Module migration 

Database migration system

Provides a flexible migration framework for evolving projection schemas.

Example

use azoth::prelude::*;
use azoth::{Migration, MigrationManager};
use rusqlite::Connection;

// Define migrations
struct CreateAccountsTable;

impl Migration for CreateAccountsTable {
    fn version(&self) -> u32 {
        2
    }

    fn name(&self) -> &str {
        "create_accounts_table"
    }

    fn up(&self, conn: &Connection) -> Result<()> {
        conn.execute(
            "CREATE TABLE accounts (
                id INTEGER PRIMARY KEY,
                balance INTEGER NOT NULL DEFAULT 0,
                created_at TEXT NOT NULL DEFAULT (datetime('now'))
            )",
            [],
        ).map_err(|e| AzothError::Projection(e.to_string()))?;
        Ok(())
    }

    fn down(&self, conn: &Connection) -> Result<()> {
        conn.execute("DROP TABLE accounts", [])
            .map_err(|e| AzothError::Projection(e.to_string()))?;
        Ok(())
    }
}

// Create manager and register migrations
let mut manager = MigrationManager::new();
manager.add(Box::new(CreateAccountsTable));

// Run migrations
let db = AzothDb::open("./data")?;
manager.run(db.projection())?;

Structs

FileMigration

File-based migration

MigrationHistoryEntry

Migration history entry

MigrationInfo

Migration information

MigrationManager

Migration manager

Traits

Migration

Migration trait