1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
|
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> {
let version = self.conn.query_row(
"SELECT COALESCE(MAX(version), 0) FROM schema_migrations",
[],
|row| row.get::<_, i32>(0),
)?;
Ok(version)
}
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);
}
}
|
