How do I create a pie chart that displays the quantity of something registered by each someone?

Question

In my project, I want to display in the pie chart how many institutions each employee registered in the system. The institutions table contains a foreign key with the id of the

Answer 1

You don't need the PreparedStatement. Use the org.jfree.data.jdbc.JDBCPieDataset constructor that accepts a query "that returns data in two columns, the first containing VARCHAR data, and the second containing numerical data." You can use the dataset in your ChartFactory.

JDBCPieDataset ds = new JDBCPieDataset(conn, "SELECT ...");

A complete example is shown here.