Develop Reference

cursor count(*) getCount working badly

I want to check if there's a record in my table Users corresponding to an id_user, in case there isn't I will add it. The problem is that my Cursor.getCount() returns 1 and it doesn't make sense because my table is completely empty.
Cursor c = db.rawQuery("SELECT count(*) FROM Users WHERE id_user = '"
+ jsonObj.getString("id_user") + "'", null);
Log.i("getUser cursor",c.getCount() + ""); // it prints 1
c.moveToFirst();
int ic = c.getInt(0);
Log.i("getUser count2", ic + ""); // it prints 0
Why c.getCount() is giving me 1 when there is not absolutely any record. However, c.getInt(0) seems to work fine.
Thanks

Because you are getting a row back in your query.
Select count(*)
will return one rows containing the count of records. The count of records is 0, thus it returns one row, containing the value 0.
Select *
then
c.getCount()
Would return the 0 you are expecting because you are pulling back all rows, (not a count of rows) and there are no rows. But this is a bad approach since it can pull back extra data and might be slow.
in this case
int ic = c.getInt(0); is the proper way to get the data you want.

Why is SELECT COUNT (*) returning 1

Why is my getAccountCount only returning 1 when there are multiple entries in my database. Is this not the proper way to get the number of entries in my ACCOUNTS table?
getAccountCount
int getAccountCount() {
SQLiteDatabase db = this.getReadableDatabase();
Cursor cur = db.rawQuery("SELECT COUNT (*) FROM " + ACCOUNTS, null);
int x = cur.getCount();
cur.close();
return x;
}
Calling it from another activity
dbHelper = new DatabaseHelper(this);
txtNo.setText(String.valueOf(dbHelper.getAccountCount()));
Slightly embarrassed with my slip-up so here's an attempt to recover a little dignity ;_;.
In any case apologies for my mistake and thank you for the help. I'm fiddling with a tutorial code which had SELECT * FROM myTable originally but I read somewhere that using SELECT * in a large db could potentially affect performance as SELECT * gives the list of records with all columns from the table whereas SELECT COUNT * just counts the rows. But when I replaced SELECT * FROM myTable with SELECT COUNT (*) FROM myTable I forgot to change the interpretation of cur and just continued under the assumption that my getAccountCount() was fine.
Again, thank you for the help and criticism, both are appreciated. Cheers!

Why is my getAccountCount only returning 1 when there are multiple
entries in my database
Because Cursor.getCount() return number for rows in current cursor instead of count value.
To get COUNT value from cursor use Cursor.getInt with 0 position :
cur.moveToFirst();
int x = mcursor.getInt(0);

This will return nomber of entries in table
int numRows =(int) DatabaseUtils.queryNumEntries(db, "table_name");

You don't want getCount().
Even if the result of Select COUNT (*) is 5, getCOunt() will be 1...
you should rather do something like
if (cursor.moveToFirst()) // data?
System.out.println(cursor.getInt(0);

sqlite android select sum

my table look like this:
Client_Code Oder_ID NoOrd Weight
850458 5 1 12
850458 5 2 12
850458 6 1 5
i want to sum the Weight, but unique par Oder_ID.
so the resultat that i want is 17 = 12 + 5
not 29
how can i do that ?
my code like this;
public int GetPoids()
{
String SQL_syntax = "SELECT SUM("+ DBHelper.KEY_Poids +") as SumPoids FROM " + DBHelper.tableName + " GROUP BY " + DBHelper.KEY_CodeClient +","+DBHelper.KEY_NoOrdre ;
Cursor c = database.rawQuery(SQL_syntax, null);
if (c != null)
c.moveToFirst();
int Poids = c.getInt(0);
c.close();
return Poids;
}

Give a try, First you need to get unique OrderIds then take only one record of that OrderId with one more condition NoOrd=1 (it must have atleast NoOrd=1 in each record)
select sum(Weight) from Table_Name where Order_ID in (select distinct Order_ID from Table_Name) and NoOrd=1
Sorry if it doesn't help you, actually I tried on a online tool due to lack of your database structure.

Sort SQLite database by a parameter

I have a database with tow parameters one is a string called app_name the other one is an integer of how many times the app was opened.
After running the code
String[] columns = new String[]{KEY_ROWID,KEY_NAME,KEY_OPENED};
Cursor c = database.query(DATABASE_TABLE,columns,null,null,null,null,null);
String result = "";
int iRow = c.getColumnIndex(KEY_ROWID);
int iAppName = c.getColumnIndex(KEY_NAME);
int iTimesOpened = c.getColumnIndex(KEY_OPENED);
for(c.moveToFirst();!c.isAfterLast();c.moveToNext()){
result = result+c.getString(iRow)+" "+c.getString(iAppName)+" //"+c.getString(iTimesOpened)+"\n";
}
return result;
result equals:
1 dialer 1
2 whatsapp 7
3 facebook 20
4 google play store 10
I want the result to be sorted by the times opened so it will look like this
1 facebook 20
2 google play store 10
3 whatsapp 7
4 dialer 1
How can i change that order?

Cursor c = database.query(DATABASE_TABLE,columns,null,null,null,null, KEY_OPENED);
The last parameter to query is ORDER BY.
If you want to order by the integer value of the KEY_OPENED column, you can use CAST operator to cast the value of the field into an integer.
Cursor c = database.query(DATABASE_TABLE,columns,null,null,null,null, "CAST( " + KEY_OPENED + " AS INTEGER)");

use this
Cursor c = scoreDb.query(DATABASE_TABLE, rank, null, null, null, null, yourColumn+" DESC");
Refer this documentation to understand more about query method.

Counting text matches in sqlite

I am querying several columns in a table for some words (essentially querying m text columns whether they contain n terms which are entered by the user), and I want to rank these rows by how many matches occur.
So I have something like this query :
SELECT *, (COLUMN1 LIKE '%TERM1%') + (COLUMN1 LIKE '%TERM2%') + ... + (COLUMN1 LIKE '%TERMN%') + (COLUMN2 LIKE '%TERM1%') + ... + (COLUMNM LIKE '%TERMN%') AS SCORE
FROM TABLE_NAME
WHERE COLUMN1 LIKE '%TERM1%' OR ... OR COLUMNM LIKE '%TERMN%'
ORDER BY SCORE DESC LIMIT 200;
But this query does not seem to work all the time, sometimes all the results seem to have score 0, even when there are matches. Can anybody suggest what the problem is? I suspect it might be something to do with the type of result of LIKE operator and the type of score column.
Also, is there some better way of doing the same thing without generating this verbose query?

yes there another way using code
try this
long cnt = countdata("COLUMN1 LIKE %TERM1%")
:
public Long countdata(String whereClause) {
long count = 0;
Cursor c = mDb.rawQuery("SELECT count(*) FROM TABLENAME WHERE " + whereClause, null);
int numRows = c.getCount();
c.moveToFirst();
for (int i = 0; i < numRows; ++i) {
Log.i("Count", c.getString(0));
count = c.getLong(0);
c.moveToNext();
}
c.close();
return Long.valueOf(count);
}