Trait SimpleMigration

pub trait SimpleMigration {
    // Required methods
    fn columns(&self) -> u32;
    fn version(&self) -> u32;
    fn migrated_column_index(&self) -> u32;
    fn simple_migrate(
        &mut self,
        key: Vec<u8>,
        value: Vec<u8>,
    ) -> Option<(Vec<u8>, Vec<u8>)>;
}

A simple migration over key-value pairs of a single column.

Required Methods

fn columns(&self) -> u32

Number of columns in database after the migration.

fn version(&self) -> u32

Version of database after the migration.

fn migrated_column_index(&self) -> u32

Index of column which should be migrated.

fn simple_migrate( &mut self, key: Vec<u8>, value: Vec<u8>, ) -> Option<(Vec<u8>, Vec<u8>)>

Should migrate existing object to new database. Returns None if the object does not exist in new version of database.

Implementors