blob: fdc32d39c4acdbabbfd0205bd4823516434fa1e5 (
plain)
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
|
{-# LANGUAGE OverloadedStrings #-}
{-# LANGUAGE QuasiQuotes #-}
module SpaceTraders.Database
( close
, open
) where
import Control.Exception
import qualified Database.SQLite.Simple as S
import Text.RawString.QQ
migrations :: [S.Query]
migrations = [
[r|CREATE TABLE schema_version (
version INTEGER NOT NULL
);
|],
[r|CREATE TABLE tokens (
id INTEGER PRIMARY KEY,
data TEXT NOT NULL
);
|],
[r|CREATE TABLE agents (
id INTEGER PRIMARY KEY,
data TEXT NOT NULL
);
|],
[r|CREATE TABLE contracts (
id INTEGER PRIMARY KEY,
data TEXT NOT NULL
);
|]]
close :: S.Connection -> IO ()
close conn = S.close conn
open :: IO S.Connection
open = do
conn <- S.open "spacetraders.db"
S.execute_ conn "PRAGMA foreign_keys = ON;"
S.execute_ conn "PRAGMA journal_mode = WAL;"
S.withTransaction conn $ do
version <- getSchemaVersion conn `catch` defaultVersion
mapM_ (S.execute_ conn) $ drop version migrations
S.execute_ conn "DELETE FROM schema_version;"
S.execute conn "INSERT INTO schema_version (version) VALUES (?);" (S.Only $ length migrations)
return conn
getSchemaVersion :: S.Connection -> IO Int
getSchemaVersion conn = do
[[v]] <- S.query_ conn "SELECT version FROM schema_version;"
return v
defaultVersion :: SomeException -> IO Int
defaultVersion _ = return 0
|