android - Method query db to return results -


this question has answer here:

app won't run. occurs recurrently:

04-05 21:29:09.570: e/androidruntime(1069): caused by: java.lang.illegalargumentexception:     cannot bind argument @ index 1 because index out of range.      statement has 0 parameters.

main - calling method

cursor wow = db.trying("gold");        text = (textview) findviewbyid(r.id.textview13);        string quantity = wow.getstring(0); //        text.settext(quantity);

db handler - method

public cursor trying(string vg){         string q = "select quantity " + table_contacts + " name=" + "'" + vg +"'";         sqlitedatabase db = this.getreadabledatabase();         cursor  cursor = db.rawquery(q, new string[] {vg});              if (cursor != null) {                 cursor.movetofirst();             }             return cursor;     }

the problem is

 string q = "select quantity " + table_contacts + " name=" + "'" + vg +"'";

in query had specify parameter condition .after again passing query

cursor  cursor = db.rawquery(q, new string[] {vg});

this makes confusion .so try change query 

string q = "select quantity " + table_contacts + " name = ?"; sqlitedatabase db = this.getreadabledatabase(); cursor  cursor = db.rawquery(q, new string[] {vg});

or go approach

   string q = "select quantity " + table_contacts + " name=" + "'" + vg +"'";     cursor  cursor = db.rawquery(q, null);    if(cursor != null && cursor.getcount()>0){    cursor.movetofirst();    //do action    //fetch data  } else {  toast.maketext(getbasecontext(), "no records yet!", toast.length_short).show();     return; }

refer


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