How can i check to see if my sqlite table has data in it?

Question

EDIT, Changed the code slightly based on answers below, but still haven\'t got it working. I also added a log message to tell me if getCount was returning > 0, and i

Answer 1

public boolean isEmpty(String TableName){

SQLiteDatabase database = this.getReadableDatabase();
return (int) DatabaseUtils.queryNumEntries(database,TableName) == 0;
}

Answer 2

you mean if it has record right ? i've tried this and for me it's work

    dbCur = db.rawQuery("select * from player", null);
    Log.e("a", ""+dbCur.getCount());

it will show the sum of the table, if the table doesn't have record, then it will show 0.

Answer 3

Use this:

public Boolean doesRecordExist(String TableName, String ColumnName, String ColumnData) {
    String q = "Select * FROM "+TableName+" WHERE "+ColumnName+"='"+ColumnData+"';";
    SQLiteDatabase db = this.getWritableDatabase();
    Cursor cursor = db.rawQuery(q, null);
    if (cursor.moveToFirst()) {
        return true;
    } else {
        return false;
    }
}

---

Example

if (doesRecordExist("student", "name", "John") == true)
 {
 //Do Something
 } else { //Do something
 }

---

Modify This according to your usage:

String q = "Select * FROM "+TableName+" WHERE "+ColumnName+"='"+ColumnData+"';";

Answer 4

Here's what I did...

Cursor cur = db.rawQuery("SELECT count(*) FROM " + SQLHelper.TABLE_CART, null);
if (cur != null && cur.moveToFirst() && cur.getInt(0) > 0) {
    Log.i(getClass().getName(), "table not empty");
} 
else {
    Log.i(getClass().getName(), "table is empty");
}

Answer 5

for java programs this worked for me:

    ResultSet rst = stm.executeQuery("SELECT * from Login");
           int i = 0;
           while(rst.next()){
               ++i;
               System.out.println(i);
           }
           System.out.println(i);
           if(i<1){
               //No data in the table
           }
           else{
               //data exists
           }

Answer 6

What about this query?

SELECT CASE WHEN EXISTS (SELECT * FROM CAT_BUD_TAB) THEN 1 ELSE 0 END

It's slightly faster that SELECT COUNT(*).

P.S. Checked on tables with 9 million rows.