Develop Reference

To get count of duplicate column values

I have created a table with id and tag as column.
id is set as primary key. And in tag column, I have entered more than one value.
So now i want to get the count of how many times the tag value is repeated.
So my table is like this.
Id Tag
---------------------
1 Friend, Family
2 Family, Enemy
and my output should be like this:
friend (1)
family(2)
Enemy(1)
I have written a code but not getting the result I want.
This is MyDatabase.java code:
public Details calculateCount()
{
Details detail = null;
try
{
SQLiteDatabase db=this.getWritableDatabase();
String selectQuery=("select count(*),Tags from photodetails group by Tags" );
Cursor cursor = db.rawQuery(selectQuery, null);
if(cursor.moveToLast())
{
do
{
detail=new Details(Integer.parseInt(cursor.getString(0)),(cursor.getString(1)));
}while( cursor.moveToNext());
}
}
catch(Exception e)
{
e.printStackTrace();
}
return detail;
}
And this is MAinActivity.java code
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main_activity2);
getActionBar().setDisplayHomeAsUpEnabled(true);
MyDataBase MyDB = new MyDataBase(this);
Log.d(LOGCAT,"Entered MAinActivity2");
Details c= MyDB.calculateCount();
if(c == null)
{
Log.d(LOGCAT,"C is null");
}
else
{
Log.d(LOGCAT,c.getTag()); // Here iam only retrieving tag dont know how to get that count.
}
}
Pls help me out on this

If you want to get a count, you're going to want to create a method such as a int getCount() method that will return the int value of the count. Currently, you have Details calculateCount() which will return a Details object.

Get value from spinner and change Text View depending on that value

Ok this should be straight forward but i'm having difficulty with it. So far i've got this code.
public void onItemSelected(AdapterView<?> parent, View view, int position,
long id) {
// On selecting a spinner item
SpinnerFAQ = parent.getItemAtPosition(position).toString();
// Showing selected spinner item
Toast.makeText(parent.getContext(), "You selected: " + SpinnerFAQ,
Toast.LENGTH_LONG).show();
TextView tv = (TextView) findViewById(R.id.faq_answer);
ExerciseData question = new ExerciseData(this);
question.open();
String answer = question.getFaqAnswer();
question.close();
tv.setText(answer);
}
SpinnerFAQ is a global variable and it stores the value of the spinner as String.
public String getFaqAnswer() {
// TODO Auto-generated method stub
String[] columns = new String[] { FAQ_ROWID, FAQ_QUESTION, FAQ_ANSWER};
Cursor c = ourDatabase.query(DATABASE_TABLE2, columns, null, null, null, null, null);
String result = "";
int iRow = c.getColumnIndex(FAQ_ROWID);
int iQuestion = c.getColumnIndex(FAQ_QUESTION);
int iAnswer = c.getColumnIndex(FAQ_ANSWER);
//c.getString(iRow) + " " +
for(c.moveToFirst(); !c.isAfterLast(); c.moveToNext())
{
if(FAQ.SpinnerFAQ == c.getString(iQuestion))
{
result = result + c.getString(iAnswer) + "\n";
break;
}
}
return result;
}
This is based on code I've already used, but basically I want to check the Spinner against the Question in my Database and if they match I want to change the Text View to the answer. Right now the FAQ.SpinnerFAQ works fine, but c.getString(iQuestion) always shows up as the last value in the database. This code "result = result + c.getString(iAnswer) + "\n";" works fine without the if statement, so I don't really understand why there is a problem with "c.getString(iQuestion)". Any help would be greatly appreciated.

if(FAQ.SpinnerFAQ == c.getString(iQuestion))
Never compare Strings with == in Java, always use equals(). Please read: How do I compare strings in Java? and change every String comparison to:
if(FAQ.SpinnerFAQ.equals(c.getString(iQuestion)))

ORMLite select some columns using predicates

I have ORMLite database with some fields. I want to select titles from the table where id == id which I get from webservice. I do like that:
try {
Dao<ProcessStatus,Integer> dao = db.getStatusDao();
Log.i("status",dao.queryForAll().toString());
QueryBuilder<ProcessStatus,Integer> query = dao.queryBuilder();
Where where = query.where();
String a = null;
for(Order r:LoginActivity.orders) {
//LoginActivity.orders - array of my objects which I get from webservice
Log.i("database",query.selectRaw("select title from process_status").
where().rawComparison(ProcessStatus.STATUS_ID, "=",
r.getProcess_status().getProccessStatusId()).toString());
}
Log.i("sr",a);
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
I tried like this but I get only sets of my id, not titles. I tried like this:
Log.i("database", query.selectColumns(ProcessStatus.STATUS_TITLE).where().
eq(ProcessStatus.STATUS_ID, r.getProcess_status().getProccessStatusId())
.toString());
but I have the same result. How should I get data from database?

For selecting an specific field from the table, you could do something like this:
String result = "";
try {
GenericRawResults<String[]> rawResults = yourDAO.queryRaw("select " +
ProcessStatus.STATUS_TITLE +" from YourTable where "+
ProcessStatus.STATUS_ID + " = " +
r.getProcess_status().getProccessStatusId());
List<String[]> results = rawResults.getResults();
// This will select the first result (the first and maybe only row returned)
String[] resultArray = results.get(0);
//This will select the first field in the result which should be the ID
result = resultArray[0];
} catch (Exception e) {
e.printStackTrace();
}
Hope this helps.

It's hard to properly answer this question without seeing all of the classes of the processStatusId field and others. However I think you are doing too much raw method and may not be properly escaping your values and the like.
I would recommend that you use the IN SQL statement instead of what you are doing in the loop. Something like:
List<String> ids = new ArrayList<String>();
for(Order r : LoginActivity.orders) {
ids.add(r.getProcess_status().getProccessStatusId());
}
QueryBuilder<ProcessStatus, Integer> qb = dao.queryBuilder();
Where where = qb.where();
where.in(ProcessStatus.STATUS_ID, ids);
qb.selectColumns(ProcessStatus.STATUS_TITLE);
Now that you have built your query, either you can retrieve your ProcessStatus objects or you can get the titles themselves using dao.queryForRaw(...):
List<ProcessStatus> results = qb.query();
// or use the prepareStatementString method to get raw results
GenericRawResults<String[]> results = dao.queryRaw(qb.prepareStatementString());
// each raw result would have a String[] with 1 element for the title

Insert Array in SQLite Database in android

I want to save weekdays in database, so i thought to store it by assigning int value to each day. i.e
1 -> Selected, 0 -> Not Selected.
Monday = 0/1
Tuesday = 0/1
.
.
.
.
.
Sunday = 0/1.
But this will make 7 columns in DB. So I was thinking if anyone can help me with this if I should store it in a single array and retrieve the values for further use. I was reading some examples over internet but didn't get it in a easy way.

To insert 7 values in one column you can use comma separator like this
where Total_Score_P1 is an string array
//string array
String[] Total_Score = new String[] { p1e1,p1e2,p1e3,p1e4,p1e5,p1e6 };
// Convderting it into a single string
String result_ScoreP1 = ("" + Arrays.asList(Total_Score_P1)).
replaceAll("(^.|.$)", " ").replace(", ", " , " );
result_ScoreP1 will be
// output of this
result_ScoreP1 = "p1e1,p1e2,p1e3,p1e4,p1e5,p1e6";
insert it as a single string in database and
when retrieve it in again break in parts like
// a string array list
// query fired
public ArrayList<String> rulTable(String id) {
// TODO Auto-generated method stub
ArrayList<String> Ruleob = new ArrayList<String>();
Cursor c_rule;
try
{
c_rule = db.query(NameTable, new String[]{
columns1
},
Rule_COurseID + "=" + id ,
null, null,
null, null, null);
c_rule.moveToFirst();
// if there is data available after the cursor's pointer, add
// it to the ArrayList that will be returned by the method.
if (!c_rule.isAfterLast())
{
do
{
Ruleob.add(c_rule.getString(0));
}
while (c_rule.moveToNext());
}
// let java know that you are through with the cursor.
c_rule.close();
}
catch(Exception e)
{
}
return Ruleob;
}
//list to get elements
ArrayList<String> ListOne = new ArrayList<String>();
ArrayList<String> row ;
try{
// received values
row = db.TheTable(id);
String r1 = row .get(0);
}
catch(Exception e)
{
}
StringTokenizer st2 = new StringTokenizer(r1, "||");
while(st2.hasMoreTokens()) {
String Desc = st2.nextToken();
System.out.println(Desc+ "\t" );
ListOne.add(Desc);
//
}

You can use a binary integer 1= selected 0 =Not Selected (1111111) (0000000)
total seven days so index 0=mon, 1=tues, 2=wed, 3=thurs, 4=friday, 5=sat, 6=sunday..and so on..
here 1111111 means all day selected, 0000000 all day not selected, 0001000 only thursday is selected.

I have also discovered a way i.e. convert your so called values to a JSON Array and then store the complete JSON String to an entity/field in Database.
It helps in serving the values easily and effectivly.

Create another table with a column for each day, boolean value. Make an association to this table by integer id (use a foreign key) This is the relational way of solving the problem.

app not showing data when opend it for the second time

i am looking to make game of questions and answers.i had taken a textview and 4 radio group buttons.and i am fetching data from the external data file from the assets folder.when i installs the app into the emulater it works fine.when i reopens the app in the emulater it is just showing question not showing any text in the radio buttons.here is my code in the data base file
public String makeatext(String My_database_table,int i) {
SQLiteDatabase myDB = getDatabase();
String results = new String();
try {
String firstColumn = "questions";
// final String KEY_ROWID = "id";
// Cursor c = myDB.rawQuery("SELECT questions FROM " +
// My_database_table+ ";",null);
Cursor c = myDB.query(true, My_database_table,
new String[] { firstColumn },null, null, null, null, null,
null);
int iquestion = c.getColumnIndex(firstColumn);
if(c.moveToPosition(i)){
results = c.getString(iquestion)+"\n";
}
//while (c.moveToPosition(1)) {
//String firstName = c.getString(iquestion);
//results =(" "+ firstName + " ");
//}
return results;
} catch (Exception e) {
Log.e("ERROR","ERROR in Make test file :"+e.toString());
e.printStackTrace();
// TODO: handle exception
}
return results;
}
and in the Activity file i am just calling it as
String shoow = myDb.makeatext("question", Qno);
showQuestion.setText(shoow);
and on the top of the oncreate methode i initilized the data base asprivate final DataBaseHelper myDb = new DataBaseHelper(this);
can any one say me why this is happenig.do i need to write the for loop in the activity file also or shall i take a cursor in the activity class .
plz help me out
thanks in advance
for radio buttons the code in the database file is as follows as i have 4 buttons the code for 4 buttons will be as same as this
public String makeExtra1(String My_database_table ,int positions) {
String results = new String();
try {
String secondColumn = "Extra1";
Cursor c = myDataBase.query(true, My_database_table,
new String[] { secondColumn }, null, null, null, null, null,
null);
int iExtra1 = c.getColumnIndex(secondColumn);
if(c.moveToPosition(positions)){
results = results+c.getString(iExtra1)+"\n";
}
return results;
} catch (Exception e) {
Log.e("ERROR","ERROR in Make test file :"+e.toString());
e.printStackTrace();
// TODO: handle exception
}
return results;}
and in the Activity file
String showextra1 = myDb.makeExtra1("question", Qno);
r0.setText(showextra1);
i repeted this thing for 4 times as changing the makeExtra2,3,4 and in the assinged to r1,r2,r3 as above.

You should call Cursor.close() after reading data from it. Better to do it finally{} block.
If you want to raise only one answer per query - fill where param of myDataBase.query().

The unreachable code error is because you are writing finally{} block after return results;
Move this line after the finally{} block, eclipse will not give you any error.
Also do use myDB.close(); in this finally block.