Sebastiaan de Schaetzen
73508021f5
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65 lines
1.6 KiB
Go
65 lines
1.6 KiB
Go
package main
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import (
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"database/sql"
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"fmt"
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"log"
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)
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func CalculateEpisodeNumbers(db *sql.DB) error {
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log.Printf("Calculating episode numbers")
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// Start a transaction
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tx, err := db.Begin()
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if err != nil {
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return fmt.Errorf("error starting transaction: %w", err)
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}
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defer tx.Rollback()
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// First find all years that still need episodes numbers
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rows, err := tx.Query("select year, max((select max(episode) from videos where year = year)) from videos where episode is null group by year")
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if err != nil {
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return fmt.Errorf("error retrieving rows: %w", err)
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}
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// Loop over each year and set the missing episode numbers
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for rows.Next() {
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var year, lastEpisode int
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err = rows.Scan(&year, &lastEpisode)
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log.Printf("Last episode is %d", lastEpisode)
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if err != nil {
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return fmt.Errorf("error getting row: %w", err)
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}
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// Find all episodes that need updating
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episodes, err := tx.Query("select id from videos where year = ? and episode is null order by run, id desc", year)
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if err != nil {
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return fmt.Errorf("error retrieving episodes: %w", err)
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}
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// Update each episode
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for episodes.Next() {
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var episodeId int
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err = episodes.Scan(&episodeId)
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if err != nil {
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return fmt.Errorf("error retrieving episode id: %w", err)
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}
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// Set the episode ID
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lastEpisode++
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_, err = tx.Exec("update videos set episode = ? where id = ?", &lastEpisode, &episodeId)
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if err != nil {
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return fmt.Errorf("error updating episode id: %w", err)
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}
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}
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}
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// Commit all changes
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err = tx.Commit()
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if err != nil {
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return fmt.Errorf("error commiting changes: %w", err)
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}
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return nil
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}
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