Ktorm migration support

Related tags

Miscellaneous ktorm-migration
Overview

ktorm-migration

Ktorm migration support

Status

Needs a full tutorial, supporting tools, and more testing, but otherwise complete.

Usage

In your app, use MigratableTable, MigratableBaseTable, MigratableMapTable, or MigratableTableMixin instead of your usual tables.

You now have access to additional extension functions on your types, including

column.size(128)  // For size of varchar, etc
column.default("Default Value")
column.default(otherColumn)  // Can be an expression instead
column.unique()  // Adds a unique constraint
column.foreignKey(OtherTable)  // Adds a foreign key constraint
column.notNull()

Create Migrations

When you first start, create the migrations folder using the function initializeMigrations. This will generate a LatestMigration.kt you can use later.

initializeMigrations(
    folder = File("src/test/kotlin/org/ktorm/testmigrations"),
    packageName = "org.ktorm.testmigrations"
)

Then we can start using makeMigrations to automatically create new migrations for us:

makeMigrations(
    folder = File("src/test/kotlin/org/ktorm/testmigrations"),
    packageName = "org.ktorm.testmigrations",
    latestMigration = LatestMigration,
    tables = arrayOf(
        // All of your tables go here
        Departments,
        Employees,
        Customers
    )
)

This will populate the folder with your migrations.

Run Migrations

myDatabase.migrate(LatestMigration)

Known issues

  • We need a lot more testing
  • Transformed fields are unsupported in automatic migration generation, due to being not being reproducible in source.
  • No specific database Dialect implements SqlSchemaFormatter yet
    • Specific implementations are gonna be annoying. This repo will need a module for every supported one.
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Comments
  • Publish the package

    Publish the package

    Hi and thanks a lot to the Ktorm authors and maintainers for the amazing work.

    Was wondering if this package is published somewhere or if there is any plan to do so. I understand it is incomplete but maybe an alpha/dev release can be a reasonable solution.

    opened by SimoneStefani 0
Owner
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Kotlin ORM framework with strong-typed SQL DSL and sequence APIs.
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