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39 lines
1.9 KiB
Markdown
39 lines
1.9 KiB
Markdown
# Guides
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## ORM
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Woodpecker uses [Xorm](https://xorm.io/) as ORM for the database connection.
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You can find its documentation at [gobook.io/read/gitea.com/xorm](https://gobook.io/read/gitea.com/xorm/manual-en-US/).
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## Add a new migration
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Woodpecker uses migrations to change the database schema if a database model has been changed. If for example a developer removes a property `Counter` from the model `Repo` in `server/model/` they would need to add a new migration task like the following example to a file like `server/store/datastore/migration/004_repos_drop_repo_counter.go`:
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```go
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package migration
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import (
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"xorm.io/xorm"
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)
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var alterTableReposDropCounter = task{
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name: "alter-table-drop-counter",
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fn: func(sess *xorm.Session) error {
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return dropTableColumns(sess, "repos", "repo_counter")
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},
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}
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```
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:::info
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Adding new properties to models will be handled automatically by the underlying [ORM](#orm) based on the [struct field tags](https://stackoverflow.com/questions/10858787/what-are-the-uses-for-tags-in-go) of the model. If you add a completely new model, you have to add it to the `allBeans` variable at `server/store/datastore/migration/migration.go` to get a new table created.
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:::
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:::warning
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You should not use `sess.Begin()`, `sess.Commit()` or `sess.Close()` inside a migration. Session / transaction handling will be done by the underlying migration manager.
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:::
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To automatically execute the migration after the start of the server, the new migration needs to be added to the end of `migrationTasks` in `server/store/datastore/migration/migration.go`. After a successful execution of that transaction the server will automatically add the migration to a list, so it won't be executed again on the next start.
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## Constants of official images
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All official default images, are saved in [shared/constant/constant.go](https://github.com/woodpecker-ci/woodpecker/blob/master/shared/constant/constant.go) and must be pinned by an exact tag.
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