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
|
use anyhow::Result;
use rusqlite::{Connection, Transaction, config::DbConfig};
pub const DB_NAME: &str = "database.sqlite";
const DB_VERSION: i64 = 0;
pub struct Database {
conn: Connection,
}
impl Database {
pub fn new(db_file: &str) -> Result<Self> {
let mut init = false;
if !std::fs::exists(db_file)? {
init = true;
}
let mut db = Database {
conn: Connection::open(db_file)?,
};
if init {
db.initialize()?;
}
db.conn.db_config(DbConfig::SQLITE_DBCONFIG_ENABLE_FKEY)?;
Ok(db)
}
fn initialize(&mut self) -> Result<()> {
let tx = self.conn.transaction()?;
let mut q = "CREATE TABLE version (
version INTEGER NOT NULL,
UNIQUE (version))";
tx.execute(q, ())?;
q = "INSERT INTO version VALUES (?)";
tx.execute(q, [&DB_VERSION])?;
q = "CREATE TABLE user (
id INTEGER PRIMARY KEY AUTOINCREMENT,
name TEXT,
email TEXT NOT NULL,
UNIQUE (email))";
tx.execute(q, ())?;
q = "CREATE TABLE list (
id INTEGER PRIMARY KEY AUTOINCREMENT,
name TEXT NOT NULL,
description TEXT,
UNIQUE (name))";
tx.execute(q, ())?;
q = "CREATE TABLE subscription (
user_id INTEGER REFERENCES user (id),
list_id INTEGER REFERENCES list (id),
UNIQUE (user_id, list_id))";
tx.execute(q, ())?;
tx.commit()?;
Ok(())
}
pub fn execute<Ex>(&mut self, q: Ex) -> Result<QueryResult<Ex::T>>
where
Ex: DBExecutable,
{
let tx = self.conn.transaction()?;
let ris = q.execute(&tx)?;
tx.commit()?;
Ok(ris)
}
}
pub trait DBExecutable {
type T;
fn execute(&self, tx: &Transaction) -> Result<QueryResult<Self::T>>;
}
#[derive(Debug)]
pub enum QueryResult<T> {
Empty,
Single(T),
Vec(Vec<T>),
}
|
