# Struct ethcore::migrations::state::ArchiveV7 [−] [src]

    pub struct ArchiveV7(_);

Version for `ArchiveDB`.

## Trait Implementations

### `impl Default for ArchiveV7`
[src]

#### `fn default() -> ArchiveV7`

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

### `impl SimpleMigration for ArchiveV7`
[src]

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

Number of columns in database after the migration.

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

Version of database after the migration.

#### `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. Read more

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