Struct migration_rocksdb::ChangeColumns

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pub struct ChangeColumns {
    pub pre_columns: Option<u32>,
    pub post_columns: Option<u32>,
    pub version: u32,
}

Expand description

An even simpler migration which just changes the number of columns.

Fields

pre_columns: Option<u32>

The amount of columns before this migration.

post_columns: Option<u32>

The amount of columns after this migration.

version: u32

The version after this migration.

Trait Implementations

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impl Migration for ChangeColumns

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

Number of columns in the database before the migration.

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

Number of columns in database after the migration.

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fn version(&self) -> u32

Version of the database after the migration.

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fn alters_existing(&self) -> bool

Whether this migration alters any existing columns. if not, then column families will simply be added and migrate will never be called. Read more

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fn migrate(
 &mut self,
 _: Arc<Database>,
 _: &Config,
 _: &mut Database,
 _: Option<u32>
) -> Result<()>

Migrate a source to a destination.

Auto Trait Implementations

impl RefUnwindSafe for ChangeColumns

impl Send for ChangeColumns

impl Sync for ChangeColumns

impl Unpin for ChangeColumns

impl UnwindSafe for ChangeColumns

Blanket Implementations

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impl<T> Any for T where
T: 'static + ?Sized,

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pub fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more

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impl<T> Borrow<T> for T where
T: ?Sized,

const: unstable · source

pub fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more

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impl<T> BorrowMut<T> for T where
T: ?Sized,

const: unstable · source

pub fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more

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impl<T> From<T> for T

const: unstable · source

pub fn from(t: T) -> T

Returns the argument unchanged.

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impl<T, U> Into for T where
U: From<T>,

const: unstable · source

pub fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

source

impl<T, U> TryFrom for T where
U: Into<T>,

type Error = Infallible

The type returned in the event of a conversion error.

const: unstable · source

pub fn try_from(value: U) -> Result<T, <T as TryFrom>::Error>

Performs the conversion.

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impl<T, U> TryInto for T where
U: TryFrom<T>,

type Error = >::Error

The type returned in the event of a conversion error.

const: unstable · source

pub fn try_into(self) -> Result<U, >::Error>

Performs the conversion.

Struct migration_rocksdb::ChangeColumns

Fields

Trait Implementations

impl Migration for ChangeColumns

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

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

fn version(&self) -> u32

fn alters_existing(&self) -> bool

fn migrate(
    &mut self,
    _: Arc<Database>,
    _: &Config,
    _: &mut Database,
    _: Option<u32>
) -> Result<()>

Auto Trait Implementations

impl RefUnwindSafe for ChangeColumns

impl Send for ChangeColumns

impl Sync for ChangeColumns

impl Unpin for ChangeColumns

impl UnwindSafe for ChangeColumns

Blanket Implementations

impl<T> Any for T where
T: 'static + ?Sized,

pub fn type_id(&self) -> TypeId

impl<T> Borrow<T> for T where
T: ?Sized,

pub fn borrow(&self) -> &T

impl<T> BorrowMut<T> for T where
T: ?Sized,

pub fn borrow_mut(&mut self) -> &mut T

impl<T> From<T> for T

pub fn from(t: T) -> T

impl<T, U> Into<U> for T where
U: From<T>,

pub fn into(self) -> U

impl<T, U> TryFrom<U> for T where
U: Into<T>,

type Error = Infallible

pub fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

impl<T, U> TryInto<U> for T where
U: TryFrom<T>,

type Error = <U as TryFrom<T>>::Error

pub fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Struct migration_rocksdb::ChangeColumns

Fields

Trait Implementations

impl Migration for ChangeColumns

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

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

fn version(&self) -> u32

fn alters_existing(&self) -> bool

fn migrate( &mut self, _: Arc<Database>, _: &Config, _: &mut Database, _: Option<u32>) -> Result<()>

Auto Trait Implementations

impl RefUnwindSafe for ChangeColumns

impl Send for ChangeColumns

impl Sync for ChangeColumns

impl Unpin for ChangeColumns

impl UnwindSafe for ChangeColumns

Blanket Implementations

impl<T> Any for T where T: 'static + ?Sized,

pub fn type_id(&self) -> TypeId

impl<T> Borrow<T> for T where T: ?Sized,

pub fn borrow(&self) -> &T

impl<T> BorrowMut<T> for T where T: ?Sized,

pub fn borrow_mut(&mut self) -> &mut T

impl<T> From<T> for T

pub fn from(t: T) -> T

impl<T, U> Into<U> for T where U: From<T>,

pub fn into(self) -> U

impl<T, U> TryFrom<U> for T where U: Into<T>,

type Error = Infallible

pub fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

impl<T, U> TryInto<U> for T where U: TryFrom<T>,

type Error = <U as TryFrom<T>>::Error

pub fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

fn migrate(
&mut self,
_: Arc<Database>,
_: &Config,
_: &mut Database,
_: Option<u32>
) -> Result<()>

impl<T> Any for T where
T: 'static + ?Sized,

impl<T> Borrow<T> for T where
T: ?Sized,

impl<T> BorrowMut<T> for T where
T: ?Sized,

impl<T, U> Into<U> for T where
U: From<T>,

impl<T, U> TryFrom<U> for T where
U: Into<T>,

impl<T, U> TryInto<U> for T where
U: TryFrom<T>,