I have to retreive a string from database using their id.I done thet retreival,But it is returning as some object format not as a string.Please help me..
My retreival place:
db.open();
for(int i=1;i<=5;i++)
{
if(i==1)
group1=db.getspintitle(1);
if(i==2)
group1=db.getspintitle(2);
if(i==3)
group1=db.getspintitle(3);
if(i==4)
group1=db.getspintitle(4);
if(i==5)
group1=db.getspintitle(5);
}
db.getspintitle() method:
public String getspintitle(int rowId)throws SQLException
{
String sumtotal="";
Cursor cursor1 = db.rawQuery(
"SELECT spin from spinner WHERE _id='rowId'", null);
sumtotal=cursor1.toString();
cursor1.close();
return sumtotal;
}
For your information, The below returns you the Cursor, not the simple String.
Cursor cursor1 = db.rawQuery("SELECT spin from spinner WHERE _id='rowId'", null);
To retrieve value from the cursor, you have to iterate through the cursor.
Now, here in your case, you can do as below:
Cursor cursor1 = db.rawQuery("SELECT spin from spinner WHERE _id='rowId'", null);
if (cursor != null && cursor.getCount() > 0) {
cursor.moveToNext();
sumtotal= cursor.getString(0);
cursor.close();
}
String[] sumTotal= new String[cursor.getCount()]
while(cursor.moveToNext())
sumtotal[i] = cursor.getString(0);
Related
I use a string to populate a textview on an listview
String[] text1 = { "Afghanistan", "Algeria" ,"Fred"};
I want to replace the 3 strings in the string array with data from a database. I have tried the following
String text1[];
DBAdapter db = new DBAdapter(this);
db.open();
Cursor c = db.getAsset3();
int counter = 0;
while (c.moveToNext()) {
text1[counter]=c.getString(0);
counter++;
}
getAsset3 from DBAdapter
public Cursor getAsset3() throws SQLException
{
Cursor mCursor =
db.query(true, "SURVDAT", new String[] {KEY_SR1,KEY_SR2,KEY_SR3,KEY_SR4,KEY_SR5,KEY_SR6,KEY_SR7}, null, null,null, null, null, null);
if (mCursor != null) {
//mCursor.moveToFirst();
}
return mCursor;
}
When I run the app crashes saying Null PointerException
Any ideas where I'm going wrong?
Any help Appreciated
Mark
You didn't initialize text1 in your second snippet, so when you type text1[counter] = c.getString(0); you are trying to get counter'th index of null
You shall do something like
DBAdapter db = new DBAdapter(this);
db.open();
Cursor c = db.getAsset3();
String text1[] = new String[c.getCount()];
for(int i = 0; cursor.moveToNext(); ++i)
{
text1[i] = c.getString(0);
}
cursor.close();
Please help me with following, I have a database which contain strings ( e.g. fotonames ).
And I want to read entire fotonames column into an arraylist.
How can I do this?
public Cursor getfotoname() throws SQLException
{
String getRT = "SELECT fotonames from "+ TABLE_NAME+";";
Cursor mCur = sqldb.rawQuery(getRT, null);
return mCur;
}
Now when you call
Cursor mCursor=null;
mCursor= DatabaseObject.getfotoname();
ArrayList<WhateverTypeYouWant> mArrayList = new ArrayList<WhateverTypeYouWant>();
for(mCursor.moveToFirst(); mCursor.moveToNext(); mCursor.isAfterLast()) {
// The Cursor is now set to the right position
mArrayList.add(mCursor.getWhateverTypeYouWant(WHATEVER_COLUMN_INDEX_YOU_WANT));
}
Have a look at this tutorial will help you
http://www.anotherandroidblog.com/2010/08/04/android-database-tutorial/
this is where you can lear how to fetch all values from one column
http://www.anotherandroidblog.com/2010/08/04/android-database-tutorial/3/#getrowasarray
or otherway is
fire query like this
public Cursor columnValues() throws SQLException{
// TODO Auto-generated method stub
Cursor mCursor = db.query(Course_Info_Table,
new String[] {Column1 , column2 },
null,null, null, null, null);
//Cursor mCursor = mDb.rawQuery("Select",null);
if (mCursor != null)
{
mCursor.moveToFirst();
}
return mCursor;
}
and receive it like
ArrayList<String> list1 = new ArrayList<String>();
ArrayList<String> list12 = new ArrayList<String>();
cursor = dbm.columnValueofCourse();
cursor.moveToFirst();
startManagingCursor(cursor);
for (int i = 0; i < cursor.getCount(); i++) {
String reciv = cursor.getString(cursor
.getColumnIndex("column1"));
String reciv3 = cursor.getString(cursor
.getColumnIndex("column2"));
list1.add(reciv);
list2.add(reciv3);
cursor.moveToNext();
}
i want to get the value from the cursor without the SimpleCursorAdapter part.here is the code
public Cursor queueAll(){
String[] columns = new String[]{KEY_ID, KEY_CONTENT1, KEY_CONTENT2,KEY_CONTENT3};
Cursor cursor = sqLiteDatabase.query(MYDATABASE_TABLE, columns,
null, null, null, null, null);
return cursor;
}
and the activity side code
cursor = mySQLiteAdapter.queueAll();
from = new String[]{SQLiteAdapter.KEY_ID, SQLiteAdapter.KEY_CONTENT1, SQLiteAdapter.KEY_CONTENT2, SQLiteAdapter.KEY_CONTENT3};
int[] to = new int[]{R.id.id, R.id.text1, R.id.text2,R.id.text3};
cursorAdapter =
new SimpleCursorAdapter(this, R.layout.row, cursor, from, to);
listContent.setAdapter(cursorAdapter);
while(!cursor.isAfterLast())
{
String tilt = cursor.getString(cursor.getColumnIndex(SQLiteAdapter.KEY_CONTENT1));
String pkg = cursor.getString(cursor.getColumnIndex(SQLiteAdapter.KEY_CONTENT3));
if(tilt.equals("LEFT"))
{
Log.v("LEFT",pkg);
}
else if(tilt.equals("RIGHT"))
{
Log.v("RIGHT",pkg);
}
cursor.moveToNext();
}
i am getting the pkg value correct.but i want to get the values directly from the cursor while removing SimpleCursorAdapter part the code doesn't work.
any help would be appreciated :)
You can get values without declaring adapters. Adapters are need if you want to show the data in the list widgets. So your can be the following:
cursor = mySQLiteAdapter.queueAll();
if (cursor == null) {
//check if there are errors or query just return null
}
if (cursor.moveToFirst()) {
while(!cursor.isAfterLast())
{
String tilt = cursor.getString(cursor.getColumnIndex(SQLiteAdapter.KEY_CONTENT1));
String pkg = cursor.getString(cursor.getColumnIndex(SQLiteAdapter.KEY_CONTENT3));
if(tilt.equals("LEFT"))
{
Log.v("LEFT",pkg);
}
else if(tilt.equals("RIGHT"))
{
Log.v("RIGHT",pkg);
}
cursor.moveToNext();
}
}
First you must count how many rows are in your table. Then assign that count to variable and it use to create an array. For array size you can use that count variable. Then create a for loop and use that count variable for rounds. After create your query and assign values to your arrays. 100% worked!.
int sqlcount;
Cursor mFetch;
SQLiteDatabase mydb = openOrCreateDatabase("your database name", MODE_PRIVATE, null);
mydb.execSQL("create table if not exists customer(name varchar,email varchar)");
Cursor mCount = mydb.rawQuery("select count(*) from customer", null);
mCount.moveToFirst();
sqlcount = mCount.getInt(0);
mCount.close();
String cname[] = new String[sqlcount];
String cemail[] = new String[sqlcount];
for(int i=0;i<sqlcount;i++) {
mFetch= mydb.rawQuery("select name,email from customer", null);
mFetch.moveToPosition(i);
cname[i] = mFetch.getString(0);
cemail[i] = mFetch.getString(1);
}
mFetch.close();
Toast.makeText(MainActivity.this,String.valueOf(cname[0]),Toast.LENGTH_SHORT).show();
Toast.makeText(MainActivity.this,String.valueOf(cemail[1]),Toast.LENGTH_SHORT).show();
what i want to do is do a search of my database for a string then find out what the row id is where that string is.
I thought by doing this
public void getRow(){
ContactDB db = new ContactDB(this);
db.open();
Cursor c = db.getId("1234567890");
String test = c.getString(c.getColumnIndex(db.PHONE_NUMBER));
Log.v("Contact", "Row ID: " + test);
db.close();
database class
public Cursor getId(String where){
return db.query(DATABASE_TABLE, new String[] {ID},where,null,null,null,null);
}
that it would give me what i want but i get a "cursor index out of bounds" error, how should i be doing this?
change getId to:
public Cursor getId(String where){
Cursor c = db.query(DATABASE_TABLE, new String[] {ID},where,null,null,null,null);
if (c != null) c.moveToFirst();
return c;
}
You need to do c.moveToFirst() before tying to read any information.
Also do c.close() when you're done.
I am getting cursor index out of bounds "index 0 requested: with size 0" error when I search my database for something. The item I am searching for in my database does not exist currently and i am aware of that but how do i handle a query where the item does not exist.
i send in a phone number
public String searchNumber(Context context,String number){
ContactDB db = new ContactDB(context);
db.open();
Cursor curs = db.getIdFromPhone(number);
String test = curs.getString(curs.getColumnIndex(db.PHONE_NUMBER)); //fails here
curs.close();
db.close();
return test;
}
query
public Cursor getIdFromPhone(String where){
Cursor cur = db.query(DATABASE_TABLE, new String [] {ID,PHONE_NUMBER}
, PHONE_NUMBER + "='" + where + "'",null,null,null,null);
if(cur != null)
cur.moveToFirst();
return cur;
}
test search
from = messages.getDisplayOriginatingAddress();
String dbNumber = searchNumber(arg0,from);
if(dbNumber.equals(from)){
//do stuff
}else{
//do other stuff
}
if number is not found it should do the else statement but it does not get that far
Cursor.moveToFirst() returns false if the Cursor is empty. The returned Cursor from the query() call will never be null but it might be empty. You are never checking if the cursor is empty.
public String searchNumber(Context context,String number){
ContactDB db = new ContactDB(context);
db.open();
Cursor curs = db.query(DATABASE_TABLE, new String [] {ID,PHONE_NUMBER}
, PHONE_NUMBER + "='" + number + "'",null,null,null,null);
String test = null;
if(curs.moveToFirst()) { //edit
test = curs.getString(curs.getColumnIndex(db.PHONE_NUMBER)); //fails here
}
curs.close();
db.close();
return test; // this will be null if the cursor is empty
}
And get rid of the getIdFromPhone() method.
While you retrive value you have to use cursor.moveToNext;
if (cursor.moveToFirst()){
do{
String data = cursor.getString(cursor.getColumnIndex("data"));
// do what ever you want here
}while(cursor.moveToNext());
}