import java.io.FileInputStream;
import java.sql.*;
import java.util.Properties;

public class FkPairs {
    public static void main(String[] args) throws Exception {
        Properties props = new Properties();
        try (FileInputStream in = new FileInputStream(args[0])) { props.load(in); }
        try (Connection conn = DriverManager.getConnection(props.getProperty("url"), props.getProperty("username"), props.getProperty("password"))) {
            String sql =
                "SELECT OBJECT_NAME(fk.parent_object_id) AS parent_table, " +
                "       OBJECT_NAME(fk.referenced_object_id) AS ref_table, " +
                "       fk.name AS fk_name, " +
                "       STRING_AGG(pc.name + ' -> ' + rc.name, ', ') WITHIN GROUP (ORDER BY fkc.constraint_column_id) AS cols " +
                "FROM sys.foreign_keys fk " +
                "JOIN sys.foreign_key_columns fkc ON fkc.constraint_object_id = fk.object_id " +
                "JOIN sys.columns pc ON pc.object_id = fk.parent_object_id AND pc.column_id = fkc.parent_column_id " +
                "JOIN sys.columns rc ON rc.object_id = fk.referenced_object_id AND rc.column_id = fkc.referenced_column_id " +
                "WHERE fk.parent_object_id <> fk.referenced_object_id " +
                "GROUP BY fk.name, fk.parent_object_id, fk.referenced_object_id " +
                "ORDER BY parent_table, fk_name";
            try (Statement st = conn.createStatement(); ResultSet rs = st.executeQuery(sql)) {
                System.out.println("=== CROSS-TABLE FK ASSOCIATIONS (two tables linked) ===");
                String curPair = "";
                int n = 0;
                while (rs.next()) {
                    String pair = rs.getString("parent_table") + " -> " + rs.getString("ref_table");
                    if (!pair.equals(curPair)) {
                        curPair = pair;
                        n++;
                        System.out.println();
                        System.out.println("[" + n + "] " + pair);
                    }
                    System.out.println("      FK " + rs.getString("fk_name") + "  ( " + rs.getString("cols") + " )");
                }
            }
        }
    }
}