mirror of
https://github.com/ordinary-dev/phoenix
synced 2024-09-20 03:40:29 +05:00
Ivan R.
5aa2cee5b1
Since I started simplifying, I decided to abandon ORM. I won’t say that this makes much sense, everything works more or less as before. Except that the size of the program has decreased slightly again, by about a megabyte.
99 lines
2.1 KiB
Go
99 lines
2.1 KiB
Go
package database
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import (
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"database/sql"
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"errors"
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"fmt"
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log "github.com/sirupsen/logrus"
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)
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// List of migrations that should be applied.
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// Migration ID = index + 1.
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var migrations = []string{
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`CREATE TABLE IF NOT EXISTS admins (
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id INTEGER PRIMARY KEY,
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username TEXT NOT NULL UNIQUE,
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bcrypt TEXT NOT NULL
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)`,
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`CREATE TABLE IF NOT EXISTS groups (
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id INTEGER PRIMARY KEY,
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name TEXT
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)`,
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`CREATE TABLE IF NOT EXISTS links (
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id INTEGER PRIMARY KEY,
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name TEXT NOT NULL,
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href TEXT NOT NULL,
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group_id INTEGER NOT NULL,
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icon TEXT,
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CONSTRAINT fk_groups_links
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FOREIGN KEY (group_id)
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REFERENCES groups(id)
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ON DELETE CASCADE
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)`,
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}
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func ApplyMigrations() error {
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// Create a table to record applied migrations and retrieve the saved data.
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_, err := DB.Exec(`CREATE TABLE IF NOT EXISTS migrations (
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version INTEGER NOT NULL DEFAULT 0
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)`)
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if err != nil {
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return err
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}
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var currentVersion int
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err = DB.
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QueryRow("SELECT version FROM migrations").
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Scan(¤tVersion)
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if err != nil {
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if !errors.Is(err, sql.ErrNoRows) {
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return err
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}
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// The table is empty, create a record.
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_, err = DB.Exec("INSERT INTO migrations (version) VALUES (0)")
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if err != nil {
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return err
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}
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}
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// Apply all migrations.
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for i, migration := range migrations {
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migrationID := i + 1
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if migrationID <= currentVersion {
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continue
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}
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if err := applyMigration(migrationID, migration); err != nil {
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return fmt.Errorf("migration #%d: %w", migrationID, err)
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}
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log.Infof("Migration #%v has been applied", migrationID)
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}
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return nil
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}
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func applyMigration(migrationID int, query string) error {
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tx, err := DB.Begin()
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if err != nil {
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return err
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}
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defer tx.Rollback()
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if _, err := tx.Exec(query); err != nil {
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return fmt.Errorf("error when applying migration: %w", err)
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}
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if _, err := tx.Exec("UPDATE migrations SET version = ?", migrationID); err != nil {
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return fmt.Errorf("error when updating schema version: %w", err)
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}
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if err := tx.Commit(); err != nil {
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return err
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}
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return nil
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}
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