How to read the values in SQL - sql

Question

I am tying to read the values in SQl.
I am creating one purchase order If suppose any body has updated the price for the inventory then I am first checking that price is available or not.
If that price is not available then I am First Inserting that price into the datbase & then map new price with the inventory.
I have already achieved this functionality but I have wrote five inline query for this now i need to
change the code & replace with the single stored procedure. & how I can write the logic into the SQL
Here is my code with the explanation
//Checking that Buying Price Is Exist or not
//string CheckingIBM = "select * from RS_Inventory_Buying_Master where buying_price ='" + UpdatedPrice + "'";
//cm.TableConnect(CheckingIBM);
//If Buying Price is Exist then Update PIIM table with new buying_product_id
if (cmIS_Price_Exist.rs.Read())
{
//If Buying Price is Exist then Update PIIM table with new buying_product_id
common cm1 = new common();
string BuyingProductId = cmIS_Price_Exist.rs["buying_product_id"].ToString();
string UpdatePIIM = "update RS_Purchase_Invoice_Info_Master set buying_product_id = '" + BuyingProductId + "', qty = '" + UpdatedQuantity + "',tax_id ='" + TaxDetails + "',picreated = 1 where purchase_order_no = '" + PO + "' and product_id = '" + ProductId + "'";
cm1.TableInsert(UpdatePIIM);
cm1.con.Close();
}
//If Buying Price does not Exist then first Insert the price & then Update the other tables
else
{
//If Price is not exist then firsrt insert the price
common cm2 = new common();
string InsertBuyingPrice = "insert into RS_Inventory_Buying_Master (buying_price,latest) values ('" + UpdatedPrice + "','0')";
cm2.TableInsert(InsertBuyingPrice);
cm2.con.Close();
//After inserting the price find the buying product Id of that price
common cm3 = new common();
string FindingUpdatedPrice = "select * from RS_Inventory_Buying_Master where buying_price ='" + UpdatedPrice + "'";
cm3.TableConnect(FindingUpdatedPrice);
//Now finallly after finding the buying price id by using the inserted Price. Now update the buying product id of PIIM
if (cm3.rs.Read())
{
string BuyingProductId = cm3.rs["buying_product_id"].ToString();
//Now finallly after finding the buying price id. Now update the buying product id of PIIM
common cm4 = new common();
string UpdatePIIM = "update RS_Purchase_Invoice_Info_Master set buying_product_id = '" + BuyingProductId + "', qty = '" + UpdatedQuantity + "',tax_id ='" + TaxDetails + "',picreated = 1 where purchase_order_no = '" + PO + "' and product_id = '" + ProductId + "'";
cm4.TableInsert(UpdatePIIM);
cm4.con.Close();
}
cm3.con.Close();
}
Any suggesion will be appreciated.

Answer 1

declare #BuyingProductId varchar(50)
set #BuyingProductId = (select isnull(buying_product_id, '') from RS_Inventory_Buying_Master where buying_price = #UpdatedPrice)
if(#BuyingProductId <> '')
begin
--your update query
update RS_Purchase_Invoice_Info_Master set buying_product_id = #BuyingProductId ,
qty = #UpdatedQuantity ,tax_id = #TaxDetails ,picreated = 1
where purchase_order_no = #PO
and product_id = #ProductId ;
end
else
begin
--your insert query
insert into RS_Inventory_Buying_Master (buying_price,latest)
values (#UpdatedPrice,'0')
set #BuyingProductId = (SELECT ##IDENTITY)
update RS_Purchase_Invoice_Info_Master set buying_product_id = #BuyingProductId ,
qty = #UpdatedQuantity ,tax_id = #TaxDetails ,picreated = 1
where purchase_order_no = #PO
and product_id = #ProductId ;
end
Check with this query. Please make sure to create new sp and provide all the value like #UpdatedQuantity etc.