# Struct ethcore::migrations::state::OverlayRecentV7 [−] [src]

    pub struct OverlayRecentV7 { /* fields omitted */ }

Version for `OverlayRecent` database. more involved than the archive version because of journaling.

## Trait Implementations

### `impl Default for OverlayRecentV7`
[src]

#### `fn default() -> OverlayRecentV7`

Returns the "default value" for a type. Read more

### `impl Migration for OverlayRecentV7`
[src]

#### `fn columns(&self) -> Option<u32>`

Number of columns in database after the migration.

#### `fn version(&self) -> u32`

Version of the database after the migration.

#### `fn migrate(&mut self,
source: Arc<Database>,
config: &Config,
dest: &mut Database,
col: Option<u32>)
-> Result<(), Error>`

Migrate a source to a destination.

#### `fn pre_columns(&self) -> Option<u32>`

Number of columns in the database before the migration.

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