Struct rusqlite_migration::Migrations
source · pub struct Migrations<'m> { /* private fields */ }
Expand description
Set of migrations
Implementations§
source§impl<'m> Migrations<'m>
impl<'m> Migrations<'m>
sourcepub fn new(ms: Vec<M<'m>>) -> Self
pub fn new(ms: Vec<M<'m>>) -> Self
Create a set of migrations.
§Example
use rusqlite_migration::{Migrations, M};
let migrations = Migrations::new(vec![
M::up("CREATE TABLE animals (name TEXT);"),
M::up("CREATE TABLE food (name TEXT);"),
]);
sourcepub fn from_directory(dir: &'static Dir<'static>) -> Result<Self>
Available on crate feature from-directory
only.
pub fn from_directory(dir: &'static Dir<'static>) -> Result<Self>
from-directory
only.Creates a set of migrations from a given directory by scanning subdirectories with a specified name pattern. The migrations are loaded and stored in the binary.
§Directory Structure Requirements
The migration directory pointed to by include_dir!()
must contain
subdirectories in accordance with the given pattern:
{usize id indicating the order}-{convenient migration name}
Those directories must contain at lest an up.sql
file containing a valid upward
migration. They can also contain a down.sql
file containing a downward migration.
§Example structure
migrations
├── 01-friend_car
│ └── up.sql
├── 02-add_birthday_column
│ └── up.sql
└── 03-add_animal_table
├── down.sql
└── up.sql
§Example
use rusqlite_migration::Migrations;
use include_dir::{Dir, include_dir};
static MIGRATION_DIR: Dir = include_dir!("$CARGO_MANIFEST_DIR/../examples/from-directory/migrations");
let migrations = Migrations::from_directory(&MIGRATION_DIR).unwrap();
§Errors
Returns Error::FileLoad
in case the subdirectory names are incorrect,
or don’t contain at least a valid up.sql
file.
sourcepub fn new_iter<I: IntoIterator<Item = M<'m>>>(ms: I) -> Self
👎Deprecated: Use the FromIterator
trait implementation instead. For instance, you can call Migrations::from_iter.
pub fn new_iter<I: IntoIterator<Item = M<'m>>>(ms: I) -> Self
FromIterator
trait implementation instead. For instance, you can call Migrations::from_iter.Deprecated: Migrations
now implements FromIterator
, so use Migrations::from_iter
instead.
Performs allocations transparently.
sourcepub fn current_version(&self, conn: &Connection) -> Result<SchemaVersion>
pub fn current_version(&self, conn: &Connection) -> Result<SchemaVersion>
Get the current schema version
§Example
use rusqlite_migration::{Migrations, M, SchemaVersion};
use std::num::NonZeroUsize;
let mut conn = rusqlite::Connection::open_in_memory().unwrap();
let migrations = Migrations::new(vec![
M::up("CREATE TABLE animals (name TEXT);"),
M::up("CREATE TABLE food (name TEXT);"),
]);
assert_eq!(SchemaVersion::NoneSet, migrations.current_version(&conn).unwrap());
// Go to the latest version
migrations.to_latest(&mut conn).unwrap();
assert_eq!(SchemaVersion::Inside(NonZeroUsize::new(2).unwrap()), migrations.current_version(&conn).unwrap());
§Errors
Returns Error::RusqliteError
in case the user version cannot be queried.
sourcepub fn to_latest(&self, conn: &mut Connection) -> Result<()>
pub fn to_latest(&self, conn: &mut Connection) -> Result<()>
Migrate the database to latest schema version. The migrations are applied atomically.
§Example
use rusqlite_migration::{Migrations, M};
let mut conn = rusqlite::Connection::open_in_memory().unwrap();
let migrations = Migrations::new(vec![
M::up("CREATE TABLE animals (name TEXT);"),
M::up("CREATE TABLE food (name TEXT);"),
]);
// Go to the latest version
migrations.to_latest(&mut conn).unwrap();
// You can then insert values in the database
conn.execute("INSERT INTO animals (name) VALUES (?)", ["dog"]).unwrap();
conn.execute("INSERT INTO food (name) VALUES (?)", ["carrot"]).unwrap();
§Errors
Returns Error::MigrationDefinition
if no migration is defined.
sourcepub fn to_version(&self, conn: &mut Connection, version: usize) -> Result<()>
pub fn to_version(&self, conn: &mut Connection, version: usize) -> Result<()>
Migrate the database to a given schema version. The migrations are applied atomically.
§Specifying versions
- Empty database (no migrations run yet) has version
0
. - The version increases after each migration, so after the first migration has run, the schema version is
1
. For instance, if there are 3 migrations, version3
is after all migrations have run.
Note: As a result, the version is the index in the migrations vector starting from 1.
§Example
use rusqlite_migration::{Migrations, M};
let mut conn = rusqlite::Connection::open_in_memory().unwrap();
let migrations = Migrations::new(vec![
// 0: version 0, before having run any migration
M::up("CREATE TABLE animals (name TEXT);").down("DROP TABLE animals;"),
// 1: version 1, after having created the “animals” table
M::up("CREATE TABLE food (name TEXT);").down("DROP TABLE food;"),
// 2: version 2, after having created the food table
]);
migrations.to_latest(&mut conn).unwrap(); // Create all tables
// Go back to version 1, i.e. after running the first migration
migrations.to_version(&mut conn, 1);
conn.execute("INSERT INTO animals (name) VALUES (?)", ["dog"]).unwrap();
conn.execute("INSERT INTO food (name) VALUES (?)", ["carrot"]).unwrap_err();
// Go back to an empty database
migrations.to_version(&mut conn, 0);
conn.execute("INSERT INTO animals (name) VALUES (?)", ["cat"]).unwrap_err();
conn.execute("INSERT INTO food (name) VALUES (?)", ["milk"]).unwrap_err();
§Errors
Attempts to migrate to a higher version than is supported will result in an error.
When migrating downwards, all the reversed migrations must have a .down()
variant,
otherwise no migrations are run and the function returns an error.
sourcepub fn validate(&self) -> Result<()>
pub fn validate(&self) -> Result<()>
Run upward migrations on a temporary in-memory database from first to last, one by one. Convenience method for testing.
§Example
#[cfg(test)]
mod tests {
// … Other tests …
#[test]
fn migrations_test() {
migrations.validate().unwrap();
}
}
§Errors
Returns Error::RusqliteError
if the underlying sqlite database open call fails.
Trait Implementations§
source§impl<'m> Clone for Migrations<'m>
impl<'m> Clone for Migrations<'m>
source§fn clone(&self) -> Migrations<'m>
fn clone(&self) -> Migrations<'m>
1.0.0 · source§fn clone_from(&mut self, source: &Self)
fn clone_from(&mut self, source: &Self)
source
. Read moresource§impl<'m> Debug for Migrations<'m>
impl<'m> Debug for Migrations<'m>
source§impl<'u> FromIterator<M<'u>> for Migrations<'u>
impl<'u> FromIterator<M<'u>> for Migrations<'u>
source§impl<'m> PartialEq for Migrations<'m>
impl<'m> PartialEq for Migrations<'m>
source§fn eq(&self, other: &Migrations<'m>) -> bool
fn eq(&self, other: &Migrations<'m>) -> bool
self
and other
values to be equal, and is used
by ==
.