<![CDATA[How can i store data of database's different categories]]>I want to export data into CSV format, i have this table it has column for customer id, product category id and price of product that customer bought.
edfb274f-9955-4b4d-a21b-9c270592f9b6-image.png
I want to export below table to CSV for all products. First row is customer id and column under every customer id is prices of products that customer bought.

The question is how can i store data of prices by user and product. I tryed to use queries and arrays, but i don't know how many there will be values.

0a493374-6356-44a7-a630-aef8f1b52b6b-image.png

To export to CSV i store all data in QString value with ';' for next column and \n for next row and then transimt QString value.

]]>https://forum.qt.io/topic/141921/how-can-i-store-data-of-database-s-different-categoriesRSS for NodeSun, 19 Apr 2026 14:33:08 GMTTue, 03 Jan 2023 20:42:35 GMT60<![CDATA[Reply to How can i store data of database's different categories on Sun, 08 Jan 2023 11:58:20 GMT]]>Solved by creating QTableWidget. I transmited data from database in QTableWidget one query in a column and then row by row added data from QTableWidget to QString value to export it later to CSV.

]]>https://forum.qt.io/post/742971https://forum.qt.io/post/742971Sun, 08 Jan 2023 11:58:20 GMT<![CDATA[Reply to How can i store data of database's different categories on Wed, 04 Jan 2023 19:52:58 GMT]]>One issue with your CSV, you are losing the information about which product belongs to which prize unless you also state that each row corresponds to a product ID.

]]>https://forum.qt.io/post/742548https://forum.qt.io/post/742548Wed, 04 Jan 2023 19:52:58 GMT<![CDATA[Reply to How can i store data of database's different categories on Wed, 04 Jan 2023 10:28:16 GMT]]>@ChrisW67 Yes this is what i want.

]]>https://forum.qt.io/post/742444https://forum.qt.io/post/742444Wed, 04 Jan 2023 10:28:16 GMT<![CDATA[Reply to How can i store data of database's different categories on Wed, 04 Jan 2023 06:21:07 GMT]]>@Kuji Let me see if I have this straight. You want to take the table of data you show and produce this table with an unbounded number of columns (one per customer), a header row containing the customer number for each column, and an unbounded number of rows (as many rows as the maximum number of orders made by any customer).

0       1       2
1999    2499    1399
1349    null    null
]]>https://forum.qt.io/post/742407https://forum.qt.io/post/742407Wed, 04 Jan 2023 06:21:07 GMT<![CDATA[Reply to How can i store data of database's different categories on Tue, 03 Jan 2023 21:10:03 GMT]]>@SGaist How can create query if there can be any amount of customers and products? The problem is i can't just take all prices, because they have different categories.

Looks like query should store prices by queue from 0 to last customer, and after last customer's price again 0 to last customer, but i can't figure out how to do this.

]]>https://forum.qt.io/post/742369https://forum.qt.io/post/742369Tue, 03 Jan 2023 21:10:03 GMT<![CDATA[Reply to How can i store data of database's different categories on Tue, 03 Jan 2023 20:46:01 GMT]]>Hi,

Why do you need to know the exact number of rows ?

Just loop over the result of your query and add one line for each row the query returned.

]]>https://forum.qt.io/post/742368https://forum.qt.io/post/742368Tue, 03 Jan 2023 20:46:01 GMT