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|
use anyhow::Result;
use rusqlite::Connection;
pub struct Migration {
pub version: i32,
pub name: &'static str,
pub sql: &'static str,
}
const MIGRATIONS: &[Migration] = &[
Migration {
version: 1,
name: "initial_schema",
sql: include_str!("../migrations/001_initial_schema.sql"),
},
// Add more migrations here as needed
// Migration {
// version: 2,
// name: "add_user_table",
// sql: include_str!("../migrations/002_add_user_table.sql"),
// },
];
pub struct MigrationRunner<'a> {
conn: &'a Connection,
}
impl<'a> MigrationRunner<'a> {
pub fn new(conn: &'a Connection) -> Self {
Self { conn }
}
pub fn run_migrations(&self) -> Result<()> {
// Create migrations table if it doesn't exist
self.conn.execute(
"CREATE TABLE IF NOT EXISTS schema_migrations (
version INTEGER PRIMARY KEY,
name TEXT NOT NULL,
applied_at TEXT NOT NULL
)",
[],
)?;
// Get current migration version
let current_version = self.get_current_version()?;
println!("Current database version: {}", current_version);
// Run pending migrations
for migration in MIGRATIONS {
if migration.version > current_version {
println!(
"Running migration {}: {}",
migration.version, migration.name
);
self.run_migration(migration)?;
}
}
println!("All migrations completed successfully");
Ok(())
}
fn get_current_version(&self) -> Result<i32> {
// Check if schema_migrations table exists first
let table_exists = self.conn.query_row(
"SELECT name FROM sqlite_master WHERE type='table' AND name='schema_migrations'",
[],
|_| Ok(()),
);
match table_exists {
Ok(_) => {
// Table exists, get the current version
let version = self.conn.query_row(
"SELECT COALESCE(MAX(version), 0) FROM schema_migrations",
[],
|row| row.get::<_, i32>(0),
)?;
Ok(version)
}
Err(_) => {
// Table doesn't exist, we're at version 0
Ok(0)
}
}
}
fn run_migration(&self, migration: &Migration) -> Result<()> {
// Execute the migration SQL
self.conn.execute_batch(migration.sql)?;
// Record the migration as applied
self.conn.execute(
"INSERT INTO schema_migrations (version, name, applied_at) VALUES (?1, ?2, ?3)",
[
&migration.version.to_string(),
migration.name,
&chrono::Utc::now().to_rfc3339(),
],
)?;
Ok(())
}
pub fn rollback_to_version(&self, target_version: i32) -> Result<()> {
println!("Rolling back to version {}", target_version);
// This is a simplified rollback - in practice you'd need down migrations
// For now, just remove migration records
self.conn.execute(
"DELETE FROM schema_migrations WHERE version > ?1",
[target_version],
)?;
println!("Rollback completed (Note: This doesn't actually undo schema changes)");
Ok(())
}
pub fn show_migration_status(&self) -> Result<()> {
println!("Migration Status:");
println!("================");
let mut stmt = self
.conn
.prepare("SELECT version, name, applied_at FROM schema_migrations ORDER BY version")?;
let migrations = stmt.query_map([], |row| {
Ok((
row.get::<_, i32>(0)?,
row.get::<_, String>(1)?,
row.get::<_, String>(2)?,
))
})?;
for migration in migrations {
let (version, name, applied_at) = migration?;
println!(
"✅ Migration {}: {} (applied: {})",
version, name, applied_at
);
}
// Show pending migrations
let current_version = self.get_current_version()?;
for migration in MIGRATIONS {
if migration.version > current_version {
println!(
"⏳ Migration {}: {} (pending)",
migration.version, migration.name
);
}
}
Ok(())
}
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn test_migration_runner() {
let conn = Connection::open_in_memory().unwrap();
let runner = MigrationRunner::new(&conn);
// Should start with version 0
assert_eq!(runner.get_current_version().unwrap(), 0);
// Run migrations
runner.run_migrations().unwrap();
// Should now be at latest version
assert_eq!(
runner.get_current_version().unwrap(),
MIGRATIONS.len() as i32
);
}
}
|
