com.tanukiproductions.battleforchristmas;

    import android.content.ContentValues;
    import android.content.Context;
    import android.database.Cursor;
    import android.database.SQLException;
    import android.database.sqlite.SQLiteDatabase;
    import android.database.sqlite.SQLiteOpenHelper;

    public class SQLiteTable {

    public static final String KEY_ROWID = "_id";
    public static final String KEY_LEVEL = "level";
    public static final String KEY_HEALTH = "health";
    public static final String KEY_NAME = "name";
    public static final String KEY_CRIT = "crit";
    public static final String KEY_CRIT_RANGE = "crit_range";
    public static final String KEY_CRIT_INC = "crit_increment";
    public static final String KEY_HIT_RANGE = "hit_range";
    public static final String KEY_HIT_INC = "hit_increment";
    public static final String KEY_CHAR_IMG = "character_image";
    public static final String KEY_TOTAL_XP = "total_xp";
    public static final String KEY_XP = "xp";
    public static final String KEY_XP_NEEDED = "xp_needed";
    public static final String KEY_COINS = "coins";
    public static final String KEY_SMALL_POTS = "small_pots";
    public static final String KEY_LARGE_POTS = "large_pots";

    private static DbHelper ourHelper;
    private final Context ourContext;
    private static SQLiteDatabase ourDatabase;

    private static final String DB_NAME = "battle_for_christams";
    private static final String DB_TBL = "stats";
    private static final int DATABASE_VERSION = 1;

    private static class DbHelper extends SQLiteOpenHelper{

        public DbHelper(Context context) {
            super(context, DB_NAME, null, DATABASE_VERSION);
            // TODO Auto-generated constructor stub
        }
        @Override
        public void onCreate(SQLiteDatabase db) {
            // TODO Auto-generated method stub
            db.execSQL("CREATE TABLE " + DB_TBL + " (" +
                    KEY_ROWID + " INTEGER PRIMARY KEY AUTOINCREMENT, " + 
                    KEY_LEVEL + " INTEGER NOT NULL, " + 
                    KEY_HEALTH + " INTEGER NOT NULL, " +
                    KEY_NAME + " TEXT NOT NULL, " +
                    KEY_CRIT + " INTEGER NOT NULL, " +
                    KEY_CRIT_RANGE + " INTEGER NOT NULL, " +
                    KEY_CRIT_INC + " INTEGER NOT NULL, " +
                    KEY_HIT_RANGE + " INTEGER NOT NULL, " +
                    KEY_HIT_INC + " INTEGER NOT NULL, " +
                    KEY_CHAR_IMG + " INTEGER NOT NULL, " +
                    KEY_TOTAL_XP + " INTEGER NOT NULL, " +
                    KEY_XP + " INTEGER NOT NULL, " +
                    KEY_XP_NEEDED + " INTEGER NOT NULL, " +
                    KEY_COINS + " INTEGER NOT NULL, " + 
                    KEY_SMALL_POTS + " INTEGER NOT NULL, " +
                    KEY_LARGE_POTS + " INTEGER NOT NULL)"
                );

            ContentValues values = new ContentValues();
            values.put(KEY_NAME, "User1");
            values.put( KEY_LEVEL, 1);
            values.put(KEY_HEALTH, 10);
            values.put(KEY_CRIT, 5);
            values.put(KEY_CRIT_RANGE, 2);
            values.put(KEY_CRIT_INC, 2);
            values.put(KEY_HIT_RANGE, 2);
            values.put(KEY_HIT_INC, 0);
            values.put(KEY_TOTAL_XP, 0);
            values.put(KEY_XP, 0);
            values.put(KEY_XP_NEEDED, 5);
            values.put(KEY_COINS, 5);
            values.put(KEY_SMALL_POTS, 0);
            values.put(KEY_LARGE_POTS, 0);
            values.put(KEY_CHAR_IMG, 1);
            db.insert(DB_TBL,  null, values);

        }

        @Override
        public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
            // TODO Auto-generated method stub
            db.execSQL("DROP TABLE IF EXIST " + DB_TBL);
            onCreate(db);
        }

    }

    public SQLiteTable(Context c){
        ourContext = c;
        ourHelper = new DbHelper(ourContext);
    }

    public static void open() throws SQLException{
        ourDatabase = ourHelper.getWritableDatabase();
    }

    public static void close() throws SQLException{
        ourHelper.close();
    }

    public int getLevel() {
        open();
        Cursor cursor = ourDatabase.query(DB_TBL, new String[] {KEY_LEVEL}, null, null, null, null, null);
        int level = cursor.getInt(0);
        cursor.close();
        close();
        return level;
    }

    public int getHealth() {
        open();
        Cursor cursor = ourDatabase.query(DB_TBL, new String[] {KEY_HEALTH}, null, null, null, null, null);
        int health = cursor.getInt(0);
        cursor.close();
        close();
        return health;
    }

    public int getCrit() {
        // TODO Auto-generated method stub
        open();
        Cursor cursor = ourDatabase.query(DB_TBL, new String[] {KEY_CRIT}, null, null, null, null, null);
        int crit = cursor.getInt(0);
        cursor.close();
        close();
        return crit;
    }

    public int getCritRange() {
        // TODO Auto-generated method stub
        open();
        Cursor cursor = ourDatabase.query(DB_TBL, new String[] {KEY_CRIT_RANGE}, null, null, null, null, null);
        int critRange = cursor.getInt(0);
        cursor.close();
        close();
        return critRange;
    }

    public int getCritInc() {
        // TODO Auto-generated method stub
        open();
        Cursor cursor = ourDatabase.query(DB_TBL, new String[] {KEY_CRIT_INC}, null, null, null, null, null);
        int critInc = cursor.getInt(0);
        cursor.close();
        close();
        return critInc;
    }

    public int getHitInc() {
        // TODO Auto-generated method stub
        open();
        Cursor cursor = ourDatabase.query(DB_TBL, new String[] {KEY_HIT_INC}, null, null, null, null, null);
        int hitInc = cursor.getInt(0);
        cursor.close();
        close();
        return hitInc;
    }

    public int getHitRange() {
        // TODO Auto-generated method stub
        open();
        Cursor cursor = ourDatabase.query(DB_TBL, new String[] {KEY_HIT_RANGE}, null, null, null, null, null);
        int hitRange = cursor.getInt(0);
        cursor.close();
        close();
        return hitRange;
    }

    public int getXp() {
        open();
        Cursor cursor = ourDatabase.query(DB_TBL, new String[] {KEY_XP}, null, null, null, null, null);
        int xp = cursor.getInt(0);
        cursor.close();
        close();
        return xp;
    }

    public void setXp(int xp){
        open();
        ContentValues values = new ContentValues();
        int xpNeeded = getXpNeeded();
        int XP = getXp() + xp;
        int totalXp = getTotalXp() + xp;
        if ( XP >= xpNeeded ){
            XP = XP - xpNeeded;
            levelUp();
        }
        values.put(KEY_XP, XP);
        values.put(KEY_TOTAL_XP, totalXp);
        ourDatabase.update(DB_TBL, values, null, null);
        close();

    }

    public int getXpNeeded() {
        open();
        Cursor cursor = ourDatabase.query(DB_TBL, new String[] {KEY_XP_NEEDED}, null, null, null, null, null);
        int xpNeeded = cursor.getInt(0);
        cursor.close();
        close();
        return xpNeeded;
    }

    public int getTotalXp() {
        open();
        Cursor cursor = ourDatabase.query(DB_TBL, new String[] {KEY_TOTAL_XP}, null, null, null, null, null);
        int totalXp = cursor.getInt(0);
        cursor.close();
        close();
        return totalXp;
    }

    public int getCoins() {
        open();
        Cursor cursor = ourDatabase.query(DB_TBL, new String[] {KEY_COINS}, null, null, null, null, null);
        int coins = cursor.getInt(0);
        cursor.close();
        close();
        return coins;
    }

    public String getName() {
        // TODO Auto-generated method stub
        open();
        Cursor cursor = ourDatabase.query(DB_TBL, new String[] {KEY_NAME}, null, null, null, null, null);
        String name = cursor.getString(0);
        cursor.close();
        close();
        return name;
    }

    public void levelUp() {
        // TODO Auto-generated method stub
        ContentValues values = new ContentValues();
        int level = getLevel() + 1;
        int health = getHealth() + 5;
        double crit = getCrit() + 0.1;
        int xpNeeded = getXpNeeded() + 5;
        int critInc = getCritInc() + 1;
        int hitInc;
        int hitRange;
        int critRange;
        values.put(KEY_LEVEL, level);
        values.put(KEY_HEALTH, health);
        values.put(KEY_CRIT, crit);
        values.put(KEY_XP_NEEDED, xpNeeded);
        values.put(KEY_CRIT_INC, critInc);
        if(level % 2 == 0){
            hitInc = getHitInc() + 1;
            values.put(KEY_HIT_INC, hitInc);
        }
        if(level % 4 == 0){
            hitRange = getHitRange() + 1;
            critRange = getCritRange() + 1;
            values.put(KEY_HIT_RANGE, hitRange);
            values.put(KEY_CRIT_RANGE, critRange);
        }
        ourDatabase.update(DB_TBL, values, null, null );
    }

    private int getLargePots() {
        // TODO Auto-generated method stub
        open();
        Cursor cursor = ourDatabase.query(DB_TBL, new String[] {KEY_LARGE_POTS}, null, null, null, null, null);
        int largePots = cursor.getInt(0);
        cursor.close();
        close();
        return largePots;
    }

    private int getSmallPots() {
        // TODO Auto-generated method stub
        open();
        Cursor cursor = ourDatabase.query(DB_TBL, new String[] {KEY_SMALL_POTS}, null, null, null, null, null);
        int smallPots = cursor.getInt(0);
        cursor.close();
        close();
        return smallPots;
    }

    public void updateSmallPots() {
        // TODO Auto-generated method stub
        ContentValues values = new ContentValues();
        open();
        int smallPots = getSmallPots() + 1;
        int coins = getCoins() - 1; 
        values.put(KEY_SMALL_POTS, smallPots);
        values.put(KEY_COINS, coins);
        ourDatabase.update(DB_TBL, values, null, null);
        close();
    }

    public void updateLargePots(){
        ContentValues values = new ContentValues();
        open();
        int largePots = getLargePots() + 1;
        int coins = getCoins() - 2;
        values.put(KEY_LARGE_POTS, largePots);
        values.put(KEY_COINS, coins);
        ourDatabase.update(DB_TBL, values, null, null);
        close();
    }
    }

然后运行获得错误：

    01-04 16:12:25.596: E/AndroidRuntime(29517): android.database.CursorIndexOutOfBoundsException: Index -1 requested, with a size of 1
    01-04 16:12:25.596: E/AndroidRuntime(29517):    at android.database.AbstractCursor.checkPosition(AbstractCursor.java:580)
    01-04 16:12:25.596: E/AndroidRuntime(29517):    at android.database.AbstractWindowedCursor.checkPosition(AbstractWindowedCursor.java:214)