java - How to multiply SQL columns from 2 tables and insert into a seperate column? -

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i trying write sql android application takes quantity of inventory 1 table multiply price of item in table total store column. based on have read seems pretty simple, isn't working me. have tried multiple solutions, @ point have done put sql code in separate method called totalprice() called on button click in method.

public static final string table_invoice = "invoice"; public static final string invoice_id = "invoice_id"; public static final string invoice_date = "date";  public static final string table_inventory = "inventory"; public static final string inventory_id = "inventory_id"; public static final string inventory_item = "item"; public static final string inventory_xs = "extrasmall"; public static final string inventory_s = "small"; public static final string inventory_m = "medium"; public static final string inventory_l = "large"; public static final string inventory_xl = "extralarge"; public static final string inventory_xxl = "extraextralarge"; public static final string inventory_price = "price";  public static final string table_ordered = "ordered"; public static final string ordered_id = "ordered_id"; public static final string ordered_item = "item"; public static final string ordered_size = "size"; public static final string ordered_quantity = "quantity"; public static final string ordered_total = "total";  public dbhelper(context context){     super(context, db_name, null, db_version); }  public void oncreate(sqlitedatabase db) {     string create_customer_table = "create table " + table_customer + " ("             + c_customer_id + " integer primary key, "             + c_customer_name + " text, "             + c_email + " text, "             + c_street_address + " text, "             + c_city + " text, "             + c_state + " text, "             + c_zip + " text, "             + c_phone + " text "             + ")";      string create_inventory_table = "create table " + table_inventory + " ("             + inventory_id + " integer primary key, "             + inventory_item + " text, "             + inventory_xs + " text, "             + inventory_s + " text, "             + inventory_m + " text, "             + inventory_l + " text, "             + inventory_xl + " text, "             + inventory_xxl + " text, "             + inventory_price + " real "             + ")";      string create_invoice_table = "create table " + table_invoice + " ("             + invoice_id + " integer primary key, "             + invoice_date + " datetime, "             + c_customer_id + " integer, "             + "foreign key(" + c_customer_id + ") references " + table_customer + " (" + c_customer_id + "));";      string create_ordered_table = "create table " + table_ordered + " ("             + ordered_id + " integer primary key, "             + ordered_item + " text, "             + ordered_size + " text, "             + ordered_quantity + " integer, "             + ordered_total + " real, "             + inventory_id + " integer, "             + "foreign key(" + inventory_id + ") references " + table_inventory + " (" + inventory_id + "));";      db.execsql(create_customer_table);     db.execsql(create_inventory_table);     db.execsql(create_invoice_table);     db.execsql(create_ordered_table);  }  @override public void onupgrade(sqlitedatabase db, int oldversion, int newversion) {     // drop older table if existed     db.execsql("drop table if exists " + table_customer);      //create tables again     this.oncreate(db); }  public cursor totalprice() {     //open database     sqlitedatabase db = this.getwritabledatabase();      cursor res = db.rawquery("select " + ordered_quantity + ", " + inventory_price + ", " +             ordered_quantity + " * " + inventory_price + " " + ordered_total +             " " + table_ordered + " inner join " + table_inventory +             " on ordered." + inventory_id + " = inventory." + inventory_id, null);     return res; }

i have class calls method within button click.

public class addinvoice extends appcompatactivity { button addinvoice; dbhelper db; edittext date, cid, item, size, invid, quantity;   @override protected void oncreate(bundle savedinstancestate) {     super.oncreate(savedinstancestate);     setcontentview(r.layout.activity_add_invoice);     toolbar toolbar = (toolbar) findviewbyid(r.id.toolbar);     setsupportactionbar(toolbar);     db = new dbhelper(this);      addinvoice = (button) findviewbyid(r.id.btnaddtoinvoice);     date = (edittext) findviewbyid(r.id.etdate);     cid = (edittext) findviewbyid(r.id.etcid);     item = (edittext) findviewbyid(r.id.itemname);     size = (edittext) findviewbyid(r.id.etsize);     invid = (edittext) findviewbyid(r.id.etaddinventoryid);     quantity = (edittext) findviewbyid(r.id.etquantity);      addinvoice.setonclicklistener(             new view.onclicklistener() {                 @override                 public void onclick(view v) {               addinvoice();               addordereditem();               db.totalprice();               date.settext("");               cid.settext("");               item.settext("");               size.settext("");               invid.settext("");               quantity.settext("");                 }             }     );               getsupportactionbar().setdisplayhomeasupenabled(true);           }  public void addordereditem() {      boolean isinserted = db.addordereditem(item.gettext().tostring(), size.gettext().tostring(), integer.parseint(invid.gettext().tostring()),             integer.parseint(quantity.gettext().tostring()));     db.totalprice();         if (isinserted == true)             toast.maketext(addinvoice.this, "item inserted", toast.length_short).show();         else             toast.maketext(addinvoice.this, "item not inserted", toast.length_short).show();         }  public void addinvoice(){     boolean isinserted = db.addinvoice(date.gettext().tostring(), cid.gettext().tostring());         if (isinserted == true)             toast.maketext(addinvoice.this, "invoice inserted", toast.length_short).show();         else             toast.maketext(addinvoice.this, "invoice not inserted", toast.length_short).show(); }

}

now when run code value stored in total price column null. help.

i assume wants execute following inner join query:

select column1 * column2 result table1 t1    inner join table2 t2 dt on t1.key = t2.key

and free use value in java code.


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