Struct M0003 

pub struct M0003;

Migration that drops the snapshot table and extends the event name column.

This migration makes two changes to optimize the schema:

Changes

1. Drops the snapshot table - The snapshot functionality has been removed from Evento, so this table is no longer needed.

2. Extends event.name column - Changes the name column from VARCHAR(20) to VARCHAR(50) to accommodate longer event type names.

Database-Specific Notes

• SQLite: The column alteration is a no-op since SQLite doesn’t support ALTER COLUMN. The column was already created with sufficient length.
• MySQL: Uses MODIFY COLUMN syntax.
• PostgreSQL: Uses standard ALTER COLUMN syntax.

Dependencies

This migration depends on M0002.

Trait Implementations

impl Migration<MySql> for M0003

fn app(&self) -> &str

Returns the application name associated with the migration. This can be the name of the folder or library where the migration is located.

fn name(&self) -> &str

Returns the migration name, typically the file name without the extension.

fn parents(&self) -> Vec<Box<dyn Migration<MySql>>>

Returns the list of parent migrations.

fn operations(&self) -> Vec<Box<dyn Operation<MySql>>>

Returns the operations associated with this migration.

fn replaces(&self) -> Vec<Box<dyn Migration<DB>>>

Returns the list of migrations that this migration replaces.

fn run_before(&self) -> Vec<Box<dyn Migration<DB>>>

Returns the list of migrations that this migration must run before(when applying) or after (when reverting).

fn is_atomic(&self) -> bool

Indicates whether the migration is atomic. By default, this function returns true, meaning the migration is atomic.

fn is_virtual(&self) -> bool

Indicates whether the migration is virtual. By default, this function returns false, meaning the migration is not virtual.

impl Migration<Postgres> for M0003

fn app(&self) -> &str

Returns the application name associated with the migration. This can be the name of the folder or library where the migration is located.

fn name(&self) -> &str

Returns the migration name, typically the file name without the extension.

fn parents(&self) -> Vec<Box<dyn Migration<Postgres>>>

Returns the list of parent migrations.

fn operations(&self) -> Vec<Box<dyn Operation<Postgres>>>

Returns the operations associated with this migration.

fn replaces(&self) -> Vec<Box<dyn Migration<DB>>>

Returns the list of migrations that this migration replaces.

fn run_before(&self) -> Vec<Box<dyn Migration<DB>>>

Returns the list of migrations that this migration must run before(when applying) or after (when reverting).

fn is_atomic(&self) -> bool

Indicates whether the migration is atomic. By default, this function returns true, meaning the migration is atomic.

fn is_virtual(&self) -> bool

Indicates whether the migration is virtual. By default, this function returns false, meaning the migration is not virtual.

impl Migration<Sqlite> for M0003

fn app(&self) -> &str

Returns the application name associated with the migration. This can be the name of the folder or library where the migration is located.

fn name(&self) -> &str

Returns the migration name, typically the file name without the extension.

fn parents(&self) -> Vec<Box<dyn Migration<Sqlite>>>

Returns the list of parent migrations.

fn operations(&self) -> Vec<Box<dyn Operation<Sqlite>>>

Returns the operations associated with this migration.

fn replaces(&self) -> Vec<Box<dyn Migration<DB>>>

Returns the list of migrations that this migration replaces.

fn run_before(&self) -> Vec<Box<dyn Migration<DB>>>

Returns the list of migrations that this migration must run before(when applying) or after (when reverting).

fn is_atomic(&self) -> bool

Indicates whether the migration is atomic. By default, this function returns true, meaning the migration is atomic.

fn is_virtual(&self) -> bool

Indicates whether the migration is virtual. By default, this function returns false, meaning the migration is not virtual.