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我想從我的數據庫中獲取一些數據。 這是我爲它的代碼：Android SQLite奇怪的錯誤？
}else if(menuItemName=="Toggle Reset Protection"){
int is = updateData.getSingleProtect(listItemName, listTotal);
int val = 0;
if(is==0)
{
val = 1;
}
else
if(is==1)
{
val = 0;
}
updateData.protect(listItemName, listTotal, val);
onResume();
}
這是一個上下文菜單裏面，是了updateData指我的SQLite的類的對象。 由於某種原因，只有這else if()代碼塊搞亂了我的項目。
當它的存在，錯誤控制檯告訴我，我不能做updateData.open()正因爲如此：
close() was never explicitly called on database......
但是，當我刪除我的代碼else if塊我沒有得到這個錯誤。這裏有什麼問題？
這裏是我完整的上下文菜單代碼：
public boolean onContextItemSelected(MenuItem item) {
AdapterView.AdapterContextMenuInfo info =(AdapterView.AdapterContextMenuInfo)item.getMenuInfo();
int menuItemIndex = item.getItemId();
String[] menuItems = new String[]{"Delete", "Edit", "Toggle Reset Protection", "Add"};
String menuItemName = menuItems[menuItemIndex];
final String listItemName = name[info.position];
final int listCurrent = current[info.position];
final int CurrentTarget = listCurrent+1;
final int listTotal = total[info.position];
SetSql updateData = new SetSql(SpellCast.this);
updateData.open();
if(menuItemName=="Delete"){
updateData.delete(listItemName, listTotal);
onResume();
}else if(menuItemName=="Add"){
if(listCurrent<listTotal){
updateData.changeCurrent(CurrentTarget, listCurrent, listItemName);
onResume();
}
}else if(menuItemName=="Edit"){
AlertDialog.Builder alert = new AlertDialog.Builder(this);
alert.setTitle(listItemName);
alert.setMessage("Enter new maximum value:");
final EditText input = new EditText(this);
alert.setView(input);
input.setText(Integer.toString(listTotal));
input.setFilters(new InputFilter[] {
// Maximum 2 characters.
new InputFilter.LengthFilter(3),
// Digits only.
DigitsKeyListener.getInstance(), // Not strictly needed, IMHO.
});
// Digits only & use numeric soft-keyboard.
input.setKeyListener(DigitsKeyListener.getInstance());
alert.setPositiveButton("Change",
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int whichButton) {
String totalString = input.getText().toString();
int totalv = Integer.parseInt(totalString);
changeTotal(totalv, listTotal, listItemName);
changeCurrent(totalv, listCurrent, listItemName);
onResume();
}
});
alert.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int whichButton) {
// do nothing
}
});
alert.show();
}else if(menuItemName=="Toggle Reset Protection"){
int is = updateData.getSingleProtect(listItemName, listTotal);
int val = 0;
if(is==0){
val = 1;
}else if(is==1){
val = 0;
}
updateData.protect(listItemName, listTotal, val);
onResume();
}
updateData.close();
return true;
}
，這裏是我的SQL類：
private static class DbHelper extends SQLiteOpenHelper{
public DbHelper(Context context) {
super(context, DATABASE_NAME, null, DATABASE_VERSION);
// TODO Auto-generated constructor stub
}
@Override
public void onCreate(SQLiteDatabase db) {
// TODO Auto-generated method stub
db.execSQL("CREATE TABLE " + DATABASE_CASTING + " (" +
KEY_ROWID + " INTEGER PRIMARY KEY AUTOINCREMENT, " +
KEY_NAME + " VARCHAR NOT NULL, " +
KEY_TOTAL + " INTEGER NOT NULL, " +
KEY_CURRENT + " INTEGER NOT NULL, " +
KEY_PROTECT + " INTEGER NOT NULL);"
);
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
// TODO Auto-generated method stub
db.execSQL("DROP TABLE IF EXISTS " + DATABASE_CASTING);
onCreate(db);
}
}
public SetSql(Context c){
ourContext = c;
}
public SetSql open(){
ourHelper = new DbHelper(ourContext);
ourDatabase = ourHelper.getWritableDatabase();
return this;
}
public void close(){
ourHelper.close();
}
public void createEntry(String name, int total, int protect) {
// TODO Auto-generated method stub
ContentValues cv = new ContentValues();
cv.put(KEY_NAME, name);
cv.put(KEY_TOTAL, total);
cv.put(KEY_CURRENT, total);
cv.put(KEY_PROTECT, protect);
ourDatabase.insert(DATABASE_CASTING, null, cv);
}
public void changeCurrent(int value, int cval, String name){
ourDatabase.execSQL("UPDATE " + DATABASE_CASTING + " SET " + KEY_CURRENT + " = '" + value + "' WHERE " + KEY_NAME + " = '" + name + "' AND " + KEY_CURRENT + " = '" + cval + "'");
}
public void changeTotal(int newtotal, int oldtotal, String name){
ourDatabase.execSQL("UPDATE " + DATABASE_CASTING + " SET " + KEY_TOTAL + " = '" + newtotal + "' WHERE " + KEY_NAME + " = '" + name + "' AND " + KEY_TOTAL + " = '" + oldtotal + "'");
}
public String[] getNames() throws SQLException{
String[] columns = new String[]{KEY_NAME};
Cursor c = ourDatabase.query(DATABASE_CASTING, columns, null, null, null, null, KEY_ROWID);
String[] result = new String[100];
int iName = c.getColumnIndex(KEY_NAME);
//might cause errors here below...
int count = 0;
for(c.moveToFirst(); !c.isAfterLast(); c.moveToNext()){
result[count] = c.getString(iName);
count++;
}
count = 0;
return result;
}
public int[] getTotal(){
int[] totals = new int[100];
String[] columns = new String[]{KEY_TOTAL};
Cursor c = ourDatabase.query(DATABASE_CASTING, columns, null, null, null, null, KEY_ROWID);
int iTotal = c.getColumnIndex(KEY_TOTAL);
int count = 0;
for(c.moveToFirst(); !c.isAfterLast(); c.moveToNext()){
totals[count] = c.getInt(iTotal);
count++;
}
count = 0;
return totals;
}
public int[] getCurrent(){
int[] currents = new int[100];
String[] columns = new String[]{KEY_CURRENT};
Cursor c = ourDatabase.query(DATABASE_CASTING, columns, null, null, null, null, KEY_ROWID);
int iCurrent = c.getColumnIndex(KEY_CURRENT);
int count = 0;
for(c.moveToFirst(); !c.isAfterLast(); c.moveToNext()){
currents[count] = c.getInt(iCurrent);
count++;
}
count = 0;
return currents;
}
public int enteries(){
int num = 0;
String[] columns = new String[]{KEY_ROWID};
Cursor c = ourDatabase.query(DATABASE_CASTING, columns, null, null, null, null, null);
for(c.moveToFirst(); !c.isAfterLast(); c.moveToNext()){
num++;
}
return num;
}
public void delete(String name, int total) {
// TODO Auto-generated method stub
ourDatabase.execSQL("DELETE FROM " + DATABASE_CASTING + " WHERE " + KEY_NAME + " = '" + name + "' AND " + KEY_TOTAL + " = '" + total + "'");
}
public int[] getProtect(){
int[] protect = new int[100];
String q = "SELECT " + KEY_PROTECT + " FROM " + DATABASE_CASTING + " ORDER BY " + KEY_ROWID + ";";
Cursor mCursor = ourDatabase.rawQuery(q, null);
int iProt = mCursor.getColumnIndex(KEY_PROTECT);
int count = 0;
for(mCursor.moveToFirst(); !mCursor.isAfterLast(); mCursor.moveToNext()){
protect[count] = Integer.parseInt(mCursor.getString(iProt));
count++;
}
count = 0;
return protect;
}
public void protect(String name, int total, int value){
ourDatabase.execSQL("UPDATE " + DATABASE_CASTING + " SET " + KEY_PROTECT + " = '" + value + "' WHERE " + KEY_NAME + " = '" + name + "' AND " + KEY_TOTAL + " = '" + total + "';");
}
public int getSingleProtect(String name, int total){
String q = "SELECT * FROM " + DATABASE_CASTING + " WHERE " + KEY_NAME + " = '" + name +"' AND " + KEY_TOTAL + " = '" + total + "';";
Cursor mCursor = ourDatabase.rawQuery(q, null);
int index = mCursor.getColumnIndex(KEY_PROTECT);
int prot = mCursor.getInt(index);
return prot;
}
}
什麼是updateData.open（）？你談論的通常是當db.close（）沒有被調用，其中db是SQLiteDatabase。 –
updateData.open（）;是一個打開數據庫和dbHelper的函數。 updateData.close（）;關閉它們。 – arielschon12
你能告訴我們哪個'else if'是什麼意思？ （有兩個...）你也可以告訴我們什麼'updateData.protect（）'，'getSingleProtect（）'和'onResume（）'並且在哪個上下文中調用它？基本上確保在所有'if'情況下，在完成後顯式關閉數據庫...... – WarrenFaith